CN216317908U

CN216317908U - Magnesium alloy compression screw

Info

Publication number: CN216317908U
Application number: CN202122288770.9U
Authority: CN
Inventors: 付六男; 潘兵辉
Original assignee: Chuangmeide Medical Devices Tianjin Co ltd
Current assignee: Chuangmeide Medical Devices Tianjin Co ltd
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2022-04-19
Anticipated expiration: 2031-09-22

Abstract

The utility model provides a magnesium alloy compression screw, which belongs to the technical field of orthopedic medical instruments and comprises a screw rod, a screw tail and a core hole, wherein the screw rod and the screw tail are sequentially connected, the core hole penetrates through the screw rod from the screw tail, a rod part thread is arranged on the outer wall of one end, away from the screw tail, of the screw rod, a self-tapping groove is arranged at one end, away from the screw tail, of the rod part thread, a tail part thread is arranged on the outer wall of the screw tail, a plurality of pressure relief grooves are arranged on the tail part thread, and meanwhile, an operation hole is formed in the end face, away from the screw rod, of the screw tail in a concave mode; the thread pitch of the rod part thread and the thread pitch of the tail part thread are different; the screw rod and the screw tail are made of medical degradable materials. The compression screw can attach the bone more tightly during operation, thereby well achieving the effect of compression; after one year after the operation of the patient, the screw is taken out without a secondary operation, and the screw can be slowly degraded along with the lapse of time, so that the secondary operation is avoided, and the pain of the patient is relieved.

Description

Magnesium alloy compression screw

Technical Field

The utility model belongs to the technical field of orthopedic medical instruments, and particularly relates to a magnesium alloy compression screw.

Background

Fracture is one of the most common injuries, the annual incidence rate of fracture gradually increases with the aging and serious population, surgery is a more effective treatment scheme, and as new operation theories are continuously proposed, people realize that the intraoperative and postoperative recovery of fracture are also important.

The hollow compression screw in the prior art can only meet the requirement of repairing the fracture of a patient in an operation and cannot achieve the final purpose of reducing the pain of the patient, and the patient needs to perform the operation again to take out the nail in the body after recovering for a period of time, so that the patient can suffer from secondary pain.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a magnesium alloy compression screw, which not only can effectively achieve a compression effect to make the bone of a patient fit more tightly, but also can avoid a secondary operation performed by the patient, thereby effectively alleviating pain of the patient.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows: the magnesium alloy compression screw comprises a screw rod, a screw tail and a core hole, wherein the screw rod and the screw tail are sequentially connected, the core hole penetrates through the screw rod from the screw tail, a rod part thread is arranged on the outer wall of one end, away from the screw tail, of the screw rod, a self-tapping groove is formed in one end, away from the screw tail, of the rod part thread, a tail part thread is arranged on the outer wall of the screw tail, a plurality of pressure relief grooves are formed in the tail part thread, and meanwhile, an operation hole is formed in the end face, away from the screw rod, of the screw tail in an inwards recessed mode; the thread pitch of the rod part thread and the thread pitch of the tail part thread are different; the screw rod and the screw tail are made of medical degradable materials.

Furthermore, an inner thread is arranged on the inner wall of the core hole.

Furthermore, the screw rod and the screw tail are made of magnesium alloy materials.

Further, the thread pitch of the rod part thread is larger than that of the tail part thread, and the thread pitch ratio of the rod part thread to the tail part thread is 1.1-1.5.

Furthermore, the operation hole is an inner hexagonal hole or an inner hexagonal plum blossom-shaped hole.

Furthermore, an inner rod is connected to the inside of the core hole in a threaded manner, one end of the inner rod extends to the self-tapping groove, the other end of the inner rod is arranged at a position close to the operation hole, and an installation hole is formed in one end of the inner rod close to the screw tail; the inner rod is made of magnesium alloy.

Further, a plurality of pressure relief grooves are axially and uniformly distributed on the surface of the tail thread.

Compared with the prior art, the magnesium alloy compression screw has the following advantages: the magnesium alloy compression screw can attach bones more tightly during operation, and has a good compression effect; after one year after the operation of the patient, the screw is taken out without a secondary operation, and the screw can be slowly degraded along with the lapse of time, so that the secondary operation is avoided, and the pain of the patient is relieved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic structural diagram of a magnesium alloy compression screw (installation inner rod) according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a magnesium alloy compression screw (without an inner rod installed) according to an embodiment of the present invention;

FIG. 3 is a right side view of FIG. 2;

fig. 4 is a schematic internal cross-sectional view of fig. 1.

Description of reference numerals:

1. a core hole; 2. self-tapping a groove; 3. the rod part is threaded; 4. tail threads; 5. a pressure relief groove; 6. an operation hole; 7. an inner rod; 8. and (7) installing holes.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1-4, the magnesium alloy compression screw of the present invention comprises a screw rod and a screw tail which are connected in sequence, and a core hole 1 which penetrates through the screw rod from the screw tail, wherein the through structure of the core hole 1 enables a guide pin which penetrates through the core hole 1 to be accurately positioned in an operation, and the guide pin is the existing foundation.

The screw rod is kept away from be provided with pole portion screw thread 3 on the outer wall of spiral shell tail one end, just pole portion screw thread 3 is kept away from the one end of spiral shell tail is provided with self-tapping groove 2, self-tapping of screw can be realized to self-tapping groove 2, no longer needs other drilling tool when the screw of small dimension is screwed in, and implant after the screw of great specification can use drill bit drilling, but even if the condition of using drill bit drilling, the existence of self-tapping groove 2 can make the screw in easier, the diameter of screw is less than the diameter of spiral shell tail to can bury completely in the bone when making the screw implant, can not produce the activity of joint friction or produce negative effects such as unnecessary stimulation to bone peripheral soft tissue.

The outer wall of the screw tail is provided with a tail thread 4, and the tail thread 4 is provided with a plurality of pressure relief grooves 5, preferably, the number of the pressure relief grooves 5 is 3, and in the description of the utility model, unless otherwise stated, "a plurality" means two or more. The pressure relief groove 5 can reduce the pressure strength between the radial direction of the screw and the bone tissue on the premise of not reducing the axial compression strength of the screw as much as possible, so that the screw can be screwed in more easily, the effect of reducing the distance between the bone and the bone is achieved, and the influence of bone burst or nail body and instrument damage is avoided. Meanwhile, the end face, far away from the screw rod, of the screw tail is provided with an operation hole 6 which is recessed inwards and used for being matched with an operation instrument, and the operation instrument is the existing foundation. In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The two pitch of pole portion screw thread 3 and afterbody screw thread 4 is different, the pitch of pole portion screw thread 3 is greater than the pitch of afterbody screw thread 4 to make screw in process and pressurization process evenly go on, use more smoothly, at the in-process of screw implantation, the polished rod part of screw rod sets up at the closed position of bone line, the different pitches of pole portion screw thread 3 and afterbody screw thread 4 has led to the bone at taut closed in-process, can form the effect that draws after running before, thereby makes the laminating of bone inseparabler, plays the pressurized effect.

The screw rod and the screw tail are made of medical degradable materials, and preferably, the screw rod and the screw tail are made of magnesium alloy materials. After one year after the operation of the patient, the screw is taken out without a secondary operation, and the screw can be slowly degraded along with the lapse of time, so that the secondary operation is avoided, and the pain of the patient is relieved.

An internal thread is arranged on the inner wall of the core hole 1, an inner rod 7 is connected with the inner rod through the internal thread, one end of the inner rod 7 extends to the position of the self-tapping groove 2, the other end of the inner rod is arranged at the position close to the operation hole 6, an installation hole 8 is arranged at one end of the inner rod 7 close to the screw tail, and the existence of the inner rod 7 can support a hollow screw to a certain extent, so that a good treatment effect is ensured; the inner rod 7 is made of magnesium alloy, and after one year of operation of a patient, the inner rod 7 is taken out without secondary operation, and the inner rod 7 can be slowly degraded along with the lapse of time, so that the secondary operation is avoided, and the pain of the patient is relieved.

The ratio of the thread pitch of the rod part thread 3 to the thread pitch of the tail part thread 4 is 1.1-1.5, the larger thread pitch arranged at the screw rod is more favorable for a doctor to screw the screw in faster during an operation, and the smaller thread pitch arranged at the screw tail is more favorable for the compression fixation of the screw and bone tissues.

The operation hole 6 is an inner hexagonal hole or an inner hexagonal plum blossom-shaped hole, the inner hexagonal hole or the inner hexagonal plum blossom-shaped hole can be matched with an instrument to implant a screw into a bone, and the specific shape can be selected according to actual conditions.

The pressure relief grooves 5 are axially and uniformly distributed on the surface of the tail thread 4.

In the actual working process, the guide pin is firstly driven into the position of the compression screw to be implanted into the patient, then the compression screw is screwed in along the guide pin, the guide pin is taken out after the compression screw is implanted, the compression screw is left on the bone, and then the inner rod 7 is screwed into the core hole 1, so that the strength of the compression screw is increased.

The use method of the utility model is not limited to the use method of installing the inner rod 7 in the core hole 1, but the compression screw has another use method, namely, after the screw is implanted, the inner rod 7 does not need to be installed in the core hole 1, and the implanted screw can be directly used; however, whether the inner rod 7 needs to be installed in the core hole 1 needs to be determined by a user according to actual needs.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. Magnesium alloy forcing screw, including the screw rod and the spiral shell tail that connect gradually and link up core hole (1) of screw rod from the spiral shell tail, its characterized in that: a rod part thread (3) is arranged on the outer wall of one end, away from the screw tail, of the screw rod, a self-tapping groove (2) is arranged at one end, away from the screw tail, of the rod part thread (3), a tail part thread (4) is arranged on the outer wall of the screw tail, a plurality of pressure relief grooves (5) are arranged on the tail part thread (4), and meanwhile, an operation hole (6) is formed in the end face, away from the screw rod, of the screw tail in an inwards recessed mode; the thread pitches of the rod part thread (3) and the tail part thread (4) are different; the screw rod and the screw tail are made of medical degradable materials.

2. The magnesium alloy compression screw of claim 1, wherein: the inner wall of the core hole (1) is provided with internal threads.

3. The magnesium alloy compression screw of claim 1, wherein: the screw rod and the screw tail are made of magnesium alloy materials.

4. The magnesium alloy compression screw of claim 1, wherein: the thread pitch of the rod part thread (3) is larger than that of the tail part thread (4), and the thread pitch ratio between the rod part thread (3) and the tail part thread (4) is 1.1-1.5.

5. The magnesium alloy compression screw of claim 1, wherein: the operating hole (6) is an inner hexagonal hole or an inner hexagonal plum blossom-shaped hole.

6. The magnesium alloy compression screw of claim 5, wherein: an inner rod (7) is connected to the inner part of the core hole (1) in a threaded manner, one end of the inner rod (7) extends to the position of the self-tapping groove (2), the other end of the inner rod is arranged at the position close to the operation hole (6), and an installation hole (8) is formed in one end, close to the screw tail, of the inner rod (7); the inner rod (7) is made of magnesium alloy.

7. The magnesium alloy compression screw of claim 1, wherein: the pressure relief grooves (5) are axially and uniformly distributed on the surface of the tail thread (4).