CN2472682Y

CN2472682Y - Internal fixer for femoral fracture

Info

Publication number: CN2472682Y
Application number: CN 01238902
Authority: CN
Inventors: 黄群成
Original assignee: Shanghai Jiading Nanxiang Hospital
Current assignee: Shanghai Jiading Nanxiang Hospital
Priority date: 2001-04-17
Filing date: 2001-04-17
Publication date: 2002-01-23
Anticipated expiration: 2011-04-17

Abstract

The utility model relates to an inner fixer which is applied in the thighbone intertrochanteric thrypsis use. Because adopting the nickel-titanium shape memory alloy as the material and designing the hook nail shape armor plate and the radiation shape steel nail so as to make the fracture surface has bigger crushing stress and better fixing effect, the utility model not only effectively prevents the coxa enstrophe, but also provides best dynamics environment to the healing of the fracture. The utility model has simple and convenient method which is easy to be popularized.

Description

A kind of inner fixer that is applied to Fracture of femur

This utility model relates to a kind of medical apparatus and instruments, particularly relates to a kind of inner fixer of being made up of hook nail steel plate and steel nail that is used for intertrochanteric fracture of the femur.

Clinically, because the femoral intertrochanteric comminuted fracture is very unstable, if there is not strong, reliable internal fixation, cause in the future coxa vara easily, the limb function is suffered from influence, the internal fixation device that the employing carbon steel material of general normal use is at present made still can not be accomplished very satisfied, for example uses Richard (Richard) nail, and wound is bigger when the rotation of the near-end that then can not prevent from effectively to fracture and operation; As use gamma nail to fix, and though can bear bigger compressive stress, can not effectively tensile stress be converted into compressive stress, and operation is complicated, higher to equipment requirements, difficult this hands art of implementing of basic hospital; As use many pieces of hollow screw groups and An Dashi (Eender) nail, can not reach the requirement of strong internal fixation again.Design a kind of new Fracture of femur internal fixation device and become the very urgent thing of medical profession.

The purpose of this utility model is to design and a kind ofly can prevents that coxa vara has again and can bear strong compressive stress and tensile stress is converted into the internal fixation device of compressive stress, and requires easy and simple to handlely, is easy to promote the use of.

This utility model is made up of hook nail steel plate and steel nail two parts, at first, this utility model selects for use niti-shaped memorial alloy to make material, niti-shaped memorial alloy is a kind of metal material with memory function, under a certain low temperature, use external force can produce certain deformation, can revert to the shape of original (before the distortion) when waiting to be elevated to a certain temperature automatically; Secondly this alloy-steel plate is made a strip hook nail steel plate 3, the shape of this steel nail hook plate 3 must be close to femur and greater trochanter outer rim, the upper end jag of hook nail steel plate 3 and in curve two pointed hook nails 1 left large and right small and 2, the bill of big hook nail 1 and little hook nail 2 is in order to be fixed to the base of nebk ot femur pears shape nest of greater trochanter, pulverize the tensile stress of part to bear femur, help closely connected all the time fracture end, hook nail steel plate 3 is 210-230 millimeters of relative lengths, 15-20 mm wides, 1.5 the rectangular steel plate of-5 millimeters thick, divide big, in, little third gear length, to adapt to the needs of different crowd, 6-8 borings 4 are arranged in the steel plate axis, be used for fixing the usefulness of steel nail, steel nail divides main nail a, auxilliary nail b and plate nail c, general 7-12 centimetres of the length of main nail a, 6-8 millimeters of diameters, auxilliary nail length is generally 6-10 centimetres, 4-6 millimeters of diameters; Plate nail length is generally 3-6 centimetres, 4-6 millimeters of diameters, each steel nail afterbody is all made divergent shape with marmem, consider that the human femur under loading shape is symmetrical, so it is little that the pointed hook nail of hook nail steel plate 3 of the present utility model also can be made a right big left side, during clinical practice, the pointed hook nail position of the hook nail steel plate 3 after sterilization is put into frozen water and is lowered the temperature, when zero centigrade, big hook nail 1 and little hook nail 2 can strut radian, make whole hook nail steel plate 3 be close to femur, hook nail 1 and hook nail 2 are close to femoral greater trochanter, make the nail point of hook nail 1 and hook nail 2 be fixed to the base of nebk ot femur pears shape nest of greater trochanter, when treating that temperature is elevated near body temperature, hook nail steel plate 3 promptly automatically restores to primary shape, this recovers the restoring force of original-shape, played fixedly pressurization to fracture end, make the pressurized segment of hook nail 1 and hook nail 2 be in the vantage point of antagonism fracture portions tensile stress, main nail a, auxilliary nail b, make divergent shape with the afterbody of plate nail c, collapsible under the frozen water temperature, main nail a inserts neck of femur and is close to the femur square, auxilliary nail b inserts the little tuberosity of femur, plate nail c inserts femoral shaft, along with temperature raises, afterbody promptly scatters and is returned to the original shape of dispersing, tightly fixing fracture portions and hook nail steel plate 3, together fracture portions is played pressurization with hook nail 1 and hook nail 2, guarantee that whole fracture face all is under certain compression stress, for union of fracture provides best mechanical environment.And can effectively avoid femoral head rotation and the odd-shaped generation of coxa vara, this utility model can be made into the series specification of different size under the identical situation of shape, use to adapt to multiple crowd such as men and women, adult, child.

Advantage of the present utility model is:

1, internal fixation is strong: this hook nail steel plate is owing to have unique design, femur, steel nail, hook nail steel plate can be constituted an overall fixed, and overcome owing to move on the greater trochanter fracture, sequela such as gluteus medius tension force reduction, formed very strong internal fixation, but patient's early recovery limb function reduces the generation of fracture sequelae.

2, buckle curved plate overcomes the tensile stress of fracture site effectively, tensile stress is converted into the compressive stress that helps union of fracture, thereby avoids taking place the coxa vara deformity.

3, this utility model adopts steel nail to fix, and general screw can prevent that femoral head, neck of femur from being cut by screw thread, and main steel nail a that neck of femur is interior and the head of auxilliary steel nail b are divergent shape, have the torsion proof effect, prevent capital rotation.

4, memorial alloy has prestressing force, and fracture site is played the persistent pressure effect, promotes fracture heals in early days.

5, operation comparatively easy, be easy to use, do not need complicated instrument and equipment, vast basic hospital all can be carried out.

Provide embodiment of the present utility model below in conjunction with accompanying drawing:

Fig. 1 hook nail steel plate shape sketch map;

The sketch map that cooperates of Fig. 2 hook nail steel plate and steel nail;

Fig. 3 this utility model application example sketch map;

Embodiment:

The inner fixer that is applied to the adult male intertrochanteric fracture of the femur that a kind of application of nickel titanium shape memory alloy is made, each parameter is as follows: steel plate thickness=2.5 millimeter, steel plate width=15 millimeter, 230 millimeters of relative lengths, main nail a=90 millimeter * Φ 6, shop nail b ₁=60 millimeters * Φ 4, b ₂=50 millimeters * Φ 4, plate nail c ₁=c ₂=c ₃=c ₄=35 millimeters * Φ 4

Claims

1, a kind of inner fixer that is applied to intertrochanteric fracture of the femur is characterized in that main nail a, auxilliary nail b, plate nail c that hook nail steel plate 3 that it is made by niti-shaped memorial alloy and niti-shaped memorial alloy are made form;

2, holder according to claim 1 is characterized in that described hook nail steel plate 3 is strip steel plates of being close to femur outer rim shape, and 6-8 holes are occupied in the axis;

3,1 described inner fixer as requested, it is characterized in that described hook nail steel plate 3 the upper end jag and in curve the little hook nail 2 of the big hook nail 1 in the left side and the right, also can make big hook nail 1 in the right and the little hook nail 2 in the left side;

4, inner fixer according to claim 1 is characterized in that the afterbody of described main nail a, auxilliary nail b, plate nail c is divergent shape;