Anti-reverse-rotation screwdriver

Abstract

The utility model provides a screw driver capable of preventing reverse rotation. The screw driver comprises a handle, an outer tube and an inner rod, a through hole is formed in the handle in the axial direction of the handle. The outer pipe is arranged at the far end of the handle and communicated with the through hole, and the far end of the outer pipe is provided with a reverse rotation preventing structure which is used for being connected with a test mold in a matched mode; the inner rod is arranged in the through hole and the outer pipe in a penetrating mode, and the far end of the inner rod extends out of the anti-reverse-rotation structure and is used for being connected with the test mold. According to the anti-reverse-rotation screw driver provided by the utility model, the anti-reverse-rotation structure is arranged at the far end of the outer pipe and is matched and connected with the test mold, so that the outer pipe is prevented from reversely rotating relative to the test mold when the screw driver is connected with the test mold, and the reliability when the screw driver is matched and connected with the test mold is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to an anti-reverse rotation screwdriver. Background Art

[0002] Spinous process distractor surgery is a surgical procedure for treating lumbar diseases. It mainly involves implanting a distractor made of H-shaped titanium alloy steel plates between the posterior spinous processes of the lumbar spine to distract the vertebral lamina and expand the intervertebral foramen, thereby indirectly releasing the nerve roots. This surgery can maintain the height, width, and height of the lumbar intervertebral foramen of the lumbar spine in a long-term and stable manner, meeting the movement requirements of the lumbar spine in six directions: flexion, extension, left and right scoliosis, and rotation.

[0003] Before the spinous process spreader surgery begins, the patient's lesion area needs to be measured, and after obtaining the corresponding size, a spinous process spreader of similar size is selected for implantation. During this process, a trial mold and a corresponding screwdriver are required. The trial molds and screwdrivers currently on the market have the following problems:

[0004] 1. The screwdriver and the test mold tend to loosen after assembly.

[0005] 2. The screwdriver is prone to reverse thread rotation during use, causing the test mold to fall off.

[0006] The above situation may have an adverse effect on the effect and safety of the operation. Therefore, how to improve the technical problems existing in the prior art is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0007] The utility model aims to provide an anti-reverse rotation screwdriver, which can prevent the outer tube from reversely rotating relative to the test mold, improve the reliability of the screwdriver and the test mold when they are matched and connected, thereby improving the success rate of the operation and the treatment effect.

[0008] To achieve the above-mentioned object, in a first aspect, the utility model provides an anti-reverse rotation screwdriver, comprising a handle, an outer tube and an inner rod;

[0009] The handle is provided with a through hole along its axial direction;

[0010] The outer tube is arranged at the distal end of the handle and is in communication with the through hole. The distal end of the outer tube has an anti-reverse rotation structure, and the anti-reverse rotation structure is used to cooperate with the test mold for connection;

[0011] The inner rod is inserted into the through hole and the outer tube, and the distal end of the inner rod extends out from the anti-reverse rotation structure to be connected with the test mold.

[0012] In some embodiments, the outer side wall of the distal end of the outer tube is provided with at least two protrusions in an annular shape, so that the distal end of the outer tube forms the anti-reverse rotation structure;

[0013] The trial mold is provided with a fixing groove, and the fixing groove is adapted to the anti-reverse rotation structure.

[0014] In some embodiments, a connection hole is provided at the bottom of the fixing groove;

[0015] The distal end of the inner rod is a connecting end, and the connecting end extends out of the anti-reverse rotation structure and is threadedly connected to the connecting hole.

[0016] In some embodiments, the anti-reverse rotation screwdriver further includes an elastic limiting member;

[0017] The outer side wall of the inner rod is provided with a mounting groove, the mounting groove is close to the proximal end of the inner rod, and the limiting member is arranged in the mounting groove and protrudes from the mounting groove;

[0018] A limiting groove is provided in the through hole, and the limiting groove is close to the proximal end of the handle;

[0019] When the inner rod is inserted into the through hole, the portion of the limiting member protruding from the mounting groove can be embedded in the limiting groove.

[0020] In some embodiments, an insert is provided at the proximal end of the handle;

[0021] The insert is provided with a channel along its axial direction, the limiting groove is provided on the inner side wall of the channel, the insert is located in the through hole, and the channel is coaxial with the through hole.

[0022] In some embodiments, a mounting hole is provided at the proximal end of the handle, and the mounting hole is connected to the through hole;

[0023] The insert is arranged in the mounting hole.

[0024] In some embodiments, a slot is formed on the proximal end surface of the handle, and the slot extends to the inner side wall of the mounting hole;

[0025] A proximal outer side wall of the insert is provided with a protruding structure, and the protruding structure is engaged with the slot.

[0026] In some embodiments, the slot is an arc-shaped slot, the protruding structure is an arc-shaped protruding block, and the arc-shaped protruding block and the arc-shaped slot are interference fit.

[0027] In some embodiments, the limiting member is an annular retaining spring, and the mounting groove and the limiting groove are both annular grooves.

[0028] In some embodiments, further comprising a fixing pin;

[0029] At least one positioning groove is formed on the outer wall of the proximal end of the outer tube, and the proximal end of the outer tube is inserted into the through hole of the handle;

[0030] The handle is provided with a pin hole corresponding to the positioning groove, and the pin hole is connected to the through hole;

[0031] The fixing pin passes through the pin hole, and one end thereof abuts against the positioning groove.

[0032] The beneficial effects of the anti-reverse rotation screwdriver provided by the utility model are as follows:

[0033] 1. By setting an anti-reverse rotation structure at the far end of the outer tube and connecting it with the test mold, the outer tube is prevented from rotating reversely relative to the test mold when the screwdriver is connected to the test mold, thereby improving the reliability of the screwdriver and the test mold when connected.

[0034] 2. By arranging a limit piece on the inner rod to cooperate with the handle, the inner rod is prevented from being separated from the outer tube when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the structure of a screwdriver for preventing reverse rotation according to an embodiment of the utility model;

[0036] Figure 2 A cross-sectional view of the handle of the embodiment provided by the utility model along its axial direction;

[0037] Figure 3 A front view of the outer tube of the embodiment provided by the utility model;

[0038] Figure 4 A schematic diagram of the structure of the test mold of the embodiment provided by the utility model;

[0039] Figure 5 A side view of the outer tube of the embodiment provided by the utility model;

[0040] Figure 6 A schematic diagram of the structure of the position limiting member provided in the embodiment of the utility model;

[0041] Figure 7 A schematic diagram of the structure of the inner rod in the embodiment provided by the utility model;

[0042] Figure 8 A cross-sectional view of an insert according to an embodiment of the utility model along its axial direction;

[0043] Fig. 9 A side view of an insert according to an embodiment of the present invention;

[0044] Fig.10 This is a side view of the handle of the embodiment provided by the utility model.

[0045] Reference numerals:

[0046] Handle 1, through hole 11, mounting hole 12, slot 13, pin hole 14, outer tube 2, anti-reverse rotation structure 21, protrusion 211, positioning slot 22, inner rod 3, connecting end 31, mounting slot 32, trial mold 4, fixing slot 41, connecting hole 42, limit piece 5, insert 6, limit slot 61, channel 62, protrusion structure 63, fixing pin 7. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with general skills in the field to which the utility model belongs. "Including" and similar words used in this article mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0048] As used herein, the term "distal end" refers to the end that is away from the operator and closer to the patient; the term "proximal end" refers to the end that is closer to the operator and away from the patient.

[0049] refer to Figures 1 to 4 As shown, an embodiment of the utility model provides an anti-reverse rotation screwdriver, comprising a handle 1, an outer tube 2 and an inner rod 3. The handle 1 is provided with a through hole 11 along its axial direction, and the proximal end of the outer tube 2 is inserted into the distal end of the handle 1 so that the outer tube 2 is connected with the through hole 11. The distal end of the outer tube 2 is provided with an anti-reverse rotation structure 21, and the anti-reverse rotation structure 21 is used to cooperate with the test mold 4. The inner rod 3 is inserted into the through hole 11 and the outer tube 2, and the distal end of the inner rod 3 extends from the anti-reverse rotation structure 21 for connection with the test mold 4.

[0050] Specifically, combined Figure 5As shown, the outer side wall of the distal end of the outer tube 2 is provided with at least two protrusions 211 in an annular shape, and at least two of the protrusions 211 are spaced apart on the outer side wall of the distal end of the outer tube 2, so that the anti-reverse rotation structure 21 is formed at the distal end of the outer tube 2. The test mold 4 is provided with a fixing groove 41 corresponding to the anti-reverse rotation structure 21, and the fixing groove 41 is adapted to the anti-reverse rotation structure 21, and a connecting hole 42 is provided at the bottom of the fixing groove 41, and the connecting hole 42 is a threaded hole. The distal end of the inner rod 3 is a connecting end 31, and the outer side wall of the connecting end 31 is provided with a threaded structure that cooperates with the threaded hole. When the connecting end 31 passes through the through hole 11 and the outer tube 2 in sequence and extends out of the anti-reverse rotation structure 21, the connecting end 31 can be threadedly connected to the connecting hole 42 by rotating the inner rod 3, thereby realizing the fixed connection between the screwdriver and the test mold 4.

[0051] In this embodiment, an anti-reverse rotation structure 21 is provided at the distal end of the outer tube 2 to cooperate with the fixed groove 41 of the test mold 4 to prevent the outer tube 2 from rotating relative to the test mold 4 when the inner rod 3 is rotationally connected to the test mold 4, thereby improving the reliability of the screwdriver and the test mold 4 when they are cooperated and connected.

[0052] refer to Figure 5 As shown, in some embodiments, the protrusion 211 is an arc-shaped protrusion block.

[0053] refer to Figure 2 , Figure 6 and Figure 7 As shown, in some embodiments, the anti-reverse rotation screwdriver further includes an elastic limiting member 5. The outer side wall of the inner rod 3 is provided with a mounting groove 32, and the mounting groove 32 is arranged near the proximal end of the inner rod 3. The limiting member 5 is arranged in the mounting groove 32 and protrudes from the mounting groove 32. A limiting groove is arranged in the through hole 11, and the limiting groove is close to the proximal end of the handle 1. When the inner rod 3 is inserted into the through hole 11, the limiting member 5 will be squeezed and deformed. When the inner rod 3 is pushed, the part of the limiting member 5 protruding from the mounting groove 32 can be embedded in the limiting groove, thereby achieving a blocking and limiting effect, and preventing the inner rod 3 from being separated from the outer tube 2 during use.

[0054] It should be noted that, since the handle 1 made of plastic material is light and cheap, plastic material is often used as the material of the handle 1. However, the processing precision of the handle 1 made of plastic material is low, which will affect the function of the limiter 5. Figure 8 and Fig. 9As shown, in this embodiment, an insert 6 is made of metal material and is arranged at the proximal end of the handle 1. The insert 6 is provided with a channel 62 along its axial direction. The limiting groove 61 is provided on the inner side wall of the channel 62. The insert 6 is located in the through hole 11, and the channel 62 is coaxial with the through hole 11.

[0055] Therefore, when the inner rod 3 passes through the passage 62, the through hole 11 and the outer tube 2 in sequence, the stopper 5 will move into the stopper groove 61 provided on the insert 6, thereby achieving blocking and limiting. In this embodiment, the insert 6 is provided to improve the accuracy of the screwdriver, ensuring that the stopper 5 achieves blocking and limiting functions.

[0056] Further, refer to Figure 2 , Figures 8 to 10 As shown, a mounting hole 12 is opened at the proximal end of the handle 1, and the mounting hole 12 is connected to the through hole 11, so that the mounting hole 12 forms a countersunk hole structure, and the insert 6 is embedded in the mounting hole 12, so that the channel 62 is coaxially arranged with the through hole 11.

[0057] In some embodiments, in order to improve the stability of the connection between the insert 6 and the handle 1 , the insert 6 may be embedded in the mounting hole 12 after being coated with glue on the outer side wall.

[0058] In some embodiments, reference Fig. 9 and Fig.10 As shown, a slot 13 is provided on the proximal end surface of the handle 1 , and the slot 13 extends to the inner wall of the mounting hole 12 , and a protruding structure 63 is provided on the proximal outer wall of the insert 6 , and the protruding structure 63 is engaged with the slot 13 .

[0059] In this embodiment, the slot 13 is an arc-shaped slot, and the two slots 13 are relatively arranged on both sides of the mounting hole 12, and the protruding structure 63 is an arc-shaped protruding block. The arc-shaped protruding block and the arc-shaped slot are interference fit to improve the reliability of the connection between the handle 1 and the insert 6.

[0060] In some embodiments, the limiting member 5 is an annular retaining spring, and the mounting groove 32 and the limiting groove 61 are both annular grooves. The limiting member 5 is sleeved in the mounting groove 32, and when the inner lever is pushed to move in the handle 1, the limiting member 5 will move into the limiting groove 61, thereby playing a limiting role.

[0061] In some embodiments, the screwdriver further includes a fixing pin 7. At least one positioning groove 22 is provided on the proximal outer side wall of the outer tube 2, and the proximal end of the outer tube 2 is inserted into the through hole 11 of the handle 1, and the handle 1 is provided with a pin hole 14 corresponding to the positioning groove 22, and the pin hole 14 is connected to the through hole 11. The fixing pin 7 is passed through the pin hole 14, and one end of the fixing pin 7 extends into the positioning groove 22 for abutting against the positioning groove 22, so as to fix the handle 1 and the outer tube 2 and prevent the handle 1 from rotating relative to the outer tube 2.

[0062] In some embodiments of the present invention, the outer tube 2 can be connected to the handle 1 by interference fit, that is, the outer diameter of the outer tube 2 is set to be slightly larger than the inner diameter of the through hole 11. In addition, a connecting glue can be applied to the outer side wall of the proximal end of the outer tube 2 and the inner side wall of the through hole 11 to further improve the stability of the connection between the handle 1 and the outer tube 2.

[0063] In some embodiments, the outer tube 2 can also be threadedly connected to the handle 1, specifically, by providing a threaded structure on the outer side wall of the proximal end of the outer tube 2 and providing a threaded hole at the distal end of the through hole 11, so as to achieve the threaded connection between the outer tube 2 and the handle 1. In this embodiment, the fixing pin 7 can also be used in conjunction to further fix the handle 1 and the outer tube 2 to prevent the handle 1 from rotating relative to the outer tube 2.

[0064] Although the embodiments of the present invention are described in detail above, it is obvious to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention. Moreover, the present invention described herein may have other embodiments and may be implemented or realized in a variety of ways.

Claims

1. A screwdriver for preventing reverse rotation, characterized in that: It includes a handle, an outer tube and an inner rod; The handle is provided with a through hole along its axial direction; The outer tube is arranged at the distal end of the handle and is in communication with the through hole. The distal end of the outer tube has an anti-reverse rotation structure, and the anti-reverse rotation structure is used to cooperate with the test mold for connection; The inner rod is inserted into the through hole and the outer tube, and the distal end of the inner rod extends out from the anti-reverse rotation structure to be connected with the test mold.

2. The anti-reverse rotation screwdriver according to claim 1, characterized in that: The outer side wall of the distal end of the outer tube is provided with at least two protrusions in a ring shape, so that the distal end of the outer tube forms the anti-reverse rotation structure; The trial mold is provided with a fixing groove, and the fixing groove is adapted to the anti-reverse rotation structure.

3. The anti-reverse rotation screwdriver according to claim 2, characterized in that: A connecting hole is provided at the bottom of the fixing groove; The distal end of the inner rod is a connecting end, and the connecting end extends out of the anti-reverse rotation structure and is threadedly connected to the connecting hole.

4. The anti-reverse rotation screwdriver according to claim 1, characterized in that: Also includes a limiter with elasticity; The outer side wall of the inner rod is provided with a mounting groove, the mounting groove is close to the proximal end of the inner rod, and the limiting member is arranged in the mounting groove and protrudes from the mounting groove; A limiting groove is provided in the through hole, and the limiting groove is close to the proximal end of the handle; When the inner rod is inserted into the through hole, the portion of the limiting member protruding from the mounting groove can be embedded in the limiting groove.

5. The anti-reverse rotation screwdriver according to claim 4, characterized in that: An insert is provided at the proximal end of the handle; The insert is provided with a channel along its axial direction, the limiting groove is provided on the inner side wall of the channel, the insert is located in the through hole, and the channel is coaxial with the through hole.

6. The anti-reverse rotation screwdriver according to claim 5, characterized in that: A mounting hole is provided at the proximal end of the handle, and the mounting hole is connected to the through hole; The insert is arranged in the mounting hole.

7. The anti-reverse rotation screwdriver according to claim 6, characterized in that: A slot is formed on the proximal end surface of the handle, and the slot extends to the inner side wall of the mounting hole; A proximal outer side wall of the insert is provided with a protruding structure, and the protruding structure is engaged with the slot.

8. The anti-reverse rotation screwdriver according to claim 7, characterized in that: The clamping groove is an arc-shaped groove, the protruding structure is an arc-shaped protruding block, and the arc-shaped protruding block and the arc-shaped groove are interference-fitted.

9. The anti-reverse rotation screwdriver according to claim 4, characterized in that: The limiting member is an annular retaining spring, and the mounting groove and the limiting groove are both annular grooves.

10. The anti-reverse rotation screwdriver according to any one of claims 1 to 9, characterized in that: Also included is a retaining pin; At least one positioning groove is formed on the outer wall of the proximal end of the outer tube, and the proximal end of the outer tube is inserted into the through hole of the handle; The handle is provided with a pin hole corresponding to the positioning groove, and the pin hole is connected to the through hole; The fixing pin passes through the pin hole, and one end thereof abuts against the positioning groove.

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