CN100500110C - Anti-rotating self-locking bone fracture internal fixing device - Google Patents
Anti-rotating self-locking bone fracture internal fixing device Download PDFInfo
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- CN100500110C CN100500110C CNB2007101219317A CN200710121931A CN100500110C CN 100500110 C CN100500110 C CN 100500110C CN B2007101219317 A CNB2007101219317 A CN B2007101219317A CN 200710121931 A CN200710121931 A CN 200710121931A CN 100500110 C CN100500110 C CN 100500110C
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- sleeve
- screw rod
- bolt
- fixing device
- bone fracture
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Abstract
An anti-rotation self-locking fracture internal fixer consists of a screw stem, a sleeve and a bolt, wherein the front section of the screw stem is provided with a spiral blade, while the end head of the rear section is provided with a connecting structure connected with one end of the bolt; the outside diameter of at least the nesting-in part near the end head of the rear section of the screw stem is less than the inside diameter of the front end of the sleeve contacting the screw stem; the bolt is nested inside the sleeve to connect the screw stem and the sleeve together; the external surface of the bolt is provided with external thread, while corresponding part of the internal surface of the sleeve is provided with internal thread; the external surface of the end head of the sleeve far away from the far end of the screw stem is provided with sheetlike wings; in addition, the rear section of the screw stem and the sleeve are provided with a rotary limit structure. During use, the fixer is arranged in 'locking' status after the bolt is screwed up; moreover, the wings arranged on the sleeve have anti-rotation function, thereby preventing loosening of the fixer. The fixer has a simple operation, short surgery time, reduction loss of bone quantity and being beneficial to healing of fracture, thereby being particularly suitable for therapy of neck of femur fracture patient with bone loss.
Description
Technical field:
The present invention relates to a kind of anti-rotating self-locking bone fracture internal fixing device, especially a kind of have helical edges and band wing sleeve, but auto lock, and bone fracture internal fixing device that can be anti-rotation.
Background technology:
Internal fixation of fracture is an effective means of fractures.Used inner fixer mostly is screw at present, often will use several pieces of screws just can fix.And screw after squeezing in the bone easily loosening gradually or part withdraw from.Easily taking place mostly to be sufferers of osteoporosis face among the patient of fracture, the hold of its spongy bone double thread is less, so screw rotates or loosening phenomenon is more outstanding.
For example, to fracture of femoral neck, only squeeze into three pieces of screws and make it to be " product " font and arrange, could obtain the anti-rotation stability of maximum, 1 piece or 2 pieces of these screws all can not play firm fixation.Therefore in the internal fixation formula of fracture of femoral neck, the hollow screw of closed reduction, three pieces of half-threads is fixing to become " goldstandard ", but there are some inevitable shortcomings in this method:
At first, in tiny neck of femur, squeeze into the screw of 3 pieces of diameter 6-8mm, not only reduced the bone contact area of fracture end, and when operation be not for contacting 3 pieces of screws mutually, often need repeated multiple times to squeeze into the location guide pin, certain difficulty is arranged, and union of fracture is brought harmful effect;
Secondly, the boring procedure that every piece of screw is reached the last all can have losing of spongy bone amount in various degree, and for numerous senile osteoporosis patients, the loosening gradually easily or part of fracture healing process hollow core nail withdraws from, and needs secondary to take out.
Therefore, for the specification requirement of bone fracture internal fixing device, prevent rotation, oneself's locking, do not become flexible, and losing of spongy bone of minimizing is very important.
The international internal fixation association of Switzerland (AO) has released anti-rotation PFN and has treated intertrochanteric fracture, and this intramedullary pin has helical edges, has played certain anti-rotation effect.But this technology still is not suitable for the fracture at neck of femur or other position at present.
Summary of the invention:
The purpose of this invention is to provide a kind of anti-rotating self-locking bone fracture internal fixing device.
Anti-rotating self-locking bone fracture internal fixing device provided by the invention is made up of screw rod, sleeve and bolt, it is characterized by:
Screw rod comprises two sections, screw rod leading portion and screw rod back segment, the screw rod leading portion has helical edges, and screw rod back segment termination has the syndeton that links to each other with bolt one end, the screw rod back segment at least near the external diameter that is inserted in part of termination less than with the internal diameter of the contacted barrel forward end of screw rod; Bolt is placed in the sleeve, and screw rod and sleeve are connected as a single entity; Contact with the sleeve outer surface at position of bolt is provided with external screw thread, and the corresponding site of sleeve interior surface is provided with the female thread that is complementary with the bolt external screw thread; The other end of bolt is provided with taper hole; Sleeve has in the form of sheets the wing away from the outer surface of the end portion of the far-end of screw rod; Described screw rod back segment and sleeve are provided with the rotary stopper structure.
The annular groove that T shape gap that described syndeton comprises that the screw rod back segment has that cylinder termination, the termination of hollow have and hollow circuit cylinder inner surface have, described bolt has cylinder head and the cervical region that matches with this annular groove, and the size of described T shape gap is suitable for head and cervical region enters in this hollow circuit cylinder.
Described rotary stopper structure can have two kinds of modes: a kind of is that the screw rod back segment is provided with the ledge of diameter greater than the barrel forward end external diameter, and described ledge have one the circle groove, barrel forward end end face correspondence have one the circle groove.
The end face that another kind of rotary stopper structure is screw rod back segment termination is provided with a circle groove, and the inner surface correspondence at sleeve middle part has a circle groove.
In above-mentioned two kinds of rotary stopper structures, the groove number on screw rod back segment and the sleeve equates, and its size and concaveconvex shape match, can be engaged.Preferred first kind of design, because of its manufacturing comparatively convenient.
The connected mode of screw rod, sleeve and bolt is: after the head of bolt and cervical region embed screw rod back segment termination from described bindiny mechanism, insert sleeve, place the screw thread of the bolt body outer surface in the sleeve to contact with the screw thread of sleeve interior surface, swivel bolt, bolt can the two be connected with screw rod and sleeve in sleeve.When tightening built-in connecting bolt, the complete interlock of described groove, it is as a whole that sleeve and screw rod are closely connected into.
When connecting bolt was not exclusively tightened, holder was " release " state, and promptly screw rod can rotate freely in sleeve.In a single day bolt and sleeve are tightened fully, holder places " locking " state, and promptly screw rod, sleeve and connecting bolt become as a whole, make screw rod can not do any rotary moveable in sleeve.
During operation, the holder of released state (be that screw rod, sleeve and connecting bolt assemble, but under the state that bolt is not exclusively tightened) is squeezed into fracture end, tighten connecting bolt then, make holder become lock-out state.Simultaneously, in the form of sheets the wing has reliable anti-rotation effect on the sleeve, and after tighting a bolt, holder has auto-lock function, has limited its loosening withdrawing from bone.
Helical edges on the described screw rod can be 3～4;
The end of described helical edges is a spiral conehead shape, i.e. alleged " putting the first edge on a knife or a pair of scissors " structure of insider is conveniently to squeeze in the spongy bone.
The thickness of described screw rod can be inequality at two ends and middle part, makes corresponding change according to the situation of fracture site.As being used for femoral neck bone fixedly the time, screw rod is thicker in the part that helical edges is arranged, and screw rod back segment part is thinner, so that take minimum fracture site area when squeezing into neck of femur or other position.
The described telescopic wing is flat sheet-like, and preferred amount is 1～3, and the wing can play reliable anti-rotation effect in bone;
Described screw rod and bolt can be hollow tubuloses, can squeeze into holder under perspective along the location guide pin, have the operating feature of Wicresoft, and save material, make that whole holder weight is lighter;
The material of anti-rotating self-locking bone fracture internal fixing device provided by the invention can be selected metal materials such as rustless steel or titanium alloy for use.
Described anti-rotating self-locking bone fracture internal fixing device can be used for the fixedly abundant metaphysis fracture of spongy bone, is particularly useful for fracture of femoral neck.
Technique effect of the present invention:
Because be placed in lock-out state after helical edges is squeezed into bone, holder must just can withdraw from counter-rotating, and the flat wing of the axial traveling of sleeve part has limited the holder rotation, makes it to withdraw from;
The sleeve part has only axial craspedodrome to become flexible or to withdraw from, and whole locking rear screw blade branch can only rotate traveling, be impossible axially keep straight on, so the sleeve part also can't withdraw from, this anti-rotation self-lock function makes bone fracture internal fixing device significantly reduce probability loosening or that withdraw from.
Because the helical edges on the screw rod has 3～4, the cross section of the helical edges part of screw rod is bordering on triangle or tetragon, thus self have certain rotational stabilization, during the treatment fracture, only need 1 piece of holder can play the fixation that 3 pieces of half-thread hollow screws are played, operate simpler.
Carry out in the fracture of femoral neck treatment operation process, can directly squeeze into one piece of this anti-rotating self-locking bone fracture internal fixing device near end of thighbone, can play the effect of fixedly securing along keeping somewhere good guide pin, simple to operate, effect is clear and definite, and has significantly reduced screw loosening and the probability that withdraws from by auto-lock function.
Summary of benefits of the present invention is as follows:
1, bone fracture internal fixing device can not rotate in bone
Helical edges in the bone fracture internal fixing device of the present invention only has helical edges with after wing effect on the sleeve combines compared with prior art products, and anti-rotation effect is more reliable;
2, bone fracture internal fixing device has auto-lock function
Screw rod and sleeve have then had auto-lock function in case closely be connected with bolt, and anti-rotation and the two effect of self-locking combines, and have limited that holder is loosening to be withdrawed from, and are particularly useful for the fractures of sufferers of osteoporosis face;
3, reduce bone loss, be beneficial to union of fracture
Squeeze into and omitted this step of boring in the process, significantly reduce bone loss; Only squeeze into 1 holder and make the contact area of fracture end bigger than squeezing into three pieces of screws; And behind the implantation inner fixer, compacting around sclerotin, be equivalent to increase local bone density, help union of fracture;
4, simple to operate, operating time is short
Only need during the internal fixation operation of clinical fracture to squeeze into 1 piece of holder simply, not only can play the fixation of original three pieces of screws, shortened operating time simultaneously along the location guide pin.
Description of drawings:
Fig. 1～Fig. 8 is the anti-rotating self-locking bone fracture internal fixing device that screw rod back segment and sleeve end face have the treatment fracture of femoral neck of groove, and wherein: Fig. 1 is the schematic perspective view of screw rod; Fig. 2 and Fig. 3 are the schematic perspective view and the right views of built-in connecting bolt; Fig. 4, Fig. 5 and Fig. 6 are respectively telescopic schematic perspective view, longitudinal sectional view and the left views that has three wings; Fig. 7 is the schematic perspective view of holder under lock-out state; Fig. 8 is the schematic perspective view of holder under released state;
Fig. 9 and Figure 10 are in prior art " the three pieces of hollow nail fixed fracture of femoral neck " operation and the X-ray sheet of postoperative, and wherein: three pieces of hollow nails were positioned over the normal position when Fig. 9 was operation; After Figure 10 is operation a period of time, the situation that hollow nail becomes flexible, withdraws from;
Figure 11, Figure 12 are on the end face of screw rod back segment termination and the anti-rotating self-locking bone fracture internal fixing device of sleeve interior surface with treatment fracture of femoral neck of groove, and wherein: Figure 11 is that holder is squeezed into fracture site in the operation under released state; Figure 12 is lock-out state after holder is tightened built-in bolt, has fixed fracture site.
The specific embodiment:
Below in conjunction with the drawings and specific embodiments the present invention is elaborated.What embodiment provided is the anti-rotating self-locking bone fracture internal fixing device of two kinds of treatment fracture of femoral neck.
Fixer structure:
See accompanying drawing 1～8, the anti-rotating self-locking bone fracture internal fixing device structure is by screw rod shown in Figure 1, Fig. 2 and built-in connecting bolt shown in Figure 3, and Fig. 4, Fig. 5 and the sleeve that has three wings shown in Figure 6 form, three parts are hollow-core construction.
Screw portion has three helical edges 1, is used to squeeze in the femoral head, and the cephalic par of sword is the conehead shape in the shape of a spiral, and conveniently to squeeze in the spongy bone, the straight length of helical edges part is between the 15mm-30mm; Screw rod is thicker at the leading portion that helical edges is arranged, and screw rod back segment middle part is thinner, so that take minimum fracture site area when squeezing into neck of femur.The diameter of screw rod back segment part rear does not present the space for inserting sleeve just, and under the released state, the rear of screw rod back segment part can rotate freely in sleeve.
Hollow built-in connecting bolt is used for connecting screw rod and sleeve, and bolt is divided into thin slightly cervical region of head 4, diameter 5 and threaded bolt body three parts.Connecting bolt is a hollow, and breech face is hexagon taper hole 6, is used to insert six rib screwdrivers.
There is a "T"-shaped gap 3 screw rod back segment termination, be used for the head 4 of built-in connecting bolt and cervical region 5 are embedded through this gap, and herein on the inner peripheral surface of screw rod design fluted, the connecting bolt incidence can embed wherein just, bolt can rotate, but can not deviate from.After bolt head and cervical region were inserted screw rod back segment termination, the screw thread of bolt body surface was used for tightening with telescopic female thread, and the two is connected with screw rod and sleeve.
Also have a circle groove 2 on the screw rod back segment, the end face that sleeve does not have an end of the wing also has a circle groove 9, and the groove number of the two equates, and its size and concaveconvex shape match.When screw rod inserted sleeve, in case tighten built-in connecting bolt, described groove further made sleeve and the complete interlock of screw rod, can't rotate mutually between two parts, and it is as a whole that sleeve and screw rod are closely connected into.The flat wing 7 of three axial travelings on the sleeve can embed in the spongy bone of femoral trochanteric and/or the cortical bone and play certain anti-rotation effect.The smooth, curvilinear shape at the two ends of the wing 7 makes things convenient for it to squeeze in bone and extract.
2) operative process
1, the holder of assembling released state
Select the suitable anti-rotating self-locking bone fracture internal fixing device parts of length, after the head 4 of bolt and cervical region 5 inserted from screw rod T shape gap 3, insert sleeve again, through sleeve tail end swivel bolt, the screw thread of the bolt body surface in the sleeve is contacted with telescopic female thread, but not exclusively tight a bolt, see Fig. 8.This moment, bolt was positioned at sleeve.
2, location
After the fracture of femoral neck closed reduction is satisfied, the neck of femur axis on the lower side and the place partially squeeze into the location guide pin, parallelly above it squeeze into 1 piece and anti-ly revolve guide pin, so that prevent the femoral head rotation displacement in the process squeezing into of anti-rotating self-locking bone fracture internal fixing device.
3, squeeze into the holder of released state at fracture site
On skin, cut the long otch of a 1cm, along the location guide pin the above-mentioned release holder that assembles is squeezed into along the helical edges direction, to appropriate depth, promptly the head end of helical edges is positioned at articular surface below slightly, and the sleeve part tail end that has the wing 7 is stayed the tuberosity part cortical bone place of a little outward just.
4, holder is locked in bone
Insert with the supporting screwdriver of six ribs in the hexagon taper hole of afterbody of the connecting bolt that assembles with sleeve, tighten built-in connecting bolt, the screw thread of connecting bolt body and internal thread of sleeve 8 are tightened.Can produce certain fracture site pressurization in this process.Connecting bolt is tightened the groove of sleeve part, back end surface and the groove of the interior bar outer face of helical edges part just is interlocked, anti-rotating self-locking bone fracture internal fixing device integral body just becomes lock-out state by released state, and promptly helical edges part can not be rotated again, the sleeve part can not move axially again.
5, remove location guide pin, complete operation.
The anti-rotating self-locking bone fracture internal fixing device that has groove on the end face of embodiment 2 screw rod back segment terminations with sleeve interior surface
The end face that removes screw rod back segment and sleeve one end does not all have groove, and groove is on the end face of screw rod back segment termination and sleeve interior surface, and all the other structures are identical with embodiment 1.
In the operation, the holder of released state and lock-out state is seen Figure 11, Figure 12 respectively, because of groove in sleeve, do not present among the figure.
Claims (9)
1. anti-rotating self-locking bone fracture internal fixing device, form by screw rod, sleeve and bolt, it is characterized by: screw rod comprises two sections, screw rod leading portion and screw rod back segment, the screw rod leading portion has helical edges, screw rod back segment termination has the syndeton that links to each other with bolt one end, the screw rod back segment at least near the external diameter that is inserted in part of termination less than with the internal diameter of the contacted barrel forward end of screw rod; Bolt is placed in the sleeve, and screw rod and sleeve are connected as a single entity; Contact with the sleeve outer surface at position of bolt is provided with external screw thread, and the corresponding site of sleeve interior surface is provided with the female thread that is complementary with the bolt external screw thread; The other end of bolt is provided with taper hole; Sleeve has in the form of sheets the wing away from the outer surface of the end portion of the far-end of screw rod; Described screw rod back segment and sleeve are provided with the rotary stopper structure.
2, anti-rotating self-locking bone fracture internal fixing device according to claim 1, the annular groove that T shape gap that it is characterized in that described syndeton comprises that the screw rod back segment has that cylinder termination, the termination of hollow have and hollow circuit cylinder inner surface have, described bolt has cylinder head and the cervical region that matches with this annular groove, and the size of described T shape gap is suitable for head and cervical region enters in this hollow circuit cylinder.
3, anti-rotating self-locking bone fracture internal fixing device according to claim 1 and 2, it is characterized in that described rotary stopper structure is provided with the ledge of diameter greater than the barrel forward end external diameter for the screw rod back segment, and described ledge has a circle groove, and barrel forward end end face correspondence has a circle groove.
4, anti-rotating self-locking bone fracture internal fixing device according to claim 1 and 2 is characterized in that described rotary stopper structure is that the end face of screw rod back segment termination is provided with a circle groove, and the inner surface correspondence at sleeve middle part has a circle groove.
5. anti-rotating self-locking bone fracture internal fixing device according to claim 1 and 2 is characterized in that the helical edges on the described screw rod is 3～4.
6. anti-rotating self-locking bone fracture internal fixing device according to claim 1 and 2 is characterized in that described sleeve has 1～3 wing.
7. anti-rotating self-locking bone fracture internal fixing device according to claim 1 and 2 is characterized in that described screw rod and bolt are hollow-core constructions.
8. anti-rotating self-locking bone fracture internal fixing device according to claim 1 and 2, its material are rustless steel or titanium alloy.
9. the described anti-rotating self-locking bone fracture internal fixing device of claim 1 is used for the fixing of fracture of femoral neck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101219317A CN100500110C (en) | 2007-09-18 | 2007-09-18 | Anti-rotating self-locking bone fracture internal fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101219317A CN100500110C (en) | 2007-09-18 | 2007-09-18 | Anti-rotating self-locking bone fracture internal fixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101116635A CN101116635A (en) | 2008-02-06 |
| CN100500110C true CN100500110C (en) | 2009-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101219317A Expired - Fee Related CN100500110C (en) | 2007-09-18 | 2007-09-18 | Anti-rotating self-locking bone fracture internal fixing device |
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| CN (1) | CN100500110C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106420118B (en) * | 2016-11-24 | 2019-02-12 | 北京科仪邦恩医疗器械科技有限公司 | Rotaryproof middle-device and hip prosthesis comprising the middle-device |
| CN106725786A (en) * | 2017-03-03 | 2017-05-31 | 叶川 | Anti- rotation Kirschner wire |
| US11045238B2 (en) * | 2018-06-20 | 2021-06-29 | Life Spine, Inc. | Bone screw implant for sacroiliac joint fusion |
| CN111281512A (en) * | 2020-02-27 | 2020-06-16 | 天津市威曼生物材料有限公司 | Assembled proximal femur compression screw group |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2094323U (en) * | 1991-06-08 | 1992-01-29 | 张群策 | Pressured screw trifin nail |
| CN2121211U (en) * | 1992-02-27 | 1992-11-11 | 白求恩医科大学第一临床医学院 | Medical expanding bolt |
| US5306275A (en) * | 1992-12-31 | 1994-04-26 | Bryan Donald W | Lumbar spine fixation apparatus and method |
| US20010049528A1 (en) * | 1999-05-12 | 2001-12-06 | Kohei Kubota | Implant screw |
| CN2533315Y (en) * | 2001-09-30 | 2003-01-29 | 金太阳精密工业股份有限公司 | Expansion bolt |
| WO2004037110A1 (en) * | 2002-10-23 | 2004-05-06 | Max Mettler | Intraosseous dental implant and dental implant set |
| CN2657595Y (en) * | 2003-11-28 | 2004-11-24 | 侯庆忠 | Neck of femur auto-locking anti-rotor fixation screw with pressure screw |
| WO2007031132A1 (en) * | 2005-09-09 | 2007-03-22 | Aesculap Ag & Co. Kg | Screwdriver for bone screws |
| WO2007019252A3 (en) * | 2005-08-03 | 2007-05-03 | Hfsc Co | Screw-retaining screwdriver |
-
2007
- 2007-09-18 CN CNB2007101219317A patent/CN100500110C/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2094323U (en) * | 1991-06-08 | 1992-01-29 | 张群策 | Pressured screw trifin nail |
| CN2121211U (en) * | 1992-02-27 | 1992-11-11 | 白求恩医科大学第一临床医学院 | Medical expanding bolt |
| US5306275A (en) * | 1992-12-31 | 1994-04-26 | Bryan Donald W | Lumbar spine fixation apparatus and method |
| US20010049528A1 (en) * | 1999-05-12 | 2001-12-06 | Kohei Kubota | Implant screw |
| CN2533315Y (en) * | 2001-09-30 | 2003-01-29 | 金太阳精密工业股份有限公司 | Expansion bolt |
| WO2004037110A1 (en) * | 2002-10-23 | 2004-05-06 | Max Mettler | Intraosseous dental implant and dental implant set |
| CN2657595Y (en) * | 2003-11-28 | 2004-11-24 | 侯庆忠 | Neck of femur auto-locking anti-rotor fixation screw with pressure screw |
| WO2007019252A3 (en) * | 2005-08-03 | 2007-05-03 | Hfsc Co | Screw-retaining screwdriver |
| WO2007031132A1 (en) * | 2005-09-09 | 2007-03-22 | Aesculap Ag & Co. Kg | Screwdriver for bone screws |
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| Publication number | Publication date |
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| CN101116635A (en) | 2008-02-06 |
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