CN215688340U

CN215688340U - Injectable screw fixation system for femoral neck fractures

Info

Publication number: CN215688340U
Application number: CN202023200204.XU
Authority: CN
Inventors: 黄爱兵; 马小明; 周志勇; 魏嘉绪; 姜磊; 刘宇; 于情
Original assignee: Taizhou Peoples Hospital
Current assignee: Taizhou Peoples Hospital
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2022-02-01
Anticipated expiration: 2030-12-25

Abstract

The utility model relates to an injectable screw fixing system for femoral neck fracture, which comprises a screw, a hollow guide rod and a double-channel high-pressure injection device, wherein the screw comprises a screw body and a screw seat, a central through hole is formed in the screw body, external screw threads of the screw body are arranged on the outer wall of the front section or the whole section of the screw body, and a side hole communicated with the central through hole is formed in the side wall of the front section of the screw body; the nail seat is integrally connected with the tail end of the nail body, a polygonal hole is formed in the nail seat, and external threads of the nail seat are arranged on the periphery of the nail seat; the front end of the hollow guide rod is provided with a guide rod internal thread, and the rear end of the hollow guide rod is provided with a guide rod external thread; the double-channel high-pressure injection device comprises a three-way connector and two high-pressure injectors, the three-way connector is provided with two inlets and an outlet, the two inlets are respectively connected with the two high-pressure injectors, the three-way connector is provided with a control valve, and the outlet is used for being connected with the rear end of the hollow guide rod. The utility model can effectively inject the liquid for treatment into the fracture part, practically solves the technical obstacles in clinic and improves the curative effect of the operation.

Description

Injectable screw fixation system for femoral neck fractures

Technical Field

The utility model relates to an orthopedic instrument, in particular to an injectable screw fixing system for femoral neck fracture, and belongs to the technical field of medical instruments.

Background

The femoral neck fracture is a common clinical injury in orthopedics department, and the mechanical characteristics of the femoral neck and the anatomical particularity of femoral head blood supply cause the clinical complications of femoral head necrosis, fracture nonunion and the like after the femoral neck fracture operation. In surgical operation, doctors often select suitable internal implants according to fracture types and individual conditions of patients, and currently, a plurality of hollow screws, compression screws, dynamic hip screws, side steel plate composites and the like are commonly used as fixing methods.

However, regardless of the method used for treatment, the clinical doctors are always troubled by catastrophic complications such as fracture nonunion and avascular necrosis of the femoral head after the operation. Research reports that the incidence rate of avascular necrosis of the femoral head is as high as 10-43%, once the avascular necrosis of the femoral head occurs, hip joint pain and dysfunction are caused, secondary joint replacement operation is required to be performed if necessary, and heavy burden is brought to the psychology and the economy of a patient. Until now, there are many studies to reduce the occurrence of complications such as necrosis of femoral head by new means, but the actual effect is not good.

Research and analysis show that the root cause of femoral head necrosis after femoral neck fracture is femoral head loss of blood circulation, so the treatment is mainly to improve blood circulation. The study adopts periosteum with blood supply to reconstruct blood supply system of femoral head, can improve femoral head blood circulation, introduces periosteum with blood supply to femoral head necrosis area, and has dual functions of osteogenesis and blood vessel reconstruction. In recent years, two technologies of assisting autologous stem cell transplantation and assisting platelet-rich plasma are proved to have certain curative effect on reducing postoperative femoral head necrosis. The healing of fractures is mainly due to the fact that bone marrow stromal stem cells in bone marrow play a major role, but the content of bone marrow stromal stem cells in bone marrow is extremely low, and a large amount of bone marrow is needed to obtain a sufficient cell amount. The platelet-rich plasma is a platelet concentrated substance obtained after autologous whole blood is subjected to centrifugal operation, and after thrombin activation, the platelet-rich plasma can activate and release platelet-derived growth factors, transforming growth factor beta, vascular endothelial growth factors, insulin-like growth factors, epidermal growth factors and the like, and plays an important role in the repair of soft tissue and bone diseases. However, the difficulty in the clinical treatment process of the two technical methods is that the obtained stem cells or platelet-rich plasma cannot be effectively injected into the fracture part, so that the bone fracture part can directly and fully play a role in repair.

Disclosure of Invention

The utility model aims to overcome the clinical treatment problems in the prior art, and provides an injectable screw fixing system for femoral neck fracture, which has the advantages of ingenious structure and reasonable design, can effectively inject a liquid for treatment (stem cells or platelet-rich plasma) into the fracture part, practically solves the clinical technical obstacles, and improves the operation curative effect.

According to the technical scheme provided by the utility model: an injectable screw fixation system for femoral neck fractures characterized by: the screw comprises a screw body and a screw seat, wherein the screw body is used for being placed into a bone, a central through hole is formed in the screw body, external screw threads are formed on the outer wall of the front section or the whole section of the screw body, and side holes communicated with the central through hole are formed in the side wall of the front section of the screw body; the nail seat is integrally connected to the tail end of the nail body, a polygonal hole for connecting a screwdriver is formed in the nail seat, and nail seat external threads for connecting the hollow guide rod are formed in the periphery of the nail seat; the front end of the hollow guide rod is provided with a guide rod internal thread matched with the nail seat external thread, and the rear end of the hollow guide rod is provided with a guide rod external thread; the double-channel high-pressure injection device comprises a three-way connector and two high-pressure injectors, the three-way connector is provided with two inlets and an outlet, the two inlets are respectively connected with the two high-pressure injectors, the three-way connector is provided with a control valve for controlling the flow direction of liquid, and the outlet is used for being connected with the rear end of the hollow guide rod through threads.

As a further improvement of the utility model, the front end of the hollow guide rod is provided with a protruded extension inserted bar, and the outer diameter of the extension inserted bar is matched with the inner diameter of the central through hole.

As a further improvement of the utility model, the polygonal hole in the nail seat is a hexagon socket hole or a square hole.

As a further improvement of the utility model, the inlet of the three-way connector is provided with a butt-joint pipe for extending into the hose end of the high-pressure syringe and a lock nut for locking the hose end.

As a further improvement of the utility model, the outlet of the three-way connector is provided with a locking nut which can freely rotate but can not fall off from the outlet, and the inner peripheral wall of the locking nut is provided with a connecting internal thread matched with the guide rod external thread at the rear end of the hollow guide rod.

Compared with the prior art, the utility model has the following advantages:

1) the utility model has the advantages of ingenious structure and reasonable design, can inject the liquid for treatment from the side hole at the front section of the screw through the connection and the matching of the screw, the hollow guide rod and the double-channel high-pressure injection device, can uniformly diffuse the liquid for treatment to the periphery after the liquid for treatment is injected, can sequentially and accurately control the amount of the injected liquid, and is particularly suitable for the operation treatment of femoral neck fracture.

2) The screw, the hollow guide rod and the three-way connector are all connected through threads, so that leakage can be avoided when liquid can be injected at high pressure, and the reliability is good.

3) The front end of the hollow guide rod is provided with the protruding extension inserted rod, the outer diameter of the extension inserted rod is matched with the inner diameter of the central through hole, when the rear end of the screw is in butt joint with the front end of the hollow guide rod, the extension inserted rod is firstly inserted into the central through hole, the hollow guide rod and the screw are conveniently and accurately in butt joint, the connection sealing performance of the hollow guide rod and the screw is improved, and the phenomenon that liquid is leaked when injected at high pressure is further ensured.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention.

Fig. 2 is an enlarged schematic view of a screw structure according to an embodiment of the present invention.

Fig. 3 is an enlarged schematic view of the structure of the hollow guide rod in the embodiment of the utility model.

Fig. 4 is an enlarged schematic view of the structure of the three-way connector in the embodiment of the utility model.

Description of reference numerals: the automatic screw nail comprises a 1-screw, a 1 a-nail body, a 1 b-nail seat, a 1 c-central through hole, a 1 d-nail body external thread, a 1 e-side hole, a 1 f-polygonal hole, a 1 g-nail seat external thread, a 2-hollow guide rod, a 2 a-guide rod internal thread, a 2 b-guide rod external thread, a 2 c-extension inserted rod, a 3-three-way connector, a 3 a-inlet, a 3 b-outlet, a 3 c-control valve, a 3 d-butt joint pipe, a 3 e-locking nut, a 3 f-locking nut and a 4-high-pressure injector.

Detailed Description

The utility model is further illustrated by the following specific figures and examples.

As shown in fig. 1, the embodiment discloses an injectable screw fixing system for femoral neck fracture, which comprises a screw 1, a hollow guide rod 2 and a dual-channel high-pressure injection device, wherein the screw 1 comprises a screw body 1a and a screw seat 1b, the screw body 1a is used for being placed into a bone, a central through hole 1c is formed in the screw body 1a, the outer wall of the whole section of the screw body 1a is provided with a screw body external thread 1d, and the side wall of the front section of the screw body 1a is provided with a side hole 1e communicated with the central through hole 1 c; the nail seat 1b is integrally connected to the tail end of the nail body 1a, a polygonal hole 1f for connecting a screwdriver is formed in the nail seat 1b, and a nail seat external thread 1g for connecting the hollow guide rod 2 is formed in the periphery of the nail seat 1 b; the front end of the hollow guide rod 2 is provided with a guide rod internal thread 2a matched with the nail seat external thread 1g, and the rear end of the hollow guide rod 2 is provided with a guide rod external thread 2 b; binary channels high pressure injection device includes three way connection ware 3 and two high pressure syringe 4, three way connection ware 3 has two import 3a and an export 3b, two high pressure syringe 4 is connected respectively to import 3a, be equipped with the control flap 3c of control liquid flow direction on the three way connection ware 3, export 3b be used for with 2 rear end threaded connection of cavity guide arm.

When in surgical operation, firstly, a screwdriver is used for screwing the screw 1 into the fixed fracture part; then the front end of the hollow guide rod 2 is tightly connected to the nail seat 1b of the screw 1 through the matching of the nail seat external thread 1g and the guide rod internal thread 2a, and the rear end of the guide rod is tightly connected to the outlet 3b end of the three-way connector 3 through the guide rod external thread 2 b; two inlets 3a of the three-way connector 3 are respectively connected with two high-pressure syringes 4, wherein one high-pressure syringe 4 contains liquid for treatment (stem cells or platelet-rich plasma), and the other high-pressure syringe 4 contains liquid bone wax or polymethyl methacrylate. When in use, one high-pressure injector 4 pumps the liquid for treatment, and then the other high-pressure injector 4 pumps the liquid bone wax or the polymethyl methacrylate; after the therapeutic liquid enters the screw 1 with the hollow interior, the therapeutic liquid can be uniformly diffused to the periphery through the side hole 1e, the amount of the injected liquid can be sequentially and accurately controlled, the screw is particularly suitable for the operation treatment of femoral neck fracture, and the clinical application performance is excellent; after the liquid bone wax or the polymethyl methacrylate enters the central through hole 1c of the screw 1, the liquid state is changed into the solid state in a short time, which plays a role in blocking the screw hole and prevents the liquid for treatment from flowing out. And a control valve 3c on the three-way connector 3 is used for controlling the liquid flow direction during treatment. Because the screw 1, the hollow guide rod 2 and the three-way connector 3 are connected through threads, leakage can be prevented when liquid can be injected at high pressure, and the reliability is good.

As shown in fig. 1 and 3, in this embodiment, a protruding extension insertion rod 2c is disposed at the front end of the hollow guide rod 2, and the outer diameter of the extension insertion rod 2c matches the inner diameter of the central through hole 1 c. So set up, when 1 rear end of screw and 2 front ends of hollow guide rod docks, extension inserted bar 2c inserts central through-hole 1c earlier, and the accurate butt joint of hollow guide rod 2 and screw 1 of being convenient for still is favorable to improving the leakproofness that the two is connected in addition, does not take place the seepage when further ensuring high pressure injection liquid.

As shown in fig. 1 and 2, in the present embodiment, the polygonal hole 1f in the nail seat 1b is a hexagon socket, which is convenient for connecting with a screwdriver during a surgical operation and for screwing the screw 1 to fix a fracture part during the surgical operation. Of course, the polygonal hole 1f may be a square hole or the like as long as it can be matched with the front end of the driver. In addition, the nail body 1a in this embodiment is a full thread structure (the outer wall of the full section is provided with the nail body external thread 1d), and in actual use, the nail body 1a may also be a half thread structure (only the outer wall of the front section is provided with the nail body external thread 1 d).

In the present embodiment, as shown in fig. 1 and 4, the inlet 3a of the three-way connector 3 is provided with a butt pipe 3d for inserting the end of the hose 5 of the high-pressure syringe 4 and a lock nut 3e for locking the end of the hose 5. So set up, when using earlier with the hose 5 end cover of high-pressure syringe 4 cup joint on butt joint pipe 3d and inwards promote to in lock nut 3e, then screw up lock nut 3e, just so can make the hose 5 of high-pressure syringe 4 and three way connection ware 3 safe and reliable seal butt joint.

As shown in fig. 1 and 4, in the present embodiment, a lock nut 3f that is rotatable but not detachable from the outlet 3b is provided at the outlet 3b of the three-way connector 3, and a connection female screw that matches with the guide bar male screw 2b at the rear end of the hollow guide bar 2 is provided on the inner peripheral wall of the lock nut 3 f. Due to the arrangement, the locking nut 3f can freely rotate, so that the locking nut 3f can be hermetically butted with the rear end of the hollow guide rod 2 only by screwing, the three-way connector 3 does not need to be turned over, and the operation is very convenient.

In addition, the high pressure syringe 4 of the present invention may be any conventional product in the prior art as long as it has the capability of delivering liquid at a high pressure, and will not be described in detail herein.

The above description is only for the preferred embodiment of the present invention, and the above specific embodiments are not intended to limit the present invention. Various modifications and alterations may occur to those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and alterations should be accorded the broadest interpretation so as to encompass all such modifications and alterations.

Claims

1. An injectable screw fixation system for femoral neck fractures characterized by: the bone screw comprises a screw (1), a hollow guide rod (2) and a double-channel high-pressure injection device, wherein the screw (1) comprises a screw body (1a) and a screw seat (1b), the screw body (1a) is used for being placed into a bone, a central through hole (1c) is formed in the screw body (1a), screw body external threads (1d) are arranged on the outer wall of the front section or the whole section of the screw body (1a), and a side hole (1e) communicated with the central through hole (1c) is formed in the side wall of the front section of the screw body (1 a); the nail seat (1b) is integrally connected to the tail end of the nail body (1a), a polygonal hole (1f) for connecting a screwdriver is formed in the nail seat (1b), and a nail seat external thread (1g) for connecting the hollow guide rod (2) is formed in the periphery of the nail seat (1 b); the front end of the hollow guide rod (2) is provided with a guide rod internal thread (2a) matched with the nail seat external thread (1g), and the rear end of the hollow guide rod (2) is provided with a guide rod external thread (2 b); binary channels high pressure injection device includes three way connection ware (3) and two high pressure syringe (4), three way connection ware (3) have two import (3a) and an export (3b), two high pressure syringe (4) are connected respectively in import (3a), be equipped with control valve (3c) that control liquid flows to on three way connection ware (3), export (3b) be used for with cavity guide arm (2) rear end threaded connection.

2. An injectable screw fixation system for femoral neck fractures as claimed in claim 1, wherein: the front end of the hollow guide rod (2) is provided with a protruding extension inserted bar (2c), and the outer diameter of the extension inserted bar (2c) is matched with the inner diameter of the central through hole (1 c).

3. An injectable screw fixation system for femoral neck fractures as claimed in claim 1, wherein: the polygonal hole (1f) in the nail seat (1b) is an inner hexagonal hole or a square hole.

4. An injectable screw fixation system for femoral neck fractures as claimed in claim 1, wherein: an inlet (3a) of the three-way connector (3) is provided with a butt joint pipe (3d) used for extending into the tail end of a hose (5) of the high-pressure injector (4) and a locking nut (3e) used for locking the tail end of the hose (5).

5. An injectable screw fixation system for femoral neck fractures as claimed in claim 1, wherein: the three-way connector is characterized in that a locking nut (3f) which can freely rotate but cannot fall off from an outlet (3b) is arranged at the outlet (3b) of the three-way connector (3), and a connecting internal thread matched with a guide rod external thread (2b) at the rear end of the hollow guide rod (2) is arranged on the inner peripheral wall of the locking nut (3 f).