CN200998304Y

CN200998304Y - Locking dynamic hip joint screw nail

Info

Publication number: CN200998304Y
Application number: CNU2007200892377U
Authority: CN
Inventors: 王天旭; 李兴华; 王翔宇; 张毅; 崔杰; 王嵩峰; 牛培君
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-01-22
Filing date: 2007-01-22
Publication date: 2008-01-02
Anticipated expiration: 2017-01-22

Abstract

The utility model provides a locking hipbone joint power screw, which comprises a ball stanchion steel plate (1) with a hollow columnar sleeve head (1-1), a power screw (2) inserted into the sleeve (1-1) hole from the front end, and a tail nail (3) inserted into the sleeve (1-1) hole from the rear end, the tail nail (3) is connected with the internal thread hole (2-2) at the tail of the power screw (2) through thread connection. The utility model is characterized in that mutually matched internal and external threads are manufactured on the external round surface of a tail (3-1) of the tail nail (3) and an inner round surface (1-2) at the back end of the ball stanchion steel plate sleeve (1-1) hole. The utility model can prevent the complication diseases that the main nail disengaging or cutting and piercing the caput femoris, bone neck shortening and displacement of bone fracture caused by the unlimited outward displacement on the near end of the fracture.

Description

The locking screw of power hip joint

Technical field

This utility model relates to a kind of medical apparatus and instruments, relates to a kind of locking screw of power hip joint that Hip Fracture comprises fracture of femoral neck and intertrochanteric fracture of the femur that is used for the treatment of specifically.

Background technology

Intertrochanteric fracture of the femur is one of the most common fracture of old people clinically, screw of power hip joint (dynamichipscrew, DHS) owing to allow fracture site dynamically to reach static dual pressurization, can firmly fix stable fracture, effectively reduce the generation of fracture related complication, thereby DHS becomes the goldstandard of treatment intertrochanteric fracture of the femur.Along with the increase of aged tendency of population and senile osteoporosis, the sickness rate of intertrochanteric fracture of the femur is obvious ascendant trend in recent years, and the sickness rate of 1972～1984 intertrochanteric fracture of the femur of reports such as Vilhjalmur accounts for 32% of all Hip Fractures; And 1992～1998 ratios have been increased to 68%.Although the method for clinical treatment intertrochanteric fracture of the femur is a lot of at present, traditional DHS internal fixation remains the preferred option and the goldstandard of treatment intertrochanteric fracture of the femur.

But the screw of power hip joint of prior art (seeing Fig. 1, Fig. 2) treatment intertrochanteric fracture of the femur still exists certain shortcoming.The slide design of DHS reaches fixing reliable by the dual pressurization function of firm static pressurization (tail is followed closely disposable pressurization in the art) and dynamic property pressurization (sliding between the postoperative nail-plate), helps union of fracture and early stage active purpose.But old intertrochanteric fracture of the femur often mostly is by the oblique fracture behind the forward direction for the unstable fracture broken ends of fractured bone, and how with large and small trochanteric fracture, the forfeiture of femur square is supported.Its dynamic property pressurizing performance can make near-end bone piece outwards move pressurization down after the fixing old femoral intertrochanteric unstable fracture of DHS, but the unconfined outer osteoporosis of moving old in addition hip sclerotin of near-end, easily make main nail (power screw) move back nail or cut and pass femoral head, head and neck cripetura and fracture redisplacement, and cause the internal fixation treatment failure.In addition, tradition DHS master nail (power screw) the place ahead pressurization screw thread is 20mm-25mm, be of convenient length for the treatment fracture of femoral neck, because of the long broken ends of fractured bone that then can not surpass plays pressurization, but for intertrochanteric fracture of the femur, the pressurization screw thread of same length then seems too short, and is few with the contact area of sclerotin, effectively a little less than the hold, be prone to equally that main nail moves back nail or cutting passes complication such as femoral head, fracture redisplacement.

Summary of the invention

The purpose of this utility model provide at existing weak point in the above-mentioned prior art just a kind of follow closely disposable pressurization (firm static pressurization) by tail in the art after, adopt the locking design apparatus to eliminate the locking screw of power hip joint of the dynamic pressurization function of DHS.

The purpose of this utility model can realize by following technique measures:

Locking screw of power hip joint of the present utility model comprises that head is the telescopic geese-head steel plates of hollow cylindrical, penetrate power screw the sleeve hole from front end, and the tail that penetrates the sleeve hole from the rear end is followed closely, described tail nail combines with the internal thread hole of power screw afterbody by the mode that is threaded, and it is characterized in that: be processed with the internal and external screw thread that cooperatively interacts on the periphery of described tail ailing tail He on the inner headed face of geese-head steel plates sleeve hole rear end.

The length of the pressurization thread segment of the power screw front end described in this utility model is 30mm～36mm.

Operation principle of the present utility model is as follows:

In the reduction of the fracture, drilling and tapping is screwed into DHS master's nail (power screw), and after the sleeve installation with DHS master's nail and geese-head steel plates, tighten with common (prior art) tail nail (tight fixed bolt) and the sleeve of geese-head steel plates earlier, make fracture site tightly involutory, the pressurization of realization firm static, and then back out tight fixed bolt, the tail of screwing on nail (lock(ing) bolt), to lead the sleeve locking of nail (power screw) and geese-head steel plates, thereby eliminate the dynamic pressurization function of DHS, the back fracture near-end that prevents to bear a heavy burden continues outer moving and causes main nail to move back nail or cutting spreads out of complication such as femoral head and fracture redisplacement.

This utility model dynamically reaches static dual pressurizing mechanism with the DHS of prior art and changes single pressurizing mechanism into, after being the fixing old femoral intertrochanteric unstable fracture of DHS, after following closely disposable pressurization (firm static pressurization) by tail in the art, adopt locking design apparatus (being the tail nail locks together by processing the female thread spinning on the external screw thread that processes on the nail tail periphery and the geese-head steel plates sleeve hole rear end inner headed face) the dynamic pressurization function of elimination DHS, the main nail that causes moves back nail or cutting passes complication such as femoral head, head and neck cripetura and fracture redisplacement thereby move outside the near-end that prevents to fracture is unconfined.In addition, this utility model also increases the length of DHS power screw front end pressurization screw thread, increases to 30mm～36mm by the 20mm～25mm of prior art.Effective like this hold that has increased the fracture near-end prevents that the DHS steel plate is loosening.

Description of drawings

Fig. 1 is the power screw of prior art and the structure chart of tail nail.

Fig. 2 is the geese-head steel plates structure chart of prior art.

Fig. 3 is the structure chart of power screw of the present utility model and tail nail.

Fig. 4 is a geese-head steel plates structure chart of the present utility model.

The specific embodiment

This utility model is further described below with reference to embodiment (accompanying drawing):

Shown in Fig. 3,4, locking screw of power hip joint of the present utility model comprises that head is the geese-head steel plates 1 of hollow cylindrical sleeve 1-1, penetrate power screw 2 the sleeve 1-1 hole from front end, and the tail that penetrates the sleeve 1-1 hole from the rear end follows closely 3, described tail nail 3 combines with the internal thread hole 2-2 of power screw 2 afterbodys by the mode that is threaded, and is processed with the internal and external screw thread that cooperatively interacts on the periphery of described tail nail 3 nail tail 3-1 with on the inner headed face 1-2 of geese-head steel plates sleeve hole rear end; The length of the pressurization thread segment 2-1 of described power screw 2 front ends is 33mm.

Product materials used of the present utility model is two kinds of medical stainless steel and titanium alloys, the hole count of DHS steel plate, and length, the diameter of angle and power screw is identical with the product of specifications such as length and prior art.

Claims

1, a kind of locking screw of power hip joint, it comprises that head is the geese-head steel plates (1) of hollow cylindrical sleeve (1-1), penetrate power screw (2) sleeve (1-1) hole from front end, and the tail that penetrates sleeve (1-1) hole from the rear end is followed closely (3), described tail nail (3) combines with the internal thread hole (2-2) of power screw (2) afterbody by the mode that is threaded, and it is characterized in that: be processed with the internal and external screw thread that cooperatively interacts on the periphery of described tail nail (3) nail tail (3-1) and on geese-head steel plates sleeve (1-1) rear end, the hole inner headed face (1-2).

2, locking screw of power hip joint according to claim 1 is characterized in that: the length of the pressurization thread segment (2-1) of power screw (2) front end is 30mm～36mm.