Driving mechanism of trephine

Abstract

The utility model relates to the technical field of medical instruments, in particular to a trephine driving mechanism. Comprising a trephine quick connector used for installing a trephine and a driving motor in transmission connection with the trephine quick connector, the output end of the driving motor is connected to one end of an elastic shaft of a torque sensor through a deflection mechanism, the other end of the elastic shaft of the torque sensor is fixedly connected with the trephine quick connector, and the signal collecting end of the torque sensor is electrically connected with a control circuit. The control circuit controls the rotating speed of the driving motor according to signals of the torque sensor. The driving mechanism adopts motor driving to replace manual operation, the automation degree is high, the rotating speed of the driving motor can be controlled according to signals of the torque sensor, and the operation safety is high; one-way rotating cutting is replaced by swinging cutting, and the problem that the danger coefficient of cutting a whole circle is high in the using process of an existing trephine for the lumbar intervertebral disc operation is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a driving mechanism of a ring saw. Background Art

[0002] A ring saw is a surgical instrument used for circular sawing, and is often used in foraminal endoscopic lumbar spine decompression, lumbar disc herniation and other endoscopic lumbar disc surgery. For example, in the treatment of intervertebral disc herniation, in the case of disc herniation, in order to allow the working channel to safely reach the spinal cavity, a ring saw is needed to remove the hyperplastic bone at the distal end of the facet joint and part of the upper joint protrusion to expand the intervertebral foramen, so that the working channel of the spinal endoscope can reach the spinal cavity, and surgical instruments are used to remove the herniated nucleus pulposus tissue to achieve the purpose of treating intervertebral disc herniation. When using a ring saw during surgery, it can only be turned clockwise. Only a complete circle can achieve articular process shaping under the foraminal endoscope, and the cutting force and rotation speed are completely dependent on the clinician's feel and personal experience, and the surgical risk is relatively high. Now some clinicians have improved the operation method and achieved safe cutting of intervertebral disc herniation by repeated semicircles. For example, Chinese patent 2020203057017 discloses "Spinal Endoscopic Forward and Reverse Ring Saw", the publication number is CN211911714U, this forward and reverse ring saw includes a tubular tube body with annular serrations at the bottom, the upper part of the tube body is slidably connected to the limit baffle and the limit tube from bottom to top in sequence, the middle part of the limit tube is rotatably connected to a horizontally rotatable scale plate, the bottom of the scale plate is fixedly connected to an extension column at the bottom of the rear side, the bottom of the extension column is slidably connected to a sliding rod that can move up and down, the front end of the sliding rod is fixedly connected to an annular clamping ring, the inner side of the clamping ring is provided with a radially movable card, the clamping ring and the tube body are coaxial; the top of the tube body is detachably connected with a handle. This solves the problem of high risk factor of cutting a full circle and low efficiency of reciprocating semicircle cutting in the current lumbar disc surgery. However, the forward and reverse trepanation still needs to be operated manually and cannot achieve precise torque control. During surgery, the bone density that needs to be cut by the trepanation varies greatly for different surgical individuals and different surgical sites, and the cutting speed and torque corresponding to different bone densities also vary to a certain extent. Therefore, the current trepanation technology and the forward and reverse trepanation mentioned above still need to be further improved in reducing surgical risks. Utility Model Content

[0003] In view of the above technical problems, the purpose of the utility model is to provide a driving mechanism of a ring saw which has a high degree of automation, strong surgical safety and can realize swing cutting.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The driving mechanism of a ring saw described in the utility model includes a ring saw quick connector for installing the ring saw, and a driving motor transmission-connected to the ring saw quick connector, the output end of the driving motor is connected to the torque input end of the torque sensor through a yaw mechanism, the torque output end of the torque sensor is fixedly connected to the ring saw quick connector, the signal acquisition end of the torque sensor is electrically connected to the control circuit, and the control circuit controls the rotation speed of the driving motor according to the signal of the torque sensor.

[0006] Through this solution, motor drive is used instead of manual operation, the degree of automation is high and the speed of the drive motor can be controlled according to the signal of the torque sensor, so the operation is safe. Swinging cutting is used instead of unidirectional rotation cutting, which solves the problem of high risk factor of cutting a whole circle when using the ring saw in lumbar disc surgery.

[0007] Preferably, the yaw mechanism includes an eccentric wheel mounted on the rotating shaft of the driving motor and a rocker rod fixedly connected to the torque input end of the torque sensor, the rocker rod is provided with a long hole matching the eccentric wheel, and the eccentric wheel is mounted in the long hole through a bearing.

[0008] Through this solution, the unidirectional rotation of the driving motor is converted into the swing of the torque sensor.

[0009] Preferably, a speed reduction mechanism is provided between the driving motor and the yaw mechanism.

[0010] Through this solution, the rotation speed can be reduced and the torque can be increased.

[0011] Preferably, the torque input end and the torque output end of the torque sensor are respectively installed in the upper shaft seat and the lower shaft seat through bearings, and the upper shaft seat and the lower shaft seat are both fixedly installed on the slide plate.

[0012] Through this solution, it is easy to realize the axial movement of the torque sensor and the ring saw under electric control.

[0013] Preferably, the reduction mechanism is a planetary gear reduction mechanism.

[0014] Through this solution, the reduction ratio of the reduction mechanism is large, the operation is stable and the structure is compact.

[0015] Compared with the prior art, the beneficial effects of the utility model are: the driving mechanism of the ring saw adopts motor drive instead of manual operation, has a high degree of automation and can control the rotation speed of the driving motor according to the signal of the torque sensor, and has strong surgical safety; it uses swing cutting instead of unidirectional rotation cutting, which solves the problem of high risk factor of cutting a whole circle when using the ring saw in lumbar disc surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0017] Figure 2 It is a principle block diagram of the control circuit of the utility model.

[0018] Figure 3 It is a structural diagram of the eccentric wheel. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the utility model.

[0020] like Figure 1 As shown, the driving mechanism of the ring saw described in the utility model includes a ring saw quick connector 1 for installing the ring saw 9, and a driving motor 2 connected to the ring saw quick connector 1. The ring saw adopts a common tubular structure, and a surgical ring saw with saw teeth on the end annular end surface. Of course, other tubular or rod-shaped ring saws can also be used. When in use, the ring saw 9 is installed on the ring saw quick connector 1, and the driving motor 2 drives the ring saw 9 to move through the ring saw quick connector 1.

[0021] The driving motor 2 adopts a small or micro servo motor with adjustable speed, and the speed of the driving motor 2 is adjusted and controlled by the control circuit PCB. The circuit structure and working principle of the control circuit PCB are both existing technologies and will not be further introduced here.

[0022] The output end of the driving motor 2 is connected to the torque input end of the torque sensor 3 through the yaw mechanism. The torque output end of the torque sensor 3 is fixedly connected to the ring saw quick connector 1. The signal collection end of the torque sensor 3 is electrically connected to the control circuit PCB. Figure 2 As shown, the control circuit PCB controls the rotation speed of the drive motor 2 according to the signal of the torque sensor 3. The torque sensor is also called a torque sensor or a torque sensor, which is commonly used to sense and detect torsional torque on rotating or non-rotating mechanical parts, and convert the physical change of torque into an accurate electrical signal. The commonly used torque sensor has a coaxially arranged torque input end and a torque output end, where the torque input end and the torque output end may be a hollow tube, or a solid rod or shaft, which can also be called the elastic shaft of the torque sensor 3. In this embodiment, the control circuit PCB accurately adjusts the rotation speed of the drive motor 2 according to the changes in the electrical signal received from the torque sensor, so as to adapt to the changes in bone density of different individuals and different surgical sites during surgery.

[0023] like Figure 1As shown, the yaw mechanism includes an eccentric wheel 4 mounted on the rotating shaft of the driving motor 2, and a swing rod 5 fixedly connected to the torque input end of the torque sensor 3. The swing rod 5 is a long strip plate-like structure, and the torque input end of the torque sensor 3 is located at one end of the long strip plate-like structure. The swing rod 5 is provided with a long hole 6 matching the eccentric wheel 4, and the eccentric wheel 4 is installed in the long hole 6 through a bearing. The eccentric wheel 4 is provided with an axial hole 41 for installing the rotating shaft of the driving motor 2 and a shaft rod 42 for installing the bearing. The axial hole 41 and the shaft rod 42 are eccentrically arranged, that is, the axes of the two are parallel to each other but not concentric. The rotating shaft of the driving motor 2 is fixedly installed in the axial hole 41, and the eccentric shaft rod 42 is installed with a bearing. When the driving motor 2 is working, the bearing on the shaft rod makes a circular motion around the rotating shaft of the driving motor 2, and at the same time reciprocates in the long hole 6 of the swing rod 5, pushing the end of the swing rod 5 to swing back and forth. The bearing on the shaft rod can prevent the shaft rod from directly contacting the hole wall of the long hole 6, reduce friction, and extend the service life.

[0024] As a further improvement of the utility model, a reduction mechanism 7 is provided between the drive motor 2 and the yaw mechanism. The reduction mechanism 7 can reduce the speed output to the yaw mechanism and increase the torque. In this embodiment, the reduction mechanism 7 is a planetary gear reduction mechanism. Compared with other forms of reduction mechanisms, the planetary gear reduction mechanism has the characteristics of large reduction ratio, small size, compact structure and smooth operation.

[0025] In addition, if Figure 1 As shown, the torque input end and the torque output end of the torque sensor 3 are respectively installed in the upper shaft seat 31 and the lower shaft seat 32 through bearings, and the upper shaft seat 31 and the lower shaft seat 32 are both fixedly installed on the slide 8. The drive motor 2 is also installed on the slide 8 and is located on one side of the torque sensor 3, so that the rotating shaft of the drive motor 2 is parallel to the elastic axis of the torque sensor 3. The upper shaft seat 31 and the lower shaft seat 32 are located on the same axis, so that the elastic axis of the sensor 3 and the ring saw are highly concentric. After being installed on the slide 8, the slide 8 is installed on the slide rail, and the slide 8 can be driven to move by a mechanical device, so as to realize the axial feeding of the ring saw and further improve the degree of automation. There can be a variety of existing technologies for the mechanical device used to drive the slide 8 to move, which will not be repeated here.

[0026] When in use, the driving motor 2 drives the eccentric wheel 4 to rotate. The shaft on the eccentric wheel 4 makes a circular motion while moving back and forth in the long hole 6 of the rocker arm 5, pushing the rocker arm 5 to swing. The swing of the rocker arm 5 is transmitted to the torque sensor 3, causing the torque sensor 3 to swing back and forth. The torque sensor 3 drives the ring saw to swing back and forth. The resistance encountered by the ring saw when cutting the bone is transmitted to the torque sensor 3 to generate a corresponding torque signal. This torque signal is fed back to the control circuit PCB, and the control circuit PCB generates a driving signal for controlling the speed of the driving motor 2, thereby adjusting the speed of the driving motor 2.

[0027] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0028] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A driving mechanism for a ring saw, comprising a ring saw quick connector (1) for mounting the ring saw, and a driving motor (2) drivingly connected to the ring saw quick connector (1), characterized in that: The output end of the drive motor (2) is connected to the torque input end of the torque sensor (3) through a yaw mechanism; the torque output end of the torque sensor (3) is fixedly connected to the ring saw quick connector (1); the signal collection end of the torque sensor (3) is electrically connected to a control circuit (PCB); and the control circuit (PCB) controls the rotation speed of the drive motor (2) according to the signal of the torque sensor (3).

2. The driving mechanism of the ring saw according to claim 1, characterized in that: The yaw mechanism comprises an eccentric wheel (4) mounted on the rotating shaft of a driving motor (2), and a swing rod (5) fixedly connected to the torque input end of a torque sensor (3); the swing rod (5) is provided with a long hole (6) matching the eccentric wheel (4); and the eccentric wheel (4) is mounted in the long hole (6) via a bearing.

3. A driving mechanism of a ring saw according to claim 1 or 2, characterized in that: A speed reduction mechanism (7) is provided between the driving motor (2) and the yaw mechanism.

4. A driving mechanism of a ring saw according to claim 1 or 2, characterized in that: The torque input end and the torque output end of the torque sensor (3) are respectively mounted in an upper shaft seat (31) and a lower shaft seat (32) through bearings, and the upper shaft seat (31) and the lower shaft seat (32) are both fixedly mounted on a slide plate (8).

5. The driving mechanism of the ring saw according to claim 3, characterized in that: The speed reduction mechanism (7) is a planetary gear speed reduction mechanism.

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