End plate reamer with adjustable width

Abstract

The utility model discloses a width-adjustable end plate reamer. The width-adjustable end plate reamer comprises a hollow pipe, a screw mechanism and a blade mechanism, the blade mechanism comprises a pushing wedge-shaped part and blade parts located on the two opposite sides of the pushing wedge-shaped part, the pushing wedge-shaped part is located in the hollow pipe, and the blade parts penetrate through the pipe wall of the hollow pipe and are in sliding connection with the pushing wedge-shaped part so as to adjust the width of the blade mechanism in the radial direction of the hollow pipe; the spiral mechanism part is rotationally arranged in the hollow pipe in a sleeved mode and connected with the pushing wedge-shaped component, the spiral mechanism part moves in the axial direction of the hollow pipe to drive the pushing wedge-shaped component to move in the axial direction of the hollow pipe, and the pushing wedge-shaped component moves in the axial direction of the hollow pipe to drive the blade component to move in the radial direction of the hollow pipe so as to adjust the gap of the cone. According to the end plate reamer with the adjustable width, the width of the reamer can be automatically adjusted, and the end plate reamer is suitable for different intervertebral spaces.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical surgical instruments, and particularly relates to an endplate reamer with adjustable width. Background Art

[0002] Transforaminal lumbar interbody fusion (TLIF) has gradually become one of the most commonly used lumbar decompression surgeries in recent years, which can not only provide effective decompression of nerve tissue but also avoid nerve injury. In lumbar interbody fusion, after removing the protruding intervertebral disc, autologous bone or allogeneic bone is filled into the intervertebral space while an intervertebral fusion cage is implanted to form a firm bone connection between the two vertebral bodies, achieving the purpose of vertebral body fusion.

[0003] The success rate of lumbar interbody fusion depends to a large extent on the treatment degree of the vertebral body space, that is, whether tissues such as the nucleus pulposus, annulus fibrosus, and cartilage endplate are completely removed to fully expose the bony endplate and increase the bony contact area of the bone grafting surface. Before treating the cartilage endplate, different reamers need to be used to expand the intervertebral space and scrape out the cartilage endplate for subsequent operations. Content of the Utility Model

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the utility model is to provide an endplate reamer with adjustable width, which can realize the adjustment of the vertebral body space.

[0005] To achieve the above purpose and other related purposes, the utility model provides an endplate reamer with adjustable width, including a hollow tube, a spiral mechanism, and a blade mechanism;

[0006] The blade mechanism includes a pushing wedge-shaped component and blade components located on opposite sides of the pushing wedge-shaped component. The pushing wedge-shaped component is located inside the hollow tube, and the blade components penetrate through the tube wall of the hollow tube and are slidably connected to the pushing wedge-shaped component to adjust the width of the blade mechanism in the radial direction of the hollow tube;

[0007] Part of the spiral mechanism is rotatably sleeved inside the hollow tube and is connected to the pushing wedge-shaped component. The spiral mechanism moves axially along the hollow tube to drive the pushing wedge-shaped component to move axially along the hollow tube, and the axial movement of the pushing wedge-shaped component along the hollow tube drives the blade components to move radially along the hollow tube to adjust the space between vertebral bodies.

[0008] Furthermore, when the blade components move radially along the hollow tube, the distance between the blade components is 7 - 8 mm when the blade components on opposite sides of the pushing wedge-shaped component shrink to the minimum, and the distance between the blade components is 12 - 13 mm when the blade components on opposite sides of the pushing wedge-shaped component expand to the maximum.

[0009] Furthermore, openings are provided at opposite positions on the tube wall of the end of the hollow tube far from the spiral mechanism, and the blade components penetrate through the openings.

[0010] Further, sliding blocks protruding outward relative to the wedge-shaped side surfaces are provided on the wedge-shaped side surfaces on both sides of the pushing wedge-shaped component, and concave chutes are provided on the moving side surfaces of the blade component opposite to the wedge-shaped side surfaces of the pushing wedge-shaped component; alternatively, concave chutes recessed inward relative to the wedge-shaped side surfaces are provided on the wedge-shaped side surfaces on both sides of the pushing wedge-shaped component, and sliding blocks protruding outward are provided on the moving side surfaces of the blade component opposite to the wedge-shaped side surfaces of the pushing wedge-shaped component; the sliding blocks and the chutes are matched to enable the sliding blocks to slide in the chutes.

[0011] Further, the screw mechanism includes a hand-held rotating member, a connecting member, and a sliding rod;

[0012] The hand-held rotating member is partially rotatably sleeved in the hollow tube;

[0013] The connecting member and the sliding rod are sleeved in the hollow tube. An active cavity is provided in the connecting member, and the end of the hand-held rotating member is provided in the active cavity;

[0014] The sliding rod is fixedly connected to the connecting member and the pushing wedge-shaped component respectively.

[0015] Furthermore, one end of the hand-held rotating member is provided outside the hollow tube, and the other end is provided in the active cavity. The hand-held rotating member is threadedly connected to the hollow tube.

[0016] Further, a hand-held grip is provided at one end of the hollow tube away from the blade mechanism.

[0017] Furthermore, the hand-held grip includes a first grip section and a second grip section, and the first grip section and the second grip section are symmetrically located on opposite sides of one end of the hollow tube away from the blade mechanism respectively.

[0018] The adjustable-width endplate reamer provided by the present utility model can realize self-adjusting the width of the reamer to adapt to different vertebral intervals. It can realize adjusting the vertebral interval, restoring the vertebral interval to the height before degeneration, and effectively treating tissues such as the endplate. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 Shown is the overall structural schematic diagram of the adjustable-width endplate reamer in the present utility model.

[0021] Figure 2 Shown is a partial structural schematic diagram of the spiral mechanism in the end - plate reamer with adjustable width of the present utility model.

[0022] Figure 3 Shown is a connection structural schematic diagram of the spiral mechanism in the end - plate reamer with adjustable width of the present utility model inside the hollow tube.

[0023] Figure 4 Shown is a partial connection structural schematic diagram of the spiral mechanism in the end - plate reamer with adjustable width of the present utility model.

[0024] Figure 5 Shown is a perspective structural schematic diagram of the connecting piece in the end - plate reamer with adjustable width of the present utility model.

[0025] Figure 6 Shown is a structural sectional view of the connecting piece in the end - plate reamer with adjustable width of the present utility model.

[0026] Figure 7 Shown is a structural schematic diagram of the blade mechanism in the end - plate reamer with adjustable width of the present utility model.

[0027] Figure 8 Shown is a connection structural schematic diagram of the pushing wedge member in the end - plate reamer with adjustable width of the present utility model.

[0028] Figure 9 Shown is a structural schematic diagram of the pushing wedge member in the end - plate reamer with adjustable width of the present utility model.

[0029] Figure 10 Shown is a structural schematic diagram of the blade member in the end - plate reamer with adjustable width of the present utility model.

[0030] Figures 1-10 In it, 1 - hollow tube; 11 - opening; 2 - spiral mechanism; 21 - hand - held rotating part; 22 - connecting piece; 221 - movable cavity; 23 - sliding rod; 3 - blade mechanism; 31 - pushing wedge member; 311 - wedge side; 32 - blade member; 321 - moving side; 4 - hand - held grip; 41 - first grip section; 42 - second grip section; H - the distance between the blade members on the opposite sides of the pushing wedge member. Detailed Embodiments

[0031] Combined with the following specific embodiments and drawings, the invention will be further described in detail. The processes, conditions, experimental methods, etc. for implementing the present invention, except for the specifically mentioned content below, are all common knowledge and well - known common sense in the art, and the present invention has no particularly restricted content.

[0032] In the description of the present utility model, it should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present utility model. Therefore, they do not have technical substantial significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the efficacy that the present utility model can produce and the purpose that can be achieved, should still fall within the scope that the technical content disclosed by the present utility model can cover. At the same time, the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] In addition, in the description of the present utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0035] Generally, the size of the existing endplate reamer cannot be changed. In order to achieve the purpose of expanding the intervertebral space during the operation, it is necessary to frequently replace the endplate reamer, which increases the surgical steps, wastes time, and also increases the surgical risk. At the same time, the expanded intervertebral space will fall back during the operation, and it is necessary to adjust the size of the endplate reamer in a timely manner, making the operation more cumbersome.

[0036] Therefore, in order to solve the above problems, the present utility model provides an endplate reamer with adjustable width, as Figures 1-10 shown, including a hollow tube 1, a spiral mechanism 2, and a blade mechanism 3;

[0037] The blade mechanism 3 includes a pushing wedge member 31 and blade members 32 located on opposite sides of the pushing wedge member 31. The pushing wedge member 31 is located inside the hollow tube 1, and the blade members 32 penetrate the tube wall of the hollow tube 1 and are slidably connected to the pushing wedge member 31 to adjust the width of the blade mechanism 32 in the radial direction of the hollow tube 1.

[0038] Part of the screw mechanism 2 is rotatably sleeved inside the hollow tube 1 and is connected to the pushing wedge member 31. The screw mechanism 2 moves axially along the hollow tube 1 to drive the pushing wedge member 31 to move axially along the hollow tube 1. The axial movement of the pushing wedge member 31 along the hollow tube 1 drives the blade members 32 to move radially along the hollow tube 1 to adjust the clearance of the vertebral body.

[0039] The blade member 32 in the above-mentioned blade mechanism 3 is a reamer blade plate commonly used. The blade can be expanded through a transmission shaft to widen the vertebral body clearance and scrape the end plate.

[0040] In a specific embodiment, as Figure 7 shown, when the blade members 32 move radially along the hollow tube 1, the distance H between the blade members 32 is minimized to 7 - 8 mm when the blade members 32 located on opposite sides of the pushing wedge member 31 are contracted, and the distance H between the blade members 32 is maximized to 12 - 13 mm when the blade members 32 located on opposite sides of the pushing wedge member 31 are expanded.

[0041] In a specific embodiment, as Figure 1 shown, openings 11 are provided at opposite positions on the tube wall of the end of the hollow tube 1 away from the screw mechanism 2. The blade members 32 penetrate through the openings 11, which is used for the blade members 32 to pass through to realize the function of adjusting the vertebral body clearance.

[0042] In a specific embodiment, sliders protruding relative to the outer side of the wedge side surfaces 311 are provided on the wedge side surfaces 311 on both sides of the pushing wedge member 31, and concave chutes are provided on the moving side surfaces 321 of the blade members 32 opposite to the wedge side surfaces 311 of the pushing wedge member 31; alternatively, concave chutes recessed relative to the inner side of the wedge side surfaces 311 are provided on the wedge side surfaces 311 on both sides of the pushing wedge member 31, and sliders protruding outward are provided on the moving side surfaces 321 of the blade members 32 opposite to the wedge side surfaces 311 of the pushing wedge member 31; the sliders and the chutes are matched to enable the sliders to slide in the chutes.

[0043] The sliding connection is realized through the matching of the chute and the slider, so as to realize that the axial movement of the pushing wedge member 31 along the hollow tube 1 drives each blade member 32 slidably connected thereto to move radially along the hollow tube 1.

[0044] The above-mentioned spiral mechanism 2 is partially rotatably sleeved in the hollow tube 1 and is connected to each blade component 32 through a pushing wedge component 31. The spiral mechanism 2 moves axially along the hollow tube 1, causing the pushing wedge component 31 to move axially along the hollow tube 1. Furthermore, the axial movement of the pushing wedge component 31 along the hollow tube 1 drives the blade component 32 slidably connected thereto to move radially along the hollow tube 1 to expand the vertebral body space, that is, each blade component 32 opens or closes, achieving the purpose of adjusting the width of the blade mechanism 3 of the reamer in the radial direction of the hollow tube 1.

[0045] The endplate reamer with adjustable width can adjust the width of the reamer. Specifically, it can be an instrument for cleaning the cartilage endplate in spinal endoscopic surgery and is used for lumbar fusion under arthroscope or spinal endoscope.

[0046] In a specific embodiment, the spiral mechanism 2 includes a hand-held rotating member 21, a connecting member 22, and a sliding rod 23;

[0047] The hand-held rotating member 21 is partially rotatably sleeved in the hollow tube 1;

[0048] The connecting member 22 and the sliding rod 23 are sleeved in the hollow tube 1. An active cavity 221 is provided in the connecting member 22, and the end of the hand-held rotating member 21 is arranged in the active cavity 221;

[0049] The sliding rod 23 is fixedly connected to the connecting member 22 and the pushing wedge component 31 respectively.

[0050] Specifically, one end of the hand-held rotating member 21 is arranged outside the hollow tube 1, and the other end is arranged in the active cavity 221. The hand-held rotating member 21 is threadedly connected to the hollow tube 1.

[0051] In a further embodiment, an external thread is provided on the side wall of the hand-held rotating member 21, and an internal thread is provided on the inner wall of the connection end of the hollow tube 1 and the hand-held rotating member 21. The external thread and the internal thread are threadedly connected to enable the hand-held rotating member 21 to move axially along the hollow tube 1 in a spiral manner, thereby driving the sliding rod 23 fixedly connected through the active cavity 221 to move axially along the hollow tube 1, and driving the pushing wedge component 31 connected to the sliding rod 23 to move axially along the hollow tube 1.

[0052] The end of the above-mentioned hand-held rotating member 21 is arranged in the active cavity 221, and it can be in a convex shape that fits the active cavity 221, so that the hand-held rotating member 21 is movably fixed in the active cavity 221, facilitating the hand-held rotating member 21 to move axially along the hollow tube 1 in a spiral manner.

[0053] During the rotation of the above-mentioned handheld rotating part 21 within the hollow tube 1, the axial movement of the hollow tube 1 is achieved in a circumferential spiral manner along the hollow tube 1, thereby driving the sliding rod 23 to move axially along the hollow tube 1. An internal thread can be provided on the inner side of the hollow tube 1, and an external thread can be provided on the handheld rotating part 21 to form a threaded connection. The handheld rotating part 21 is threadedly connected to the hollow tube 1, and the pushing wedge member 31 can be fixed at a certain position, so that the two relatively arranged blade members 32 in the blade mechanism 3 are fixed at a certain position, and the reamer width can only be changed by rotating the handheld rotating part 21.

[0054] The axial movement of the above-mentioned sliding rod 23 along the hollow tube 1 causes the pushing wedge member 31 to move axially along the hollow tube 1 accordingly. At the same time, the axial movement of the pushing wedge member 31 along the hollow tube 1 drives the blade member 32 slidably connected thereto to move radially along the hollow tube 1, that is, each blade member 32 opens or closes, achieving the purpose of expanding or shrinking the width of the vertebral reamer and gradually expanding the vertebral body space.

[0055] In a specific embodiment, a handheld grip 4 is provided at one end of the hollow tube 1 away from the blade mechanism 3. By rotating the handheld grip 4 circumferentially along the hollow tube 1, the connected hollow tube 1 is driven to rotate circumferentially, so that the blade member 32 rotates circumferentially along the hollow tube 1, and the cutting edge side of the blade member 32 rotates to scrape the endplate tissue.

[0056] Specifically, the handheld grip 4 includes a first grip section 41 and a second grip section 42, and the first grip section 41 and the second grip section 42 are symmetrically located on opposite sides of one end of the hollow tube 1 away from the blade mechanism 3 respectively.

[0057] When using this adjustable-width endplate reamer, the operator inserts the cutting edge sides of the two blade members 32 in the blade mechanism 3 into the space between two vertebral bodies, holds the handheld rotating part 21 by hand, and rotates the handheld rotating part 21 counterclockwise, so that the circumferential movement of the handheld rotating part 21 along the hollow tube 1 drives the sliding rod 23 to move axially along the hollow tube 1 synchronously. Since the sliding rod 23 does not rotate, the pushing wedge member 31 is driven to move axially along the hollow tube 1 to drive the blade member 32 to move radially along the hollow tube 1. The handheld rotating part 21 and the hollow tube 1 are preferably threadedly connected, and the tight fit between the handheld rotating part 21 and the hollow tube 1 can ensure that the pushing wedge member 31 is stable at a fixed position and will not move by itself. If it is necessary to adjust the width between the relative blade members 32 in the reamer, only need to manually rotate the handheld rotating part 21 clockwise or counterclockwise. After adjusting to the appropriate width between the relative blade members 32 in the reamer, the handheld grip 4 can be rotated, thereby driving the connected hollow tube 1 to rotate circumferentially, so that the blade member 32 rotates circumferentially along the hollow tube 1, and the cutting edge side of the blade member 32 rotates to scrape the endplate tissue.

[0058] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not intended to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. An endplate reamer with adjustable width, characterized in that, Comprising: A hollow tube (1), a screw mechanism (2), and a blade mechanism (3); wherein, The blade mechanism (3) includes: a pushing wedge member (31) and blade members (32) located on opposite sides of the pushing wedge member (31). The pushing wedge member (31) is located inside the hollow tube (1), and the blade members (32) penetrate through the tube wall of the hollow tube (1) and are slidably connected to the pushing wedge member (31) to adjust the width of the blade mechanism (3) in the radial direction of the hollow tube (1); Part of the screw mechanism (2) is rotatably sleeved inside the hollow tube (1) and is connected to the pushing wedge member (31). Part of the screw mechanism (2) moves axially along the hollow tube (1) to drive the pushing wedge member (31) to move axially along the hollow tube (1), and the pushing wedge member (31) moving axially along the hollow tube (1) drives the blade members (32) to move radially along the hollow tube (1).

2. The adjustable-width end plate reamer according to claim 1, wherein, Openings (11) are provided at opposite positions on the tube wall of the end of the hollow tube (1) away from the screw mechanism (2), and the blade members (32) penetrate through the openings (11).

3. The adjustable-width endplate reamer according to claim 1, wherein, Sliders protruding outward relative to the wedge-shaped side surfaces (311) are provided on the wedge-shaped side surfaces (311) on both sides of the pushing wedge member (31), and concave grooves are provided on the moving side surfaces (321) of the blade members (32) opposite to the wedge-shaped side surfaces (311) of the pushing wedge member (31).

4. The adjustable-width endplate reamer according to claim 1, wherein, Grooves recessed inward relative to the wedge-shaped side surfaces (311) are provided on the wedge-shaped side surfaces (311) on both sides of the pushing wedge member (31), and sliders protruding outward are provided on the moving side surfaces (321) of the blade members (32) opposite to the wedge-shaped side surfaces (311) of the pushing wedge member (31); The sliders and the grooves are matched to enable the sliders to slide in the grooves.

5. The adjustable-width endplate reamer according to claim 1, wherein When the blade members (32) move radially along the hollow tube (1), the distance between the blade members (32) is 7 - 8 mm when the blade members (32) on opposite sides of the pushing wedge member (31) are contracted to the minimum, and the distance between the blade members (32) is 12 - 13 mm when the blade members (32) on opposite sides of the pushing wedge member (31) are expanded to the maximum.

6. The adjustable-width endplate reamer according to claim 1, characterized in that The screw mechanism (2) includes: A hand-held rotating member (21), a connecting member (22), and a sliding rod (23); Part of the hand-held rotating member (21) is rotatably sleeved inside the hollow tube (1); The connecting member (22) and the sliding rod (23) are sleeved inside the hollow tube (1). An active cavity (221) is provided inside the connecting member (22), and the end of the hand-held rotating member (21) is provided inside the active cavity (221); The sliding rod (23) is fixedly connected to the connecting member (22) and the pushing wedge member (31) respectively.

7. The adjustable-width endplate reamer according to claim 6, wherein, One end of the hand-held rotating member (21) is provided outside the hollow tube (1), and the other end is provided inside the active cavity (221). The hand-held rotating member (21) is threadedly connected to the hollow tube (1).

8. The adjustable-width endplate reamer according to claim 1, characterized in that A hand-held grip (4) is provided at the end of the hollow tube (1) away from the blade mechanism (3).

9. The adjustable-width endplate reamer according to claim 8, characterized in that, The handheld grip (4) includes: a first grip section (41) and a second grip section (42), and the first grip section (41) and the second grip section (42) are symmetrically located on opposite sides of the end of the hollow tube (1) away from the blade mechanism (3) respectively.

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