CN2326199Y

CN2326199Y - Carrier-type biomechanical internal fixer for thigh-bone cervical-bone fracture

Info

Publication number: CN2326199Y
Application number: CN 96220816
Authority: CN
Inventors: 魏兆文; 邓光荣
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-08-13
Filing date: 1996-08-13
Publication date: 1999-06-30
Anticipated expiration: 2006-08-13

Abstract

The utility model relates to a carrier-type biomechanical internal fixer for thigh-bone cervical-bone fracture. The utility model belongs to the field of an internal fixation apparatus of orthopaedics of clinical medicine. The utility model is composed of a buttonhole type pressurizing pull nail part and a support screw thread needle part. Under the assistance of a purpose-made orientation device, a supporting structure is precisely assembled in the bone of the femoral head, the neck and the stem, and the internal fixation can be completed. According to distribution directions of loading force lines of the femoral head, the neck and the stem of a normal human body and the kinetics variation generated by fracture, the supporting, pressing and fixing of a triangular and the lever equilibrium principles are adopted. The utility model imitates a biomechanics structure, and solves the problem of incompact contacting osteodiastasis of the bone fracture surface caused by tension and component force; the carrier-type biomechanical internal fixer also solves the problems of supporting and fixing a compression band and elimination of the shear force, and reconstruction of the load line. The loading of the neck part of the femoral head is dispersed and balanced, the cure rate is enhanced, and the incidence of osteonecrosis of the femoral head of the later stage is reduced.

Description

Fracture of femoral neck stent-type biomechanical inner fixer

This utility model: fracture of femoral neck stent-type biomechanical inner fixer belongs to clinical medicine, orthopedic fixation device material field.Partly form by buttonhole formula pressurization blind rivet and support screw needle two, under the assistance of special finder, in femoral head, neck, dried sclerotin, be combined as supporting structure exactly, finish internal fixation operation.The mechanical change that takes place with normal human's femoral head, neck, the distribution arrangement of doing the load line of force and fracture is a foundation, adopt triangular support and add press fit and lever balance theory, copy biomethanics structure, both solved that the bone section contacts untight osteodiastasis due to the component, the support fixation that has solved the compression band is again eliminated shearing force and is rebuild the negative G line, disperse and balance femoral head neck load all, improve cure rate.Reduce the incidence rate of later stage femur head necrosis.

At present, both at home and abroad in treatment fracture of femoral neck internal fixation process attention deflection fracture open separating belt as three wing nail, compression screw fixation, many draw points (many Kirschner wires, many screw needles) and the external at present neck of femur The Hansson Pin Systen (purl system) that carries out.Traditional fixation device and present technology have only solved the separation problem of fracture tension band, do not solve the support fixation of shearing force needs and the reconstruction problem of the heavy burden line of force, so curative effect is not good enough, capital necrosis rate of later stage descends little.

This utility model had both solved fracture of femoral neck and had opened component, solved shearing force again, utilize mechanics principle to rebuild the heavy burden line of force, conduction, dispersion, balance femoral head and neck load intensity design at treating the unreasonable of fracture of femoral neck internal fixation apparatus both at home and abroad at present.

According to the analysis that is had, the home and abroad does not have the fixation device and the patent application of same structure at present.

The purpose of this utility model: provide the distribution arrangement of a kind of imitative normal human's biomethanics structure and the femoral head and neck load line of force and the conduction of power and disperse approach consistent, fix, the novel fracture of femoral neck stent-type internal fixation device of operating accuracy height, novelty, practicality, good effect, biomechanical.

The purpose of this utility model realizes by following structure.

Fracture of femoral neck stent-type biomechanical inner fixer pressurizes blind rivet (1), support screw needle (2) two partly under the assistance of special finder (3) by the buttonhole formula, in femoral head, neck, dried sclerotin, be combined as supporting structure exactly, finish internal fixation operation.Buttonhole formula pressurization blind rivet (1) and support screw needle (2) are all made with medical stainless steel, titanium steel or titanium alloy material, and special finder (3) available metal or nonmetallic materials are made.Buttonhole formula pressurization blind rivet (1) and support screw needle (2) form stent-type biomechanical internal fixation structure after making up, special finder (3) is to guarantee buttonhole formula pressurization blind rivet (1) and support the key steering tool that screw needle (2) accurately is combined into the inner fixed support structure.

Buttonhole formula pressurization blind rivet (1) nail body branch: head, in, tail three parts, the head garden is blunt, there are buttonhole (4), (4) to be microscler inclined hole, connect nail body both sides up and down, following wide, upward narrow, it is trapezoidal that cross section is, the handle (6) that afterbody has screw thread (5) and can fracture and discard, smooth smooth, the transversal section in middle part can be garden shape, square and other shape, and whole nail body can be entity column or hollow tubular, and the nail body has scale (7) and Directional Sign (8).Support screw needle (2) and be the garden strip, needle point (9) is elongated to be taper, afterbody and to have convex thread (10) tail end and be hexagon, square, triangle or other form, and needle body indicates scale (7).

Special finder (3) divides standing part (11) and guiding partly (12), and two partly are connected as one with frame for movement, and standing part (11) has fixedly salient point (13), fixing hole (14), upper end bending.Guiding partly (12) can adjusting angle and needle gage, and has the directed guide hole (hole abbreviations on) (15) of tension band and directed guide hole (abbreviation time hole) (16) is with in compression, (15), the inside extended line focus in (16) two guide hole normotopias and side position meets with point in the femoral head sclerotin, special finder also has drill bit location reinforced hole (17).

During operation technique, can be through the preceding outside, the outside or posterolateral approach, expose femoral trochanteric and backbone, in position settle and fixing special finder, temporary fixed with getting Kirschner wire after the reduction of the fracture, be with directed guide hole internal drilling to reach under the femoral head cortical bone at tension band and compression respectively, insert buttonhole formula pressurization blind rivet more respectively and support screw needle, the elongated taper of needle point (9) is partly inserted run through buttonhole (4), make nail, the pin combination, have an X-rayed in the art or follow closely with the ad hoc approach inspection, after pin combination is errorless, adjusts and support the screw needle depth of needle, add nut then and tighten pressurization and promptly finish operation.

Below with reference to accompanying drawing this utility model is further described:

Fig. 1, be this utility model structural grouping floor map.

Fig. 2, be this utility model structural grouping side schematic view.

Fig. 3, be this utility model STRUCTURE DECOMPOSITION profile sketch map.

Fig. 4, be the special finder side position cross-sectional schematic of this utility model.

Fig. 5, be normal human's femoral head, neck, cadre's mechanics conduction orientation, distribution and common fracture of femoral neck internal fixation method sketch map both at home and abroad at present.

With reference to Fig. 1, buttonhole formula pressurization nail (1), support screw needle (2).

With reference to Fig. 2, buttonhole formula pressurization nail (1), support screw needle (2).

With reference to Fig. 3, buttonhole formula pressurization nail (1), support screw needle (2), buttonhole (4), screw thread (5), handle (6), scale (7), Directional Sign (8), needle point (9), convex thread (10).

With reference to Fig. 4, special finder (3), standing part (11), targeting part (12), fixedly the hole gone up in salient point (13), fixing hole (14), directed guide hole (15) abbreviations of tension band, compression is with directed guide hole (16) abbreviation to descend the hole.

With reference to Fig. 5, Fig. 5 compared to Figure 1, help principle of the present utility model, structure has clearer understanding.

Claims

1, a kind of fracture of femoral neck stent-type biomechanical inner fixer, it is characterized in that inner fixer pressurizes blind rivet (1), support screw needle (2) two parts under the assistance of special finder (3) by the buttonhole formula, is combined as stent-type biomechanical internal fixation structure exactly in femoral head, neck, dried sclerotin.

2, fracture of femoral neck stent-type biomechanical inner fixer according to claim 1, it is characterized in that buttonhole formula pressurization nail (1) nail body branch: head, in, tail three partly, the head garden is blunt, there are buttonhole (4), (4) to be microscler inclined hole, connect the upper and lower both sides of nail body, low wide and up narrow, it is trapezoidal that cross section is, the handle (6) that afterbody has screw thread (5) and can fracture and discard, the transversal section in middle part can be garden shape, square or other shape, whole nail body can be entity column or hollow tubular, and the nail body has scale (7) and Directional Sign (8).

3, fracture of femoral neck stent-type biomechanical inner fixer according to claim 1, it is characterized in that supporting screw needle (2) and be the garden strip, the elongated taper that is of needle point (9), afterbody has convex thread (10), tail end and is hexagon, square, triangle or other form, and needle body indicates scale (7).

4, fracture of femoral neck stent-type biomechanical inner fixer according to claim 1, it is characterized in that special finder (3), divide fixed part (11) and guiding partly (12), two partly with the continuous one of frame for movement, and partly (12) can adjusting angle and needle gage for guiding.

5, fracture of femoral neck stent-type biomechanical inner fixer according to claim 1 is characterized in that the standing part (11) of special finder (3) has fixedly salient point (13), fixing hole (14), upper end bending.

6, fracture of femoral neck stent-type biomechanical inner fixer according to claim 1, the targeting part (12) that it is characterized in that special finder (3) have the directed guide hole (15) of tension band and directed guide hole (16) is with in compression.

7, fracture of femoral neck stent-type biomechanical inner fixer according to claim 1, it is characterized in that the directed guide hole (15) of tension band of special finder and compression with directed guide hole (16) two guide hole normotopias and side position inwardly the extended line focus of side in the femoral head sclerotin with the some gathering.

8, fracture of femoral neck stent-type biomechanical inner fixer according to claim 1 is characterized in that special finder also has drill bit location reinforced hole (17).