A pedicle screw for robot

Abstract

The present invention relates to a pedicle screw for a robot, the pedicle screw comprising: an outer screw, a first hollow portion is arranged inside the outer screw, an inner thread is arranged on the inner wall of the first hollow portion, a first adjusting portion is arranged at the lower part of the first hollow portion; the first adjusting portion comprises two outer convex cavities arranged at both sides of the first hollow portion, a stopper is arranged in the outer convex cavity; an inner screw, a second hollow portion is arranged inside the inner screw, an outer thread matching the inner thread is arranged on the outer wall of the inner screw, a second adjusting portion is arranged at the upper part of the inner screw; the second adjusting portion comprises two inner concave cavities arranged at both sides of the inner screw, positioning grooves are arranged on the two side walls of the inner concave cavity, and the first elastic protrusion is arranged in the positioning groove. The present invention can realize direct nail placement of the robot without a guide pin, thereby improving the efficiency of nail placement of the robot.

Description

Technical Field

[0001] The invention relates to medical instruments, in particular to a pedicle screw for a robot. Background Art

[0002] The common surgical method for vertebral fractures is to insert pedicle screws. The current robot technology can improve the accuracy of screw placement and achieve minimal invasiveness, thereby improving efficiency. However, because pedicle screws are relatively thick, they cannot be directly drilled by robots, and can only be placed with the assistance of robots. That is, the robot is used to locate and insert the guide pin, and then the screw is manually drilled along the guide pin. Therefore, there is an urgent need for a method that allows robots to directly insert pedicle screws. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a pedicle screw to improve the efficiency of robot screw placement in view of the deficiencies in the prior art.

[0004] Technical solution: The present invention provides a pedicle screw for a robot, the pedicle screw comprising:

[0005] An external screw, wherein a first hollow portion is provided inside the external screw, an internal thread is provided on the inner wall of the first hollow portion, and a first adjusting portion is provided at the lower portion of the first hollow portion; the first adjusting portion comprises two outer convex cavities arranged on both sides of the first hollow portion, and a limiting member is provided in the outer convex cavity; the limiting member comprises a rotating wheel, and the rotating wheel is rotatably connected to the inner wall of the outer convex cavity, an inner limiting column is provided at one end of the rotating wheel, and an outer limiting column is provided at the other end of the rotating wheel, and first elastic protrusions are provided on both sides of the inner limiting column, and a second elastic protrusion is provided on the outer end of the outer limiting column, and the second elastic protrusion passes through the outer convex cavity to the outside of the external screw, and the side of the outer limiting column is connected to the outer convex cavity through an elastic member;

[0006] An inner screw, wherein a second hollow portion is provided inside the inner screw, an outer thread matching the inner thread is provided on the outer wall of the inner screw, and a second adjustment portion is provided on the upper portion of the inner screw; the second adjustment portion includes two inner concave cavities provided on both sides of the inner screw, positioning grooves are provided on both side walls of the inner concave cavity, and the first elastic protrusion is placed in the positioning groove.

[0007] Preferably, the pedicle screw further comprises a push plate, which is disposed at the inner upper portion of the second hollow portion and can move linearly along the second hollow portion, and the push plate is fixedly connected to the top of the first hollow portion via a push rod.

[0008] Preferably, the upper side of the outer limiting column is connected to the outer convex cavity through an elastic member.

[0009] Preferably, the first elastic protrusion and the second elastic protrusion are both elastic positioning pins.

[0010] Preferably, the ends of the first elastic protrusion and the second elastic protrusion are both configured to be blunt cone-shaped.

[0011] Preferably, the elastic member is a spring; the spring is in a compressed or extended state.

[0012] Preferably, the push rod is fixedly connected to the top of the first hollow portion through a V-shaped connecting rod or a U-shaped connecting rod.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a pedicle screw for a robot, which is composed of an outer screw and an inner screw. Not only can the robot directly place the screw without a guide pin, thereby improving the efficiency of the robot's screw placement, but the screw can also be explanted into the bone to increase the holding force of the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of an embodiment of the present invention.

[0015] Figure 2 Schematic diagram of the structure of the external screw in an embodiment of the present invention.

[0016] Figure 3 Schematic diagram of the structure of the inner screw in the embodiment of the present invention.

[0017] In the accompanying drawings, 10-external screw, 11-first hollow part, 12-internal thread, 13-external convex cavity, 14-rotating wheel, 15-inner limiting column, 16-external limiting column, 17-first elastic locating pin, 18-second elastic locating pin, 19-spring, 20-inner screw, 21-second hollow part, 22-external thread, 23-inner concave cavity, 24-locating groove, 30-push plate, 31-push rod, 32-V-shaped connecting rod. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is described in detail below through specific embodiments and drawings, but the protection scope of the present invention is not limited to the embodiments. Example

[0019] A pedicle screw for a robot, referring to Figure 1-3 The pedicle screw comprises an outer screw 10 , an inner screw 20 and a push plate 30 .

[0020] Specifically, a cylindrical first hollow portion 11 is provided at the center of the outer screw 10, the first hollow portion 11 passes through the outer screw 10, an internal thread 12 is provided on the inner wall of the first hollow portion 11, and a first adjusting portion is provided at the lower portion of the first hollow portion 11; the first adjusting portion includes two outer convex cavities 13 provided on both sides of the first hollow portion 11, the outer convex cavity 13 is equivalent to being embedded in the solid part of the outer screw 10, and a limiter is provided inside the outer convex cavity 13; the limiter includes a rotating wheel 14, and the rotating wheel 14 is rotatably connected to the inner wall of the outer convex cavity 13 through a bearing. Then, an inner limit column 15 is provided at one end of the rotating wheel 14, and an outer limit column 16 is provided at the other end of the rotating wheel 14. Both sides of the inner limit column 15 are provided with a first elastic locating pin 17, and the outer end of the outer limit column 16 is provided with a second elastic locating pin 18. The second elastic locating pin 18 penetrates the outer convex cavity 13 to the outside of the outer screw 10, and the ends of the first elastic locating pin 17 and the second elastic locating pin 18 are both configured as blunt cones; the upper side of the outer limit column 16 is connected to the inner wall of the outer convex cavity 13 through a spring 19, and the spring 19 is in an extended state.

[0021] Specifically, the inner screw 20 uses a screw with a smaller inner diameter, and a cylindrical second hollow portion 21 is provided inside the inner screw 20. The second hollow portion 21 passes through the inner screw 20, and an outer thread 22 matching the inner thread 12 is provided on the outer wall of the inner screw 20. A second adjustment portion is provided on the upper portion of the inner screw 20; the second adjustment portion includes two inner concave cavities 23 embedded in the two sides of the inner screw 20, and positioning grooves 24 are provided on the two side walls of each inner concave cavity 23, and the first elastic positioning pin 17 is placed in the positioning groove 24.

[0022] Specifically, the push plate 30 is placed in the inner upper part of the second hollow portion 21 and can move linearly along the second hollow portion 21. The diameter of the push plate 30 is approximately equal to the inner diameter of the second hollow portion 21, so that the outer periphery of the push plate 30 contacts the inner wall of the second hollow portion 21. The push rod 31 is installed at the upper end of the push plate 30, and the push rod 31 is fixedly connected to the top of the first hollow portion 11 through a V-shaped connecting rod 32. The top ends of the two sides of the V-shaped connecting rod 32 are fixed on the inner wall of the second hollow portion 21, and the triangular support can improve the stability of the push rod 31.

[0023] The working principle and specific effects of this embodiment are as follows: When performing vertebral fracture surgery, the pedicle screw of this embodiment is used, the top of the outer screw 10 is fixed on the robot, and the inner screw 20 is aligned with the part where the screw needs to be placed. The robot can drive the pedicle screw to rotate as a whole, first driving the inner screw 20 to rotate. Since the inner diameter of the inner screw 20 is small, it has a similar effect to a probe nail and can easily penetrate into the interior of the bone cortex, providing a better buffer entrance for the entry of the outer screw 10. As the robot rotates, the inner screw 20 continues to penetrate until the connection node between the inner screw 20 and the outer screw 10, i.e., the first and second adjustment parts, are close to the pedicle, so as to Figure 1Taking the adjusting part on the right side of the middle as an example, due to the obstruction of the pedicle, an upward resistance is applied to the second elastic positioning pin 18, so that the second elastic positioning pin 18 shrinks into the outer convex cavity 13, and the resilience of the spring 19 pulls the outer limit column 16 to move upward, driving the rotating wheel 14 to rotate counterclockwise, pulling the inner limit column 15 to move downward, and at the same time applying a downward force to the first elastic positioning pin 17, so that the first elastic positioning pin 17 withdraws from the positioning groove 24, passes through the inner concave cavity 23 and moves downward, so that the upward resistance of the inner screw 20 disappears, and the inner thread 12 rotates to the outer thread 22, driving the inner The screw 20 moves upward along the first hollow portion 11, and with the further rotation of the robot, the outer screw 10 smoothly enters the interior of the bone cortex, thereby enabling the robot to directly insert the screw without a guide pin, thereby improving the efficiency of the robot's screw insertion; at the same time, with the relative movement of the outer screw 10 and the inner screw 20, the push plate 30 moves downward along the second hollow portion 21. As the inner screw 20 enters, the second hollow portion 21 is filled with bone debris. Under the action of the push plate 30, the bone debris is pushed back into the interior of the bone cortex, which has the effect of screw explantation, thereby increasing the holding force of the screw.

[0024] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and details may be made without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A pedicle screw for a robot, characterized in that: The pedicle screw comprises: An external screw, wherein a first hollow portion is provided in the external screw, an internal thread is provided on the inner wall of the first hollow portion, and a first adjusting portion is provided at the lower portion of the first hollow portion; the first adjusting portion comprises two outer convex cavities arranged on both sides of the first hollow portion, a limiting member is provided in the outer convex cavity; the limiting member comprises a rotating wheel, the rotating wheel is rotatably connected to the inner wall of the outer convex cavity, one end of the rotating wheel is provided with an inner limiting column, and the other end of the rotating wheel is provided with an outer limiting column, both sides of the inner limiting column are provided with a first elastic protrusion, the outer end of the outer limiting column is provided with a second elastic protrusion, the second elastic protrusion penetrates the outer convex cavity to the outside of the external screw, and the side of the outer limiting column is connected to the outer convex cavity through an elastic member; the upper side of the outer limiting column is connected to the outer convex cavity through an elastic member; the first elastic protrusion and the second elastic protrusion are both elastic locating pins; the ends of the first elastic protrusion and the second elastic protrusion are both arranged as blunt cones; the elastic member is a spring; the spring is in a compressed or extended state; An inner screw, wherein a second hollow portion is provided in the inner screw, an outer wall of the inner screw is provided with an outer thread matching the inner thread, and an upper portion of the inner screw is provided with a second adjusting portion; the second adjusting portion comprises two inner concave cavities provided on both sides of the inner screw, and positioning grooves are provided on both side walls of the inner concave cavities, and the first elastic protrusion is placed in the positioning groove; It also includes a push plate, which is placed in the inner upper part of the second hollow part and can move linearly along the second hollow part. The push plate is fixedly connected to the top of the first hollow part through a push rod.

2. The pedicle screw according to claim 1, characterized in that: The push rod is fixedly connected to the top of the first hollow part through a V-shaped connecting rod or a U-shaped connecting rod.

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