CA2231506A1 - Surgical instrument with embedded coding element - Google Patents
Surgical instrument with embedded coding element Download PDFInfo
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- CA2231506A1 CA2231506A1 CA002231506A CA2231506A CA2231506A1 CA 2231506 A1 CA2231506 A1 CA 2231506A1 CA 002231506 A CA002231506 A CA 002231506A CA 2231506 A CA2231506 A CA 2231506A CA 2231506 A1 CA2231506 A1 CA 2231506A1
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- Canada
- Prior art keywords
- coding element
- hub
- hole
- surgical instrument
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320016—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
- A61B17/32002—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes with continuously rotating, oscillating or reciprocating cutting instruments
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00477—Coupling
- A61B2017/00482—Coupling with a code
Abstract
A surgical instrument (10) includes a plastic hub (12) which is received by a handpiece (30) for operating the instrument (10). The plastic hub (12) includes a wall that encloses a passage that receives a surgical tool carrying member, and at least one detectable coding element (24) is embedded at a selected circumferential position in the wall. For example, the coding element (24) is embedded in a hole disposed in the wall. Alternatively, the coding element (24) is molded into the wall during injection molding of the hub. The coding element (24) is for example, a magnet.
Description
W O 97/12~54 PCT~US96/15773 ,S.URGtC~41 INSTRIIMF~T WITH ~MRFD~Ç:D
COCINQ fl FMF~T
Thi~ invention relates to powered surgical Instrument~, such as for arthtoscopy.
Pow~red arthroscopic ~urgical instrurnents typically inelude a stationary outer mcm~er and ~n inn¢r member that is rotated wilhin 10 the ~lJter member by a motorized handpiece. A surgical tool, SUCI1 as a blade, t~on~ a~rading burr, or other 6~itabie cutting impl~.l,cnt, is supported on the distal end of the inn~r m2mber ~nd cuts ti~3ue exposed to It th~ou~h an opening in the tistal end of the outer m~mb~r. The proxlmal end of tne euter member is mounted to a 1~ cyiindricai, hollow hub whlch fits within the handpiece. The cylindrical hub wall ~"~loses a passa~e that rot~tably receives a drive ~haft mounted on the proximal end ot the inner member. The drivc ~llafl: i3 en~agcd by the motor when the hu~ IS inserted into the handpiec~ 3uring operationl tissaJe rldy",~"L~ cut by the r~tatin~
ZO surgical tool ~nd irrig~ting fluid zlrc withdrawn frorn the surglcal slte through the interior of thc inner mernber and throu~h a suction port in the drive shaft by a vacuunl source connected to the handpie~
In arthroscopic surgery, differcnt type6 of instruments operate 25 in differen~ optimal speed ranges. For example, bone-a~r~ding burrs operate at relatively high speeds, while shav~r blade~ perform optimally ~t lower speeds. ~.S. Patent No. 4,705,038 (now Rei~LJe Patent No. Re. 34,5~), entitle~ "Sur~ical Sy~t~m ~or Powered In~trument3," 2~ssigned to the present assignee and incorporated 30 herein by r~fcr~nce (hereinafter referred ~ as the '038 patent), describes ~electively ccding 3uch instruments with coding elements (e ~., magncts~ according to th~ speed range within which the W O 97/12554 2 PCT~US96/lS773 in~trumQnt i~ to oper~tc. For example, a suryical inslrument may ~e coded with zero, one, or t~o magnet~. The magnets ar~ "read" by a set of sensors (such as reed switche~) 3electi~ely positioned in the han~piece to detect the magnetic field~ of the magnets. A motor 5 conu~l unit connected t~ the handp;ece detects thc output~ of the sensors and responds hy setting the motor to the 6peed range that co~l~sponds to the Instrumen~'s code.
The instrun~nts can be ma~netically coded in several way~.
10 For example, in the '038 pal~nt the magnets are lacated either in ;~d~ptcrs which connect the hub of lhe instrument to the handpiece, or in an integral unit made by merging the adapter and the hub.
Alternati~ely, the magnet3 may be disposed in ttl~ hub its~lf. which may be made of pl~stic. For ex~mple, in U.S. Paten~ No. 5.26g.794 1 S issued to Rexroth, the rnagn~ts are po3;tioned in axially-extending.
open-ended reces~s in a fir~t ~nnular pla3tic ~ect~on o~ the hub, and ~ sec~nd annulal~ p~astic hub c~ction is s~cured to the first annular section to ~ se the recesses and hold the ,~agnets therein.
2û Tlli~ inventi~n features numerous ways of embedding a dctectable co~ing element In ttte plastic hu~ of a surgical instrument.
In accordance with the pr~ent inventlon tt-ere is provlded a surgic~l instrument compr;-~ing a hollow outer mern~er having an opening in a di6t31 rcgion thereof hr admitting tissue, an inner memb~r disposed for movemcnt within ~id outer member, ~ distal region o~ said inner m~mber ~upporting a ~urg;c81 tool adjacent to said openin~, a plastic hub mounted to ;I proximal region oF said outer member and inciuding a pass~ge, and at teast one detectable co~ing element embedded a~ a selected circumferantial position in said wall.
Preferred embodiment~ include the following features.
The codin~ ~loment (which is pre~erably a ma~net) rnay be ~mbedded in a hoi~ formed in thc hub wal~. ~he hole m~y be 5 oriented r?~dially or axially with reepect to the longitudin~l axis ~F
hub.
Several technlques for embedding the coding elemcnt are co,~le,~plated. for example~ the coding element can be embedded 10 in the hole br a frictic~n fit with the sides ~f the hole. The hol~ 6ides may incll~de protrusions ~hat are deformed when the coding alom~nt i~ install~d in the hole to assist in the frictlon fit.
Tha coding elcment can bc embedded by displacln~ a re~ion 1~ of the plastic wall adjacent to the hole to tie over at least a po-tion of the codin~ elem~nt. The displ-ced region of plastic may completely coYer the coding element, or not. In the la~ter case, th~ dispiaced re~lon of pla~tic can define a pair of fl~ps eoch of which at least partially c~vers the coding element.
Th-3 coding element can be embedded in the hole by securing a plastic cap ov~r the codin~ element. The hole and the pîa~tic cap ~re configured so thal the cap is tlush with the exterior su~rface of the hub wall adjaccnt to the h~
Adhe6ive may be u~ed to cmbed the coding element in thP
hole. ff the coding element is rece~ed in the hole from the hub's exteri~ r surface, the adhe~ive c;ln bc used to fill the recess.
Another appraach for embedding tha ccding ~lement i~ to mold th~ coding element into the hl~b wali turing injcction molding ~f W O 97J12554 4 PCT~US96/15773 the hub itsclf~ The coding element is held in its selected circumfarenti31 pcsition during at least part of th injection molding proces~. in on~ ernbodimcnt, ttle coding element is held in place until injection mo~ding i~ complete, Qnd then is withdrawn.
5 Alt~rn~tlvely, the coding element is hcld in plaoe until part of ~he coding el~ment has b en cov~red by pl3stic, and then the coding element 15 r~ se~ and the inject;on moiding completed. The laKer techni~ue is partlcularly us~flll if the molded wall of the hub is to completely surround the codin~ element.
The hub m~y be constructed So that up to a selected number of coding element~ correspondin~ to a selecte~ number at circumferen~ial p~5ition5 can be embedded in the hub wa~l. For exampla, a plur~iity of hole3 -- each one of which can, bUt need not, 15 contain a coding elemen~ -- are diQposed at the sel~octed circ~mferential ~osili~n~ in the ~all. Any number of coding com~inations are possible. For ex~mple, all, or less tt~an all, of lhe holes may contaln a cod1ng alement, Alternate1y, of course, the coding elements c~n be rnold~d into the hub at some or all of the 20 sel~cted urcumter~ntlal hub positions. Th~ num~r of cod;ng ~lements provided for a glven surgical instrument, and their rel~tiYe po3itions around the circumference of the hub, determines the "code" of th~ instrument, The hub e~l30:~upports a seal, which helps ;3vo~d ~Jacuum leak~ga beh~aen the hub and a handpiece during operatlon. Jn one ç~mbcdtrnent, th~ ~eal i~ dispos~d on a transve~se suffac~ of the h~b at the prt~ximal end of the hub. In hub configurations in which the codln~ ele",~rl, are embedded in axial holes, the hole-~ may be 3Q ~ ced In the transverse sur~ac~, and may ba covered by the ~eal.
Alternalively, the seal Include~ at l~ast one w;ndow that exposcs a W O 97/12554 PCT~US96/1~773 hole. In another embodiment, the seal is located elsewhere nn the hub, remote from the tran3ver~e surfac~.
Another aspect of the invcntion features a sur~ical ~ystem 5 ~h~t includes the surgic~l instrument and a handpiece adapted to receiv~ the hub of the instrument in a s~ccted orient~tion with respect to th~ selected circumferential position of the coding element. The handpie~e is adapted to move the inner member withirl the outer member to c~use the surgic~l tool to cut tissue 10 admitted tl~rough the openln~ in the outef member. At lea~t one ~ensor is positioned in lhe handplece for d~te~ting whether the coding element i5 present in the hub.
P.~f~r. -d embodiments include th~ following ~eatures.
The cod;ng element may comprise a magnet. In one emhodiment, the sensor i~ a 6witch ~dapted to be closed by the ma~netic field generated by the ma~nct. P~ a result, each s~lect~d circumferen~al posiliol1 of the hub represents one of hvo possible 20 coding states--m~gnPt absent ar~d magnet prescnt. IF1 anothcr ~mbodiment. the sensor is a device th~t can al60 determine the orientation of the magnetic fleld This allows each hub po~ition to also represent coding states corresponding to different magnet;c ficld orientations.
COCINQ fl FMF~T
Thi~ invention relates to powered surgical Instrument~, such as for arthtoscopy.
Pow~red arthroscopic ~urgical instrurnents typically inelude a stationary outer mcm~er and ~n inn¢r member that is rotated wilhin 10 the ~lJter member by a motorized handpiece. A surgical tool, SUCI1 as a blade, t~on~ a~rading burr, or other 6~itabie cutting impl~.l,cnt, is supported on the distal end of the inn~r m2mber ~nd cuts ti~3ue exposed to It th~ou~h an opening in the tistal end of the outer m~mb~r. The proxlmal end of tne euter member is mounted to a 1~ cyiindricai, hollow hub whlch fits within the handpiece. The cylindrical hub wall ~"~loses a passa~e that rot~tably receives a drive ~haft mounted on the proximal end ot the inner member. The drivc ~llafl: i3 en~agcd by the motor when the hu~ IS inserted into the handpiec~ 3uring operationl tissaJe rldy",~"L~ cut by the r~tatin~
ZO surgical tool ~nd irrig~ting fluid zlrc withdrawn frorn the surglcal slte through the interior of thc inner mernber and throu~h a suction port in the drive shaft by a vacuunl source connected to the handpie~
In arthroscopic surgery, differcnt type6 of instruments operate 25 in differen~ optimal speed ranges. For example, bone-a~r~ding burrs operate at relatively high speeds, while shav~r blade~ perform optimally ~t lower speeds. ~.S. Patent No. 4,705,038 (now Rei~LJe Patent No. Re. 34,5~), entitle~ "Sur~ical Sy~t~m ~or Powered In~trument3," 2~ssigned to the present assignee and incorporated 30 herein by r~fcr~nce (hereinafter referred ~ as the '038 patent), describes ~electively ccding 3uch instruments with coding elements (e ~., magncts~ according to th~ speed range within which the W O 97/12554 2 PCT~US96/lS773 in~trumQnt i~ to oper~tc. For example, a suryical inslrument may ~e coded with zero, one, or t~o magnet~. The magnets ar~ "read" by a set of sensors (such as reed switche~) 3electi~ely positioned in the han~piece to detect the magnetic field~ of the magnets. A motor 5 conu~l unit connected t~ the handp;ece detects thc output~ of the sensors and responds hy setting the motor to the 6peed range that co~l~sponds to the Instrumen~'s code.
The instrun~nts can be ma~netically coded in several way~.
10 For example, in the '038 pal~nt the magnets are lacated either in ;~d~ptcrs which connect the hub of lhe instrument to the handpiece, or in an integral unit made by merging the adapter and the hub.
Alternati~ely, the magnet3 may be disposed in ttl~ hub its~lf. which may be made of pl~stic. For ex~mple, in U.S. Paten~ No. 5.26g.794 1 S issued to Rexroth, the rnagn~ts are po3;tioned in axially-extending.
open-ended reces~s in a fir~t ~nnular pla3tic ~ect~on o~ the hub, and ~ sec~nd annulal~ p~astic hub c~ction is s~cured to the first annular section to ~ se the recesses and hold the ,~agnets therein.
2û Tlli~ inventi~n features numerous ways of embedding a dctectable co~ing element In ttte plastic hu~ of a surgical instrument.
In accordance with the pr~ent inventlon tt-ere is provlded a surgic~l instrument compr;-~ing a hollow outer mern~er having an opening in a di6t31 rcgion thereof hr admitting tissue, an inner memb~r disposed for movemcnt within ~id outer member, ~ distal region o~ said inner m~mber ~upporting a ~urg;c81 tool adjacent to said openin~, a plastic hub mounted to ;I proximal region oF said outer member and inciuding a pass~ge, and at teast one detectable co~ing element embedded a~ a selected circumferantial position in said wall.
Preferred embodiment~ include the following features.
The codin~ ~loment (which is pre~erably a ma~net) rnay be ~mbedded in a hoi~ formed in thc hub wal~. ~he hole m~y be 5 oriented r?~dially or axially with reepect to the longitudin~l axis ~F
hub.
Several technlques for embedding the coding elemcnt are co,~le,~plated. for example~ the coding element can be embedded 10 in the hole br a frictic~n fit with the sides ~f the hole. The hol~ 6ides may incll~de protrusions ~hat are deformed when the coding alom~nt i~ install~d in the hole to assist in the frictlon fit.
Tha coding elcment can bc embedded by displacln~ a re~ion 1~ of the plastic wall adjacent to the hole to tie over at least a po-tion of the codin~ elem~nt. The displ-ced region of plastic may completely coYer the coding element, or not. In the la~ter case, th~ dispiaced re~lon of pla~tic can define a pair of fl~ps eoch of which at least partially c~vers the coding element.
Th-3 coding element can be embedded in the hole by securing a plastic cap ov~r the codin~ element. The hole and the pîa~tic cap ~re configured so thal the cap is tlush with the exterior su~rface of the hub wall adjaccnt to the h~
Adhe6ive may be u~ed to cmbed the coding element in thP
hole. ff the coding element is rece~ed in the hole from the hub's exteri~ r surface, the adhe~ive c;ln bc used to fill the recess.
Another appraach for embedding tha ccding ~lement i~ to mold th~ coding element into the hl~b wali turing injcction molding ~f W O 97J12554 4 PCT~US96/15773 the hub itsclf~ The coding element is held in its selected circumfarenti31 pcsition during at least part of th injection molding proces~. in on~ ernbodimcnt, ttle coding element is held in place until injection mo~ding i~ complete, Qnd then is withdrawn.
5 Alt~rn~tlvely, the coding element is hcld in plaoe until part of ~he coding el~ment has b en cov~red by pl3stic, and then the coding element 15 r~ se~ and the inject;on moiding completed. The laKer techni~ue is partlcularly us~flll if the molded wall of the hub is to completely surround the codin~ element.
The hub m~y be constructed So that up to a selected number of coding element~ correspondin~ to a selecte~ number at circumferen~ial p~5ition5 can be embedded in the hub wa~l. For exampla, a plur~iity of hole3 -- each one of which can, bUt need not, 15 contain a coding elemen~ -- are diQposed at the sel~octed circ~mferential ~osili~n~ in the ~all. Any number of coding com~inations are possible. For ex~mple, all, or less tt~an all, of lhe holes may contaln a cod1ng alement, Alternate1y, of course, the coding elements c~n be rnold~d into the hub at some or all of the 20 sel~cted urcumter~ntlal hub positions. Th~ num~r of cod;ng ~lements provided for a glven surgical instrument, and their rel~tiYe po3itions around the circumference of the hub, determines the "code" of th~ instrument, The hub e~l30:~upports a seal, which helps ;3vo~d ~Jacuum leak~ga beh~aen the hub and a handpiece during operatlon. Jn one ç~mbcdtrnent, th~ ~eal i~ dispos~d on a transve~se suffac~ of the h~b at the prt~ximal end of the hub. In hub configurations in which the codln~ ele",~rl, are embedded in axial holes, the hole-~ may be 3Q ~ ced In the transverse sur~ac~, and may ba covered by the ~eal.
Alternalively, the seal Include~ at l~ast one w;ndow that exposcs a W O 97/12554 PCT~US96/1~773 hole. In another embodiment, the seal is located elsewhere nn the hub, remote from the tran3ver~e surfac~.
Another aspect of the invcntion features a sur~ical ~ystem 5 ~h~t includes the surgic~l instrument and a handpiece adapted to receiv~ the hub of the instrument in a s~ccted orient~tion with respect to th~ selected circumferential position of the coding element. The handpie~e is adapted to move the inner member withirl the outer member to c~use the surgic~l tool to cut tissue 10 admitted tl~rough the openln~ in the outef member. At lea~t one ~ensor is positioned in lhe handplece for d~te~ting whether the coding element i5 present in the hub.
P.~f~r. -d embodiments include th~ following ~eatures.
The cod;ng element may comprise a magnet. In one emhodiment, the sensor i~ a 6witch ~dapted to be closed by the ma~netic field generated by the ma~nct. P~ a result, each s~lect~d circumferen~al posiliol1 of the hub represents one of hvo possible 20 coding states--m~gnPt absent ar~d magnet prescnt. IF1 anothcr ~mbodiment. the sensor is a device th~t can al60 determine the orientation of the magnetic fleld This allows each hub po~ition to also represent coding states corresponding to different magnet;c ficld orientations.
2~
The handpicce include~ a motor for ro~ating thç~ Inner member with~n the outer member. A controller responds to ltle detectlon provided by the sensor by ~djusting an operatfng param~tel ~f the motor. For ex~mple. the controller adjusts the motor ~peed ran~e 30 ~ccording to the l'ccde" detected by the sen~or.
W O 97/12554 PCT~US96/15773 Emb~ddin~ the magnets in the ~all or ~he hub itself allows the rnagnet~ to be positioned clo~ely to th~ exterior ~urface ~ the hùb.
thereby raducing the spacin~ between the magnets and ~ensors.
Thi~ reduces th~ magnet~' requir~d magnetic field stren~th, ~nd lead~ to a more economicat de6ign /~t lea~t in ~ome embodimen~s, the m~net~ ~re accessi~l~ for claaning andlor replacement, if desired. Some embodiments also c~rry the additional advanta~e of elinlinatlng components th~t were previously u~ed to help capture the magrl~ts in the hub.
Other featur~s and advant~ges will become apparent frorn thc follow~ng det3iled description, ~nd from the claims.
F;g. 1 ~hows a ~urgical in~trument with embedded magnets and a handpi~ce.
Fi~. 2 is a per6p~3ctive vi~w ~f the hub of the surgical instrument of Fig. 1.
Fig. 3 ill~l,dtes one techni~ue for embcdding a magnct in the hub of the sur~ical instrument of Fi~. 1.
Figs, 3A-3D show alternative ways of embedding th~ magnet in the hub.
Figs. 4-11 illustrate se~eral other alternative technique~ for em~cdding a magnet in a sur~lcal Instrurnent hub.
Figs. ~2 and 13 show alternatlYe arran~ements of a seal on the surgic~I in~trument hub.
Fig~, 14-16 illu~trate molding a ma~ne~ into a wall of a surgiral instrument hub.
Refemng to F;g. 1, surgicat ;n6trument 10 ineludes a cylindrlGal plastic hub 12 to which the proximal end of an elongated ou~r tube 14 is mounted. An elon~ated inner tube 16 i~ disposcd W O 97/12554 PCTrUS96/15773 for rotation within oute- hlbe 14 ~tlJbes 14. 1 G ~ypically ~re metal). A
plastic driv~ shaft 18 i~ mountcd to the proximai end of inner lube 16 and is rotatably receiv~d within a passage 20 in hub 12. At the distal end 22 ~f instrument ~0 (shown sch~ma~ically in ~ig. 1) a 5 cuttin~ implement ~such as a blade or burr) carri~d at the distal end of Inner tube 16 cuts tissue exposed thereto by ~n opcning in outer tub~ 14 ~the openin~ is, for example, a sida-hcin~ window or an open end of tube 14).
Vp to f~ur magnf~ls 24 (three o~ which are shown in Fig. 1) are embedded ~Yithin the cylh1dlic~1 watl 26 o~ plastlc hl~b 1~ that enclosc~ pQ33age 20, nea~ the proxi~ end 28 of hub 1 Z. Magnets 24 serve ;~5 coding element~ that identify the type of surglcal instrum~nt to a motoriz~d handpiece 3Q that operaLes instrument 10, 15 as described below. ~la~nets 24 Qre located at selective po~itions around the eircumference of hub 12 so that, when hub 12 is installed Into a cylindrical cham~er 32 in handpiece 30, magnet3 24 are p~sltloned ~ cent to a set o~ sensors 34 mount~d in the walls of handpie~P 3~. ~Oniy two sens~rs 34 ar~ shswn in Fig. 1, but it will 20 be appreciated that, be~ instrument ~0 can contain up to four magnets, four sensors 34 are dispesed arotund the periphery of chamber 32~) Sensor~ 34 can ~e any suita~le devices for d~le;cling the presence (or absence) of ma~nets 24. For example, eensots 34 msy be ~lall effect devices, which in addi~ion ~o detecting 2~ whether ~ ma~net 24 i~ present can z~lso d~rmine the orlentation of the magnetic field prcduced by magnet 24. Alten1atiY~ly, sensors ~4 may be reed switches.
Handpiece 3() includes a motor 36 the drive shaft 38 of which 30 r~tatably engageS Instrurnent ~rive shaK 18 when surgical instrument 10 is inserted in chamber 32. IAotor 36 is controlled by a W O 97/12554 PCT~US96/15773 controllcr 40, which i5 connected by a cable 42 to handpiece ~.
C~lc 42 81so carrie~ signals from sensol~ 34 to controller 40 for procQ~ing. Onc e%Qmple of controller 40 is di~cussed in the 'û38 patent.
Keferring to F;g~. 2 and 3, hub 12 and the configurat;on of embedded magnets 24 are shown in more d~tail. Hub 1~ is a one-piece plastic. cylindrical member ~ormed by injection molding. One or more holes 50, eaoh of which can contain on~ m~gn¢t, are 10 forrned are radially (relative to the longitudinal axi~ 15 of hub 12) in the plastic cylindrical wall 26 of hub 12. t~adially-extending hole6 50 are located at sel~çte~ positions araun~ the ~Ircumference of hub 12 rel~tive to a plastic locator s~ub 13 formed on the o~Jter surface of hvb 12 during injection molding. Hol~ 24 can be elther be f~rmed 15 during the injcction molding proc~ss ~r thel~fter (such as by driliing). In aither C3SC, cylindricai wall 2G is sufficiently thick relatlve to the size magnet~ 24 to securely embed magne~s 24 ther~in. For example, the thickness of wall 26 may be such that Q.9mm -1mm (0.Q35-~.D~0 inches) or less of pla~tic. or 1.6mm - 2.6mm ~0.0~5-2Q 0.070 Inches~ or more of plastic, are pra~ent on e~ch radi~f 3ide ofrnagnet 24 (whlch ha~ ~ dirnension in fhe radial direction of, e.g., beiween 1.6mm - 2.6mm (0.065-0.100 inches~, Of cour~e, magnet3 24 need not be radla11y centered withln wall 2~. Hole~ ~0 are ~paced fr~m passage 20 by a portion of wall 26 to isolate magn~ts 26 24 from fluids and tissue fr~ments withdraYJn through inner tube 16 (but holcs 50 may intersect p~ssage 20. if desired~.
Each magnet 24 is a smail cylinder, the dlameter c~f which dosely approximates that of hole ~0. ~1~gnet 24 i5 installed radially 30 so that its cylindrical sides ar~ pre~s-fit into holc 50. A3 a result, the flat faces ot ma~net 2~ ~and hence the "north" (N~ and "south" (S) CA 0223l506 l998-03-30 W O 97/12554 ~ PCT~US96/15773 poles of magnet '24) are arr3nged radia~ly, rather than circum~erentially around hub 12. If reed switche3 are used as sensor~ 34, the relative orienhtions of the north and ~outh ma~net poles in hole 5(1 ~re unimport~nt. But if Hall effect devic¢s (which 5 detect the ol lenlation ~ f tl~e m~gnetic field a~. well a~ the prc~ence or -~bs~:nc~ of a ma~net 24) are used, the orien~ation of ma~net 24 in hole ~0 provides ~n a~ltlonal codin9 indicati~n and thu~ mu~t be selected accordingly.
The friction fit with the sidew~lls of h~le SQ ~umces tO embed magnet 24 in pl~ce within cylin~ir;cal wall 2~. Bult to provlde additional 6ecurity, one or more regions 52 of the sidewalls of hole ~0 are displaced or "st3ked" over mssnet 24. "Staking" involves heating the plastic siciewall& 6uffici~ntly to melt sidewall regions 52, 15 while ~imultaneously urging region~ ~2 downwardly against the flat upper surface of magnet 24.
A ring-shaped silicone seal 60 i~ installed on a tran~verse annu~ urfaoe 51 ~t hUb proYimal end 28, and is axi~lly ~paced 20 from magnet-con~aining holes 24 by an integral flange 27 of hub cylindrical wall 26. Seal B0 surrounds 3 collar 62 molded integrally at the proximal end of hub 12, and is held in place ~y a pair of ta~s 64 (Fig 3) that extend in~o cGr,es~conding openings in collar ~2.
S~al 60 proYides a Y~cuum-tight fit oetween hub 12 ~nd ~?andplece 25 30, which pravent~ le~k~gc of 3uction applied (by means nc~t shown) to the surgical SitQ through the instrument to a3pirate fluids and tissue. In addition, tabs 62 ~ngaga inner tubc drive 3haft 18 to help preYent inner tube 1~ from siiding out of hub 12 (tab6 62 can be o~rrome manu211y by pullin~ inn~r tube 16 proxim~lly out of hub 30 ~ 2).
W O 97/12554 PCT~US96/15773 R~:ferring ~g~in to Fig. 1 the operation of the system is as follo~s~ When an instrument 10 is inserted into han~piece 30 stub 13 en3ure~ that hub 12 is orieJlt~d within chamber 32 so that any m3gncts 24 ccrried ~y hub 12 are position~d adjacent to sensors 34. E3ch een- or 34 detects whether a magnet 24 i~ present and communicates this inforrnation to con~roll~r 40 Y;a cable 42. For example, i~ sensors 34 aro reed switches, those reed s~;leh~s positloned adjacent to a magnet 24 Qre closed by the m~gnet's ma~netic f~eld while the other reed ~witches rcm~in in the open"
t O state. Thus each ma~net position in hub 12 can haYc one of two coding states -- ma5net present and magnet ab~ent. The position of each ~ed switch. and hence the "code ~r the particuiar in~trument 10 is determined t~y controller 40 1~ if ~n~ol~ 34 are Hall effect devices they addltionally detect the oricn~ation of the magnetic field produ~;ed by each mi~net 24 in hub 12. Put another way, when l lall effiect devic~ are used as sensors 34 each m~gnet position in hub 12 can have any of thre~
coding states--magnet ab6ent magnet pre~ent with north (N) pole facin~ radially outwardly (a~ shown in Fig. 3)1 and m~gnet prcsent with south (~i~ pole facing radially outwardly. Thc state of e~ch Hzll effect sensor ~and hence the code" for the particultr instrument 10) is deterrnlned by contrnller 40.
2~ ~hus. it will be appreclated that wide vanety of instrument codes are possible. As ~ result a manufacturer can s~bdtvide a ho~t of 3urg;cal instruments ~0 inlo a correspondlngly lar~e numh~r of differcnt "type3 " each of which is unique~y coded by em~edded ma~nets 24. C~"troll~r 40 is programmed to ~soci~te ~ach possible instrument code (3nd thus e~ch type of instrument 10) wil~
a set of operating conditions that are opt,l~lal for th~t type o~
W O 97112554 PCTrUS96/15773 trument. For exarnple. controller ~0 can set the operatin~ ~pe~d ran~ of mt~t~r 30. the maximum torque provided by rnotor 30, and any other parameter of n)otor 30, all base~ ~n the in~mlment's code.
In addition, controller 40 can ad~ust ~ther operatln~ parameters b~sed on the code provided by embe~ded magnets Z4. Examples includc the maximum torque applied by m~ r 30. the permltted modes of op~ration of motor 30 (e.g., whether nlot~r ~0 is per~r~ ed t~ opGrate in the rc~crse direction~ or to oscil~t~ betw~en the fo~vard and reve-6e directions), and the ~pcr~tion of peripheral 10 components (such ac the ~acuum devices u~ed to aspirate irrigation fluids and t;ssue from the ~urgical site).
Other embodiments are within the ~cope of the following claims.
~ or examp~e. ma~nets 24 ~n ~e embedded within holas 5 7n other ways. As mentioned above the magnets may simply ~e ~ embedded in place by ~riction. Adheslve (for eYample, a heat or ultra~iolet-light curin~ epo~y may be use~ Inste~d of ~or in ~ddition 2û to~ 3taking.
Referring to Fig. 3A, yet another embeddin~ op~ton is to coYer each magnet 24 with a round plastic cap 66. Cap GG may b~ glued or staked in place ant pre~erably fills the small indent 51 ~isa. 3) ;~5 between the uppar ~urface of m~gnct 24 and the exterior sur~ace~ of hub w~l 26. Plastic caps 66 will prev~nt fiqu;d and particles ~rom accl~mulating on the upper surf~ces of magnet~ 24, in 3ddition to - proYldin~ a pleasin~ pear~nee (e.g., caps 66 ~nd hub 12 m3y be Inade from the same color plastic). As an altemative, the uppQr 3~ surface (or all surfaces) of magnets 24 may be coated with plastic.
W O 97/125~4 12 PCTAUS96/15773 F~eferrin~ to Fig. 3B, an altern~ive plastic cap 68 is larger in diameter than magnet 24 and includes a set of (e.g., three or four~
legs 70 arranged arQund the circum~3rence of magnet 2~ and extendiny along the sides of magnet Z4. Hole 50' i5 l~r~3er than 5 magnet 24 to aoc;~.."--,.Jate legc 70, which may extend the full depth of hoie 50' or (as shown) termina~e above the base of hole ~iO'. Legs 70 are secured to the sides of hole 50' by a frictian fit, gluing, o~ staking.
During manufacturing, a large number ~f legç~ed caps 68 may be faL,r;cate~ as a strip of interconnected caps 68, each of which is filled with a magnet 24. The magnet-cont;~ining caps 68 can be empl~ced in hubs t~y an a~,L~ d ~ro~s, thereby ~i."~ ring and speeding the fab~ process. Rather than having a discrete set 15 of legs, cap 68 may i. ,st~ include a cylindrical sleeve that hllly surrounds magnet 24.
The small ~ndent ~1 beh~/een the upper ~urface of rnagnet 24 and the exterior of hub cylindncai ~1126 may be reduced from that 20 shown in Fig. 3 or may be eliminated altogether (e.ç~., by reducinsl the depth of holes ~0 so that ma~nets 24 are essentially '~lush" with the e~ri~r surfac~ of hub wall 26. This will help ensure that indents 51 do not ir~ n: with the operation of mechanical "ball locks" in handpiece 30. (A ba\l lock i~ a spring-mounted ball bearjng that 25 e~"~s into hub-receiving chamber 32 for securing hub 12 within handpiece 30 ~uring operation. The user retrac~s the balls (by a mechanism not shown) when installing hub 1~ into and removing hub 12 ~rom handpiece 30. When instrument 10 is ~ul~y inserted, the balls ex~end into a circ~-mferential groove 11 in hub 12 (Fig. 2) to 30 latch hub 12 in pl~ce in the handpiece.) W O 97/12554 PCT~US96/15773 Referring to Figs. 3C and 3D, small groov~s 72 may be provided in the e~t~lior surface of h~-b wail 26 a~jacent to holes 50.
Grooves 7Z wili allo~ ~he b~li locks to smoothly bypass holes 50.
Magnets 24 may be emh~e~l in hub cylindrical wal1s 26 in still other ways. For exarr~pie, re~erring to figs. 4-7 in Ins~rurnent 100, m~gnet-containing holes 102 are di~ axiall~ ~Ic~ng axis 1~i of hub 106 (rather than radially). IUagnets 24 are in~ d ;n axi~lly-extending hoies 1C)Z in the cylin~fli.dl walls 10~ of one-,c~iece plastic hLIb 106. ~rhe inner tube and drive shaft o~ instrument 100 are not shown.) Holes 102 are ~pen at an annular surface 101 of cylindrical wall 104 nearthe prox,.,.al end of l-ub 106 to allow magnets 24 to be tnserted in the axial dii~cliurl (one magnet 24 i5 shown in Fig. 6) E~ach hole 102 includes a lower ~,l .a. "l,er 103 that is sliglltly wider than thl3 diame~er of nlagnet 24. A set of ;"~ral cn~sh ribs 108 are ~ormed during molding and protrude into ~ .Ler 103 from opposite sides thereof (Fi~. 6). The spacing be~een opposing crush ribs 108 is less than the diameter of ,.,a~n~t 24 Thus, when magnet 24 is inserted into hofe 102 (as shown by the arrow in Fig. 6), the c:ylindrical sides of magnet 24 engage and de~orm crusll ribs 108.
De:ru~ d crush rlbs 108 sealrely embed magnet 24 in hole 102.
N~.L~ s~, to further embed magnets 24 each ,-,a~n--t-~~ontaining hole 102 is also cl~s~ dunng f~.i.,d~iGn by forming an integral plastic shell 11Q oYer magnet 24 (Fig. 7). Shell 110 is folmed by ..-~ a regions of the sidewalls of hol~ 102 and urging the melted pfastic to~ether over magnet 24 to completefy cover magnet 24 and close hole 102--fully encapsulating magnet 24 u~ithin hùb 106.
The handpicce include~ a motor for ro~ating thç~ Inner member with~n the outer member. A controller responds to ltle detectlon provided by the sensor by ~djusting an operatfng param~tel ~f the motor. For ex~mple. the controller adjusts the motor ~peed ran~e 30 ~ccording to the l'ccde" detected by the sen~or.
W O 97/12554 PCT~US96/15773 Emb~ddin~ the magnets in the ~all or ~he hub itself allows the rnagnet~ to be positioned clo~ely to th~ exterior ~urface ~ the hùb.
thereby raducing the spacin~ between the magnets and ~ensors.
Thi~ reduces th~ magnet~' requir~d magnetic field stren~th, ~nd lead~ to a more economicat de6ign /~t lea~t in ~ome embodimen~s, the m~net~ ~re accessi~l~ for claaning andlor replacement, if desired. Some embodiments also c~rry the additional advanta~e of elinlinatlng components th~t were previously u~ed to help capture the magrl~ts in the hub.
Other featur~s and advant~ges will become apparent frorn thc follow~ng det3iled description, ~nd from the claims.
F;g. 1 ~hows a ~urgical in~trument with embedded magnets and a handpi~ce.
Fi~. 2 is a per6p~3ctive vi~w ~f the hub of the surgical instrument of Fig. 1.
Fig. 3 ill~l,dtes one techni~ue for embcdding a magnct in the hub of the sur~ical instrument of Fi~. 1.
Figs, 3A-3D show alternative ways of embedding th~ magnet in the hub.
Figs. 4-11 illustrate se~eral other alternative technique~ for em~cdding a magnet in a sur~lcal Instrurnent hub.
Figs. ~2 and 13 show alternatlYe arran~ements of a seal on the surgic~I in~trument hub.
Fig~, 14-16 illu~trate molding a ma~ne~ into a wall of a surgiral instrument hub.
Refemng to F;g. 1, surgicat ;n6trument 10 ineludes a cylindrlGal plastic hub 12 to which the proximal end of an elongated ou~r tube 14 is mounted. An elon~ated inner tube 16 i~ disposcd W O 97/12554 PCTrUS96/15773 for rotation within oute- hlbe 14 ~tlJbes 14. 1 G ~ypically ~re metal). A
plastic driv~ shaft 18 i~ mountcd to the proximai end of inner lube 16 and is rotatably receiv~d within a passage 20 in hub 12. At the distal end 22 ~f instrument ~0 (shown sch~ma~ically in ~ig. 1) a 5 cuttin~ implement ~such as a blade or burr) carri~d at the distal end of Inner tube 16 cuts tissue exposed thereto by ~n opcning in outer tub~ 14 ~the openin~ is, for example, a sida-hcin~ window or an open end of tube 14).
Vp to f~ur magnf~ls 24 (three o~ which are shown in Fig. 1) are embedded ~Yithin the cylh1dlic~1 watl 26 o~ plastlc hl~b 1~ that enclosc~ pQ33age 20, nea~ the proxi~ end 28 of hub 1 Z. Magnets 24 serve ;~5 coding element~ that identify the type of surglcal instrum~nt to a motoriz~d handpiece 3Q that operaLes instrument 10, 15 as described below. ~la~nets 24 Qre located at selective po~itions around the eircumference of hub 12 so that, when hub 12 is installed Into a cylindrical cham~er 32 in handpiece 30, magnet3 24 are p~sltloned ~ cent to a set o~ sensors 34 mount~d in the walls of handpie~P 3~. ~Oniy two sens~rs 34 ar~ shswn in Fig. 1, but it will 20 be appreciated that, be~ instrument ~0 can contain up to four magnets, four sensors 34 are dispesed arotund the periphery of chamber 32~) Sensor~ 34 can ~e any suita~le devices for d~le;cling the presence (or absence) of ma~nets 24. For example, eensots 34 msy be ~lall effect devices, which in addi~ion ~o detecting 2~ whether ~ ma~net 24 i~ present can z~lso d~rmine the orlentation of the magnetic field prcduced by magnet 24. Alten1atiY~ly, sensors ~4 may be reed switches.
Handpiece 3() includes a motor 36 the drive shaft 38 of which 30 r~tatably engageS Instrurnent ~rive shaK 18 when surgical instrument 10 is inserted in chamber 32. IAotor 36 is controlled by a W O 97/12554 PCT~US96/15773 controllcr 40, which i5 connected by a cable 42 to handpiece ~.
C~lc 42 81so carrie~ signals from sensol~ 34 to controller 40 for procQ~ing. Onc e%Qmple of controller 40 is di~cussed in the 'û38 patent.
Keferring to F;g~. 2 and 3, hub 12 and the configurat;on of embedded magnets 24 are shown in more d~tail. Hub 1~ is a one-piece plastic. cylindrical member ~ormed by injection molding. One or more holes 50, eaoh of which can contain on~ m~gn¢t, are 10 forrned are radially (relative to the longitudinal axi~ 15 of hub 12) in the plastic cylindrical wall 26 of hub 12. t~adially-extending hole6 50 are located at sel~çte~ positions araun~ the ~Ircumference of hub 12 rel~tive to a plastic locator s~ub 13 formed on the o~Jter surface of hvb 12 during injection molding. Hol~ 24 can be elther be f~rmed 15 during the injcction molding proc~ss ~r thel~fter (such as by driliing). In aither C3SC, cylindricai wall 2G is sufficiently thick relatlve to the size magnet~ 24 to securely embed magne~s 24 ther~in. For example, the thickness of wall 26 may be such that Q.9mm -1mm (0.Q35-~.D~0 inches) or less of pla~tic. or 1.6mm - 2.6mm ~0.0~5-2Q 0.070 Inches~ or more of plastic, are pra~ent on e~ch radi~f 3ide ofrnagnet 24 (whlch ha~ ~ dirnension in fhe radial direction of, e.g., beiween 1.6mm - 2.6mm (0.065-0.100 inches~, Of cour~e, magnet3 24 need not be radla11y centered withln wall 2~. Hole~ ~0 are ~paced fr~m passage 20 by a portion of wall 26 to isolate magn~ts 26 24 from fluids and tissue fr~ments withdraYJn through inner tube 16 (but holcs 50 may intersect p~ssage 20. if desired~.
Each magnet 24 is a smail cylinder, the dlameter c~f which dosely approximates that of hole ~0. ~1~gnet 24 i5 installed radially 30 so that its cylindrical sides ar~ pre~s-fit into holc 50. A3 a result, the flat faces ot ma~net 2~ ~and hence the "north" (N~ and "south" (S) CA 0223l506 l998-03-30 W O 97/12554 ~ PCT~US96/15773 poles of magnet '24) are arr3nged radia~ly, rather than circum~erentially around hub 12. If reed switche3 are used as sensor~ 34, the relative orienhtions of the north and ~outh ma~net poles in hole 5(1 ~re unimport~nt. But if Hall effect devic¢s (which 5 detect the ol lenlation ~ f tl~e m~gnetic field a~. well a~ the prc~ence or -~bs~:nc~ of a ma~net 24) are used, the orien~ation of ma~net 24 in hole ~0 provides ~n a~ltlonal codin9 indicati~n and thu~ mu~t be selected accordingly.
The friction fit with the sidew~lls of h~le SQ ~umces tO embed magnet 24 in pl~ce within cylin~ir;cal wall 2~. Bult to provlde additional 6ecurity, one or more regions 52 of the sidewalls of hole ~0 are displaced or "st3ked" over mssnet 24. "Staking" involves heating the plastic siciewall& 6uffici~ntly to melt sidewall regions 52, 15 while ~imultaneously urging region~ ~2 downwardly against the flat upper surface of magnet 24.
A ring-shaped silicone seal 60 i~ installed on a tran~verse annu~ urfaoe 51 ~t hUb proYimal end 28, and is axi~lly ~paced 20 from magnet-con~aining holes 24 by an integral flange 27 of hub cylindrical wall 26. Seal B0 surrounds 3 collar 62 molded integrally at the proximal end of hub 12, and is held in place ~y a pair of ta~s 64 (Fig 3) that extend in~o cGr,es~conding openings in collar ~2.
S~al 60 proYides a Y~cuum-tight fit oetween hub 12 ~nd ~?andplece 25 30, which pravent~ le~k~gc of 3uction applied (by means nc~t shown) to the surgical SitQ through the instrument to a3pirate fluids and tissue. In addition, tabs 62 ~ngaga inner tubc drive 3haft 18 to help preYent inner tube 1~ from siiding out of hub 12 (tab6 62 can be o~rrome manu211y by pullin~ inn~r tube 16 proxim~lly out of hub 30 ~ 2).
W O 97/12554 PCT~US96/15773 R~:ferring ~g~in to Fig. 1 the operation of the system is as follo~s~ When an instrument 10 is inserted into han~piece 30 stub 13 en3ure~ that hub 12 is orieJlt~d within chamber 32 so that any m3gncts 24 ccrried ~y hub 12 are position~d adjacent to sensors 34. E3ch een- or 34 detects whether a magnet 24 i~ present and communicates this inforrnation to con~roll~r 40 Y;a cable 42. For example, i~ sensors 34 aro reed switches, those reed s~;leh~s positloned adjacent to a magnet 24 Qre closed by the m~gnet's ma~netic f~eld while the other reed ~witches rcm~in in the open"
t O state. Thus each ma~net position in hub 12 can haYc one of two coding states -- ma5net present and magnet ab~ent. The position of each ~ed switch. and hence the "code ~r the particuiar in~trument 10 is determined t~y controller 40 1~ if ~n~ol~ 34 are Hall effect devices they addltionally detect the oricn~ation of the magnetic field produ~;ed by each mi~net 24 in hub 12. Put another way, when l lall effiect devic~ are used as sensors 34 each m~gnet position in hub 12 can have any of thre~
coding states--magnet ab6ent magnet pre~ent with north (N) pole facin~ radially outwardly (a~ shown in Fig. 3)1 and m~gnet prcsent with south (~i~ pole facing radially outwardly. Thc state of e~ch Hzll effect sensor ~and hence the code" for the particultr instrument 10) is deterrnlned by contrnller 40.
2~ ~hus. it will be appreclated that wide vanety of instrument codes are possible. As ~ result a manufacturer can s~bdtvide a ho~t of 3urg;cal instruments ~0 inlo a correspondlngly lar~e numh~r of differcnt "type3 " each of which is unique~y coded by em~edded ma~nets 24. C~"troll~r 40 is programmed to ~soci~te ~ach possible instrument code (3nd thus e~ch type of instrument 10) wil~
a set of operating conditions that are opt,l~lal for th~t type o~
W O 97112554 PCTrUS96/15773 trument. For exarnple. controller ~0 can set the operatin~ ~pe~d ran~ of mt~t~r 30. the maximum torque provided by rnotor 30, and any other parameter of n)otor 30, all base~ ~n the in~mlment's code.
In addition, controller 40 can ad~ust ~ther operatln~ parameters b~sed on the code provided by embe~ded magnets Z4. Examples includc the maximum torque applied by m~ r 30. the permltted modes of op~ration of motor 30 (e.g., whether nlot~r ~0 is per~r~ ed t~ opGrate in the rc~crse direction~ or to oscil~t~ betw~en the fo~vard and reve-6e directions), and the ~pcr~tion of peripheral 10 components (such ac the ~acuum devices u~ed to aspirate irrigation fluids and t;ssue from the ~urgical site).
Other embodiments are within the ~cope of the following claims.
~ or examp~e. ma~nets 24 ~n ~e embedded within holas 5 7n other ways. As mentioned above the magnets may simply ~e ~ embedded in place by ~riction. Adheslve (for eYample, a heat or ultra~iolet-light curin~ epo~y may be use~ Inste~d of ~or in ~ddition 2û to~ 3taking.
Referring to Fig. 3A, yet another embeddin~ op~ton is to coYer each magnet 24 with a round plastic cap 66. Cap GG may b~ glued or staked in place ant pre~erably fills the small indent 51 ~isa. 3) ;~5 between the uppar ~urface of m~gnct 24 and the exterior sur~ace~ of hub w~l 26. Plastic caps 66 will prev~nt fiqu;d and particles ~rom accl~mulating on the upper surf~ces of magnet~ 24, in 3ddition to - proYldin~ a pleasin~ pear~nee (e.g., caps 66 ~nd hub 12 m3y be Inade from the same color plastic). As an altemative, the uppQr 3~ surface (or all surfaces) of magnets 24 may be coated with plastic.
W O 97/125~4 12 PCTAUS96/15773 F~eferrin~ to Fig. 3B, an altern~ive plastic cap 68 is larger in diameter than magnet 24 and includes a set of (e.g., three or four~
legs 70 arranged arQund the circum~3rence of magnet 2~ and extendiny along the sides of magnet Z4. Hole 50' i5 l~r~3er than 5 magnet 24 to aoc;~.."--,.Jate legc 70, which may extend the full depth of hoie 50' or (as shown) termina~e above the base of hole ~iO'. Legs 70 are secured to the sides of hole 50' by a frictian fit, gluing, o~ staking.
During manufacturing, a large number ~f legç~ed caps 68 may be faL,r;cate~ as a strip of interconnected caps 68, each of which is filled with a magnet 24. The magnet-cont;~ining caps 68 can be empl~ced in hubs t~y an a~,L~ d ~ro~s, thereby ~i."~ ring and speeding the fab~ process. Rather than having a discrete set 15 of legs, cap 68 may i. ,st~ include a cylindrical sleeve that hllly surrounds magnet 24.
The small ~ndent ~1 beh~/een the upper ~urface of rnagnet 24 and the exterior of hub cylindncai ~1126 may be reduced from that 20 shown in Fig. 3 or may be eliminated altogether (e.ç~., by reducinsl the depth of holes ~0 so that ma~nets 24 are essentially '~lush" with the e~ri~r surfac~ of hub wall 26. This will help ensure that indents 51 do not ir~ n: with the operation of mechanical "ball locks" in handpiece 30. (A ba\l lock i~ a spring-mounted ball bearjng that 25 e~"~s into hub-receiving chamber 32 for securing hub 12 within handpiece 30 ~uring operation. The user retrac~s the balls (by a mechanism not shown) when installing hub 1~ into and removing hub 12 ~rom handpiece 30. When instrument 10 is ~ul~y inserted, the balls ex~end into a circ~-mferential groove 11 in hub 12 (Fig. 2) to 30 latch hub 12 in pl~ce in the handpiece.) W O 97/12554 PCT~US96/15773 Referring to Figs. 3C and 3D, small groov~s 72 may be provided in the e~t~lior surface of h~-b wail 26 a~jacent to holes 50.
Grooves 7Z wili allo~ ~he b~li locks to smoothly bypass holes 50.
Magnets 24 may be emh~e~l in hub cylindrical wal1s 26 in still other ways. For exarr~pie, re~erring to figs. 4-7 in Ins~rurnent 100, m~gnet-containing holes 102 are di~ axiall~ ~Ic~ng axis 1~i of hub 106 (rather than radially). IUagnets 24 are in~ d ;n axi~lly-extending hoies 1C)Z in the cylin~fli.dl walls 10~ of one-,c~iece plastic hLIb 106. ~rhe inner tube and drive shaft o~ instrument 100 are not shown.) Holes 102 are ~pen at an annular surface 101 of cylindrical wall 104 nearthe prox,.,.al end of l-ub 106 to allow magnets 24 to be tnserted in the axial dii~cliurl (one magnet 24 i5 shown in Fig. 6) E~ach hole 102 includes a lower ~,l .a. "l,er 103 that is sliglltly wider than thl3 diame~er of nlagnet 24. A set of ;"~ral cn~sh ribs 108 are ~ormed during molding and protrude into ~ .Ler 103 from opposite sides thereof (Fi~. 6). The spacing be~een opposing crush ribs 108 is less than the diameter of ,.,a~n~t 24 Thus, when magnet 24 is inserted into hofe 102 (as shown by the arrow in Fig. 6), the c:ylindrical sides of magnet 24 engage and de~orm crusll ribs 108.
De:ru~ d crush rlbs 108 sealrely embed magnet 24 in hole 102.
N~.L~ s~, to further embed magnets 24 each ,-,a~n--t-~~ontaining hole 102 is also cl~s~ dunng f~.i.,d~iGn by forming an integral plastic shell 11Q oYer magnet 24 (Fig. 7). Shell 110 is folmed by ..-~ a regions of the sidewalls of hol~ 102 and urging the melted pfastic to~ether over magnet 24 to completefy cover magnet 24 and close hole 102--fully encapsulating magnet 24 u~ithin hùb 106.
4 PCT~US96/15773 Each shell 110 is formed as follows. A pair of ridges 1 12 (Fig.
6) are molded into hub annular sur~ace 101 adjacent the sides Qf each hole 102. After ma~3net 24 has been inserted into lower 5 cham~er 103, an ultrasonic horn (not shown) is placed over hole 102 so that the edges of the horn engage ridges 1 12. The horn is t~len activated with high freq~ency energy, which causes the horn to ~ibrate rapidly and rnelt ridges 112 and underlying regions of the llole sidewalls. Simultaneously, th~ horn is pressed ~ownwardly to displace the ll,ell~ ds~i~ into hole 102. Magnet 24 Cllrrorts the melted plastic so ~hat the plastic flows over and aroun~ the magnet, thereby forrning shell 110.
Ridses 1 12 and the sidewalls of hole 102 provide sufficlent 1 ! i material to ensure that the melted pl~;,li., completely covers magnet 24, extending the full lengtll and wid~ll of hole 102. When tlle hom is de ener~ized and removed, rnelted plastic shell 110 sohdifies over and around rnagnet 24, thereby closing hole 102 and eno~rslJlAting magnet 24 ther~3in. Put another wa~, magnet-containing ho~e 1~2 is 20 closed and magnet 24 is ul~la~,nically welded irl place within sinsle-piece plastic hub 106 using regions of hub 106 that previously r~r",~l the sidewalls (and ndges 11Z) of hole 102.
Plastic shells 110 may be ~r,~.e~ one at a ~irne ~using a 2~; single ultrasonic horn), or all shells 11Q may be formed simultaneously using a set of four lllLId;,~.l.ic horns. In either case7 after all plastic shells 110 are fc,r~ d, silicone seal E~0 (~ 5r,ZlSc~
above and shown in Fig. 4~ is secured over annular hub surface 101 around hub collar 114 as ~i~cuss~ above ~one opening in collar 60 30 for a sea~ tab 62 is shown in Fig. 73.
CA 0223l506 l998-03-30 PCTrUS96/15773 Referring to fig. 8, magnets Z~ need not t:e ~ully encapsulated by plastic of hub walls 104. Instead, a reduced amol~nt of p~astic from the sides of each hole 102 may be melted ~such as by the ultrasonically weldin~ techniqùe dis~uss~l above) ~o form a pair of plastic flaps 1 16 over magnet 24. Flaps 1 16 conform to the shape of, and almost completely cover, ma~net 24, as shown.
~ecause a reduced arnount of plastic is needed to form flap~ 116 relative ta that required to fabricate shells 110, ridges 112 (Fig. 6) need not be provided adjacent t~ holes 102. In fact. if desired, a pair o~ notches may be formed in hub sulface 101 adjacent each hoie 102 to rec~i~e and help properly align the-ultrasonic horn over the hole.
Referring also to Fig Q, the region 115 beh.Yeen ~aps 116 1~ and the annu~ar hub surface 101 may be filled with a ~ulli~ ter;dl 118 to f~llly enc~rsul~f.~ magnet 24. Any suitable potting material 118 (for example, an ultraviolet curing adhesi~e) can be ~sed.
Potting material 118 should be sufficiently rugged to withstand steriilzation procedures such as autoclavin~. r~,t~ material 118 may, of course, also be used with pbstic shells 110 of Fig. 7.
Fi3s. 10 and 11 illustrate y~t another war of embedding magnets 24 within cylindrical walls 104 of hub 10~. Instead of using integral regions of hub walls 104, a small ~laa~i~, cap 1ZO iS secured 2~ in place overeach magnet24 to enc2rs~ te itwithin hole 102 Cap 120 is rect~ngul~r and fits ~vithin a corresponding enlarged fe~,eSS
1Z2 in the upp~r region of hole tO2. This ~lows cap 1Z0 to lie flush with the hub surface 101 (Fig 1 1) AlternatiYely~ recess 122 may be omitted, and cap 120 may rest on sur~ace 101. The edges of e~ch cap 120 may be cu~ed (rather than straight) so that ~aps 12~
generally follow the curved contour of cyli~-~Jrical hub wall 104.
W O 97112554 PCT~US96/15773 ' 16 Th~ underside 121 of cap 120 is arched tc~ match t~e cylindrical sides of magnet 24. Cap 120 is secur~d in pla~e by the lJltrasonic welding technique dicc~ss~d above. A pair of ndges 126 ~ormed in the upF~er suAace of recess 122 adjacent hole 102 serve as energy directors to focus the energ~ applied by the ultrasonic horn and cau~e the sidewal3s of hole 102 to melt and bond with cap underside 1Z1 over rnagnet 24 as cap 120 is urged downwardly As a result, cap 120 fully encapsulates magnet 24 within hub wall 104, as shown in Fi~. 11.
Ref~.li"y to Figs. 12 ~nd 13 seal 60 may have other config~rations. anc~ may be 14c,~t.v 3 ~ re on the in~trument For example, seal 128 ~used with hub 130 of Flg. 12 include~ a set of windows 134 that t:~r-~'' magnet-co~ ,ing holes 102. In Fig. 12, plas~ic shells 110 ~Fig. 7) cover magnets 24 in holes 102. But any of the other techrliques des~ribed ~bove for axially ret;~ining magnets in hofes 102 may be used instead. Seal 128 is c,rr~. J to hub collar 136 in the sarne way as ~isc~sse~l above for seal ~30 2~3 As shown in FTg. 13, the seal can be placed remotely from hub surface 101 and the proximal end of the hu~. In hub 140, the sealing function i5 provided b)r an O-ring 142, locat~J int~ 3iate annular surface 101 (i.e., the sufface of the h~Jb walls in which the 2~; magnet-corltain)ng holes ar~3 f~,.",e~) and the hub distal end. Drive shafl: retalning tabs 62 (Fig. 2) are held within openings (not shown) of hub collar 142 by a thin-walled sleeve 144 that does nclt cover rnagnet~ t~i.,i..~ holes 102. As a result, ~..dg~,2t-containing holes 102, ~/vhether ~overed by shells 1 10 (Fis~. 7), flaps 1 16 (Fig. 8), potbng ~I~.3t~ial (Fig. 9), or caps 1;20 (Fig. 1 1), are visible.
W O 97/12~54 PCT~US96/15773 Referrlng to Figs. 14-16, magnets 24 may be embedded within hub 150 durin~ the injection moWing process used to ~orm l~ub 1~0. Each magnet 24 is held within a moid (not separately shown) for the hub by a core pin 152 that extends into the mold ~ 5 ad~acent to ~ tube 154 that defines the interic~r surface of hub wall 158. Each magnet 24 is held within a corresponding cup-shaped seat 160 on a region 162 of core pin 152 in any suitable way (for example, pneur~ licdlly, mechanically, or~ tic~lly).
Hut~ 150 may be forrned in a single injection rnolding step. ln this case, magnet~ 24 a~e held by core pin 162 ~and core pin 152 remains in the mold) dunnsl the entire molding pr~ces~ As a result, one circ~llar ~ace of each emL. ~ded ~ y..e;t 24 is PYrns~ to r~sC~e ~0 (Fi~. 1 ) in the hub that r~c~ivc~ ~he tnner tube dri~e shaft. In ~ tl~n, regions 162 of core pin t52 create shallo~v slots aiong the inner sur~ace of the cy~ ri~l hub wall 1~8. Neither the exposed ",aa~"ct face nor the s~ots i~ r~r~a with the tol~liui~ of the drive shaft.
As an alternative, hub 150 may be i.. j -cliun molded in two steps. Part of ma~3net 24 is a~vered by pl~sti~ of cylindncal hl~b wall 158 in the first step, thereby securing magnet 24 in place. Then, magnets 24 are rel~-s- ~ by remo~ ing core pin i 52. and replacing i~
with an element ~not shown) slightly sm~ller in diameter. This 2~ provites space in the rnold adjacent ~o magnets 24 for the subsequently-injected plastic. Then, remainder of hub 150 is formed in the second injel,liu.,. thereby completely encas~ng magnet 24 in the plastic Cy~ ri~ ~alls 158 of hub 150 (i.e., no part o~ magnet 24 i5 visible).
The surgical instrul"~"l~ d~scribed herein typic~3lly are "disposable;" that is, the instruments are meant to be used once arld then discarded. The sur~icaJ instruments rnay instead be "reusabl~" r multiple time~ In this cas~. the pl-~tic hub and the techniques used to embed ma~nets 24 within the ~ytindrical walls of the hub must be sufficlently rugged to withstand sterilization after use.
Still other em~diments are within the scope of the claims.
6) are molded into hub annular sur~ace 101 adjacent the sides Qf each hole 102. After ma~3net 24 has been inserted into lower 5 cham~er 103, an ultrasonic horn (not shown) is placed over hole 102 so that the edges of the horn engage ridges 1 12. The horn is t~len activated with high freq~ency energy, which causes the horn to ~ibrate rapidly and rnelt ridges 112 and underlying regions of the llole sidewalls. Simultaneously, th~ horn is pressed ~ownwardly to displace the ll,ell~ ds~i~ into hole 102. Magnet 24 Cllrrorts the melted plastic so ~hat the plastic flows over and aroun~ the magnet, thereby forrning shell 110.
Ridses 1 12 and the sidewalls of hole 102 provide sufficlent 1 ! i material to ensure that the melted pl~;,li., completely covers magnet 24, extending the full lengtll and wid~ll of hole 102. When tlle hom is de ener~ized and removed, rnelted plastic shell 110 sohdifies over and around rnagnet 24, thereby closing hole 102 and eno~rslJlAting magnet 24 ther~3in. Put another wa~, magnet-containing ho~e 1~2 is 20 closed and magnet 24 is ul~la~,nically welded irl place within sinsle-piece plastic hub 106 using regions of hub 106 that previously r~r",~l the sidewalls (and ndges 11Z) of hole 102.
Plastic shells 110 may be ~r,~.e~ one at a ~irne ~using a 2~; single ultrasonic horn), or all shells 11Q may be formed simultaneously using a set of four lllLId;,~.l.ic horns. In either case7 after all plastic shells 110 are fc,r~ d, silicone seal E~0 (~ 5r,ZlSc~
above and shown in Fig. 4~ is secured over annular hub surface 101 around hub collar 114 as ~i~cuss~ above ~one opening in collar 60 30 for a sea~ tab 62 is shown in Fig. 73.
CA 0223l506 l998-03-30 PCTrUS96/15773 Referring to fig. 8, magnets Z~ need not t:e ~ully encapsulated by plastic of hub walls 104. Instead, a reduced amol~nt of p~astic from the sides of each hole 102 may be melted ~such as by the ultrasonically weldin~ techniqùe dis~uss~l above) ~o form a pair of plastic flaps 1 16 over magnet 24. Flaps 1 16 conform to the shape of, and almost completely cover, ma~net 24, as shown.
~ecause a reduced arnount of plastic is needed to form flap~ 116 relative ta that required to fabricate shells 110, ridges 112 (Fig. 6) need not be provided adjacent t~ holes 102. In fact. if desired, a pair o~ notches may be formed in hub sulface 101 adjacent each hoie 102 to rec~i~e and help properly align the-ultrasonic horn over the hole.
Referring also to Fig Q, the region 115 beh.Yeen ~aps 116 1~ and the annu~ar hub surface 101 may be filled with a ~ulli~ ter;dl 118 to f~llly enc~rsul~f.~ magnet 24. Any suitable potting material 118 (for example, an ultraviolet curing adhesi~e) can be ~sed.
Potting material 118 should be sufficiently rugged to withstand steriilzation procedures such as autoclavin~. r~,t~ material 118 may, of course, also be used with pbstic shells 110 of Fig. 7.
Fi3s. 10 and 11 illustrate y~t another war of embedding magnets 24 within cylindrical walls 104 of hub 10~. Instead of using integral regions of hub walls 104, a small ~laa~i~, cap 1ZO iS secured 2~ in place overeach magnet24 to enc2rs~ te itwithin hole 102 Cap 120 is rect~ngul~r and fits ~vithin a corresponding enlarged fe~,eSS
1Z2 in the upp~r region of hole tO2. This ~lows cap 1Z0 to lie flush with the hub surface 101 (Fig 1 1) AlternatiYely~ recess 122 may be omitted, and cap 120 may rest on sur~ace 101. The edges of e~ch cap 120 may be cu~ed (rather than straight) so that ~aps 12~
generally follow the curved contour of cyli~-~Jrical hub wall 104.
W O 97112554 PCT~US96/15773 ' 16 Th~ underside 121 of cap 120 is arched tc~ match t~e cylindrical sides of magnet 24. Cap 120 is secur~d in pla~e by the lJltrasonic welding technique dicc~ss~d above. A pair of ndges 126 ~ormed in the upF~er suAace of recess 122 adjacent hole 102 serve as energy directors to focus the energ~ applied by the ultrasonic horn and cau~e the sidewal3s of hole 102 to melt and bond with cap underside 1Z1 over rnagnet 24 as cap 120 is urged downwardly As a result, cap 120 fully encapsulates magnet 24 within hub wall 104, as shown in Fi~. 11.
Ref~.li"y to Figs. 12 ~nd 13 seal 60 may have other config~rations. anc~ may be 14c,~t.v 3 ~ re on the in~trument For example, seal 128 ~used with hub 130 of Flg. 12 include~ a set of windows 134 that t:~r-~'' magnet-co~ ,ing holes 102. In Fig. 12, plas~ic shells 110 ~Fig. 7) cover magnets 24 in holes 102. But any of the other techrliques des~ribed ~bove for axially ret;~ining magnets in hofes 102 may be used instead. Seal 128 is c,rr~. J to hub collar 136 in the sarne way as ~isc~sse~l above for seal ~30 2~3 As shown in FTg. 13, the seal can be placed remotely from hub surface 101 and the proximal end of the hu~. In hub 140, the sealing function i5 provided b)r an O-ring 142, locat~J int~ 3iate annular surface 101 (i.e., the sufface of the h~Jb walls in which the 2~; magnet-corltain)ng holes ar~3 f~,.",e~) and the hub distal end. Drive shafl: retalning tabs 62 (Fig. 2) are held within openings (not shown) of hub collar 142 by a thin-walled sleeve 144 that does nclt cover rnagnet~ t~i.,i..~ holes 102. As a result, ~..dg~,2t-containing holes 102, ~/vhether ~overed by shells 1 10 (Fis~. 7), flaps 1 16 (Fig. 8), potbng ~I~.3t~ial (Fig. 9), or caps 1;20 (Fig. 1 1), are visible.
W O 97/12~54 PCT~US96/15773 Referrlng to Figs. 14-16, magnets 24 may be embedded within hub 150 durin~ the injection moWing process used to ~orm l~ub 1~0. Each magnet 24 is held within a moid (not separately shown) for the hub by a core pin 152 that extends into the mold ~ 5 ad~acent to ~ tube 154 that defines the interic~r surface of hub wall 158. Each magnet 24 is held within a corresponding cup-shaped seat 160 on a region 162 of core pin 152 in any suitable way (for example, pneur~ licdlly, mechanically, or~ tic~lly).
Hut~ 150 may be forrned in a single injection rnolding step. ln this case, magnet~ 24 a~e held by core pin 162 ~and core pin 152 remains in the mold) dunnsl the entire molding pr~ces~ As a result, one circ~llar ~ace of each emL. ~ded ~ y..e;t 24 is PYrns~ to r~sC~e ~0 (Fi~. 1 ) in the hub that r~c~ivc~ ~he tnner tube dri~e shaft. In ~ tl~n, regions 162 of core pin t52 create shallo~v slots aiong the inner sur~ace of the cy~ ri~l hub wall 1~8. Neither the exposed ",aa~"ct face nor the s~ots i~ r~r~a with the tol~liui~ of the drive shaft.
As an alternative, hub 150 may be i.. j -cliun molded in two steps. Part of ma~3net 24 is a~vered by pl~sti~ of cylindncal hl~b wall 158 in the first step, thereby securing magnet 24 in place. Then, magnets 24 are rel~-s- ~ by remo~ ing core pin i 52. and replacing i~
with an element ~not shown) slightly sm~ller in diameter. This 2~ provites space in the rnold adjacent ~o magnets 24 for the subsequently-injected plastic. Then, remainder of hub 150 is formed in the second injel,liu.,. thereby completely encas~ng magnet 24 in the plastic Cy~ ri~ ~alls 158 of hub 150 (i.e., no part o~ magnet 24 i5 visible).
The surgical instrul"~"l~ d~scribed herein typic~3lly are "disposable;" that is, the instruments are meant to be used once arld then discarded. The sur~icaJ instruments rnay instead be "reusabl~" r multiple time~ In this cas~. the pl-~tic hub and the techniques used to embed ma~nets 24 within the ~ytindrical walls of the hub must be sufficlently rugged to withstand sterilization after use.
Still other em~diments are within the scope of the claims.
Claims (46)
1. A surgical instrument comprising a hollow outer member having an opening in a distal region thereof for admitting tissue, an inner member disposed for movement within said outer member, a distal region of said inner member supporting a surgical tool adjacent to said opening, a plastic hub mounted to a proximal region of said outer member and including a passage therethrough for receiving a proximal region of said inner member, said plastic hub including a wall that encloses said passage, and at least one detectable coding element embedded at a selected circumferential position in said wall.
2 The surgical instrument of claim 1 wherein said wall includes at least one hole for receiving said at least one coding element, said at least one coding element being embedded in said hole.
3. The surgical instrument of claim 2 wherein said at least one hole is oriented radially with respect to a longitudinal axis of said hub.
4. The surgical instrument of claim 2 wherein said at least one hole is oriented axially with respect to a longitudinal axis of said hub.
5. The surgical instrument of claim 2 wherein said coding element is embedded in said hole by a friction fit with sides of said hole.
6. The surgical instrument of claim 5 wherein at least a portion of said sides of said hole includes protrusions adapted to be deformed when said coding element is received in said hole, thereby to provide said friction fit.
7. The surgical instrument of claim 2 wherein said coding element is embedded in said hole by a region of said plastic wall adjacent said hole that has been displaced to lie over at least a portion of said coding element.
8. The surgical instrument of claim 7 wherein said region of said plastic wall completely covers said coding element.
9. The surgical instrument of claim 7 wherein said region of said plastic wall includes a pair of flaps each of which at least partially covers said coding element.
10. The surgical instrument of claim 2 wherein said coding element is embedded in said hole by a plastic cap secured over said coding element.
11. The surgical instrument of claim 10 wherein said hole and said plastic cap are configured so that said cap is flush with an exterior surface of said wall adjacent to said hole.
12. The surgical instrument of claim 2 wherein said coding element is embedded in said hole by an adhesive.
13. The surgical instrument of claim 12 wherein said coding element is recessed in said hole from an exterior surface of said wall, said adhesive being disposed to fill said recess.
14. The surgical instrument of claim 1 wherein said coding element is molded into said wall.
15. The surgical instrument of claim 1 wherein said wall completely surrounds said coding element.
16. The surgical instrument of claim 1 wherein said coding element includes a magnet.
17. The surgical instrument of claim 1 wherein said hub is constructed so that up to a selected number of coding elements corresponding to a selected number of circumferential positions can be embedded in said wall.
18. The surgical instrument of claim 17 wherein each one of said selected number of coding elements is embedded in a hole at one of said selected circumferential positions in said wall.
19. The surgical instrument of claim 17 further comprising a plurality of said holes disposed in said selected circumferential positions in said wall, each one of said holes being adapted to have a said coding element embedded therein.
20. The surgical instrument of claim 19 wherein a said coding element is embedded in at least one of said holes.
21. The surgical instrument of claim 19 wherein a said coding element is embedded in each one of said holes.
22. The surgical instrument of claim 19 wherein at least one of said holes does not have a said coding element embedded therein.
23. The surgical instrument of claim 17 wherein said coding elements are molded into said wall at at least some of said selected circumferential positions.
24. The surgical instrument of claim 23 wherein said coding elements are molded into said wall at all of said selected circumferential positions.
25. The surgical instrument of claim 1 wherein said wall terminates in a surface transverse to a longitudinal axis of said hub at a proximal end of said hub, said hub further comprising at least one axially-oriented hole at said transverse surface, said at least one coding element being embedded in said hole, and a seal mounted on said hub.
26. The surgical instrument of claim 25 wherein said seal is disposed on at least a portion of said transverse surface.
27. The surgical instrument of claim 26 wherein said seal covers said hole.
28. The surgical instrument of claim 27 wherein said seal includes at least one window that exposes said hole.
29. The surgical instrument of claim 25 wherein said seal is disposed remote to said transverse surface.
30. A surgical system comprising the instrument of claim 1 together with a handpiece, said handpiece adapted to receive said hub in a selected orientation with respect to said selected circumferential position of said coding element, said handpiece being adapted to move said inner member within outer member to cause said surgical tool to cut tissue admitted through said opening in said outer member, and at least one sensor positioned to detect whether said at least one coding element present in said hub.
31. The surgical system of claim 30 wherein said at least one coding element includes a magnet, said at least one sensor comprising a switch adapted to be closed by a magnetic field generated by said magnet.
32. The apparatus of claim 30 wherein said at least one coding element includes a magnet, said at least one sensor comprising a device adapted to detect a magnetic field generated by said magnet and determine an orientation of said magnetic field.
33. The surgical system of claim 30 wherein said handpiece includes a motor for rotating said inner member within said outer member, and further comprising a controller for adjusting an operating parameter of said motor in response to said detecting by said at least one sensor.
34. A method for making surgical instrument comprising providing a hollow outer member having an opening in a distal region thereof for admitting tissue and having a plastic hub mounted to a proximal region thereof, said plastic hub including a wall that encloses a passage through said hub, embedding at least one detectable coding element at a selected circumferential position in said wall, and disposing an inner member through said passage of said hub for movement within said outer member so that a surgical tool supported by a distal region of said inner member is disposed adjacent to said opening.
35. The method of claim 34 further comprising defining at least one hole in said wall for receiving said at least one coding element, and embedding said at least one coding element in said hole.
36. The method of claim 35 further comprising orienting said at least one hole is radially with respect to a longitudinal axis of said hub.
37. The method of claim 35 further comprising orienting said at least one hole axially with respect to a longitudinal axis of said hub.
38. The method of claim 35 wherein said step of embedding includes providing a friction fit between said coding element and sides of said hole.
39. The method of claim 35 wherein said step of embedding includes displacing a region of a plastic wall adjacent said hole to lie over at least a portion of said coding element.
40. The method of claim 39 further comprising completely covering said coding element with said region of said plastic wall.
41. The method of claim 35 wherein said step of embedding includes securing a plastic cap over said coding element.
42 The method of claim 35 wherein said step of embedding includes securing said coding element in said hole with an adhesive.
43. The method of claim 34 further comprising forming said hub by injection molding, and wherein said step of embedding includes molding said coding element into said wall during said injection molding of said hub.
44. The method of claim 43 further comprising holding said coding element in said selected circumferential position during at least part of said injection molding of said hub.
45. The method of claim 43 further comprising holding said coding element until said injection molding of said hub is complete, and then releasing said coding element
46. The method of claim 43 further comprising holding said coding element until a portion of said coding element has been covered by plastic during said injection molding of said hub, then releasing said coding element, and then completing said injection molding of said hub
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/538,298 US5749885A (en) | 1995-10-02 | 1995-10-02 | Surgical instrument with embedded coding element |
| US08/538,298 | 1995-10-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2231506A1 true CA2231506A1 (en) | 1997-04-10 |
Family
ID=24146314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002231506A Abandoned CA2231506A1 (en) | 1995-10-02 | 1996-10-01 | Surgical instrument with embedded coding element |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5749885A (en) |
| EP (1) | EP0853463B1 (en) |
| JP (1) | JP2000507839A (en) |
| AR (1) | AR003775A1 (en) |
| AU (1) | AU709015B2 (en) |
| BR (1) | BR9610828A (en) |
| CA (1) | CA2231506A1 (en) |
| WO (1) | WO1997012554A1 (en) |
| ZA (1) | ZA968203B (en) |
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-
1996
- 1996-09-30 ZA ZA968203A patent/ZA968203B/en unknown
- 1996-10-01 AU AU73843/96A patent/AU709015B2/en not_active Expired
- 1996-10-01 CA CA002231506A patent/CA2231506A1/en not_active Abandoned
- 1996-10-01 JP JP9512994A patent/JP2000507839A/en active Pending
- 1996-10-01 WO PCT/US1996/015773 patent/WO1997012554A1/en active Application Filing
- 1996-10-01 EP EP96936113.8A patent/EP0853463B1/en not_active Expired - Lifetime
- 1996-10-01 BR BR9610828A patent/BR9610828A/en not_active Application Discontinuation
- 1996-10-02 AR ARP960104581A patent/AR003775A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| AU709015B2 (en) | 1999-08-19 |
| AU7384396A (en) | 1997-04-28 |
| JP2000507839A (en) | 2000-06-27 |
| WO1997012554A1 (en) | 1997-04-10 |
| BR9610828A (en) | 1999-07-13 |
| ZA968203B (en) | 1997-04-02 |
| EP0853463B1 (en) | 2016-05-18 |
| EP0853463A1 (en) | 1998-07-22 |
| US5749885A (en) | 1998-05-12 |
| EP0853463A4 (en) | 2001-02-07 |
| AR003775A1 (en) | 1998-09-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |