CA1275221C - Shear force gauge and method and apparatus for limiting embolectomy shear force - Google Patents
Shear force gauge and method and apparatus for limiting embolectomy shear forceInfo
- Publication number
- CA1275221C CA1275221C CA000532126A CA532126A CA1275221C CA 1275221 C CA1275221 C CA 1275221C CA 000532126 A CA000532126 A CA 000532126A CA 532126 A CA532126 A CA 532126A CA 1275221 C CA1275221 C CA 1275221C
- Authority
- CA
- Canada
- Prior art keywords
- catheter
- gauge
- tension
- shear force
- embolectomy
- 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.)
- Expired - Lifetime
Links
- 238000013156 embolectomy Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title abstract description 12
- 239000012530 fluid Substances 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 210000001367 artery Anatomy 0.000 description 9
- 208000005189 Embolism Diseases 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 210000000013 bile duct Anatomy 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000003038 endothelium Anatomy 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000002485 urinary effect Effects 0.000 description 1
Classifications
-
- 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
- A61B17/3205—Excision instruments
- A61B17/3207—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/03—Automatic limiting or abutting means, e.g. for safety
Abstract
SHEAR FORCE GAUGE AND METHOD AND APPARATUS FOR LIMITING EMBOLECTOMY SHEAR FORCE Abstract of the Disclosure A shear force gauge for applying tension to an elongate wire or a catheter element and continuously sensing the amount of such tension. The gauge comprises a clamp adapted to frictionally engage the elongate element and a spring gauge secured to the clamp to apply tension thereto. In the preferred embodiment, the clamp is adjustable to permit the elongate element to slip relative thereto upon reaching a predetermined tension limit.
Description
~.~7S~
SHEAR FORCE GAUGE AND METHOD RND
APPARATUS FOR LIMITING EMBOLECTOMY
SHEAR FORCE
Background of_the Invention The present invention relates to a shear force gauge for use with elongate catheter and wire elements to monitor the amount of tension applied thereto and, in the preferred embodiment, limit that tension. It is particularly concerned with such a gauge which may be used in an improved embolectomy apparatus and method to limit the amount of shear ~orce exerted on the wall of an artery during the embolectomy process.
The prior art teaches controlling the inflation of expansible tip balloon catheters (see, for example, Foderick U~S. PatPnt No. 3,211,150). It is also known to use balloon catheters for embolectomy purposes. See Fogarty U.S. Patent 3,43~,82~ and Fettel Patent 3,~78,863.
The latter patent is particularly interestin~ in that it discloses an apparatus and methocl for monitoring and controlling the inflation of an embolectomy balloon.
External indicators to show the in~lation of an internal balloon in a urinary ca~heter are also known (see, for example, McWhorter U.S. Patent 3,543,759).
While the above prior art teaches embolectomy catheters and methods and apparatuses for controlling the inflation of a catheter balloon, it does not teach the concept of measuring the tension Qf the catheter on an embolectomy balloon to monitor and limit the shear force appLied to an artery during embolectomy catheter use.
.: . . . , ~ .
" . ' ' . . ' ' . , . ' .
~.~7~
S~lary of the Inventlon In its broadest aspects, the apparatus oE
the invention is concerned with a shear force gauge for applying controlled tension to an elongate wire or catheter el~ment. The gauge comprises a ~ir~t means to grip the element, a second means secured to the first means to apply tension to an elongate element gripped by the first means, and a third means operatively associate~ with the second means to sense the force applied to the first means throu~h the second means.
The third means may comprise a tension gauge and/or a friction clamp. The clamp in the preferred embodiment is adjustable and adaptable to limit the tension orce which may be applied to the elongate element.
It is a principal object of the invention to provide a shear fGrce gauge which may be used with an embolectomy catheter to limit the shear force ~xerted on an artery during an embolectomy process.
Another object o~ the invention is to provide such a gauge which may be used to continuously monitor the tension applied to an embolectomy catheter and limit the amount o~ such ten,sion.
Still another object is to provide such a gauge which is of simple construction and may be readily applied to existing embolectomy catheters without modi-~ication of the catheter.
Yet another object of the invention is to provid~ such a gauge which may be adjusted to limit the amount of tension applied therethrough.
.~ . . . . .
. . . .
- ' ': . - .
,, :~ ' ' Another object o~ the invention is to provide an embolectomy apparatus and method wherein shear force exerted on an artery duxing embolectomy may be monitored and limited.
The foregoing and other objects will become more apparent when viewed in light of the accompanying drawings and following detailed description.
Brief Description of the Drawinqs :
Fig. 1 is a perspective view of an embolectomy catheter embodying the shear force gauge-o the present invention, with the catheter shown in the process of removing an embolus fxom an artery;
Fig. 2 is a cross-sectional view of the shear force gauge, taken on the plane designated by line 2-15` 2 of Fig. l; and Fig. 3 is a cross-sectional view taken on the plane designated by line 3-3 of Fig. 2.
Descr~tion of the Preferred Embodiment .
Referring now to Fig~ 1, an artery 10 having an embolus 12 therein is shown in the process of being treated by an embolectomy catheter embodying the method and apparatus of the present invention. The catheter is designated by the numeral 14 and has an inflatable balloon 16 secured thereto proximate its distal end and an inflation s~ringe 18 secured thereto at its proximal end. The catheter 14, balloon 16 and syringe 1~ axe of conventional construction, such as may be seen in prior Fogarty U.S. Patent 3l4~5,826. A lumen 20 extends through the full length o~ ~he catheter.
., ~ . . . , . -, , ~ .. . .
..
., , . , The ~alloon 16 and syringe 18 are both in fluid communication with the lumen whereby the plunger 22 of the syringe may be compressed to apply fluid pressure ~o the interior o the balloon for balloon inflation.
A small port 24 provides ~or communication between the interior of the balloon and the through lumen. ~he distal end, designated 26, of the catheter is sealed so as to prevent the escape o~ fluid from the thxough lumen.
The principal elements of the shear force gauge comprise a first or clamp elemen~ ~8 adapted to grip the catheter, a ~econd or intermediate elem~nt 30 threada~ly secured to the clamp element to apply force thereto and tension the catheter; and a third or tension applying and sensing element 32 secured to the element 30 by a coil spring 34. As can be seen from Fig. 2, the element 30 is o~ an elongate tubular configuration with a bore 36 ~ormed longitudinally therethrough. The catheter 14 extends through this bore.
~ he element 28 takes the form of a compression nut 38 having a pair of O-rings 40 received therein in concantric relation to the catheter 14. The amount of tension which may be applied to the cathetex 14 through the clamp element 28 may be adjusted by select adjustment of the amount of compression applied to the O~rings by the nut 38. Such adjustment provides for slippage of the catheter relative to the O-rings when the tension exceeds a predetermined adjusted limit.
.
~he intermediate element 30 comprises a forward end 42 on which the screw threads received within ~he : , , . : .
- . . .
.. ..
s~
compres~ion nut are formed, and an elongate tubular rearward end 44. The latter end is formed within numerical indicia along the length thereof which, in cooperation with the element 32~ serve as means to measure the tension applied to the catheter 14 through the gauge. An enlarged boss 46 is formed on the element 30 intermediate the ends 42 and 44 and is formed with openings 48 ~or receipt o~ the coils of the spring 34.
Through the latter boss and openings, the spring i~
secured in tension-imparting relationship to the element 30.
The element 32 is slidably received on the rearward end 44 o~ the element 30. A passage 50 extend-iny through the element 32 accommodates such slidable receipt. The forward end of the element 32 is formed with an enlarged boss 52 formed wlth openin~s S~ there-through for receipt of the coils of the spring 34.
Through the latter openings, the spring is secured in tension-impartlng relationship to the elemen~ 32 and tension applied to the element 32 is transmitted to the element 30 thxough the spring~ Finger grooves 56 formed in the outer surface of the element 32 ~acilitate the manual application o~ tension t~ the element.
In use, the tension gallge is applied to the embolectomy catheter by sliding the gauge over and into concentric relationship with the catheterwhile the balloon 16 is in a deflated condition. This results in the catheter and gauge being assembled into the con~
ditio~ shown in Fig. 1. Then the gauge is slid to the desired position ~long the l~ngth of the catheter and the compression nut 38 is adjusted to secure the clamp element 28 to the catheter With the desired degree o~
gripping ~orce. This ~orce may be measu~ed by pulling : , .' . . ' ~ ' .- , -"'''''. ' ' ' '' ,, ' '' ~' ~ '' '' ~' "
,, . . : .. . .. ~ .
: , .
on the element 32 while holding the distal end of the catheter secure. Such measurement will be indicat~d by the position of the element 3~ relative to the numerical indicia on the redrward end 44 o~ the element 30.
With the gauge and ca-theter so assembled, the embolectomy-process is carried out by directing the catheter through the artery to be treated and past the embolus therein, with the balloon 16 in a deflated condition. Once the catheter and balloon are so positioned, as seen in Fig. 1, the balloon is inflated by compressing the plunger 32. Then the catheter is withdrawn from the artery by pulling on the catheter through the finger grooves in the element 32. Such pulling functions to apply tension to the catheter 14 through the spring 34 and the clamp element 28. That tension may he continuously sensed and monitored by observing the position of the el~nen~ 32 relative to the numerical indicia on the rearward end 44 o~ the ~0 element 30. As the shear force thus measured starts to approach the maximum desired level, the speed of withdrawal o~ the catheter may be altered to decrease the shear ~orce exerted on the artery. If -this is not sufficient, partial deflation,of the balloon may be effected~ In the event the shear force somehow exceeds the predetermined maximum degree permitted by the clamp element 28, the clamp element will permit the catheter to slide relative thereto.
Conclusion From the foregoing detailed description, it is believed apparent that the present invention enables the attainment o~ the objects initially set forth herein.
In particular, the invention provides means for limiting ~.: , - . - ,- - .
, - , : :
.
: . ' ' . ' : ' : ': '' . `' ' . ' ' " ' ~ ' - ;''. , '. ~ ' the shear force exerted on a vessel wall by an emb~lecto~y ca~heter. Thus, damage of the arterial endothelium and the possible formation o~ intimal ~laps is avoided.
While a preferred embodiment of the invention in an embolectomy catheter has been shown, i-t is to be understood that the invention is not intended to be limited to this embodiment. For example, the gauge may also find use in applying tension to elongate elements other than catheters, such as the wires used to support calibrating catheters and other instruments.
It is also anticipated that the shear force gauge ~a~
be used with other balloon catheters lfor example, in the biliary ~ystem, to probe the bile ducts). Immediate shear force measurements will decrease the incidence o~ injury and complications associated with the use o~ such balloon catheters.
- - . , , - -, . ~
., . ,, . . ., . .- . , ,., ,, . : :: .
' ., ~ . , ~ . , ' '' ':
SHEAR FORCE GAUGE AND METHOD RND
APPARATUS FOR LIMITING EMBOLECTOMY
SHEAR FORCE
Background of_the Invention The present invention relates to a shear force gauge for use with elongate catheter and wire elements to monitor the amount of tension applied thereto and, in the preferred embodiment, limit that tension. It is particularly concerned with such a gauge which may be used in an improved embolectomy apparatus and method to limit the amount of shear ~orce exerted on the wall of an artery during the embolectomy process.
The prior art teaches controlling the inflation of expansible tip balloon catheters (see, for example, Foderick U~S. PatPnt No. 3,211,150). It is also known to use balloon catheters for embolectomy purposes. See Fogarty U.S. Patent 3,43~,82~ and Fettel Patent 3,~78,863.
The latter patent is particularly interestin~ in that it discloses an apparatus and methocl for monitoring and controlling the inflation of an embolectomy balloon.
External indicators to show the in~lation of an internal balloon in a urinary ca~heter are also known (see, for example, McWhorter U.S. Patent 3,543,759).
While the above prior art teaches embolectomy catheters and methods and apparatuses for controlling the inflation of a catheter balloon, it does not teach the concept of measuring the tension Qf the catheter on an embolectomy balloon to monitor and limit the shear force appLied to an artery during embolectomy catheter use.
.: . . . , ~ .
" . ' ' . . ' ' . , . ' .
~.~7~
S~lary of the Inventlon In its broadest aspects, the apparatus oE
the invention is concerned with a shear force gauge for applying controlled tension to an elongate wire or catheter el~ment. The gauge comprises a ~ir~t means to grip the element, a second means secured to the first means to apply tension to an elongate element gripped by the first means, and a third means operatively associate~ with the second means to sense the force applied to the first means throu~h the second means.
The third means may comprise a tension gauge and/or a friction clamp. The clamp in the preferred embodiment is adjustable and adaptable to limit the tension orce which may be applied to the elongate element.
It is a principal object of the invention to provide a shear fGrce gauge which may be used with an embolectomy catheter to limit the shear force ~xerted on an artery during an embolectomy process.
Another object o~ the invention is to provide such a gauge which may be used to continuously monitor the tension applied to an embolectomy catheter and limit the amount o~ such ten,sion.
Still another object is to provide such a gauge which is of simple construction and may be readily applied to existing embolectomy catheters without modi-~ication of the catheter.
Yet another object of the invention is to provid~ such a gauge which may be adjusted to limit the amount of tension applied therethrough.
.~ . . . . .
. . . .
- ' ': . - .
,, :~ ' ' Another object o~ the invention is to provide an embolectomy apparatus and method wherein shear force exerted on an artery duxing embolectomy may be monitored and limited.
The foregoing and other objects will become more apparent when viewed in light of the accompanying drawings and following detailed description.
Brief Description of the Drawinqs :
Fig. 1 is a perspective view of an embolectomy catheter embodying the shear force gauge-o the present invention, with the catheter shown in the process of removing an embolus fxom an artery;
Fig. 2 is a cross-sectional view of the shear force gauge, taken on the plane designated by line 2-15` 2 of Fig. l; and Fig. 3 is a cross-sectional view taken on the plane designated by line 3-3 of Fig. 2.
Descr~tion of the Preferred Embodiment .
Referring now to Fig~ 1, an artery 10 having an embolus 12 therein is shown in the process of being treated by an embolectomy catheter embodying the method and apparatus of the present invention. The catheter is designated by the numeral 14 and has an inflatable balloon 16 secured thereto proximate its distal end and an inflation s~ringe 18 secured thereto at its proximal end. The catheter 14, balloon 16 and syringe 1~ axe of conventional construction, such as may be seen in prior Fogarty U.S. Patent 3l4~5,826. A lumen 20 extends through the full length o~ ~he catheter.
., ~ . . . , . -, , ~ .. . .
..
., , . , The ~alloon 16 and syringe 18 are both in fluid communication with the lumen whereby the plunger 22 of the syringe may be compressed to apply fluid pressure ~o the interior o the balloon for balloon inflation.
A small port 24 provides ~or communication between the interior of the balloon and the through lumen. ~he distal end, designated 26, of the catheter is sealed so as to prevent the escape o~ fluid from the thxough lumen.
The principal elements of the shear force gauge comprise a first or clamp elemen~ ~8 adapted to grip the catheter, a ~econd or intermediate elem~nt 30 threada~ly secured to the clamp element to apply force thereto and tension the catheter; and a third or tension applying and sensing element 32 secured to the element 30 by a coil spring 34. As can be seen from Fig. 2, the element 30 is o~ an elongate tubular configuration with a bore 36 ~ormed longitudinally therethrough. The catheter 14 extends through this bore.
~ he element 28 takes the form of a compression nut 38 having a pair of O-rings 40 received therein in concantric relation to the catheter 14. The amount of tension which may be applied to the cathetex 14 through the clamp element 28 may be adjusted by select adjustment of the amount of compression applied to the O~rings by the nut 38. Such adjustment provides for slippage of the catheter relative to the O-rings when the tension exceeds a predetermined adjusted limit.
.
~he intermediate element 30 comprises a forward end 42 on which the screw threads received within ~he : , , . : .
- . . .
.. ..
s~
compres~ion nut are formed, and an elongate tubular rearward end 44. The latter end is formed within numerical indicia along the length thereof which, in cooperation with the element 32~ serve as means to measure the tension applied to the catheter 14 through the gauge. An enlarged boss 46 is formed on the element 30 intermediate the ends 42 and 44 and is formed with openings 48 ~or receipt o~ the coils of the spring 34.
Through the latter boss and openings, the spring i~
secured in tension-imparting relationship to the element 30.
The element 32 is slidably received on the rearward end 44 o~ the element 30. A passage 50 extend-iny through the element 32 accommodates such slidable receipt. The forward end of the element 32 is formed with an enlarged boss 52 formed wlth openin~s S~ there-through for receipt of the coils of the spring 34.
Through the latter openings, the spring is secured in tension-impartlng relationship to the elemen~ 32 and tension applied to the element 32 is transmitted to the element 30 thxough the spring~ Finger grooves 56 formed in the outer surface of the element 32 ~acilitate the manual application o~ tension t~ the element.
In use, the tension gallge is applied to the embolectomy catheter by sliding the gauge over and into concentric relationship with the catheterwhile the balloon 16 is in a deflated condition. This results in the catheter and gauge being assembled into the con~
ditio~ shown in Fig. 1. Then the gauge is slid to the desired position ~long the l~ngth of the catheter and the compression nut 38 is adjusted to secure the clamp element 28 to the catheter With the desired degree o~
gripping ~orce. This ~orce may be measu~ed by pulling : , .' . . ' ~ ' .- , -"'''''. ' ' ' '' ,, ' '' ~' ~ '' '' ~' "
,, . . : .. . .. ~ .
: , .
on the element 32 while holding the distal end of the catheter secure. Such measurement will be indicat~d by the position of the element 3~ relative to the numerical indicia on the redrward end 44 o~ the element 30.
With the gauge and ca-theter so assembled, the embolectomy-process is carried out by directing the catheter through the artery to be treated and past the embolus therein, with the balloon 16 in a deflated condition. Once the catheter and balloon are so positioned, as seen in Fig. 1, the balloon is inflated by compressing the plunger 32. Then the catheter is withdrawn from the artery by pulling on the catheter through the finger grooves in the element 32. Such pulling functions to apply tension to the catheter 14 through the spring 34 and the clamp element 28. That tension may he continuously sensed and monitored by observing the position of the el~nen~ 32 relative to the numerical indicia on the rearward end 44 o~ the ~0 element 30. As the shear force thus measured starts to approach the maximum desired level, the speed of withdrawal o~ the catheter may be altered to decrease the shear ~orce exerted on the artery. If -this is not sufficient, partial deflation,of the balloon may be effected~ In the event the shear force somehow exceeds the predetermined maximum degree permitted by the clamp element 28, the clamp element will permit the catheter to slide relative thereto.
Conclusion From the foregoing detailed description, it is believed apparent that the present invention enables the attainment o~ the objects initially set forth herein.
In particular, the invention provides means for limiting ~.: , - . - ,- - .
, - , : :
.
: . ' ' . ' : ' : ': '' . `' ' . ' ' " ' ~ ' - ;''. , '. ~ ' the shear force exerted on a vessel wall by an emb~lecto~y ca~heter. Thus, damage of the arterial endothelium and the possible formation o~ intimal ~laps is avoided.
While a preferred embodiment of the invention in an embolectomy catheter has been shown, i-t is to be understood that the invention is not intended to be limited to this embodiment. For example, the gauge may also find use in applying tension to elongate elements other than catheters, such as the wires used to support calibrating catheters and other instruments.
It is also anticipated that the shear force gauge ~a~
be used with other balloon catheters lfor example, in the biliary ~ystem, to probe the bile ducts). Immediate shear force measurements will decrease the incidence o~ injury and complications associated with the use o~ such balloon catheters.
- - . , , - -, . ~
., . ,, . . ., . .- . , ,., ,, . : :: .
' ., ~ . , ~ . , ' '' ':
Claims (9)
1. A shear force gauge for applying controlled tension to an elongate wire or catheter element, said gauge comprising: first means to grip the element, said first means being slidable relative to the element and gripping the element through frictional engagement therewith; second means secured to the first means to apply force thereto and tension to an element gripped thereby; third means operatively associated with the second means to sense the force applied to the first means through the second means; and, means to adjust the degree of frictional engagement between the first means and the element to permit the first means to slip relative to the element to limit the tension applied to the element.
2. A shear force gauge according to Claim 1 wherein the first means comprises an annular clamp through which the element extends and means selectively compress the clamp into engagement with the element with varying degrees of force.
3. A shear force gauge for applying controlled tension to an elongate wire or catheter element, said gauge comprising: first means to grip the element comprising a tube through which the element is extended; second means slidably received on the tube and secured to the first means through a deflectable spring to apply force to the first means and tension to the element gripped thereby; and, third means comprising a gauge operatively associated with the second means to measure movement of the second means relative to the first means.
4. A shear force gauge according to Claim 3 wherein the gauge comprises indicia marked along the length of the tube and a follower on the second means alignable with said indicia.
5. A shear force gauge according to Claim 3 wherein the first means is slidable relative to the element and grips the element through frictional engagement therewith, said gauge further comprising means to adjust the degree of frictional engagement between the first means and the element to permit the first means to slip relative to the element to limit the tension applied to the element.
6. A shear force gauge according to Claim 5 wherein the first means comprises an annular clamp through which the element extends and means selectively compress the clamp into engagement with the element with varying degrees of force.
7. An improved embolectomy apparatus comprising: an elongate catheter having a through lumen; a balloon secured to the catheter proximate one end thereof in sealed fluid communication with the lumen; a syringe secured to the catheter proximate the other end thereof in sealed fluid communication with the lumen; first means carried by the catheter to selectively grip the catheter; second means secured to the first means to apply force thereto and tension to a catheter gripped thereby;
and third means operatively associated with the second means to sense the force applied to the first means through the second means.
and third means operatively associated with the second means to sense the force applied to the first means through the second means.
8. An improved embolectomy apparatus according to Claim 7 wherein the first means is slidable relative to the catheter and grips the catheter through frictional engagement therewith, said apparatus further comprising means to adjust the degree of frictional engagement between the first means and the catheter to permit the first means to slip relative to the catheter to limit the tension applied to the catheter.
9. An improved embolectomy apparatus according to Claim 8 wherein the first means comprises an annular clamp through which the catheter extends and means to selectively compress the clamp into engagement with the catheter with varying degrees of force.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US872,048 | 1986-06-05 | ||
| US06/872,048 US4721507A (en) | 1986-06-05 | 1986-06-05 | Shear force gauge and method and apparatus for limiting embolectomy shear force |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1275221C true CA1275221C (en) | 1990-10-16 |
Family
ID=25358726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000532126A Expired - Lifetime CA1275221C (en) | 1986-06-05 | 1987-03-16 | Shear force gauge and method and apparatus for limiting embolectomy shear force |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4721507A (en) |
| EP (1) | EP0251976B1 (en) |
| JP (1) | JP2678272B2 (en) |
| CA (1) | CA1275221C (en) |
| DE (1) | DE3771003D1 (en) |
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| US5211651A (en) * | 1989-08-18 | 1993-05-18 | Evi Corporation | Catheter atherotome |
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| US5522834A (en) * | 1992-10-15 | 1996-06-04 | Applied Medical Resources Corporation | Internal mammary artery catheter and method |
| US5643297A (en) * | 1992-11-09 | 1997-07-01 | Endovascular Instruments, Inc. | Intra-artery obstruction clearing apparatus and methods |
| US5571122A (en) * | 1992-11-09 | 1996-11-05 | Endovascular Instruments, Inc. | Unitary removal of plaque |
| AU6029696A (en) * | 1995-06-07 | 1996-12-30 | St. Jude Medical Inc. | Adjustable sizing apparatus for heart annulus |
| US5769871A (en) * | 1995-11-17 | 1998-06-23 | Louisville Laboratories, Inc. | Embolectomy catheter |
| US6395208B1 (en) | 1999-01-25 | 2002-05-28 | Atrium Medical Corporation | Method of making an expandable fluoropolymer device |
| US6955661B1 (en) * | 1999-01-25 | 2005-10-18 | Atrium Medical Corporation | Expandable fluoropolymer device for delivery of therapeutic agents and method of making |
| US7637886B2 (en) * | 1999-01-25 | 2009-12-29 | Atrium Medical Corporation | Expandable fluoropolymer device and method of making |
| KR100536405B1 (en) * | 2002-09-09 | 2005-12-14 | 사회복지법인 삼성생명공익재단 | Apparatus for coronary angioplasty capable of finely adjusting a catheter |
| US7141025B2 (en) * | 2002-11-29 | 2006-11-28 | Guillermo Hernan Davila | Apparatus and method for qualitative assessment of pelvic floor muscular strength |
| US7572274B2 (en) * | 2004-05-27 | 2009-08-11 | Cardiva Medical, Inc. | Self-tensioning vascular occlusion device and method for its use |
| US7993366B2 (en) * | 2004-05-27 | 2011-08-09 | Cardiva Medical, Inc. | Self-tensioning vascular occlusion device and method for its use |
| US7770466B2 (en) * | 2008-07-02 | 2010-08-10 | Abbott Cardiovascular Systems Inc. | Method for measuring stent dislodgement force |
| US10368886B2 (en) * | 2014-03-07 | 2019-08-06 | The University Of Akron | Surgical apparatus with force sensor for extraction of substances within the body |
| US10888346B2 (en) * | 2014-05-18 | 2021-01-12 | Legacy Ventures LLC | Clot retrieval system |
| KR101838188B1 (en) * | 2016-10-31 | 2018-03-13 | 비앤알(주) | Circular Stapler |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US326067A (en) * | 1885-09-08 | Sewing-machine | ||
| DE190092C (en) * | ||||
| US554969A (en) * | 1896-02-18 | Tension device for check-row wires | ||
| US1012994A (en) * | 1911-03-22 | 1911-12-26 | Jay J Dixon | Temper-screw. |
| FR466514A (en) * | 1913-12-23 | 1914-05-15 | Auguste Angely | Safety torque clip for cables and other traction devices |
| US1330705A (en) * | 1917-09-20 | 1920-02-10 | Herrick Gerardus Post | Tool for tensioning wire |
| US3016741A (en) * | 1958-09-19 | 1962-01-16 | Harry W Kulp | Accessory for use by fishermen |
| US3211150A (en) * | 1963-08-15 | 1965-10-12 | Foderick John Walter | Balloon catheter with integral valves controlling inflation |
| US3435826A (en) * | 1964-05-27 | 1969-04-01 | Edwards Lab Inc | Embolectomy catheter |
| US3557794A (en) * | 1968-07-30 | 1971-01-26 | Us Air Force | Arterial dilation device |
| US3543759A (en) * | 1969-07-14 | 1970-12-01 | Kendall & Co | Catheter with safety indicator |
| US3978863A (en) * | 1974-06-06 | 1976-09-07 | Bruce E. Fettel | Expanding tip embolectomy catheter with indicator balloon |
| US4089337A (en) * | 1976-12-01 | 1978-05-16 | James H. Harris | Uterine catheter and manipulator with inflatable seal |
| US4133303A (en) * | 1977-04-28 | 1979-01-09 | The Kendall Company | Hemostatic catheter and method |
| US4655749A (en) * | 1985-09-30 | 1987-04-07 | Fischione Eugene A | Angioplasty pressure controller |
-
1986
- 1986-06-05 US US06/872,048 patent/US4721507A/en not_active Expired - Lifetime
-
1987
- 1987-03-16 CA CA000532126A patent/CA1275221C/en not_active Expired - Lifetime
- 1987-04-07 DE DE8787630062T patent/DE3771003D1/en not_active Expired - Lifetime
- 1987-04-07 JP JP62083985A patent/JP2678272B2/en not_active Expired - Fee Related
- 1987-04-07 EP EP87630062A patent/EP0251976B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2678272B2 (en) | 1997-11-17 |
| EP0251976A3 (en) | 1988-01-20 |
| EP0251976A2 (en) | 1988-01-07 |
| EP0251976B1 (en) | 1991-06-26 |
| US4721507A (en) | 1988-01-26 |
| DE3771003D1 (en) | 1991-08-01 |
| JPS63252165A (en) | 1988-10-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKEC | Expiry (correction) | ||
| MKEC | Expiry (correction) |
Effective date: 20121205 |