CN213156367U

CN213156367U - Percutaneous minimally invasive internal fixation hollow long-tail screw for proximal femoral fracture

Info

Publication number: CN213156367U
Application number: CN202021065238.XU
Authority: CN
Inventors: 高明暄; 李红; 汪能; 李兴勇; 骆文远
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2021-05-11
Anticipated expiration: 2030-06-11

Abstract

The utility model provides a proximal femoral fracture percutaneous minimally invasive internal fixation hollow long-tail screw, which is characterized by comprising a U-shaped long tail and a threaded nail. The screw nail is of a hollow structure, the front part of the screw nail is provided with continuous threads, the rear end of the screw nail is provided with an expanded part, the tip and the root of the continuous threads are both cortical bone threads, the middle part of the screw nail is provided with cancellous bone threads, the expanded part is of a flat columnar structure and is arranged in an oval hole at the front end of the U-shaped long tail, and the U-shaped long tail and the screw nail form a joint structure which can swing in a one-way small range at the connecting part. The utility model provides a long tail screw is applied to from preceding backward, the fixed thighbone near-end fracture of percutaneous wicresoft, and the screw thread nail passes the very high preceding of thighbone neck sclerotin quality, two cortices in back and middle cancellous bone, and internal fixation intensity is high, and the long tail is convenient for percutaneous implantation, and through the fixed back of tail cap and connecting rod, the long tail can break in the outside to accomplish the internal fixation treatment of percutaneous wicresoft's fracture.

Description

Percutaneous minimally invasive internal fixation hollow long-tail screw for proximal femoral fracture

Technical Field

The utility model relates to the technical field of medical equipment, specific theory relates to a hollow long tail screw of thighbone near-end fracture percutaneous minimally invasive internal fixation.

Background

The proximal end of the femur is adjacent to the hip joint, the external soft tissue is relatively shallow and thin, the structure is simple, the positions of the front and the back of the proximal end of the femur are relatively deep, and meanwhile, the soft tissue is complicated in anatomy and has significant structures such as blood vessels and nerves. Therefore, the fracture between the trochanters of the femur currently adopts a lateral approach to carry out internal fracture fixation regardless of an extramedullary nail plate system or an intramedullary head intramedullary nail system. Under the limitation, the internal fixation screw or the spiral blade at the fracture proximal end is from outside to inside, and the bone with the best quality for fixing the fracture proximal end is subchondral bone. Thus, fixation strength is limited not only by the subchondral bone "mass", but also by the "mass".

SUMMERY OF THE UTILITY MODEL

The utility model provides a hollow long tail screw of thighbone near-end fracture percutaneous minimal access internal fixation through the design to the screw thread, makes it can adapt to the needs that the thighbone near-end used.

The utility model provides a hollow long tail screw of thighbone near-end fracture percutaneous wicresoft internal fixation, including "U" shape long tail and screw nail two parts, the screw nail is hollow structure, it is preceding to be continuous screw thread, the rear end is the portion of expanding, the most advanced of continuous screw thread and root are the cortex bone screw thread, the intermediate part is spongy bone screw thread, the external diameter of the screw thread of intermediate part and root wherein equals, the portion of expanding of rear end of screw nail is put in the oval hole of the front end of "U" shape long tail, and correspondingly, the portion of expanding of screw nail is flat column structure, the minor axis looks adaptation in oval hole is managed to the minor axis of column structure, the major axis in column structure is less than the major axis in oval hole, make "U" shape long tail and screw nail form one-way little wobbling joint structure in connecting portion.

The inner wall of the U-shaped long tail is provided with threads for being connected with the tail cap, the outer part of the tail cap is provided with threads matched with the inner wall of the U-shaped long tail, and the outer side of the bottom of the U-shaped opening of the U-shaped long tail is provided with circumferential nicks for facilitating the breakage of the U-shaped long tail.

The diameter of the long tail of the U shape is more than twice of the diameter of the threaded connection part.

The thread pitch of the cancellous bone thread is more than twice the thread pitch of the cortical bone thread.

The distance between the nick and the bottom of the U-shaped opening of the U-shaped long tail is larger than the length of the tail cap.

Has the advantages that:

the fracture nearly fracture broken end neck bone piece is mainly from outside-in through the fixed subchondral bone of intramedullary fixation between the fixed rotor of current internal fixation system, and the utility model provides a long tail screw can be from forward backward, fixed neck bone piece thighbone neck bone quality is very high preceding, back double skin, and internal fixation intensity can improve a lot undoubtedly, and the long tail is convenient for percutaneous implantation, through the fixed back of tail cap and connecting rod, the long tail can break in the outside to accomplish percutaneous wicresoft's fracture internal fixation.

The utility model discloses use fracture neck bone piece sclerotin characteristics between the rotor as the basis, the design of screw thread adopts the characteristics that cortex bone and cancellous bone screw thread combine to this maximize that improves screw and sclerotin cohesion.

The utility model discloses on the basis of the complicated soft tissue anatomical structure research of hip joint front side, adopt hollow, long tail design to performance orthopedics robot assisted surgery's advantage, on CT data basis in the art, put into the position that sclerotin quality is good relatively with the guide pin, then put into the screw under the guide pin guide, performance effective fixation.

Drawings

The invention may be better understood from the following description of particular embodiments thereof taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic diagram of the basic structure of the present invention.

Fig. 2 is a transverse sectional view in fig. 1.

Fig. 3 is a longitudinal sectional view in fig. 1.

Fig. 4 is a schematic view of the usage state of the present invention.

Other features, objects and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like or similar reference characters identify the same or similar features.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but covers any modification, replacement or improvement of elements, components and algorithms without departing from the spirit of the present invention. In the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.

Example embodiments will now be described with reference to the accompanying drawings, which may be embodied in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.

As shown in fig. 1-4, the embodiment of the present invention provides a hollow screw for percutaneous minimally invasive internal fixation of proximal femoral fracture, comprising a "U" shaped long tail 6 and a screw nail, wherein the screw nail is of a hollow structure, the front part of the screw nail is a continuous thread, the rear end of the screw nail is an enlarged part 8, the tip 1 and the root 3 of the continuous thread are both cortical bone threads, the middle part 2 is a spongy bone thread, the outer diameter of the threads of the middle part 2 and the root 3 are equal, the enlarged part of the rear end of the screw nail is disposed in an elliptical hole at the front end of the "U" shaped long tail 6, the elliptical hole is used for fixedly connecting with the rear end of the screw nail, the enlarged part can be accommodated, the "U" shaped long tail 6 and the screw nail are fixed to each other, correspondingly, the enlarged part 8 of the screw nail is a flat columnar structure, the short diameter of the columnar structure is adapted to the short axis of the elliptical hole, the long diameter of the columnar structure is smaller than the long axis of the, the U-shaped long tail and the threaded nail form a joint structure which can swing in a unidirectional small amplitude at the connecting part.

It should be noted that the columnar structure is also a hollow structure, the expansion part is located at the end of the screw, and the expansion part is provided with a structure (an inner hexagonal structure, a cross taper hole, etc.) capable of being connected with an external control structure (such as a cross screwdriver and a hexagonal wrench) so as to control the screwing of the screw by means of external force.

The inner wall of the U-shaped long tail 6 is provided with a thread 7, the thread 7 is arranged from the nick 5 to the bottom of the U-shaped long tail 6 and is used for being connected with the tail cap 4, the outer part of the tail cap 4 is provided with a thread matched with the inner wall of the U-shaped long tail, and the outer side of the bottom of the U-shaped opening of the U-shaped long tail is provided with a circumferential nick 5 so as to be convenient for the U-shaped long tail to break. The tail cap 4 is also provided with a structure for an external control structure to control the screwing-in so as to control the tail cap 4 to feed in the U-shaped long tail 6.

The tail of the enlarged part 8 is shaped to fit the shape of the U-shaped base of the long tail 6 of the "U".

The U-shaped long tail 6 is a part processed by a round tube, the inside of the U-shaped long tail is a round hole, and an oval hole is processed at the top end of the U-shaped long tail.

The fracture nearly fracture broken end neck bone piece is mainly from outside-in neck marrow internal fixation subchondral bone between the fixed rotor of current internal fixation system, and the utility model discloses the screw can be from preceding backward, and preceding, back double skin matter that fixed neck bone piece thighbone neck sclerotin quality is very high, and internal fixation intensity can improve a lot undoubtedly.

The utility model discloses the important tissue part of fixing system in the nail stick of fracture between screw belongs to femoral trochanter, is different from nail board, the head marrow nail internal fixation system again totally in the overall structure, adopts nail, stick integrated design, and the substep is put into, combines traction table and robot to assist, and the fracture internal fixation is accomplished to percutaneous wicresoft, and soft tissue damage is little.

The utility model discloses the nail stick internal fixation system that the screw is constituteed, fracture from the fixed rotor of front side, on the human stress line in internal fixation place, the compressive stress arm of force is very little or is close to zero, consequently, to bearing the higher thighbone near-end of compressive stress requirement under the physiological condition, the fixed back of fracture, the advantage of internal fixation compressive stress will be very obvious.

The utility model discloses nail stick internal fixation system that the screw is constituteed to traditional method nail board or intramedullary nail fixation failure case, will follow new approach, new direction and new method and fix again, consequently will have the revision advantage that is different from above-mentioned internal fixation to failure case.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to this embodiment will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

It will be appreciated by persons skilled in the art that the above embodiments are illustrative and not restrictive. Different features which are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the specification and the claims. In the claims, the term "comprising" does not exclude other means or steps; the indefinite article "a" does not exclude a plurality; the terms "first" and "second" are used to denote a name and not to denote any particular order.

Claims

1. The utility model provides a hollow long tail screw of thighbone near-end fracture percutaneous wicresoft internal fixation which characterized in that, includes "U" shape long tail and screw nail two parts, the screw nail is hollow structure, it is preceding to be continuous screw thread, the rear end is the portion of expanding, the pointed end and the root of continuous screw thread are cortical bone screw thread, the middle part is spongy bone screw thread, the external diameter of the screw thread of middle part and root wherein equals, the portion of expanding of the rear end of screw nail is put in the oval hole of the front end of "U" shape long tail, and correspondingly, the portion of expanding of screw nail is flat column structure, the minor axis in oval hole is adapted to the minor axis of column structure, the major axis in column structure is less than the major axis in oval hole, make "U" shape long tail and screw nail form one-way little swing joint structure in connecting portion.

2. The proximal femoral fracture percutaneous minimally invasive internal fixation hollow long tail screw as claimed in claim 1, wherein the inner wall of the U-shaped long tail is provided with threads for connecting with a tail cap, the outer part of the tail cap is provided with threads matched with the inner wall of the U-shaped long tail, and the outer side of the bottom of the U-shaped opening of the U-shaped long tail is provided with a circumferential notch for facilitating the fracture of the U-shaped long tail.

3. The proximal femoral fracture percutaneous minimally invasive internal fixation hollow long-tail screw according to claim 1, wherein the diameter of the U-shaped long tail is more than twice of the diameter of the threaded connection part.

4. The proximal femoral fracture percutaneous minimally invasive internal fixation hollow long-tail screw according to claim 1, wherein the thread pitch of the cancellous bone thread is more than twice as long as the thread pitch of the cortical bone thread.

5. The proximal femoral fracture percutaneous minimally invasive internal fixation hollow long-tail screw as claimed in claim 2, wherein the distance between the nick and the bottom of the U-shaped opening of the U-shaped long tail is larger than the length of the tail cap.