CN2453862Y - Marmen shrink-fit type intralaminar nail - Google Patents
Marmen shrink-fit type intralaminar nail Download PDFInfo
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- CN2453862Y CN2453862Y CN 00262449 CN00262449U CN2453862Y CN 2453862 Y CN2453862 Y CN 2453862Y CN 00262449 CN00262449 CN 00262449 CN 00262449 U CN00262449 U CN 00262449U CN 2453862 Y CN2453862 Y CN 2453862Y
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Abstract
The utility model relates to a special apparatus used for internally fixing a bone fracture part of a tubular bone in an orthopedics operation. The utility model has an effect on shape memory. The utility model is composed of an outside nail and an inside nail which can be mutually combined. The proximal ends of the outside nail and the inside nail are respectively provided with an interlocking screw hole and an extracting device hole. The distal ends of the outside nail and the inside nail are respectively provided with an outside bending part which faces to a junction surface. The junction surfaces of the inside nail and the outside nail are respectively provided with two sections of structures, and the inside nail and the outside nail can be mutually embedded through the two sections of structures, wherein, one section of embedded structure is positioned at the proximal ends of the inside nail and the outside nail, and the other embedded structure is positioned at the distal ends of the inside nail and the outside nail. After the inside nail and the outside nail move, the embedded structure positioned at the proximal ends can be free from the embedded state to make the end parts of the inside nail and the outside nail not limited with each other.
Description
This utility model relates to the equipment special that is used for tubular bone fracture is partly carried out internal fixation in a kind of bone surgery.This equipment is the intramedullary pin that is arranged at pulp cavity inside, along nail vertically have certain camber, be provided with the inter-locking screw hole nailing on.
Intramedullary pin is to adopt a kind of pulp cavity inside equipment that fracture site is carried out internal fixation that is arranged at modern age.The multiplex stainless steel material manufacturing of existing intramedullary nail.For fixing in realizing carrying out reliably with intramedullary nail to fracture site, simultaneously for the restriction knochenbruch longitudinally displacement and around the rotation of axis, near-end and far-end along the intramedullary nail of stainless steel are provided with the inter-locking screw hole, with the inter-locking screw that passes the screw hole on knochenbruch and the intramedullary nail with the constraint of knochenbruch and intramedullary nail and fixingly (see " fixing in the intramedullary nail " front cover, sieve is just waiting earlier work, the People's Health Publisher publishes, October in 1997 the 1st edition).But have like this some problems in the prior art, 1) be difficult to accurately determine the inter-locking screw hole site on the intramedullary nail that is positioned at the knochenbruch distal site in sufferer limbs outside, bring suitable difficulty to surgical procedure; 2) this operation needs at patient part increase surgical wound; 3) use intramedullary nail to carry out interior fixing owing to the reasons such as operative site also may limit, for example an end of patient part can't be settled self-locking nail.
Because development of technology has a considerable amount of intramedullary pins and adopted the marmem manufacturing,, also adopted the intramedullary pin technique for fixing of marmem simultaneously comparatively widely at orthopaedics in recent years as the intramedullary pin of Ni-Ti alloy.Existing this its near-end of class marmem intramedullary pin has the inter-locking screw hole, its far-end longitudinally has certain camber, be that two intramedullary pins that have camber are aligned under cold conditions earlier in use, the intramedullary pin that to align is squeezed in the pulp cavity respectively again, and the original camber of two nails is placed by opposite direction, again according to the concrete condition of knochenbruch, with inter-locking screw two intramedullary pins are fixed at the near-end of patient part, the far-end that is driven into two intramedullary pins of pulp cavity undergoes phase transition under the effect of body temperature, recover its original shape simultaneously, the far-end of its nail produces opposite curvature and its end is separately acted in the pulp cavity, by the intramedullary pin end pulp cavity inwall is produced active force thus, the effect of rotation of constraint knochenbruch and displacement of having played (is seen " intramedullary pin internal fixation " P.29 Fig. 1-5-6, sieve is just waiting earlier work, the People's Health Publisher publishes, October in 1997 the 1st edition).But also there is a deficiency in existing intramedullary pin, promptly in the operation process of intramedullary pin being squeezed in the pulp cavity, the marrow nail will be subjected to the effect of body temperature at patient part, deformation too early, cause the pronged of the two marrow nails of squeezing into to act on the pulp cavity inwall, produce the extra resistance of motion, make nail can't continue to squeeze into pulp cavity inside, even produce accident surgery.Secondly, relatively higher with the cost of marmem manufacturing intramedullary nail.
The purpose of this utility model provides and a kind ofly can overcome the prior art deficiency, can avoid in intramedullary pin is squeezed into the operation process of pulp cavity most advanced and sophisticated distortion taking place too early, brings the intramedullary pin of disadvantage such as additional movements resistance.
Intramedullary nail of the present utility model is by outside nail and the inboard nail of fit form mutually, and outside nail and inboard the nail along its longitudinal direction with certain camber, end at outside nail and inboard nail respectively is provided with inter-locking screw hole corresponding to mutual alignment and the instrument hole of choosing, the far-end in the hole of choosing of outside nail and inboard nail (annotate: herein near-end and far-end all with the apparatus pitch-row of choosing that nails on from determining) at least one section each part to the outside curve of its faying face arranged respectively, faying face that follow closely in the outside and the inboard nail is respectively equipped with two sections can be with structure mutual chimeric between the nail of the interior outside, wherein one section embedded structure is positioned at the near-end that follow closely in the outside, and another chimeric structure only is arranged at the end of interior outside nail far-end, and after interior outside nail produces mutual displacement, described far-end embedded structure can be freed chimeric, is free from each other between the end that the interior outside is followed closely.This utility model both can be used the marmem manufacturing, also can make with titanium alloy or rustless steel elastomeric material,
At least two sections embedded structures between inboard described in the utility model nail and outside nail can be to be arranged at respectively the T shape projection on the nail faying face of the interior outside and the T-slot that matches with it, or the each other projection of other chimeric type and the groove that matches.
A kind of embodiment of the present utility model is the embedded structure that swallow-tail form projection and dovetail groove are set at the faying face of interior outside nail near-end respectively, and the embedded structure of another section swallow-tail form projection and dovetail groove is set in the part, end of inboard nail and outside nail far-end faying face.
When the utility model is when making with marmem, under cooling condition, outside nail and inboard are followed closely aligning earlier in use, make again the interior outside nail between near-end and far-end embedded structure mutually chimeric (as will swallow-tail form projection cooperatively interact with dovetail groove) make interior outside nail fit as a whole, will be squeezed in the pulp cavity by interior outside nail fit and the intramedullary nail that has become " integral body " again.Though intramedullary pin is subjected to the effect of patient temperature in the process of it being squeezed into pulp cavity, but because the interlocked of the embedded structure that the outside nails in being located at is used, particularly be positioned at the mutual locking action of the embedded structure of outside nail far-end, outside nail can not recover its original curved shape in making.Enter the interior difficulty of pulp cavity with regard to the intramedullary nail of having avoided prior art like this.After intramedullary nail of the present utility model is placed in the pulp cavity really allocation, make mutually displacement between outside nail and inboard nail, interior outside nail far-end embedded structure is separated, remove mutual locking, this moment, outside nail and inboard nail namely produced distortion under the phase transformation effect, recover original case of bending, and end is separately acted on mutually with the pulp cavity inwall, form marrow nail fixing in the pulp cavity far-end.
If the utility model is made with titanium or stainless steel elastomeric material, can make the bending section on it produce strain with external force earlier in use, utilize then embedded structure set on it by force with interior outside nail fit, and it is squeezed in the pulp cavity.After intramedullary nail of the present utility model is placed in the pulp cavity really allocation, make mutually displacement between outside nail and inboard nail, the embedded structure of interior outside nail far-end is separated, remove mutual locking, outside nail and inboard nail can recover to produce recovery under the resilient force, form original case of bending, and end is separately acted on mutually with the pulp cavity inwall, form marrow nail fixing in the pulp cavity far-end.
An embodiment of the present utility model nails in the outside dovetail groove is set, establish two sections dovetail tangs and nail in the inboard, and between two sections swallow-tail form projectioies, be provided with one section orthogonal projection, and the rectangular preiection that the inboard nails on and the swallow-tail form projection at its two ends all can in nailing on set dovetail groove, the outside be slided.Can be to nail in the inboard again one section dovetail of intermediate portion part to be removed after processing earlier a complete swallow-tail form projection from its manufacture method, form rectangular preiection.
The end of the hole distal outer of choosing of the outside of the present utility model nail and inboard nail preferably is provided with the guide section of inside contraction, is beneficial to penetrate in the pulp cavity in operation.
Cross section at the fit state of the present utility model can be a rectangle, also can be cloverleaf pattern or trough of belt cross section shape, so that the utlity model has bigger cross sectional moment of inertia.
The utlity model has following advantage:
1, because structure of the present utility model, make it in entering pulp cavity, have the function of mutual locking, it can not be deformed when entering pulp cavity too early, the deficiencies in the prior art have been overcome fully, the additional movements resistance that no longer occurs deforming in advance when intramedullary pin enters pulp cavity and cause, reduce the operation difficulty, shortened operating time, improved the success rate of operation;
When 2, when the binding portion employing dovetail groove of the inboard nail of the utility model and outside nail with at the two ends of one section rectangular preiection the structure of two sections swallow-tail form projections being arranged, can reduce on the one hand the difficulty of processing of parts, the projection of rectangle itself can also strengthen the cross sectional moment of inertia of inboard nail on the other hand, increases bending resistance and the torsional strength of marrow nail;
3, because the inboard of intramedullary pin of the present utility model nail and outside nail have acting surface close to each other, both faying faces just, intramedullary pin can produce the active force bigger than prior art when recovering deformation like this, so it can have better internal fixation effect;
4, when front end of the present utility model is provided with guide section, can be more easy and laborsaving at the operation process of the marrow nail being squeezed into pulp cavity;
5, using intramedullary nail of the present utility model only needs to open a wound at the sufferer limbs in operation, says in a sense and can simplify operation, alleviates the patient suffering, and wound is comparatively fast healed;
6, this utility model cross section is a rectangle, or cloverleaf pattern, or during the shape of trough of belt cross section, can be so that nail body itself has higher cross sectional moment of inertia, can between nail body and pulp cavity, reserve corresponding space again, in order to blood circulation system recovery and the hypertrophy in the marrow, quicken the growth and the healing of knochenbruch;
7, because this utility model can be without the marmem manufacturing, but have the effect of " original form memory " equally, and its manufacturing cost can be lower, these characteristics are that prior art is beyond one's reach.
Description of drawings
Fig. 1 is at the sketch map of a kind of embodiment of the present utility model under user mode.Fig. 2 be among Fig. 1 A-A to cutaway view, Fig. 3 be with the swallow-tail form projection the schematic diagram of inboard nail, the part that represents with double dot dash line in the drawings is the part of inboard nail through " aligning " after, and the part that solid line represents is followed closely shape when carrying out the original form after the in advance heat treatment or strain not taking place for the inboard.Fig. 4 be among Fig. 3 B-B to cutaway view, i.e. swallow-tail form bossing.Fig. 5 be among Fig. 3 C-C to cutaway view, i.e. rectangular preiection part.Fig. 6 is the sketch map of locating the side nail that has dovetail groove, the part of representing with double dot dash line is the part of interior hand hay cutter nail through " aligning " after in the drawings, and the part that solid line is represented is followed closely shape when carrying out the original form behind the heat treatment in advance or strain not taking place for the inboard.Fig. 7 be among Fig. 6 D-D to cutaway view.Fig. 8 and Fig. 9 are respectively the sectional schematic diagram that this utility model profile is cloverleaf pattern and multiple-grooved cross section shape embodiment.
Below in conjunction with description of drawings.
The embodiment that accompanying drawing 1 to Fig. 7 provides.If adopt the manufacturing of Ni-Ti marmem, should carry out corresponding heat treatment in advance, make interior outside nail far-end respectively with the part of the outside curve of oriented its faying face.If adopt titanium or rustless steel manufacturing, the inboard should be followed closely far-end and directly make crooked part.Its bending radius is about 150 millimeters in the present embodiment, certainly can process according to relevant requirement the sweep of different radii in the application of reality.As seen from the figure, be positioned at the outside and nailed on the corresponding inter-locking screw of instrument hole 3,13 and the position hole 4,5 and 14,15 of choosing.And interior outside nail its near-end when fit is chimeric by dovetail and swallow groove, referring to Fig. 2.Present embodiment its transverse section when the state of fit assembling is a rectangle.
The inboard nail of present embodiment is provided with one section swallow-tail form projection 9 at its near-end, is provided with another section swallow-tail form projection 10 in the part, end of its far-end, referring to Fig. 3, Fig. 4.The length of swallow-tail form projection 10 is about 10 millimeters in the present embodiment.Between aforesaid two sections swallow-tail forms projection 9 and 10, one section rectangular projection 11 is arranged, see Fig. 5.In addition as seen from the figure, at inboard nail far-end crooked part is arranged.The outside that is also shown in the far-end of inboard nail from figure is provided with the guide section 12 of inside contraction.
The outside of present embodiment nails on and is provided with dovetail groove 8, referring to Fig. 6 and Fig. 7.The outside that is also shown in the far-end of outside nail from figure also is provided with the guide section 16 of inside contraction.
Swallow-tail form that the present embodiment inboard nails on projection 9 and 10 and the projection 11 of rectangle all can in the dovetail groove 8 that the outside nails on, slide.
The cross-sectional view of accompanying drawing 8 and 9 given intramedullary pins is respectively to present cloverleaf pattern and trough of belt cross section shape, and obviously, so the intramedullary pin in cross section has bigger cross sectional moment of inertia, can strengthen the counter-bending and antitorque commentaries on classics of intramedullary pin.
Below the relevant art effect is used and produced to summary with the intramedullary pin of marmem manufacturing.
Suitable patient's that earlier will be through choosing outside nail and inboard nail are placed in the cold medium through sterilization, after outside nail and inboard nail cooling, will align separately, again that outside nail and the inboard dovetail groove that nails on and dovetail and the mutual fit of rectangular preiection is standby, should really make the swallow-tail form projection that the is positioned at inboard nail front end locking that matches with the dovetail groove that follow closely in the outside this moment.To squeeze in the pulp cavity of patient part through aforementioned ready intramedullary pin.Arrive the position of requirements of operation at intramedullary nail after, nail or inboard nail vertically slightly applies external force laterally, make between the two along its vertically do movement among a small circle, the dovetail 10 of inboard nail front end is taken off from the dovetail groove 8 of outside nail, this moment, outside nail was disengaged in the mutual constraint of its far-end with inboard nail, memorial alloy undergoes phase transition under the effect of suffering from the limbs temperature, recover original-shape, its front end namely acts on the pulp cavity inwall, fixing in forming, carry out outer fixing at near-end by inter-locking screw, or do not carry out outer fixing according to the requirement of operation, thereby finish the fixing operation of intramedullary nail.After the healing of patient part knochenbruch, use the exenterate inter-locking screw, colluding any set hole 3 or 13 in outside nail or the inboard nail with apparatus again, one of them is pulled out pulp cavity, use the same method again and can take out another sheet marrow nail.
When this utility model is made with titanium or stainless steel material elastomeric material, only need apply external force in the application earlier and make inboard nail and outside nail produce strain, and with both mutual fits.Thereafter operation and effect are to aforementioned similar.
In the present embodiment, be to nail in the outside dovetail groove is set, and nail on the rectangular preiection that the swallow-tail form projection is set in the inboard, certainly, in application, also can change swallow-tail form projection and dovetail groove into T shape projection and T-slot with matching.If with the inboard nail on arrange one from near-end T shape projection or the swallow-tail form projection to far-end, and T-slot or dovetail groove that the outside nails on are made two sections, one section T-slot of near-end system or the dovetail groove namely followed closely in the outside, at another section of its far-end system T-slot or dovetail groove, also can form other embodiment of the present utility model.
Claims (7)
1, the nested intramedullary pin of a kind of shape memory, longitudinal direction along nail has certain camber, be provided with the inter-locking screw hole nailing on, it is characterized in that this utility model is by the outside nail and the inboard nail of fit are formed mutually, wherein the end at outside nail and inboard nail is provided with the inter-locking screw hole of mutual alignment correspondence and the instrument hole of choosing separately, far-end in outside nail and the inboard instrument hole of choosing of following closely has each part to the outside curve of its faying face respectively, be respectively equipped with on the faying face of outside nail and inboard nail two sections can be with interior outside nail between mutual chimeric structure, wherein one section embedded structure is positioned at the near-end that follow closely in the outside, and another embedded structure only is arranged at the end of interior outside nail far-end, and after producing mutual displacement between the nail of the interior outside, the embedded structure that is positioned at far-end can be freed chimeric, is free from each other between the far-end of outside nail in making.
2, the nested intramedullary pin of shape memory according to claim 1, it is characterized in that on the faying face of inboard nail and outside nail near-end, being provided with respectively the embedded structure of swallow-tail form projection and dovetail groove, and the embedded structure of another section swallow-tail form projection and dovetail groove is set in the part, end of inboard nail and outside nail far-end faying face.
3, according to the described Marmen shrink-fit type intralaminar nail of claim 2, it is characterized in that nailing in the inboard and be provided with projection one section rectangle and that can in the outside nails on set dovetail groove, slide between two sections set dovetail tangs.
4, according to claim 1 or 2 or 3 described Marmen shrink-fit type intralaminar nails, it is characterized in that outside nail and the distal outer in the hole of choosing of inboard nail all have the guide section of inside contraction.
5, Marmen shrink-fit type intralaminar nail according to claim 4 is characterized in that the cross section after outside nail and the inboard nail combination is rectangular.
6, Marmen shrink-fit type intralaminar nail according to claim 4 is characterized in that the cross section after outside nail and the inboard nail combination is cloverleaf pattern.
7, Marmen shrink-fit type intralaminar nail according to claim 4 is characterized in that the cross section after outside nail and the inboard nail combination is band slot cross-section shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00262449 CN2453862Y (en) | 2000-11-29 | 2000-11-29 | Marmen shrink-fit type intralaminar nail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00262449 CN2453862Y (en) | 2000-11-29 | 2000-11-29 | Marmen shrink-fit type intralaminar nail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2453862Y true CN2453862Y (en) | 2001-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00262449 Expired - Fee Related CN2453862Y (en) | 2000-11-29 | 2000-11-29 | Marmen shrink-fit type intralaminar nail |
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| Country | Link |
|---|---|
| CN (1) | CN2453862Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102631238A (en) * | 2011-02-10 | 2012-08-15 | 财团法人金属工业研究发展中心 | Medical equipment with modularized intramedullary nail and intramedullary nail |
| CN110422314A (en) * | 2019-09-04 | 2019-11-08 | 吉林大学 | It can front and back deformation Bionic flexible wing |
-
2000
- 2000-11-29 CN CN 00262449 patent/CN2453862Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102631238A (en) * | 2011-02-10 | 2012-08-15 | 财团法人金属工业研究发展中心 | Medical equipment with modularized intramedullary nail and intramedullary nail |
| CN102631238B (en) * | 2011-02-10 | 2015-05-27 | 财团法人金属工业研究发展中心 | Medical equipment with modularized intramedullary nail and intramedullary nail |
| CN110422314A (en) * | 2019-09-04 | 2019-11-08 | 吉林大学 | It can front and back deformation Bionic flexible wing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |