A real-time monitoring device for lifting force of lumbar spondylolisthesis and its use method

Abstract

The present invention discloses a real-time monitoring device for lifting force of lumbar spondylolisthesis and a method for using the same, comprising a lifting rod, a fixed knob rod, a lifting force monitoring system and a screwdriver; the lifting rod is hollow inside; the fixed knob rod is inserted into the lifting rod from the rear end thereof, the fixed knob rod comprising a first knob rod and a second knob rod which are rotatably connected to each other, the second knob rod being threadedly engaged in the lifting rod; the lifting force monitoring system comprising a hollow knob assembly and a monitoring assembly, the hollow knob assembly being connected to the tail end of the second knob rod, and the monitoring assembly being connected to the hollow knob assembly; the screwdriver is movably inserted into the fixed knob rod and the hollow knob assembly, the head end of the screwdriver can move axially in the fixed knob rod, and the tail end of the screwdriver is located outside the hollow knob assembly.

Description

Technical Field

[0001] The invention relates to a real-time monitoring device for lifting and pulling force of lumbar spondylolisthesis and a use method thereof, belonging to the technical field of medical devices. Background Art

[0002] Lumbar spondylolisthesis is a common disease in spinal surgery. When conservative treatment fails, surgical treatment is required. Although spondylolisthesis reduction is not the ultimate goal of lumbar spondylolisthesis surgery, spondylolisthesis reduction has the advantages of increasing the area of ​​bone graft fusion, restoring the physiological curvature and weight-bearing curve of the lumbar sacral spine, etc. Therefore, in actual operation, most doctors still regard spondylolisthesis reduction as part of surgical treatment and try to achieve or approach anatomical reduction as much as possible. However, due to the different degrees of stiffness, bone density and degree of intraoperative intervertebral disc loosening of the patient's spondylolisthesis, the screw lifting force required for spondylolisthesis reduction is also different. If forced lifting reduction is performed, it often causes screw pullout. Once the screw is pulled out, the biomechanical strength will be significantly reduced after the screw is inserted again, and the risk of nerve damage will also increase. Therefore, how to monitor the lifting force in real time during the lifting and reduction of spondylolisthesis, so as to evaluate the risk of screw pullout and take corresponding measures to avoid screw pullout in time, has very important guiding significance for clinical practice. Summary of the invention

[0003] In response to the above problems, the purpose of the present invention is to provide a real-time monitoring device for lumbar spondylolisthesis lifting force and a method of using the same. The device can display in real time the lifting force applied to the screws during lumbar spondylolisthesis reduction, ensure that the lifting force is below the threshold during the reduction and slippage process, and avoid screw pullout as much as possible.

[0004] To achieve the above-mentioned object, the present invention adopts the following technical scheme: a real-time monitoring device for lifting force of lumbar spondylolisthesis, comprising a lifting rod, a fixed knob rod, a lifting force monitoring system and a screwdriver;

[0005] The lifting rod is hollow inside, and the head end can be clamped and matched with the tail cap of the screw, and at least two sides near the head end are provided with side slits for the screw connecting rod to pass through;

[0006] The fixed knob rod is inserted into the lifting rod from the rear end thereof, and the fixed knob rod comprises a first knob rod and a second knob rod rotatably connected to each other, the first knob rod and the second knob rod are both hollow structures, the head end of the first knob rod can form a stable abutment with the screw connecting rod, and the second knob rod is threadedly engaged in the lifting rod;

[0007] The lifting force monitoring system includes a hollow knob assembly and a monitoring assembly. The hollow knob assembly is connected to the tail end of the second knob rod and is used to drive the second knob rod to rotate along the thread in the lifting rod portion. The monitoring assembly is connected to the hollow knob assembly and is used to monitor the lifting force of the lifting rod portion on the screw when the second knob portion rotates along the thread in the lifting rod portion.

[0008] The screwdriver part is movably arranged through the fixed knob rod and the hollow knob assembly, the head end of the screwdriver part can move axially inside the fixed knob rod, and the tail end of the screwdriver part is located outside the hollow knob assembly.

[0009] In some embodiments, the lifting rod portion includes two metal arc-shaped blades that are arranged opposite to each other and hinged to each other, and the side seam is formed between the corresponding side edges of the two metal arc-shaped blades. A spring is arranged between the two metal arc-shaped blades to provide a pulling force towards each other between the head ends of the two metal arc-shaped blades, so that the head ends of the two metal arc-shaped blades are in a natural closed state when there is no external force. The inner sides of the head ends of the two metal arc-shaped blades are provided with a first protrusion that matches the groove on the tail cap of the screw, and the inner sides of the middle parts of the two metal arc-shaped blades are provided with a thread of a preset length for cooperating with the thread of the second knob rod.

[0010] In some embodiments, the front end of the first knob rod is two arc-shaped protrusions, the two arc-shaped protrusions are symmetrical about the central axis of the first knob rod, and the head ends of the two arc-shaped protrusions are arc-shaped.

[0011] In some embodiments, two cylindrical protrusions are symmetrically arranged on the side wall of the first knob rod about its central axis, and two sliding grooves are symmetrically opened on the inner wall of the lifting rod part, and the two cylindrical protrusions are respectively slidably arranged in the two sliding grooves.

[0012] In some embodiments, the hollow knob assembly includes a hollow torque sensor and an anti-slip handle, the tail end of the second knob rod is connected to the front end of the hollow torque sensor, the anti-slip handle is connected to the rear end of the hollow torque sensor, and the interior of the anti-slip handle is hollow.

[0013] In some embodiments, the monitoring component includes a display screen assembly and a power supply unit, the display screen assembly is connected to the hollow knob assembly, and the power supply unit is connected to the display screen assembly.

[0014] In some embodiments, the lifting force monitoring system also includes a shell, which includes a main shell and two end covers detachably connected to the front and rear sides of the main shell, and a through hole is opened on the end cover, and the monitoring component and the hollow knob component are integrated in the shell.

[0015] In some embodiments, the screwdriver portion includes a connecting rod with a nut screwdriver head and a handle fixed at the rear end of the connecting rod; the connecting rod is movably inserted into the fixed knob rod portion and the hollow knob assembly, a second protrusion is provided on the outer wall of the connecting rod, a baffle is provided on the inner wall of the second knob rod, and the baffle is always located behind the second protrusion, and the handle is located outside the hollow knob assembly.

[0016] In addition, the present invention also provides a method for using a real-time monitoring device for lifting force of lumbar spondylolisthesis, comprising the following steps:

[0017] 1) Using a nut, the screw connecting rod is locked in the first screw tail cap in the vertebral pedicle adjacent to the slipped vertebral body, and the screw connecting rod is tilted upward, and a lifting and resetting distance is reserved between the screw connecting rod and the second screw in the pedicle of the slipped vertebral body;

[0018] 2) a nut is arranged at the head end of the screwdriver part, the head end of the lifting rod part is clamped and matched with the tail cap of the second screw in the pedicle of the slipped vertebral body, and the screw connecting rod is radially inserted into the side seam of the lifting rod part;

[0019] 3) Insert the fixed knob rod together with the lifting force monitoring system and the screwdriver part from the rear end of the lifting rod part, and rotate the hollow knob assembly at a constant speed so that the second knob rod of the fixed knob rod rotates along the thread of the lifting rod part. When resistance appears when rotating the hollow knob assembly, the head end of the first knob rod abuts against the screw connecting rod; then continue to rotate the hollow knob assembly, and the first knob rod begins to press down the screw connecting rod. At this time, the screw connecting rod is locked in a fixed position, which is equivalent to lifting the lifting rod part, and the lifting rod part applies a lifting force to the second screw, and the monitoring assembly monitors the magnitude of the lifting force in real time;

[0020] 4) When the lifting force is too large and approaches the predicted lifting force threshold for pulling out the second screw, stop the lifting and resetting operation; remove the monitoring device, loosen the nut on the first screw, press down the screw connecting rod, adjust the reserved lifting and resetting distance between the screw connecting rod and the second screw, and then use the nut to re-tighten the screw connecting rod on the first screw, and then repeat steps 2) and 3);

[0021] 5) When the second knob rod can no longer rotate along the thread in the lifting rod part, the head end of the first knob rod completely presses the screw connecting rod into the second screw tail cap; then, the nut on the head end of the screwdriver part is screwed into the second screw tail cap and tightened. At this time, the position of the screw connecting rod and the second screw is fixed, and the lifting and resetting operation is completed.

[0022] The present invention adopts the above technical solution, which has the following advantages: the present invention drives the second knob rod to rotate along the thread in the lifting rod part through the hollow knob assembly, and the first knob rod abuts the screw connecting rod. The screw connecting rod is locked, which is equivalent to lifting the lifting rod part. The lifting rod part applies a lifting force to the screw to perform lifting and reduction of lumbar spondylolisthesis. The monitoring assembly monitors the lifting force of the lifting rod part on the screw when the second knob part rotates along the thread in the lifting rod part in real time, thereby realizing real-time monitoring of the lifting force of the screw during reduction of slippage, ensuring that the lifting force is below the threshold during the reduction process of slippage, and avoiding the screw from being pulled out as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0025] It should be noted that all directional indications in the present embodiment (such as proximal end, distal end, front end, rear end, head end, tail end, etc.) are only used to explain the relative position relationship, movement status, etc. of each component under the general operating posture, that is, the side close to the operator is called the proximal end, rear end or tail end, and the side away from the operator is called the distal end, front end or head end; if the operating posture changes, the directional indication will also change accordingly.

[0026] like Figure 1 As shown, a real-time monitoring device for lifting force of lumbar spondylolisthesis provided by the present invention comprises a lifting rod portion 1, a fixed knob rod portion 2, a lifting force monitoring system 3 and a screwdriver portion 4;

[0027] The interior of the lifting rod 1 is hollow, and its head end can be clamped and matched with the tail cap of the screw, and at least two sides near its head end are provided with side slits for the screw connecting rod to pass through;

[0028] The fixed knob rod 2 is inserted into the lifting rod 1 from the rear end thereof, and comprises a first knob rod 21 and a second knob rod 22 which are rotatably connected to each other. The first knob rod 21 and the second knob rod 22 are both hollow structures. The head end of the first knob rod 21 can form a stable abutment with the screw connecting rod, and the second knob rod 22 is threadedly engaged in the lifting rod 1.

[0029] The lifting force monitoring system 3 includes a hollow knob assembly and a monitoring assembly. The hollow knob assembly is connected to the tail end of the second knob rod 22 and is used to drive the second knob rod 22 to rotate along the thread in the lifting rod part 1. The monitoring assembly is connected to the hollow knob assembly and is used to monitor the lifting force of the lifting rod part 1 on the screw when the second knob part 22 rotates along the thread in the lifting rod part 1.

[0030] The screwdriver part 4 is movably arranged through the fixed knob rod 2 and the hollow knob assembly. The head end of the screwdriver part 4 can move axially inside the fixed knob rod 2, and the tail end of the screwdriver part 4 is located outside the hollow knob assembly.

[0031] In the above embodiment, preferably, the lifting rod portion 1 includes two metal arc-shaped blades 11 which are arranged opposite to each other and hinged to each other, and a side seam is formed between the corresponding side edges of the two metal arc-shaped blades. A spring is arranged between the two metal arc-shaped blades 11 to provide a pulling force between the head ends of the two metal arc-shaped blades 11, so that the head ends of the two metal arc-shaped blades 11 are in a naturally closed state when no external force is applied. The inner sides of the head ends of the two metal arc-shaped blades 11 are provided with protrusions that are compatible with the grooves on the tail cap of the screw; when in use, a pressure is applied from the rear ends of the two metal arc-shaped blades 11. Pressure is applied to overcome the pulling force of the spring, the head ends of the two metal arc-shaped blades 11 are opened, the tail cap of the screw is inserted between the head ends of the two metal arc-shaped blades 11, and the pressing force is removed. Under the rebound action of the spring, the two metal arc-shaped blades 11 are clamped on the outside of the screw tail cap, and the two protrusions on the two metal arc-shaped blades 11 are correspondingly embedded in the grooves of the screw tail cap, so that the lifting rod 1 clamps the screw tail cap and fixes it with it; a certain length of thread is set on the inner side of the middle part of the two metal arc-shaped blades 11, which is used to cooperate with the thread of the second knob rod 22, so as to facilitate the lifting of the screw.

[0032] In the above embodiment, preferably, the front end of the first knob rod 21 is two arc-shaped protrusions 211, and the two arc-shaped protrusions 211 are symmetrical about the central axis of the first knob rod 21, and the head ends of the two arc-shaped protrusions 211 are also arc-shaped, so that the two arc-shaped protrusions 211 are adapted to the outer wall of the screw connecting rod, thereby making the head end of the first knob rod 21 form a stable abutment with the screw connecting rod.

[0033] In the above embodiment, preferably, two cylindrical protrusions 212 are symmetrically arranged on the side wall of the first knob rod 21 about its central axis, and two sliding grooves (not shown in the figure) are symmetrically opened on the inner wall of the lifting rod portion 1, and the two cylindrical protrusions 212 are respectively slidably penetrated into the two sliding grooves to limit the axial movement of the fixed knob rod portion 2 in the lifting rod portion 1, so that when the fixed knob rod portion 2 moves axially inside the lifting rod portion 1, the directions of the two arc-shaped protrusions at the head end of the first knob rod 21 remain unchanged.

[0034] In the above embodiment, preferably, the hollow knob assembly includes a hollow torque sensor 32 and an anti-slip handle 33, the tail end of the second knob rod 22 is connected to the front end of the hollow torque sensor 32, the anti-slip handle 33 is connected to the rear end of the hollow torque sensor 32, and the interior of the anti-slip handle 33 is hollow.

[0035] In the above embodiment, preferably, the monitoring component includes a display screen assembly 34 and a power supply unit 35, the display screen assembly 34 is connected to the hollow torsion sensor 32, the power supply unit 35 is connected to the hollow torque sensor 32 and the display screen assembly 34, the hollow torque sensor 32 measures the torque when the second knob rod 22 rotates in real time, and transmits it to the display screen assembly 34, the display screen assembly 34 processes the transmitted torque information and displays the size of the processed lifting force.

[0036] In the above embodiment, preferably, the lifting force monitoring system 3 also includes a shell 31, the shell 31 includes a main shell 311 and two end covers 312 detachably connected to the front and rear sides of the main shell 311, and a through hole is opened on the end cover 312, and the monitoring component and the hollow knob component are integrated in the shell 31; when in specific use, the hollow torque sensor 32 is installed in the main shell 311, and the central axis of the hollow torque sensor 32 coincides with the central axis of the through hole on the end cover 312, the power supply unit 35 is also installed in the main shell 311, the display screen assembly 34 is arranged on the side of the main shell 311, the tail end of the second knob rod 22 passes through the through hole of the end cover 312 and is connected to the front end of the hollow torque sensor 32, and the anti-slip hand grip 33 passes through the through hole and is connected to the rear end of the hollow torque sensor 32.

[0037] In the above embodiment, preferably, the screwdriver portion 4 includes a connecting rod 41 with a nut screwdriver head and a handle 42 fixed at the rear end of the connecting rod 41; the connecting rod 41 is movably inserted into the fixed knob rod 2 and the hollow knob assembly, a protrusion is provided on the outer wall of the connecting rod 41, a baffle is provided on the inner wall of the second knob rod 22 of the fixed knob rod 2, and the baffle is always located behind the protrusion, and the handle 42 is located outside the hollow knob assembly; when the screwdriver portion 4 slides toward the rear end of the fixed knob rod 2, the protrusion abuts against the baffle on the inner wall of the second knob rod 22, limiting the screwdriver portion 4 from continuing to slide toward the rear end of the fixed knob rod 2, and when the screwdriver portion 4 slides toward the head end of the fixed knob rod 2, since the diameter of the handle 42 is larger than the diameter of the fixed knob rod 2 and the hollow part of the hollow knob assembly, the screwdriver portion 4 is limited from continuing to slide toward the head end of the fixed knob rod 2.

[0038] On the other hand, based on a real-time monitoring device for lifting and pulling force of lumbar spondylolisthesis in any of the above embodiments, the present invention further provides a method for using the real-time monitoring device for lifting and pulling force of lumbar spondylolisthesis, which comprises the following steps:

[0039] 1) Using a nut, the screw connecting rod is locked in the first screw tail cap in the vertebral pedicle adjacent to the slipped vertebral body, and the screw connecting rod is tilted upward, and a lifting and resetting distance is reserved between the screw connecting rod and the second screw in the pedicle of the slipped vertebral body;

[0040] 2) A nut is provided at the head end of the screwdriver part 4, and the head end of the lifting rod part 1 is clamped and matched with the second screw tail cap in the pedicle of the slipped vertebral body, and the screw connecting rod is radially inserted into the side seam of the lifting rod part 1;

[0041] 3) Insert the fixed knob rod 2 together with the lifting force monitoring system 3 and the screwdriver part 4 from the rear end of the lifting rod 1, and rotate the hollow knob assembly at a constant speed so that the second knob rod 22 of the fixed knob rod 2 rotates along the thread of the lifting rod 1. When resistance appears when rotating the hollow knob assembly, it means that the head end of the first knob rod 21 is in contact with the screw connecting rod; continue to rotate the hollow knob assembly, and the first knob rod 21 of the fixed knob rod 2 begins to press down the screw connecting rod. At this time, the screw connecting rod is locked in a fixed position, which is equivalent to lifting the lifting rod 1. The lifting rod 1 applies a lifting force to the second screw, and the monitoring assembly monitors the magnitude of the lifting force in real time;

[0042] 4) When the lifting force is too large and approaches the lifting force threshold predicted for the second screw to be pulled out, stop the lifting and resetting operation; remove the entire monitoring device, loosen the nut on the first screw, press down the screw connecting rod, and adjust the lifting and resetting distance reserved between the screw connecting rod and the second screw, thereby reducing the lifting force required for lifting and resetting to prevent the screw from being pulled out, and then use the nut to re-tighten the screw connecting rod on the first screw, and then repeat steps 2) and 3);

[0043] 5) When the second knob rod 22 can no longer rotate along the thread in the lifting rod part 1, the head end of the first knob rod 21 completely presses the screw connecting rod into the second screw tail cap; then, the nut on the head end of the screwdriver part 4 is screwed into the second screw tail cap and tightened. At this time, the position of the screw connecting rod and the second screw is fixed, and the lifting and resetting operation is completed.

[0044] The present invention is only described with the above embodiments, and the structure, location and connection of each component can be changed. Based on the technical solution of the present invention, any improvement or equivalent transformation of individual components based on the principle of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A real-time monitoring device for lumbar spondylolisthesis pulling force, characterized in that: include: The lifting rod part is hollow inside, and the head end can be clamped and matched with the tail cap of the screw, and at least two sides near the head end are provided with side slits for the screw connecting rod to pass through; A fixed knob rod is inserted into the lifting rod from its rear end, the fixed knob rod comprises a first knob rod and a second knob rod rotatably connected to each other, the first knob rod and the second knob rod are both hollow structures, the head end of the first knob rod can form a stable abutment with the screw connecting rod, and the second knob rod is threadedly engaged in the lifting rod; A lifting force monitoring system, comprising a hollow knob assembly and a monitoring assembly, wherein the hollow knob assembly is connected to the tail end of the second knob rod and is used to drive the second knob rod to rotate along the thread in the lifting rod portion, and the monitoring assembly is connected to the hollow knob assembly and is used to monitor the lifting force of the lifting rod portion on the screw when the second knob rod rotates along the thread in the lifting rod portion; A screwdriver part, movably passing through the fixed knob rod and the hollow knob assembly, wherein the head end of the screwdriver part can move axially inside the fixed knob rod, and the tail end of the screwdriver part is located outside the hollow knob assembly; The lifting rod portion includes two metal arc-shaped blades that are arranged oppositely and hinged to each other, the side seam is formed between the corresponding side edges of the two metal arc-shaped blades, a spring is arranged between the two metal arc-shaped blades, and is used to provide a pulling force between the head ends of the two metal arc-shaped blades, so that the head ends of the two metal arc-shaped blades are in a natural closed state when no external force is applied, the inner sides of the head ends of the two metal arc-shaped blades are both provided with a first protrusion that matches the groove on the tail cap of the screw, and the inner sides of the middle parts of the two metal arc-shaped blades are provided with a thread of a preset length, which is used to match the thread of the second knob rod; The screwdriver part includes a connecting rod with a nut screwdriver head and a handle fixed at the rear end of the connecting rod; the connecting rod is movably inserted into the fixed knob rod and the hollow knob assembly, a second protrusion is arranged on the outer wall of the connecting rod, a baffle is arranged on the inner wall of the second knob rod, and the baffle is always located behind the second protrusion, and the handle is located outside the hollow knob assembly.

2. A real-time monitoring device for lumbar spondylolisthesis pulling force according to claim 1, characterized in that: The front end of the first knob rod is two arc-shaped protrusions, the two arc-shaped protrusions are symmetrical about the central axis of the first knob rod, and the head ends of the two arc-shaped protrusions are arc-shaped.

3. A real-time monitoring device for lumbar spondylolisthesis pulling force according to claim 1, characterized in that: Two cylindrical protrusions are symmetrically arranged on the side wall of the first knob rod about its central axis, and two sliding grooves are symmetrically opened on the inner wall of the lifting rod part, and the two cylindrical protrusions are respectively slidably arranged in the two sliding grooves.

4. A real-time monitoring device for lumbar spondylolisthesis pulling force according to claim 1, characterized in that: The hollow knob assembly includes a hollow torque sensor and an anti-slip handle, the tail end of the second knob rod is connected to the front end of the hollow torque sensor, the anti-slip handle is connected to the rear end of the hollow torque sensor, and the interior of the anti-slip handle is hollow.

5. A real-time monitoring device for lumbar spondylolisthesis pulling force according to claim 1 or 4, characterized in that: The monitoring component includes a display screen assembly and a power supply unit. The display screen assembly is connected to the hollow knob assembly, and the power supply unit is connected to the display screen assembly.

6. The real-time monitoring device for lumbar spondylolisthesis pulling force according to claim 1, characterized in that: The lifting force monitoring system also includes a shell, which includes a main shell and two end covers detachably connected to the front and rear sides of the main shell, and through holes are provided on the end covers. The monitoring component and the hollow knob component are integrated in the shell.

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