Lamina retractor device

Abstract

The present invention provides a lamina retractor device. The lamina retractor device includes: a retracting mechanism, including a holding structure and a retracting structure connected to the holding structure, the retracting structure including a first support arm and a second support arm connected to the first support arm, a first jaw movably arranged on the first support arm, a second jaw arranged on the second support arm, the first jaw having a retracting position away from the second jaw and a receiving position close to the second jaw; a conveying mechanism arranged on the holding structure, the conveying mechanism including a connecting structure for connecting or releasing an implant to be implanted, the conveying mechanism being movably arranged relative to the holding structure so that the implant to be implanted can move to the first jaw and / or the second jaw. In the technical solution of the present invention, the lamina retractor device can accurately implant the implant to be implanted onto the lamina while retracting the lamina within a limited field of view and operable range, facilitating the operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more particularly to a lamina retractor device. Background Art

[0002] The human spine includes a spinal canal structure, and the spinal canal may be stenosed due to various reasons, such as developmental spinal stenosis, cervical spondylosis, intervertebral disc herniation, ossification of the posterior longitudinal ligament, and hypertrophy of the ligamentum flavum. If spinal canal stenosis occurs, it will cause compression of the spinal cord, resulting in axial pain, limb pain and numbness, muscle weakness or even paralysis, seriously affecting people's daily life.

[0003] Open-door laminoplasty (such as double-open-door laminoplasty or semi-open-door laminoplasty) is a commonly used surgical method for expanding the spinal canal. In spinal laminoplasty, the usual surgical methods include "single-open-door" or "double-open-door". In the existing single-open-door surgery, the lamina retraction step is usually performed by the method of unilateral incision and suture. Simple tools such as forceps and hooks are used to lift the lamina. In single-open-door surgery, because the muscles and ligaments attached to the spinous process are relatively thoroughly dissected, there is a large operative space during the operation, and precise retraction is not required. Therefore, simple tools such as forceps and hooks are sufficient to meet the retraction and maintenance of the lamina in this type of surgery. However, sometimes bilateral incision and suture of the lamina are required, the gap is retracted to lift the spinous process, and artificial bone or replacement filling blocks are added into the gap and fixed in cooperation with bone plates, which is commonly known as "lifting the top operation". In this operation, the retraction of the spinous process cannot be perpendicular to the incision surface, but requires the spinous process to be retracted backward perpendicular to the human coronal plane. And this operation is different from the traditional laminoplasty. It does not require the dissection of the muscles and ligaments attached to the spinous process, and only needs to implant artificial lamina prostheses through two small incisions on both sides. However, the operative field and the operable range during this operation are very limited, and the muscles and ligaments attached to the spinous process often have a certain resistance to the retraction of the lamina during the retraction process. Therefore, in the retraction tools used in the above single-open-door surgery, in the "lifting the top operation", due to the limited field of view, it is very difficult for such simple tools to retract the lamina in the direction perpendicular to the human coronal plane backward. And due to the resistance of the muscles and ligaments attached to the spinous process, it is also very difficult to achieve firm retraction and maintenance of the lamina after retraction, and it is even more difficult to accurately implant artificial lamina prostheses during retraction.

[0004] Currently, in the "lifting the top operation", the retraction mechanism for retracting the lamina and the delivery mechanism for delivering the implant to be implanted are two separate and independent mechanisms. Implanting the implant to be implanted into the lamina needs to be performed when the lamina is in a retracted state. However, due to the very limited operative field and operable range during this operation, it is difficult to retract the lamina and accurately implant the implant to be implanted into the lamina within the limited field of view and operable range, resulting in inconvenient surgery. Summary of the Invention

[0005] The main object of the present invention is to provide a lamina retractor device, which can accurately implant an implant to the lamina while retracting the lamina within a limited field of view and an operable range, facilitating the operation.

[0006] To achieve the above object, the present invention provides a lamina retractor device, including: a retracting mechanism, including a holding structure and a retracting structure connected to the holding structure, the retracting structure including a first support arm and a second support arm connected to the first support arm, the first support arm being provided with a first jaw movably disposed thereon, the second support arm being provided with a second jaw, the first jaw having a retracted position away from the second jaw and a received position close to the second jaw; a conveying mechanism, disposed on the holding structure, the conveying mechanism including a connecting structure for connecting or releasing an implant, the conveying mechanism being movably disposed relative to the holding structure so that the implant can move to the first jaw and / or the second jaw.

[0007] Further, the retracting structure further includes a connecting rod, one end of the connecting rod is pivotally connected to the first jaw, the other end of the connecting rod is pivotally connected to the second jaw, the first jaw is pivotally connected to the first support arm, the second jaw is connected to the second support arm, and under the action of an external force, the first support arm is movably disposed relative to the second support arm so that the first jaw switches between the retracted position and the received position.

[0008] Further, the retracting structure further includes a receiving groove for receiving at least a part of the connecting rod, the receiving groove being disposed on the first support arm or the second support arm.

[0009] Further, the retracting mechanism further includes a first limiting structure for adjusting the position of the first support arm relative to the second support arm, the first limiting structure including: a first limiting hole, disposed on the first support arm; a second limiting hole, being a long hole disposed on the second support arm; a locking member, respectively connected to the first limiting hole and the second limiting hole to lock the first support arm to the second support arm.

[0010] Further, the retracting mechanism includes two retracting structures spaced apart from each other, the two first support arms of the two retracting structures are connected, and at least a part of the connecting structure is located in the gap between the two retracting structures.

[0011] Further, the holding structure includes: a first sleeve, connected to the second support arm, the conveying mechanism being located outside the first sleeve; a first rotating shaft, disposed in the first sleeve, the first rotating shaft being rotatably disposed about its own axis; wherein, one end of the first rotating shaft is in threaded cooperation with a support seat disposed on the first support arm, the first sleeve is provided with a second limiting structure for preventing the support seat from rotating, and at least a part of the support seat cooperates with the second limiting structure to convert the helical motion into a linear motion of the first support arm.

[0012] Further, the second limiting structure is a first limiting groove provided on the first sleeve, at least part of the support is located in the first limiting groove, and the support is movably arranged relative to the first limiting groove under the action of an external force; alternatively, the holding structure further includes a first knob, and the first knob is arranged at one end of the first rotating shaft away from the first support arm.

[0013] Further, the conveying mechanism further includes a second sleeve located outside the holding structure, the second sleeve is movably arranged relative to the holding structure, and the connecting structure is arranged in the second sleeve. The connecting structure includes a connecting shaft rotatably arranged around its own axis, and one end of the connecting shaft extends out of the second sleeve.

[0014] Further, the second sleeve includes a first sleeve section connected to the holding structure and a second sleeve section connected to the first sleeve section. There is an included angle between the central axis of the first sleeve section and the central axis of the second sleeve section, and the connecting shaft is arranged in the second sleeve section; the conveying mechanism further includes a second rotating shaft arranged in the first sleeve section, the second rotating shaft is rotatably arranged relative to the first sleeve section, and one end of the second rotating shaft is movably connected to the connecting shaft to drive the connecting shaft to rotate.

[0015] Further, the conveying mechanism further includes a second knob connected to the second rotating shaft, and the connecting shaft and the second knob are respectively arranged at opposite ends of the second rotating shaft; alternatively, the conveying mechanism further includes a second limiting member, a third limiting hole is provided on the first sleeve section, a second limiting groove is provided on the outer wall surface of the second rotating shaft, the second limiting member is inserted into the third limiting hole, and one end of the second limiting member passes through the third limiting hole and cooperates with the second limiting groove; alternatively, the conveying mechanism further includes a mounting seat connected to the second sleeve section, the mounting seat is arranged at one end of the second sleeve section away from the first sleeve section, and a mounting through hole is provided on the mounting seat.

[0016] Further, the lamina spreader further includes a moving mechanism, the conveying mechanism is connected to the holding structure through the moving mechanism, and the moving mechanism is movably arranged relative to the holding structure to drive the conveying mechanism to move.

[0017] Further, the moving mechanism includes: a moving structure, including a moving body and a first groove provided on the moving body and cooperating with at least part of the holding structure, and the conveying mechanism is connected to the moving body; a locking structure, inserted through the moving body, and the locking structure is movably arranged relative to the moving body, so that one end of the locking structure abuts against the outer wall surface of the holding structure to lock the moving structure and the holding structure.

[0018] Further, the moving structure further includes a second groove provided on the moving body, the second groove and the first groove are respectively located on opposite sides of the moving body, and the conveying mechanism is snap-connected to the second groove.

[0019] Applying the technical solution of the present invention, the spreading mechanism and the conveying mechanism are connected to form an integral structure. The spreading mechanism is used to spread the lamina, and the conveying mechanism is used to connect and convey the implant to be implanted, so that the implant to be implanted moves to the first jaw and the second jaw, that is, the implant to be implanted moves to the spread lamina. Under the action of an external force, the conveying mechanism releases the implant to be implanted, thereby realizing the accurate implantation of the implant to be implanted. That is to say, the spreading mechanism and the conveying mechanism are regarded as a whole. When the lamina is spread by the spreading mechanism, the implant to be implanted can be connected and conveyed to the spread lamina by the conveying mechanism, and then under the action of an external force, the conveying mechanism releases the implant to be implanted, and the implant to be implanted is accurately implanted at the spread lamina, thereby realizing the purpose of accurately implanting the implant to be implanted at the lamina while spreading the lamina; since the purpose of conveying the implant to be implanted to the spread lamina can be realized by the movement of the conveying mechanism relative to the holding structure, therefore, the lamina spreading device of the present application has lower requirements for the visual field and the operable range; in summary, the lamina spreading device of the present application can accurately implant the implant to be implanted at the lamina while spreading the lamina within the limited visual field and operable range, which is convenient for the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The schematic diagrams in the specification forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0021] Figure 1 shows a schematic structural diagram of an embodiment of the lamina spreading device according to the present invention;

[0022] Figure 2 shows Figure 1 a schematic structural diagram of the lamina spreading device from another angle;

[0023] Figure 3 shows Figure 2 a partial cross-sectional view;

[0024] Figure 4 shows Figure 1 a top view;

[0025] Figure 5 shows Figure 1 a schematic structural diagram of the spreading mechanism of the lamina spreading device;

[0026] Figure 6 shows Figure 5 a cross-sectional view of the spreading structure of the spreading mechanism (wherein, the first jaw is in the spreading position);

[0027] Figure 7 shows Figure 5Another cross-sectional view of the expansion structure of the expansion mechanism (wherein, the first jaw is in the retracted position);

[0028] Figure 8 shows Figure 5 Partial structural schematic diagram of the expansion mechanism of

[0029] Figure 9 shows Figure 8 Structural schematic diagram of the first support arm of

[0030] Figure 10 shows Figure 5 Another partial structural schematic diagram of the expansion mechanism of

[0031] Figure 11 shows Figure 1 Structural schematic diagram of the connection between the conveying mechanism and the moving mechanism of the lamina spreader of

[0032] Figure 12 shows Figure 11 Partial structural schematic diagram of the conveying mechanism of

[0033] Figure 13 shows Figure 11 Another partial structural schematic diagram of the conveying mechanism of

[0034] Figure 14 shows Figure 11 Structural schematic diagram of the connection between the conveying mechanism and the implant to be implanted of

[0035] Figure 15 shows Figure 14 Structural schematic diagram of the connection between the conveying mechanism and the implant to be implanted from another angle of

[0036] Figure 16 shows Figure 11 Structural schematic diagram of the moving mechanism of

[0037] Figure 17 shows the Figure 1 Structural schematic diagram of applying the lamina spreader of to the lamina (wherein, the first jaw is in the retracted position);

[0038] Figure 18 shows Figure 17 Another structural schematic diagram of (wherein, the first jaw is in the expanded position);

[0039] Figure 19 shows Figure 17 Another structural schematic diagram of (wherein, the first jaw is in the expanded position and the implant to be implanted moves to the first jaw); and

[0040] Figure 20The structural schematic diagram of the implant to be installed on the lamina is shown.

[0041] Among them, the above-mentioned drawings include the following reference numerals:

[0042] 10. Spreading mechanism; 11. Holding structure; 111. First sleeve; 112. First rotating shaft; 113. Second limiting structure; 114. First limiting groove; 115. First knob; 12. Spreading structure; 13. First support arm; 131. Support; 14. Second support arm; 15. First clamp head; 16. Second clamp head; 17. Connecting rod; 18. Accommodating groove; 191. First limiting hole; 192. Second limiting hole; 193. Locking part; 20. Delivery mechanism; 21. Connecting structure; 22. Second sleeve; 23. First sleeve section; 231. Third limiting hole; 24. Second sleeve section; 25. Second rotating shaft; 251. Second limiting groove; 26. Second knob; 27. Second limiting part; 28. Mounting seat; 281. Mounting through hole; 30. Implant to be implanted; 40. Moving mechanism; 41. Moving structure; 411. Moving body; 412. First groove; 413. Second groove; 42. Locking structure; 51. Lamina part; 52. Vertebral body part. Detailed implementation manners

[0043] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0044] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0045] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer relative to the contours of the respective components, but the above orientation terms do not limit the present invention.

[0046] Regarding the current spreading mechanism and delivery mechanism which are separately arranged and independent of each other, due to the extremely limited intraoperative vision and the operable range during the "lifting and topping" surgery, it is difficult to spread the lamina and accurately implant the implant to be implanted onto the lamina within the limited vision and operable range, resulting in the problem of inconvenient surgery. The present invention and the embodiments of the present invention provide a lamina spreading device.

[0047] It should be noted that in the present invention and the embodiments of the present invention, the implant to be implanted 30 is an artificial lamina prosthesis.

[0048] As Figures 1 to 3 , Figure 5 , Figure 6 and Figure 11 shown, in an embodiment of the present invention, the lamina spreader device includes a spreading mechanism 10 and a conveying mechanism 20. The spreading mechanism 10 includes a holding structure 11 and a spreading structure 12 connected to the holding structure 11. The spreading structure 12 includes a first support arm 13 and a second support arm 14 connected to the first support arm 13. A first jaw 15 is movably provided on the first support arm 13, and a second jaw 16 is provided on the second support arm 14. The first jaw 15 has a spreading position away from the second jaw 16 and a receiving position close to the second jaw 16. The conveying mechanism 20 is disposed on the holding structure 11. The conveying mechanism 20 includes a connecting structure 21 for connecting or releasing an implant 30 to be implanted. The conveying mechanism 20 is movably disposed relative to the holding structure 11 so that the implant 30 to be implanted can move to the position of the first jaw 15 and / or the second jaw 16.

[0049] In the above setting, the spreading mechanism 10 and the conveying mechanism 20 are connected to form an integral structure. The spreading mechanism 10 is used to spread the lamina, and the conveying mechanism 20 is used to connect and convey the implant 30 to be implanted, so that the implant 30 to be implanted moves to the positions of the first jaw 15 and the second jaw 16, that is, the implant 30 to be implanted moves to the position where the lamina is spread. Under the action of an external force, the conveying mechanism 20 releases the implant 30 to be implanted, thereby realizing the accurate implantation of the implant 30 to be implanted.

[0050] That is to say, the spreading mechanism 10 and the conveying mechanism 20 are regarded as a whole. When the lamina is spread by the spreading mechanism 10, the implant 30 to be implanted can be connected and conveyed to the position where the lamina is spread through the conveying mechanism 20, and then under the action of an external force, the conveying mechanism 20 releases the implant 30 to be implanted, and the implant 30 to be implanted is accurately implanted to the position where the lamina is spread, thereby realizing the purpose of accurately implanting the implant 30 to be implanted to the lamina while spreading the lamina. Since the purpose of conveying the implant 30 to be implanted to the position where the lamina is spread can be achieved by moving the conveying mechanism 20 relative to the holding structure 11, therefore, the requirement of the lamina spreader device of the present application for the visual field and the operable range is relatively low. In summary, the lamina spreader device of the present application can achieve the purpose of accurately implanting the implant to be implanted to the lamina while spreading the lamina within a limited visual field and operable range, which is convenient for the operation.

[0051] As Figures 1 to 3 , Figure 5 , Figure 6 , Figure 18 and Figure 20As shown, in the present invention and its embodiments, in order to facilitate the fixation and expansion of the lamina (the lamina includes a lamina part 51 and a vertebral body part 52), the first jaw 15 is a movable member, and the first jaw 15 is movably connected to the first support arm 13; the second jaw 16 is a fixed member, and the second jaw 16 is fixedly connected to the second support arm 14; that is, the first jaw 15 has an expanded position capable of expanding the lamina part 51 (at this time, the lamina part 51 is away from the vertebral body part 52) and a storage position that fits with the second jaw 16. In actual use, the second jaw 16 abuts against the vertebral body part 52, and the first jaw 15 abuts against the lamina part 51. Under the action of an external force, the first jaw 15 expands relative to the second jaw 16, and the first jaw 15 is in the expanded position, expanding the lamina part 51 to the side away from the vertebral body part 52, achieving the purpose of fixing and expanding the vertebral body.

[0052] In addition, the expansion structure 12 can be controlled by operating the gripping structure 11, so that the first jaw 15 and the second jaw 16 approach or move away from each other, thereby realizing the switching of the first jaw 15 between the expanded position and the storage position; when the first jaw 15 is in the expanded position, the expansion structure 12 is in the expanded state, that is, the expansion mechanism 10 expands the lamina. When the first jaw 15 is in the storage position, the expansion structure 12 is in the storage state, that is, the expansion mechanism 10 does not play an expansion role on the lamina. The gripping structure 11 is connected to the first jaw 15 through the first support arm 13, and the gripping structure 11 is connected to the second jaw 16 through the second support arm 14, thereby realizing the control of the expansion structure 12 by the gripping structure 11, enabling the expansion structure 12 to switch between the expanded state and the storage state, and realizing the expansion effect of the expansion mechanism 10 on the lamina. The connection structure 21 of the conveying mechanism 20 is used to connect or release the implant 30 to be implanted, thereby realizing the functions of the conveying mechanism 20 to connect, convey, and release the implant 30 to be implanted; during the operation, first connect the connection structure 21 with the implant 30 to be implanted. After the expansion mechanism 10 expands the lamina, apply an external force to make the conveying mechanism 20 convey the implant 30 to the expanded lamina, and further under the action of an external force, make the conveying mechanism 20 release the implant 30 to be implanted, thereby achieving the purpose of accurately implanting the implant 30 to be implanted into the lamina while expanding the lamina within a limited field of view and operable range, facilitating the operation.

[0053] In the technical solution of the present application, the lamina expansion device can expand the gap and vertically displace the spinous process backward under a limited field of view and operating range, achieving the purpose of expanding the intervertebral foramen, and can effectively maintain the expanded position of the spinous process part, enabling the artificial lamina prosthesis to be accurately implanted into the gap simultaneously.

[0054] In a lamina retractor device for "lifting the top technique" known to the inventor, the lamina retractor device relies on the front part of the retracting claw and the supporting claw to be close together for jointly extending into the side incision of the lamina. By tightly gripping the handle, the upper claw of the retracting claw can be retracted to achieve the function of lifting and retracting the incision. This tool can achieve effective and stable retraction of the lamina during the "lifting the top technique".

[0055] Although this tool can achieve firm retraction of the lamina, it often can only achieve retraction of the lamina. After using this tool, additional tools are often required to effectively support the retracted lamina and a clamping tool to hold and implant the artificial lamina prosthesis. That is to say, this lamina retractor device cannot achieve the function of implanting the artificial lamina prosthesis while retracting. When using this tool for implanting the artificial lamina prosthesis, multiple medical staff often need to cooperate to use multiple tools to implant the prosthesis, and it is often difficult to accurately implant the prosthesis into the expected position. The postoperative lamina retraction effect is often not ideal. Compared with the above technology, the lamina retractor device of the present application can achieve precise and simple implantation of the artificial lamina prosthesis (i.e., the implant 30 to be implanted). Moreover, the lamina retractor device of the present application includes a retracting mechanism 10 and a conveying mechanism 20 at the same time. When using the lamina retractor device of the present application, one hand operates the retracting mechanism 10 to achieve the retracting function, and the other hand operates the conveying mechanism 20 to convey the implant 30 to the first jaw 15 and the second jaw 16 through the conveying mechanism 20 and release the implant 30. The lamina retractor device of the present application can accurately implant the implant 30 while achieving retraction and maintaining the retracted state, ensuring the surgical efficiency and effect. Moreover, through the lamina retractor device of the present application, a single person can complete the retracting action and the implanting action without the cooperation of multiple people, which can save medical resources, improve utilization rate, simplify the surgical process, and facilitate the progress of the surgery.

[0056] As a relatively novel vertebral lamina plasty in recent years, the "lifting the top technique" can effectively protect the human muscles and ligaments during the operation, and can effectively prevent the occurrence of the phenomenon of the "re-closing" of the opened lamina and maintain the physiological shape of the human cervical vertebra after the operation. Therefore, this surgical method has a broad market development prospect. However, if the existing tools on the market are used for operation, they often have disadvantages such as not being simple enough and having a cumbersome operation, and it is very difficult to accurately implant the artificial lamina prosthesis in this surgical method (i.e., the surgical method). As a result, it is impossible to accurately restore the anatomical shape and the stability of the mechanical model after the operation. These disadvantages make the learning curve of this surgical method relatively long and the learning difficulty relatively large, which greatly limits the popularization of this surgical method. In the technical solution of the present application, the lamina retractor device can simplify this operation and can achieve precise implantation of the artificial lamina prosthesis. While ensuring the surgical effect, it greatly reduces the learning time and sweeps away an obstacle for the popularization of this surgical method.

[0057] Such as Figures 1 to 3 andFigures 5 to 7 As shown, in an embodiment of the present invention, the expansion structure 12 also includes a connecting rod 17, one end of the connecting rod 17 is pivotally connected to the first clamp 15, and the other end of the connecting rod 17 is pivotally connected to the second clamp 16. The first clamp 15 is pivotally connected to the first support arm 13, and the second clamp 16 is fixedly connected to the second support arm 14. Under the action of external force, the first support arm 13 is movably arranged relative to the second support arm 14 to enable the first clamp 15 to switch between the expanded position and the storage position.

[0058] In the above arrangement, the relative position of the second clamp head 16 and the second support arm 14 is fixed, and the first clamp head 15 and the second clamp head 16 are both pivotally connected to the connecting rod 17. When the first support arm 13 moves relative to the second support arm 14, the first clamp head 15 moves driven by the first support arm 13, and the connecting rod 17 rotates around the pivot point between the connecting rod 17 and the second clamp head 16 (the pivot point is a fixed point whose position does not change) driven by the first clamp head 15, and the connecting rod 17 is opened or stored between the first clamp head 15 and the second clamp head 16. Since the position of the second clamp head 16 is fixed, the first clamp head 15 is opened or stored relative to the second clamp head 16 driven by the connecting rod 17; that is, by moving the first support arm 13 relative to the second support arm 14, the first clamp head 15 can be switched between the opened position and the stored position relative to the second clamp head 16.

[0059] Of course, in alternative embodiments not shown in the drawings of the present application, the second clamp 16 can also be pivotally connected to the second support arm 14 according to actual needs. In this way, when the first support arm 13 and the second support arm 14 move relative to each other, the first clamp 15 and the second clamp 16 can be switched between the open position and the storage position, thereby increasing the opening effect of the opening mechanism 10.

[0060] like Figure 6 and Figure 7 As shown, in the embodiment of the present invention, the support structure 12 further includes a receiving groove 18 for receiving at least part of the connecting rod 17, and the receiving groove 18 is provided on the second support arm 14. When the support structure 12 is in the storage state, at least part of the connecting rod 17 is stored in the receiving groove 18. The provision of the receiving groove 18 can realize the storage of the connecting rod 17 on the one hand, and can reduce the distance between the first clamp head 15 and the second clamp head 16 on the other hand, so that the structure is compact. Since in the embodiment of the present invention, compared with the first support arm 13, the second support arm 14 has higher stability, the connecting rod 17 can be stored in the receiving groove 18 conveniently, easily, stably, reliably and accurately.

[0061] Of course, in an alternative embodiment not shown in the drawings of the present application, the receiving groove 18 can also be provided on the first supporting arm 13 according to actual needs.

[0062] As Figures 1 to 3 , Figure 5 , Figure 9 and Figure 10 shown, in the embodiments of the present invention, the spreading mechanism 10 further includes a first limiting structure for adjusting the position of the first support arm 13 relative to the second support arm 14. The first limiting structure includes a first limiting hole 191, a second limiting hole 192, and a locking member 193. The first limiting hole 191 is provided on the first support arm 13; the second limiting hole 192 is a long hole provided on the second support arm 14; the locking member 193 is connected to the first limiting hole 191 and the second limiting hole 192 respectively to lock the first support arm 13 to the second support arm 14.

[0063] In the above setting, the first support arm 13 is movable relative to the second support arm 14. By moving the first support arm 13 relative to the second support arm 14, the position of the first jaw 15 relative to the second jaw 16 can be adjusted; according to actual needs, after moving the first support arm 13 relative to the second support arm 14 to a certain position, the first support arm 13 and the second support arm 14 can be locked by the connection between the locking member 193 and the first limiting hole 191 and the connection between the locking member 193 and the second limiting hole 192, so that the relative position of the first jaw 15 and the second jaw 16 is fixed and the first jaw 15 is kept in the spreading position; when it is necessary to adjust the position of the first jaw 15 relative to the second jaw 16, the locking member 193 can be loosened, and the position of the first support arm 13 relative to the second support arm 14 can be adjusted by moving the first support arm 13 relative to the second support arm 14, so as to adjust the position of the first jaw 15 relative to the second jaw 16 and achieve the purpose of adjusting the spreading degree of the first jaw 15 relative to the second jaw 16; in summary, through the first limiting structure, the position of the first support arm 13 relative to the second support arm 14 can be adjusted and locked, so as to achieve the purpose of adjusting the spreading degree of the first jaw 15 relative to the second jaw 16 and keeping the first jaw 15 in the spreading position.

[0064] Preferably, the locking member 193 is a screw or a pin.

[0065] Certainly, in alternative embodiments not shown in the drawings of the present application, according to actual needs, the first limiting structure can also include a plurality of second limiting holes 192 (the second limiting holes 192 are long holes or common regular holes, such as round holes), and the plurality of second limiting holes 192 are arranged at intervals on the second support arm 14 along the moving direction of the first support arm 13 relative to the second support arm 14; or, the first limiting hole 191 is a long hole arranged along the moving direction of the first support arm 13 relative to the second support arm 14; or, the first limiting structure includes a plurality of first limiting holes 191.

[0066] AsFigure 1 , Figure 4 , Figure 5 , Figure 8 and Figure 9 As shown in Figure 8 and Figure 9 , in the embodiment of the present invention, the spreading mechanism 10 includes two spreading structures 12 arranged at intervals. The two first support arms 13 of the two spreading structures 12 are connected, and at least a part of the connecting structure 21 is located in the gap between the two spreading structures 12. A more stable spreading effect can be achieved through the two spreading structures 12; at least a part of the connecting structure 21 is located in the gap between the two spreading structures 12, so that the gap between the two spreading structures 12 forms a slideway for the implant 30 to move. The implant 30 can be more stably transported through at least a part of the connecting structure 21 located in the gap between the two spreading structures 12, thereby realizing more accurate implantation of the implant 30. The connection of the two first support arms 13 of the two spreading structures 12 can improve the structural strength and connection stability.

[0067] Specifically, an artificial lamina prosthesis (i.e., the implant 30) can be fixed between the two second support arms 14 of the two spreading structures 12. The distance between the two second support arms 14 is 8 mm to 12 mm (preferably 10 mm), which can allow the placement of a conventional artificial lamina prosthesis; along the arrangement direction of the two second support arms 14, the width dimension of the first jaw 15 is 2 mm, and the overall width of the two spreading structures 12 is close to the width of the human cervical vertebra lamina.

[0068] As Figure 8 and Figure 10 shown in Figure 8 and Figure 10 , in the embodiment of the present invention, the holding structure 11 includes a first sleeve 111 and a first rotating shaft 112. The first sleeve 111 is connected to the second support arm 14, and the conveying mechanism 20 is located outside the first sleeve 111; the first rotating shaft 112 is arranged in the first sleeve 111 and is rotatably arranged around its own axis; wherein, one end of the first rotating shaft 112 is in threaded cooperation with the support 131 arranged on the first support arm 13, and the first sleeve 111 is provided with a second limiting structure 113 for preventing the support 131 from rotating. At least a part of the support 131 cooperates with the second limiting structure 113 to convert the spiral motion into the linear motion of the first support arm 13.

[0069] In the above setting, the first rotating shaft 112 is rotatable relative to the first sleeve 111. The first rotating shaft 112 drives the first support arm 13 through the support 131. Since the first rotating shaft 112 is in threaded cooperation with the support 131 and the second limiting structure 113 can prevent the support 131 from rotating, the rotational movement of the first rotating shaft 112 is converted into a linear movement of the support 131. That is, driven by the first rotating shaft 112, the support 131 moves relative to the second limiting structure 113, thereby achieving the purpose of the first support arm 13 moving relative to the second support arm 14, and enabling the first jaw 15 to switch between the open position and the storage position. Through the above setting, the purpose of switching the opening structure 12 between the open state and the storage state by the holding structure 11 is achieved, and the opening function of the opening mechanism 10 on the lamina is realized. Arranging the conveying mechanism 20 outside the first sleeve 111 is convenient for operation.

[0070] Preferably, as Figure 8 shown, in the embodiment of the present invention, the support 131 and the first jaw 15 are respectively located at opposite ends of the first support arm 13, which is convenient for assembly. An external thread is provided on the outer wall surface of one end of the first rotating shaft 112, and a first threaded hole is provided on the support 131. The first threaded hole has an internal thread adapted to the external thread, and the first rotating shaft 112 is in threaded cooperation with the support 131.

[0071] As Figure 5 shown, in the embodiment of the present invention, the second limiting structure 113 is a first limiting groove 114 provided on the first sleeve 111. At least part of the support 131 is located in the first limiting groove 114, and the support 131 is movably arranged relative to the first limiting groove 114 under the action of an external force.

[0072] In the above setting, the first limiting groove 114 prevents the support 131 from rotating. Since the first rotating shaft 112 is in threaded cooperation with the support 131, when the first rotating shaft 112 rotates, the rotational movement is converted into a linear movement, and the support 131 moves relative to the first limiting groove 114, thereby achieving the purpose of the first support arm 13 moving relative to the second support arm 14. Setting the first limiting groove 114 on the first sleeve 111 has a simple structure and is convenient for processing and assembly.

[0073] As Figures 1 to 5 and Figure 8 shown, in the embodiment of the present invention, the holding structure 11 further includes a first knob 115, and the first knob 115 is arranged at the end of the first rotating shaft 112 far from the first support arm 13. By applying an external force to the first knob 115, the first rotating shaft 112 can be driven to rotate. By setting the first knob 115, it is convenient to operate the first rotating shaft 112.

[0074] As Figure 4 and Figure 12As shown, in an embodiment of the present invention, the conveying mechanism 20 also includes a second sleeve 22 located outside the holding structure 11, the second sleeve 22 is movably arranged relative to the holding structure 11, and the connecting structure 21 is arranged in the second sleeve 22. The connecting structure 21 includes a connecting shaft rotatably arranged around its own axis, and one end of the connecting shaft extends out of the second sleeve 22.

[0075] In the above arrangement, the second sleeve 22 is located outside the holding structure 11, which is convenient for controlling the second sleeve 22 and moving the second sleeve 22 relative to the holding structure 11; one end of the connecting shaft extends out of the second sleeve 22 and can be connected to the implant 30, and the connecting shaft can be connected to the implant 30 by rotating the connecting shaft, which is convenient for the conveying mechanism 20 to connect and convey the implant 30, or the connecting shaft can be disconnected from the implant 30, so that the conveying mechanism 20 releases the implant 30; in summary, the functions of connecting, conveying and releasing the implant 30 can be realized by the connecting shaft.

[0076] Preferably, if Figure 11 , Figures 13 to 15 As shown, in an embodiment of the present invention, an external thread is provided on the outer wall surface of one end of the connecting shaft extending out of the second sleeve 22, and the connecting shaft is threadedly matched with the implant 30, so that the connecting shaft can be connected or disconnected with the implant 30 by screwing the connecting shaft.

[0077] like Figures 1 to 4 , Figure 11 , Figure 12 , Figure 14 and Figure 15 As shown, in an embodiment of the present invention, the second sleeve 22 includes a first sleeve segment 23 connected to the gripping structure 11 and a second sleeve segment 24 connected to the first sleeve segment 23, and there is an angle between the central axis of the first sleeve segment 23 and the central axis of the second sleeve segment 24, and the connecting shaft is arranged in the second sleeve segment 24; the conveying mechanism 20 also includes a second rotating shaft 25 arranged in the first sleeve segment 23, and the second rotating shaft 25 is rotatably arranged relative to the first sleeve segment 23, and one end of the second rotating shaft 25 is movably connected to the connecting shaft to drive the connecting shaft to rotate.

[0078] In the above arrangement, the first sleeve section 23 and the second sleeve section 24 are arranged at an angle, which can facilitate the connection between the first sleeve section 23 and the gripping structure 11 on the one hand, and can arrange the second sleeve section 24 in the gap between the two support structures 12 on the other hand. Since the connecting shaft arranged in the second sleeve section 24 is connected to the implant 30, such an arrangement can more smoothly transport the implant 30, which helps to accurately implant the implant 30. In addition, the rotation of the second rotating shaft 25 drives the connecting shaft to rotate. By setting the second rotating shaft 25, the connecting shaft can be operated more easily to rotate the connecting shaft.

[0079] Preferably, in the embodiments of the present invention, the second rotating shaft 25 is connected to the connecting shaft through a universal joint. Such a setting can transmit the rotational movement of the second rotating shaft 25 to the connecting shaft, causing the connecting shaft to rotate and achieving rotational transmission.

[0080] Such as Figures 1 to 4 , Figure 11 and Figures 13 to 15 As shown in, in the embodiments of the present invention, the conveying mechanism 20 further includes a second knob 26 connected to the second rotating shaft 25. The connecting shaft and the second knob 26 are respectively arranged at opposite ends of the second rotating shaft 25. Applying an external force to the second knob 26, the second knob 26 can drive the second rotating shaft 25 to rotate. By providing the second knob 26, the second rotating shaft 25 can be more easily operated, and the second rotating shaft 25 can be conveniently rotated. Arranging the connecting shaft and the second knob 26 at opposite ends of the second rotating shaft 25 can avoid interference.

[0081] Such as Figures 11 to 13 As shown in, in the embodiments of the present invention, the conveying mechanism 20 further includes a second limiting member 27. A third limiting hole 231 is provided on the first sleeve section 23, and a second limiting groove 251 is provided on the outer wall surface of the second rotating shaft 25. The second limiting member 27 is inserted into the third limiting hole 231, and one end of the second limiting member 27 passes through the third limiting hole 231 and cooperates with the second limiting groove 251.

[0082] In the above setting, the second limiting member 27 is connected to the third limiting hole 231 and cooperates with the second limiting groove 251, which can prevent the movement of the second rotating shaft 25 along its central axis direction relative to the first sleeve section 23, enabling the second rotating shaft 25 to only generate rotational movement around its own axis relative to the first sleeve section 23, achieving the purpose of rotatably arranging the second rotating shaft 25 relative to the first sleeve section 23 and ensuring the stability of the rotation of the second rotating shaft 25.

[0083] Such as Figures 1 to 3 , Figure 11 , Figure 12 , Figure 14 and Figure 15As shown, in an embodiment of the present invention, the conveying mechanism 20 further includes a mounting base 28 connected to the second sleeve section 24. The mounting base 28 is disposed at one end of the second sleeve section 24 away from the first sleeve section 23, and a mounting through hole 281 is provided on the mounting base 28. The mounting through hole 281 is correspondingly arranged with the mounting hole on the implant 30. After the conveying mechanism 20 conveys the implant 30 to the first clamp head 15, the implant 30 can be installed through the mounting through hole 281, and the implant 30 is installed on the lamina. Then, the connecting shaft can be disconnected from the implant 30, and the lamina spreading device can be taken out to complete the implantation of the implant 30. Through the mounting through hole 281, accurate nail placement can be achieved, avoiding problems such as screw detachment and wrong direction during nail placement, and accurately installing the implant 30 on the lamina.

[0084] As Figure 1 , Figure 2 , Figure 4 , Figure 11 and Figure 16 As shown, in an embodiment of the present invention, the lamina spreading device further includes a moving mechanism 40. The conveying mechanism 20 is connected to the holding structure 11 through the moving mechanism 40. The moving mechanism 40 is movably arranged relative to the holding structure 11 to drive the conveying mechanism 20 to move, and the moving mechanism 40 has the function of fixedly limiting the conveying mechanism 20 relative to the holding structure 11. By driving the conveying mechanism 20 to move relative to the holding structure 11 through the moving mechanism 40, the purpose of the conveying mechanism 20 to convey the implant 30 is achieved, and when the implant 30 is conveyed to the lamina, the conveying mechanism 20 can be fixed at a certain position through the connection between the moving mechanism 40 and the holding structure 11, so that the relative position between the implant 30 and the lamina is fixed.

[0085] As Figure 16 As shown, in an embodiment of the present invention, the moving mechanism 40 includes a moving structure 41 and a locking structure 42. The moving structure 41 includes a moving body 411 and a first groove 412 provided on the moving body 411 that cooperates with at least part of the holding structure 11. The conveying mechanism 20 is connected to the moving body 411. The locking structure 42 is penetrated through the moving body 411, and the locking structure 42 is movably arranged relative to the moving body 411 so that one end of the locking structure 42 abuts against the outer wall surface of the holding structure 11 to lock the moving structure 41 and the holding structure 11.

[0086] In the above settings, the moving body 411 is movably arranged relative to the holding structure 11. The moving body 411 drives the conveying mechanism 20 to move relative to the holding structure 11, achieving the purpose of the conveying mechanism 20 to convey the implant 30. The moving structure 41 and the holding structure 11 can be locked by the locking structure 42, so that the relative positions of the moving structure 41 and the holding structure 11 are fixed. When the conveying mechanism 20 conveys the implant 30 to the lamina, the moving structure 41 can be locked by the locking structure 42, so that the implant 30 is fixed relative to the lamina, facilitating the installation of the implant 30. The holding structure 11 cooperates with the first groove 412 to enable the moving body 411 to move relative to the holding structure 11. The locking structure 42 moves relative to the moving body 411, so that the locking structure 42 abuts against the holding structure 11, and the holding structure 11 also abuts against the moving body 411, thereby achieving the purpose of locking the moving body 411 and the holding structure 11 and fixing the relative positions of the moving structure 41 and the holding structure 11.

[0087] Specifically, as Figure 16 shown, in the embodiment of the present invention, the moving body 411 is sleeved on the outer periphery of the first sleeve 111 of the holding structure 11 through the first groove 412. The locking structure 42 includes a screw. A second threaded hole communicating with the first groove 412 is provided on the moving body 411. The screw is in threaded cooperation with the second threaded hole. By screwing the screw, the screw and the moving body 411 can both abut against the holding structure 11, thereby achieving the purpose of locking the moving structure 41 and the holding structure 11 through the locking structure 42.

[0088] As Figure 16 shown, in the embodiment of the present invention, the moving structure 41 further includes a second groove 413 provided on the moving body 411. The second groove 413 and the first groove 412 are respectively located on opposite sides of the moving body 411. The conveying mechanism 20 is snap-connected to the second groove 413. The second groove 413 and the first groove 412 are arranged oppositely, which can avoid the problem of mutual interference between the conveying mechanism 20 and the holding structure 11. The conveying mechanism 20 is snap-connected in the second groove 413, so that the conveying mechanism 20 is fixedly connected to the moving body 411, and the purpose of driving the conveying mechanism 20 to move by the moving body 411 can be achieved.

[0089] Of course, in an alternative embodiment not shown in the drawings of the present application, according to actual needs, the conveying mechanism 20 can also be connected to the moving body 411 by other connection methods, such as threaded connection.

[0090] In the embodiment of the present invention, the whole lamina spreading device includes a spreading mechanism 10, a conveying mechanism 20 and a moving mechanism 40. The conveying mechanism 20 is connected to the spreading mechanism 10 through the moving mechanism 40 and is movably arranged relative to the spreading mechanism 10.

[0091] The first rotating shaft 112 and the first support arm 13 in the spreading mechanism 10 are connected by threads, and other components are fixed by pins or welding (for example, the first support arm 13 and the first clamp head 15 are connected by pins, and the first sleeve 111 and the second support arm 14 are welded). By rotating the first rotating shaft 112 by the first knob 115, the first support arm 13 can be moved in the direction of the first clamp head 15. The first support arm 13 moves relative to the second support arm 14, and the first clamp head 15 is pivotally connected to the second clamp head 16 by the connecting rod 17, so as to achieve the effect of spreading the first clamp head 15 upward.

[0092] In the conveying mechanism 20, the front end thread of the connecting shaft is used to clamp the artificial vertebral lamina prosthesis (i.e., the implant 30), the mounting seat 28 has a directional nailing function, the mounting seat 28 has a groove that matches the contour of the vertebral lamina side plate of the artificial vertebral lamina prosthesis, the mounting through hole 281 is consistent with the position of the nail hole of the vertebral lamina side plate of the artificial vertebral lamina prosthesis, the second rotating shaft 25 is connected to the connecting shaft through a universal joint structure, and the second limiting groove 251 cooperates with the pin (i.e., the second limiting member 27) to realize the limiting function of the second rotating shaft 25. When in use, the rear end of the second rotating shaft 25 can be rotated to realize the screwing in and out of the front end thread of the connecting shaft relative to the implant 30.

[0093] like Figures 17 to 20 As shown, when using the lamina distraction device, the lamina on both sides of the lamina must be cut off in advance, so that the entire lamina and spinous process are in a free state. The use is divided into three stages. The first stage is the placement stage. The front thread of the connecting shaft of the conveying mechanism is threadedly fixed with the threaded hole of the artificial lamina assembly. The moving mechanism drives the conveying mechanism to convey the artificial lamina assembly to the first clamp head. The second support arm part of the distraction mechanism is placed on the side block and temporarily fixed by the second clamp head part. It is necessary to ensure that the tool is consistent with the lamina cutting direction, so that the first clamp head and the second clamp head are placed in the lamina gap, the second support arm and the second clamp head are against the vertebral body part, and the first clamp head is against the lamina part; the second stage is the lifting stage, rotate the first knob, The first support arm moves forward, driving the first clamp head to stretch upward, thereby completing the top lifting. The height of the top lifting can be controlled by controlling the number of turns of the first knob. The third stage is the implantation stage. After the top lifting is completed, the locking structure is released, and the entire moving mechanism and the conveying mechanism slide down along the first sleeve, driving the artificial lamina prosthesis to be implanted into the lamina gap along the lamina incision direction, and the lamina side fixing screws are accurately implanted through the mounting seat. After the screws are fixed, the second knob is rotated to drive the second rotating shaft to rotate, so that the artificial lamina prosthesis can be detached from the connecting shaft and the entire tool is evacuated, thus completing the entire implantation process.

[0094] Rotating the first knob by a certain number of turns can achieve precise lifting to different heights. The normal lifting distance is 6 mm to 8 mm. For each 1-grid rotation of the first knob, the lifting height increases by 0.5 mm. The angle between the mounting base direction and the lamina side plane of the artificial lamina prosthesis is about 5° to 10°, which can achieve pressurization between the artificial lamina prosthesis and the lateral mass during screw placement, enabling better postoperative fusion and making the implant more secure.

[0095] The technical solution of this application has the following advantages:

[0096] 1. This lamina spreader has comprehensive functions. While achieving lamina spreading, it can also realize the connection, implantation, and screw fixation of the artificial lamina prosthesis;

[0097] 2. This lamina spreader is easy to operate. Rotating the first knob can achieve vertical spreading of the lamina, and loosening the locking structure can realize the sliding implantation of the prosthesis;

[0098] 3. This lamina spreader can achieve precise implantation of the artificial lamina prosthesis. By moving the conveying mechanism relative to the holding structure, the prosthesis can be precisely implanted into the lamina space;

[0099] 4. Precise screw placement can be achieved through the mounting through-hole, avoiding problems such as screw detachment and incorrect direction during screw placement, and the implantable part can be accurately installed on the lamina.

[0100] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: The spreading mechanism and the conveying mechanism are connected to form an integral structure. The spreading mechanism is used to spread the lamina, and the conveying mechanism is used to connect and convey the implantable part, so that the implantable part moves to the first jaw and the second jaw, that is, the implantable part moves to the spread lamina. Under the action of external force, the conveying mechanism releases the implantable part, thereby realizing the accurate implantation of the implantable part. That is to say, the spreading mechanism and the conveying mechanism are regarded as a whole. When the lamina is spread by the spreading mechanism, the implantable part can be connected and conveyed to the spread lamina by the conveying mechanism, and then under the action of external force, the conveying mechanism releases the implantable part, and the implantable part is accurately implanted into the spread lamina, thus achieving the purpose of accurately implanting the implantable part into the lamina while spreading the lamina; Since the purpose of conveying the implantable part to the spread lamina can be achieved by moving the conveying mechanism relative to the holding structure, therefore, the requirements of this application's lamina spreader for the field of view and the operable range are relatively low; In summary, the lamina spreader of this application can achieve the purpose of accurately implanting the implantable part into the lamina while spreading the lamina within a limited field of view and operable range, facilitating the operation.

[0101] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0102] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0103] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0104] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A lamina spreader, characterized in that, Comprising: An expansion mechanism (10), including a holding structure (11) and an expansion structure (12) connected to the holding structure (11). The expansion structure (12) includes a first support arm (13) and a second support arm (14) connected to the first support arm (13). A first clamp head (15) is movably arranged on the first support arm (13), and a second clamp head (16) is arranged on the second support arm (14). The first clamp head (15) has an expansion position away from the second clamp head (16) and a storage position close to the second clamp head (16); A conveying mechanism (20) is arranged on the holding structure (11). The conveying mechanism (20) includes a connection structure (21) for connecting or releasing an implant (30). The conveying mechanism (20) is movably arranged relative to the holding structure (11) so that the implant (30) can move to the first clamp head (15) and / or the second clamp head (16); The expansion mechanism (10) includes two spaced-apart expansion structures (12). The two first support arms (13) of the two expansion structures (12) are connected, and at least part of the connection structure (21) is located in the gap between the two expansion structures (12); The holding structure (11) includes: A first sleeve (111) connected to the second support arm (14), and the conveying mechanism (20) is located outside the first sleeve (111); A first rotating shaft (112) is arranged in the first sleeve (111), and the first rotating shaft (112) is rotatably arranged around its own axis; Wherein, one end of the first rotating shaft (112) is in threaded cooperation with a support (131) arranged on the first support arm (13). A second limiting structure (113) for preventing the support (131) from rotating is arranged on the first sleeve (111). At least part of the support (131) cooperates with the second limiting structure (113) to convert the helical motion into the linear motion of the first support arm (13).

2. The lamina spreader device according to claim 1, characterized in that, The expansion structure (12) further includes a connecting rod (17). One end of the connecting rod (17) is pivotally connected to the first clamp head (15), and the other end of the connecting rod (17) is pivotally connected to the second clamp head (16). The first clamp head (15) is pivotally connected to the first support arm (13), and the second clamp head (16) is connected to the second support arm (14). Under the action of an external force, the first support arm (13) is movably arranged relative to the second support arm (14) so that the first clamp head (15) switches between the expansion position and the storage position.

3. The lamina spreader device according to claim 2, wherein, The expansion structure (12) further includes a receiving groove (18) for receiving at least part of the connecting rod (17). The receiving groove (18) is arranged on the first support arm (13) or the second support arm (14).

4. The lamina spreader device according to claim 2, wherein The spreading mechanism (10) further includes a first limiting structure for adjusting the position of the first support arm (13) relative to the second support arm (14), and the first limiting structure includes: A first limiting hole (191) provided on the first support arm (13); A second limiting hole (192), which is a long hole provided on the second support arm (14); A locking member (193) connected to the first limiting hole (191) and the second limiting hole (192) respectively to lock the first support arm (13) to the second support arm (14).

5. The lamina spreader according to any one of claims 1 to 4, characterized in that The second limiting structure (113) is a first limiting groove (114) provided on the first sleeve (111), and at least a part of the support (131) is located in the first limiting groove (114), and the support (131) is movably arranged relative to the first limiting groove (114) under the action of an external force; or, The holding structure (11) further includes a first knob (115) provided at an end of the first rotating shaft (112) away from the first support arm (13).

6. The lamina spreader device according to any one of claims 1 to 4, characterized in that, The conveying mechanism (20) further includes a second sleeve (22) located outside the holding structure (11), the second sleeve (22) is movably arranged relative to the holding structure (11), the connecting structure (21) is provided in the second sleeve (22), and the connecting structure (21) includes a connecting shaft rotatably arranged about its own axis, and one end of the connecting shaft extends out of the second sleeve (22).

7. The lamina spreader device according to claim 6, wherein, The second sleeve (22) includes a first sleeve section (23) connected to the holding structure (11) and a second sleeve section (24) connected to the first sleeve section (23), and there is an included angle between the central axis of the first sleeve section (23) and the central axis of the second sleeve section (24), and the connecting shaft is arranged in the second sleeve section (24); the conveying mechanism (20) further includes a second rotating shaft (25) provided in the first sleeve section (23), the second rotating shaft (25) is rotatably arranged relative to the first sleeve section (23), and one end of the second rotating shaft (25) is movably connected to the connecting shaft to drive the connecting shaft to rotate.

8. The lamina spreader according to claim 7, characterized in that The conveying mechanism (20) further includes a second knob (26) connected to the second rotating shaft (25), and the connecting shaft and the second knob (26) are respectively arranged at opposite ends of the second rotating shaft (25); or, The conveying mechanism (20) further includes a second limiting member (27). A third limiting hole (231) is provided on the first sleeve section (23). A second limiting groove (251) is provided on the outer wall surface of the second rotating shaft (25). The second limiting member (27) is inserted into the third limiting hole (231), and one end of the second limiting member (27) passes through the third limiting hole (231) and cooperates with the second limiting groove (251); or, The conveying mechanism (20) further includes a mounting seat (28) connected to the second sleeve section (24). The mounting seat (28) is arranged at one end of the second sleeve section (24) far from the first sleeve section (23), and a mounting through hole (281) is provided on the mounting seat (28).

9. The lamina spreader device according to any one of claims 1 to 4, characterized in that, The lamina spreader further includes a moving mechanism (40). The conveying mechanism (20) is connected to the holding structure (11) through the moving mechanism (40). The moving mechanism (40) is movably arranged relative to the holding structure (11) to drive the conveying mechanism (20) to move.

10. The lamina spreader device according to claim 9, characterized in that, The moving mechanism (40) includes: A moving structure (41), including a moving body (411) and a first groove (412) provided on the moving body (411) and cooperating with at least a part of the holding structure (11). The conveying mechanism (20) is connected to the moving body (411); A locking structure (42) is inserted through the moving body (411), and the locking structure (42) is movably arranged relative to the moving body (411) so that one end of the locking structure (42) abuts against the outer wall surface of the holding structure (11) to lock the moving structure (41) and the holding structure (11).

11. The lamina spreader device according to claim 10, characterized in that, The moving structure (41) further includes a second groove (413) provided on the moving body (411). The second groove (413) and the first groove (412) are respectively located on opposite sides of the moving body (411). The conveying mechanism (20) is connected to the second groove (413) in a snap-fit manner.

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