CN215458517U

CN215458517U - Bone stretching instrument for treating early and medium femoral head necrosis

Info

Publication number: CN215458517U
Application number: CN202120747777.XU
Authority: CN
Inventors: 于晓巍; 单浩杰; 姜朝来; 魏保山; 张长青
Original assignee: Shanghai Sixth Peoples Hospital
Current assignee: Shanghai Sixth Peoples Hospital
Priority date: 2021-04-13
Filing date: 2021-04-13
Publication date: 2022-01-11
Anticipated expiration: 2031-04-13

Abstract

The utility model discloses a bone stretching instrument for early and medium femoral head necrosis treatment, which comprises a front section screw, wherein the front section screw is connected with a femoral body, the bottom of the femoral body is provided with an outer fixed support through a fixing screw, one end of the fixing screw, which is far away from the femoral body, penetrates through the outer fixed support and is in threaded connection with a nut, one end of the front section screw is fixedly connected with a carrying screw rod assembly, the carrying screw rod assembly comprises a threaded screw rod assembly and a rack screw rod assembly, the threaded screw rod assembly comprises a threaded screw rod, and one end of the front section screw is fixedly connected with a threaded screw rod, so that the bone stretching instrument has the advantages that: the bone column can be slowly and continuously drawn along the femoral neck direction, the drawing tension can promote the proliferation and the biosynthesis function of cells, the metabolism and the tissue growth become active, the osteogenesis capability is enhanced, the local microcirculation is also increased, and the repair of the femoral head necrosis is finally promoted.

Description

Bone stretching instrument for treating early and medium femoral head necrosis

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a bone stretching instrument for early and medium femoral head necrosis treatment.

Background

Treatment of femoral head necrosis remains a challenge for orthopedic surgeons. The treatment method of femoral head necrosis mainly comprises core decompression, porous tantalum rod implantation, vascular pedicle bone grafting, hip joint replacement, osteotomy and the like. For patients with early and middle stage femoral head necrosis, protecting head by core decompression, porous tantalum rod implantation, bone grafting and osteotomy; however, for patients with advanced femoral head necrosis, even if satisfactory local physiological and mechanical environments are recovered, the disease development cannot be reversed, and hip joint replacement is mostly needed. Among them, the hip protection technique based on the core decompression has become the most common means for treating the early and middle stage femoral head necrosis.

The medullary core decompression can reduce intraosseous pressure and improve blood circulation in femoral head. The core decompression combined with the porous tantalum rod implantation or bone grafting can provide mechanical support for subchondral bone and delay or prevent collapse of femoral head. However, the difficulty of revascularization and re-ossification of the femoral head necrosis area is still high, and the failure of the hip protection technology based on the core decompression operation in clinical treatment of the femoral head necrosis still occurs occasionally, which brings great physical and psychological pain and economic burden to patients.

An effective solution to the problems in the related art has not been proposed yet.

SUMMERY OF THE UTILITY MODEL

The technical task of the utility model is to provide a bone distraction apparatus for treating early and medium femoral head necrosis aiming at the defects, so as to solve the problems in the background art.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a bone tractive stretching apparatus for early and middle stage femoral head necrosis treatment, includes the anterior segment screw, anterior segment screw and this body coupling of thighbone, the outer fixed bolster is installed through set screw to the bottom of thighbone body, set screw keeps away from the one end of thighbone body runs through outer fixed bolster, and threaded connection has the nut, the one end fixedly connected with transport screw rod subassembly of anterior segment screw, transport screw rod subassembly includes screw thread formula screw rod subassembly and rack formula screw rod subassembly, screw thread formula screw rod subassembly includes screw thread formula screw rod, the one end fixedly connected with screw thread formula screw rod of anterior segment screw, screw thread formula screw rod with outer fixed bolster threaded connection, outer fixed bolster's surface mounting has lag screw.

Further, rack formula screw assembly includes rack formula screw rod and gear, the surperficial symmetric connection of outer fixed bolster has the gear, one side meshing of gear has rack formula screw rod, rack formula screw rod with anterior segment screw fixed connection.

Furthermore, a limiting device is fixedly connected between the front section screw and the carrying screw rod assembly.

Further, the surface of the limiting device is symmetrically provided with the Kirschner wire.

Further, the rack screw is cylindrical.

Furthermore, the threaded screw and one end of the rack screw are fixedly connected with a handle.

The utility model has the beneficial effects that:

1. the bone distraction apparatus for treating the early and middle femoral head necrosis can combine the marrow core decompression technology with the bone carrying technology, can slowly and continuously distract a bone column along the femoral neck direction, and the distraction tension can promote the proliferation and the biosynthesis function of cells, so that the metabolism and the tissue growth become active, the osteogenesis capacity is enhanced, the local microcirculation is also increased, the repair of the femoral head necrosis is finally promoted, the success rate of the operation is expected to be improved, and the prognosis of a patient is improved.

2. Through setting up limiting device, can be with carrying screw rod subassembly restriction outside the bone post, prevent that carrying screw rod subassembly from continuing to go deep.

3. Through setting up the kirschner wire to prevent when rotatory transport screw rod subassembly, screw out the bone post with anterior segment screw.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural view of a bone distraction device for early and medium femoral head necrosis treatment according to an embodiment of the utility model;

fig. 2 is a schematic structural diagram of a rack screw assembly in a bone distraction device for early and medium femoral head necrosis treatment according to an embodiment of the utility model.

Reference numerals:

1. a front section screw; 2. a restriction device; 3. a Kirschner wire; 4. a threaded screw; 5. a lag screw; 6. a handle; 7. an outer fixed bracket; 8. a nut; 9. a set screw; 10. a femoral bone body; 11. a rack-type screw; 12. a gear.

Detailed Description

The utility model is further described with reference to the following figures and specific examples.

The first embodiment is as follows:

referring to fig. 1-2, a bone distraction device for early and middle femoral head necrosis treatment according to an embodiment of the present invention includes a front-section screw 1, the front-section screw 1 is connected to a femur body 10, an external fixing bracket 7 is mounted at the bottom of the femur body 10 through a fixing screw 9, one end of the fixing screw 9, which is far away from the femur body 10, penetrates the external fixing bracket 7 and is in threaded connection with a nut 8, one end of the front-section screw 1 is fixedly connected with a carrying screw assembly, the carrying screw assembly includes a threaded screw assembly and a rack screw assembly, the threaded screw assembly includes a threaded screw 4, the threaded screw 4 is opposite to the thread of the front-section screw 1, one end of the front-section screw 1 is fixedly connected with a threaded screw 4, and the threaded screw 4 is in threaded connection with the external fixing bracket 7, the surface of the outer fixing bracket 7 is provided with a tension screw 5.

Through the scheme of the utility model, the bone column can be slowly and continuously stretched along the femoral neck direction, the stretching tension can promote the proliferation and the biosynthesis function of cells, the metabolism and the tissue growth become active, the osteogenesis capacity is enhanced, the local microcirculation is also increased, and the repair of femoral head necrosis is finally promoted.

Example two:

referring to fig. 1-2, for the rack-type screw assembly, the rack-type screw assembly includes a rack-type screw 11 and a gear 12, the gear 12 is symmetrically connected to the surface of the outer fixing bracket 7, the rack-type screw 11 is engaged with one side of the gear 12, the rack-type screw 11 is fixedly connected to the front-section screw 1, for the front-section screw 1, a limiting device 2 is fixedly connected between the front-section screw 1 and the carrying screw assembly, for the limiting device 2, kirschner pins 3 are symmetrically installed on the surface of the limiting device 2, for the rack-type screw 11, the rack-type screw 11 is cylindrical, and for the threaded screw 4, a handle 6 is fixedly connected to one end of each of the threaded screw 4 and the rack-type screw 11.

Through the scheme of the utility model, the limiting device 2 is arranged, the carrying screw rod component can be limited outside the bone column, the carrying screw rod component is prevented from going deep, and the kirschner wire 3 is arranged, so that the front section screw 1 is prevented from being screwed out of the bone column when the carrying screw rod component is rotated.

For the convenience of understanding the technical solutions of the present invention, the following detailed description will be made on the working principle or the operation mode of the present invention in the practical process.

In practical application, the front-section screw 1 is completely screwed into the femur body 10, two kirschner wires 3 are drilled at the edge of the limiting device 2, the external fixing support 7 is installed with the threaded screw 4 or the rack screw 11, two fixing screws 9 are screwed into the outer side of the femur body 10 and are connected and fixed with the external fixing support 7 by using the screw cap 8, standing is carried out for 4-7 days after an operation, the threaded screw 4 is screwed clockwise if the threaded screw 4 is installed, the gear 12 is rotated anticlockwise by using a wrench if the rack screw 11 is installed, a bone column is retreated by 1mm along the femoral neck direction every day, X-ray pieces are taken regularly to determine the position of the bone column until the outer side of the bone column moves to the outer side cortical plane of the tuberosity, the external fixing support 7 is detached, and the front-section screw 1 is taken out.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The bone distraction apparatus for treating the early and middle femoral head necrosis is characterized by comprising a front section screw (1), wherein the front section screw (1) is connected with a femoral body (10), an outer fixing support (7) is arranged at the bottom of the femoral body (10) through a fixing screw (9), one end, far away from the femoral body (10), of the fixing screw (9 penetrates through the outer fixing support (7) and is in threaded connection with a nut (8), one end of the front section screw (1) is fixedly connected with a carrying screw rod component, the carrying screw rod component comprises a threaded screw rod component and a rack screw rod component, the threaded screw rod component comprises a threaded screw rod (4), one end of the front section screw (1) is fixedly connected with a threaded screw rod (4), and the threaded screw rod (4) is in threaded connection with the outer fixing support (7), and a tension screw (5) is arranged on the surface of the outer fixing support (7).

2. The bone distraction apparatus for early and medium femoral head necrosis treatment according to claim 1, wherein the rack-type screw assembly comprises a rack-type screw (11) and a gear (12), the gear (12) is symmetrically connected to the surface of the outer fixing bracket (7), the rack-type screw (11) is engaged with one side of the gear (12), and the rack-type screw (11) is fixedly connected with the front section screw (1).

3. The bone distraction device for the treatment of early and medium femoral head necrosis according to claim 1, wherein the anterior screw (1) is fixedly connected with the carrying screw assembly by a limiting device (2).

4. A bone distraction device for the treatment of early and medium femoral head necrosis according to claim 3, wherein the surface of the restriction device (2) is symmetrically provided with kirschner wires (3).

5. The bone distraction instrument for the treatment of early and medium femoral head necrosis according to claim 2, wherein the rack screw (11) is cylindrical.

6. The bone distraction instrument for the treatment of early and medium femoral head necrosis according to claim 1, wherein a handle (6) is fixedly connected to one end of each of the threaded screw (4) and the rack screw (11).