Medical instrument screw

Abstract

The utility model relates to the technical field of medical instruments, and discloses a medical instrument screw which comprises a screw body, a tip is fixedly installed at the lower end of the screw body, a single-line thread and a double-line thread are fixedly installed on the outer wall of the screw body, and the double-line thread is located at the upper end of the single-line thread. A screw seat is fixedly installed at the upper end of the screw body, connecting holes are formed in the two sides of the screw seat, and a connecting groove is formed in an inner cavity of the screw seat, when the device is used, through the arranged screw seat, fixation and adjustment between the screw body and a connecting rod are facilitated, the discomfort of a patient is reduced, and the practicability is improved; through the arrangement of the connecting holes, disassembly of the screw body can be assisted, so that the screw disassembly efficiency is improved, through the arrangement of the two sets of fixing grooves, the screw is suitable for screwing of screwdrivers of different models and specifications, so that disassembly and assembly of the screw are facilitated, convenience is improved, and better use prospects can be brought.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a medical device screw. Background Art

[0002] The pedicle is a component of the spine and is often used as an effective point of manipulation and immobilization during vertebral fracture surgery. Pedicle screw fixation was first described by Bouche and has been widely used over the past two decades to treat degenerative and unstable fractures, deformities, and tumors. Pedicle screw systems are used to adjust the spine, maintain its stability, or achieve fusion for patients with fractures, spondylolisthesis, degenerative arthritis, tumors, or scoliosis. Currently, spinal fixation technology has become the primary treatment for thoracolumbar fractures, and its therapeutic effects have been fully recognized in restoring the physiological curvature of the spine and indirectly decompressing the spinal canal. In addition to correcting deformities and restoring sequence, the main purpose of spinal fixation is to provide immediate stability, allowing patients to ambulate early, and reducing the need for braces. The vertebral arch is the hardest part of the vertebral body and the force core of the vertebral body, which can transmit external forces from the posterior column to the vertebral body to achieve three-dimensional fixation.

[0003] However, it still has some disadvantages. For example, the biomechanical properties of the screw-bone interface determine the stability of the pedicle screw system. If the holding force between the interfaces is insufficient, the screw will loosen and lose its function of distraction, reduction and fixation. The design of the pedicle screw can effectively improve the stability of the fixation system. The ideal pedicle screw design should provide sufficient fixation ability while having sufficient self-strength to prevent the screw from loosening, bending or breaking. Moreover, the screw is generally only suitable for installation and removal using one type of screwdriver, and cannot be installed or removed using screwdrivers of different specifications, which reduces its practicality.

[0004] In order to solve the above problems, this application proposes a medical device screw. Utility Model Content

[0005] The purpose of the utility model is to provide a medical device screw to solve the problems of insufficient fixing strength and easy accumulation of impurities in the groove in the prior art proposed in the above background art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a medical device screw, comprising a screw body, a tip fixedly installed at the lower end of the screw body, a single-line thread and a double-line thread fixedly installed on the outer wall of the screw body, and the double-line thread is located at the upper end of the single-line thread, and a screw seat fixedly installed at the upper end of the screw body.

[0007] Preferably, connecting holes are provided on both sides of the screw seat, a connecting groove is provided in the inner cavity of the screw seat, U-shaped grooves are provided on both sides of the screw seat, and an annular thread is fixedly installed on the inner wall of the screw seat.

[0008] Preferably, a connecting rod is detachably mounted on the upper end of the U-shaped groove, a top screw is detachably mounted on the upper end of the connecting rod, a second fixing groove is provided on the upper end of the top screw, and a first fixing groove is provided in the inner cavity of the second fixing groove.

[0009] Preferably, the number of the single-thread and double-thread is multiple groups.

[0010] Preferably, the number of the connecting holes is two groups, and the connecting holes pass through the inner cavity of the screw seat, the number of the annular threads is multiple groups, and the number of the U-shaped grooves is two groups.

[0011] Preferably, the connecting rod passes through both ends of the U-shaped groove and extends to both sides of the screw seat, and the connecting rod is located between the U-shaped groove and the top screw.

[0012] Preferably, the outer wall of the top screw is threadedly connected to one side of the annular thread, the top screw is located at the upper end of the connecting groove, the first fixing groove and the second fixing groove are both set to a cross shape, and the first fixing groove is located in the middle of the second fixing groove.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The U-shaped groove and the annular thread cooperate with each other to facilitate the fixation and adjustment between the screw body and the connecting rod. The connecting rod can be fixed in the U-shaped groove by the top screw, and the disassembly and installation of the top screw are facilitated by the first fixing groove and the second fixing groove, thereby reducing the patient's discomfort and improving the practicality of the device. The holding force of the screw is increased, and the loosening and pulling out of the screw are avoided. The outer diameter and thread depth of the screw itself can be increased, and the pitch can be reduced. The setting of the connecting hole can assist in the disassembly of the screw body, thereby improving the efficiency of screw disassembly.

[0015] The utility model is suitable for twisting with a plurality of screwdrivers of different models and specifications through the mutual cooperation of the first fixing groove and the second fixing groove, so that the top screw can adapt to the disassembly and installation of screwdrivers of different models and specifications, thereby facilitating the disassembly and installation of the screws and improving convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a medical device screw according to the present utility model;

[0017] Figure 2This is a schematic diagram of the overall structure of a screw seat and a top screw of a medical device screw of the utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of a screw seat of a medical device screw of the utility model;

[0019] Figure 4 This is a schematic diagram of the upper end structure of a top screw of a medical device screw according to the present utility model;

[0020] In the figure: 1. Screw body; 2. Tip; 3. Single-line thread; 4. Double-line thread; 5. Screw seat; 6. Connecting hole; 7. Connecting groove; 8. U-shaped groove; 9. Annular thread; 10. Connecting rod; 11. Top screw; 12. First fixing groove; 13. Second fixing groove. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] See also Figure 1-Figure 3 The utility model provides a technical solution: a medical device screw, comprising a screw body 1, a tip 2 is fixedly installed at the lower end of the screw body 1, a single-line thread 3 and a double-line thread 4 are fixedly installed on the outer wall of the screw body 1, and the double-line thread 4 is located at the upper end of the single-line thread 3, a screw seat 5 is fixedly installed on the upper end of the screw body 1, and connecting holes 6 are provided on both sides of the screw seat 5. Through the setting of the connecting holes 6, the disassembly of the screw body 1 can be assisted, thereby improving the efficiency of disassembly of the screw body 1, the inner cavity of the screw seat 5 is provided with a connecting groove 7, and U-shaped grooves 8 are provided on both sides of the screw seat 5. The inner wall of the screw seat 5 is fixedly installed with an annular thread 9, the number of single-line threads 3 and double-line threads 4 is multiple groups, the number of connecting holes 6 is two groups, and the connecting holes 6 pass through the inner cavity of the screw seat 5. Cavity, the number of annular threads 9 is multiple groups, the number of U-shaped grooves 8 is two groups, the connecting rod 10 passes through both ends of the U-shaped groove 8 and extends to both sides of the screw seat 5, and the connecting rod 10 is located between the U-shaped groove 8 and the top screw 11. Through the mutual cooperation of the screw seat 5, the connecting hole 6, the connecting groove 7, the U-shaped groove 8 and the annular thread 9 in the screw body 1, it is convenient for the screw body 1 to be fixed and adjusted. The connecting rod 10 can be fixed in the U-shaped groove 8 by the top screw 11, and the disassembly and installation of the top screw 11 are facilitated by the first fixing groove 12 and the second fixing groove 13, thereby reducing the patient's discomfort, improving the practicality of the device, improving the holding force of the screw, avoiding loosening and pulling out of the screw, and being able to increase the outer diameter and thread depth of the screw itself and reduce the pitch.

[0023] In this embodiment, Figure 4As shown, a connecting rod 10 is detachably mounted on the upper end of the U-shaped groove 8, and a top screw 11 is detachably mounted on the upper end of the connecting rod 10. A second fixing groove 13 is provided on the upper end of the top screw 11, and a first fixing groove 12 is provided in the inner cavity of the second fixing groove 13. The outer wall of the top screw 11 is threadedly connected to one side of the annular thread 9, and the top screw 11 is located at the upper end of the connecting groove 7. The first fixing groove 12 and the second fixing groove 13 are both arranged in a cross shape, and the first fixing groove 12 is located in the middle of the second fixing groove 13. Through the mutual cooperation of the set first fixing groove 12 and the second fixing groove 13, it is suitable for twisting of a variety of screwdrivers of different models and specifications, so that the top screw 11 adapts to the disassembly and installation of screwdrivers of different models and specifications, thereby facilitating the disassembly and installation of the screw body 1 and improving convenience.

[0024] Working principle:

[0025] The screw seat 5, connecting hole 6, connecting groove 7, U-shaped groove 8 and annular thread 9 in the screw body 1 are arranged to cooperate with each other, so that the screw body 1 and the connecting rod 10 are fixed and adjusted. The connecting rod 10 can be fixed in the U-shaped groove 8 by the top screw 11. The first fixing groove 12 and the second fixing groove 13 are used to facilitate the disassembly and installation of the top screw 11, thereby reducing the patient's discomfort and improving the practicality of the device. The holding force of the screw is improved to avoid the loosening and pulling out of the screw. The outer diameter and thread depth of the screw itself can be increased and the pitch is reduced. The setting of the connecting hole 6 can assist the disassembly of the screw body 1, thereby improving the efficiency of the disassembly of the screw body 1. The mutual cooperation of the first fixing groove 12 and the second fixing groove 13 is suitable for the twisting of a variety of screwdrivers of different models and specifications, so that the top screw 11 adapts to the disassembly and installation of screwdrivers of different models and specifications, thereby facilitating the disassembly and installation of the screw body 1 and improving convenience.

[0026] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A medical device screw, comprising a screw body (1), characterized in that: The lower end of the screw body (1) is fixedly mounted with a tip (2), the outer wall of the screw body (1) is fixedly mounted with a single-thread thread (3) and a double-thread thread (4), and the double-thread thread (4) is located at the upper end of the single-thread thread (3), and the upper end of the screw body (1) is fixedly mounted with a screw seat (5).

2. The medical device screw according to claim 1, characterized in that: Both sides of the screw seat (5) are provided with connection holes (6), the inner cavity of the screw seat (5) is provided with a connection groove (7), both sides of the screw seat (5) are provided with U-shaped grooves (8), and the inner wall of the screw seat (5) is fixedly provided with an annular thread (9).

3. The medical device screw according to claim 2, characterized in that: A connecting rod (10) is detachably mounted on the upper end of the U-shaped groove (8), a top screw (11) is detachably mounted on the upper end of the connecting rod (10), a second fixing groove (13) is provided at the upper end of the top screw (11), and a first fixing groove (12) is provided in the inner cavity of the second fixing groove (13).

4. The medical device screw according to claim 1, characterized in that: The number of the single-thread (3) and double-thread (4) is multiple groups.

5. The medical device screw according to claim 2, characterized in that: The number of the connecting holes (6) is two groups, and the connecting holes (6) pass through the inner cavity of the screw seat (5); the number of the annular threads (9) is multiple groups, and the number of the U-shaped grooves (8) is two groups.

6. The medical device screw according to claim 3, characterized in that: The connecting rod (10) passes through both ends of the U-shaped groove (8) and extends to both sides of the screw seat (5), and the connecting rod (10) is located between the U-shaped groove (8) and the top screw (11).

7. The medical device screw according to claim 3, characterized in that: The outer wall of the top screw (11) is threadedly connected to one side of the annular thread (9), and the top screw (11) is located at the upper end of the connecting groove (7). The first fixing groove (12) and the second fixing groove (13) are both arranged in a cross shape, and the first fixing groove (12) is located in the middle of the second fixing groove (13).

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