Nail bed cutter

Abstract

The invention provides a nail bed cutter. The nail bed cutter comprises a nail bed cutting part, the cutting guide part is connected with the nail bed cutting part, the cutting guide part comprises a guide piece, the guide piece is provided with a cutting guide channel, and the nail bed cutting part moves along the cutting guide channel; the angle adjusting part is connected with the cutting guide part, and the angle adjusting part is used for adjusting the cutting angle of the cutting guide part relative to the nail surface to be cut. Through organic integration of the nail bed cutting part, the cutting guide part and the angle adjusting part, accurate adjustment of the angle of the cutting guide part relative to the nail surface is realized, so that two clinical modes of near-end beveling and far-end flat cutting are compatible on a single device.

Description

Technical Field

[0001] This invention relates to the field of canine bed cutting technology, and in particular to a canine bed cutter. Background Technology

[0002] The nail bed is located beneath the nail plate and is closely adjacent to the phalanges. In clinical nail surgery, to improve tissue survival rates, the current trend is to harvest the nail plate and the underlying nail bed tissue as a composite tissue flap. Different cutting techniques are required for different nail conditions. For example, in nail bed shortening repair surgery, the nail bed is often lengthened by a small-angle oblique incision and nail bed tissue flap repositioning, while in nail bed transplantation, a longitudinal horizontal incision is used to harvest the donor tissue flap.

[0003] However, there is currently a lack of specialized instruments in clinical practice that can accommodate both of these cutting modes. Existing cutting tools are mostly single-function designs, unable to flexibly switch between oblique and horizontal cutting modes on the same device. If the surgeon changes tools manually, it reduces the continuity of the surgery. Furthermore, current cutting tools rely entirely on personal experience to control the cutting process. Without cutting stroke guidance and angle and thickness fine-tuning mechanisms, the blade is prone to yaw or deflection, resulting in uneven tissue thickness and even damage to deep tissues, making it difficult to guarantee surgical outcomes.

[0004] Therefore, developing a specialized nail bed cutter that can achieve both small-angle oblique cuts and flat cuts, and has precise guidance and thickness and angle co-adjustment functions, is of vital importance for improving the safety and tissue survival rate of nail bed surgery. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a nail bed cutter that can achieve both small-angle oblique cutting and flat cutting, and has precise guidance and thickness and angle coordinated fine adjustment functions.

[0006] This invention provides a carapace cutter, comprising: Cutting section of the nail bed; A cutting guide is connected to the shell bed cutting part. The cutting guide includes a guide member and has a cutting guide channel. The shell bed cutting part moves along the cutting guide channel. An angle adjustment unit is connected to the cutting guide unit, and the angle adjustment unit adjusts the cutting angle of the cutting guide unit relative to the surface to be cut.

[0007] Preferably, the cutting guide further includes: The cutting limiter moves within the cutting guide and blocks the movement path of the cutting part of the A-bed in the cutting guide; A path adjustment component is connected to the cutting limit component, which locks or releases the cutting limit component relative to the cutting guide.

[0008] Preferably, it further includes a base portion, the base portion comprising: Adjustable base, connected to the cutting guide; and A thickness control component is connected to the adjustment base. The thickness control component adjusts the height of the adjustment base relative to the surface to be cut. The thickness control component includes a base and a lifting drive component. The lifting drive component is connected between the base and the adjustment base, and drives the adjustment base to rise and fall and locks it at a preset height.

[0009] Preferably, the cutting guide is rotatably connected to the adjusting base, and the angle adjusting part is connected between the adjusting base and the cutting guide. The angle adjusting part drives the cutting guide to rotate and locks it at a preset deflection angle.

[0010] Preferably, the angle adjustment part includes a second worm and a second worm wheel that mesh with each other. The second worm is rotatably connected to the cutting guide part, and the second worm wheel is fixed to the adjustment base. The central axis of the second worm wheel coincides with the rotation axis of the cutting guide part.

[0011] Preferably, the lifting drive component includes: Multiple lifting drive mechanisms are connected between the base and the adjusting base, and are symmetrically distributed at multiple points; A synchronous transmission mechanism drives multiple lifting drive mechanisms to lift synchronously. The self-locking drive mechanism is connected to one of the lifting drive mechanisms.

[0012] Preferably, each of the lifting drive mechanisms includes a threaded screw and a threaded sleeve, the threaded sleeve being rotatably connected to the base, the screw being fixed to the adjusting base, and the self-locking drive mechanism including a first worm and a first worm wheel that mesh with each other, the first worm being rotatably connected to the base, and the first worm wheel being coaxially fixed to one of the threaded sleeves.

[0013] Preferably, the shell bed cutting section includes: The slide plate moves along the cutting guide track; The cutting tool is connected to the sliding plate; An arc adjustment component, connected to the sliding plate, has an arc guide groove on its surface; and An arc locking element that adjusts and locks the curvature of the arc adjusting element.

[0014] Preferably, the shell bed cutting section further includes: The follower is rotatably connected to the cutting tool and rolls within the arcuate guide groove; Multiple tool position locking components are connected to the curvature adjustment component; A tool positioning component is provided on the tool, and it locks with the corresponding tool locking component when the tool slides to the corresponding position.

[0015] Preferably, it also includes a cutting window channel that passes through the base, the adjusting base and the cutting guide, and is disposed opposite to the surface to be cut.

[0016] The beneficial effects of the present invention in the above-mentioned solution implemented by the axle bed cutter include: 1. By organically integrating the nail bed cutting section, the cutting guide section, and the angle adjustment section, the precise adjustment of the angle of the cutting guide section relative to the nail surface is achieved, thus enabling both proximal oblique cutting and distal flat cutting to be compatible with a single device.

[0017] 2. By implementing precise path constraints on the cutting part of the A-bed through the cutting guide, the cutting operation risk is significantly reduced. At the same time, combined with the position-adjustable cutting limit component, the cutting stroke can be controlled and adjusted.

[0018] 3. By finely adjusting the height of the nail bed cutting section relative to the nail surface to be cut through the lifting drive mechanism, precise control of the tissue cutting thickness is achieved, enabling the acquisition of nail bed tissue flaps of different thicknesses according to clinical needs.

[0019] 4. The through-type cutting window provides the surgeon with a direct surgical view and also provides an unobstructed sliding channel for the cutting process of the nail bed tissue flap, effectively avoiding the compression and deformation of the nail bed tissue flap.

[0020] 5. The nail bed cutter can be adapted to the nail curvature of different patients by means of the curvature adjustment component. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 The diagram shown is a three-dimensional structural schematic diagram according to an embodiment of the present invention; Figure 2 The diagram shows a proximal oblique cut of the carapace cutting portion in an inclined state according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the distal end of the carapace cutting section in a horizontal state in one embodiment of the present invention; Figure 4 The diagram shown is an exploded view of the base portion according to an embodiment of the present invention. Figure 5 This is a structural diagram of the inner cavity of the base in one embodiment of the present invention; Figure 6 The diagram shown is an exploded view of the base and the lateral positioning member in one embodiment of the present invention. Figure 7 The diagram shown is an exploded view of the angle adjustment section in one embodiment of the present invention. Figure 8 The diagram shown is a partial structural diagram of the lifting drive mechanism in one embodiment of the present invention. Figure 9 The diagram shows a partial disassembled structural view of the guide rod and screw in one embodiment of the present invention. Figure 10 The diagram shown is a structural diagram of the cutting guide portion according to an embodiment of the present invention; Figure 11 The diagram shown is a structural diagram of the connection between the sliding plate and the cutting tool in one embodiment of the present invention; Figure 12 The diagram shows the structure of the tool and the tool locking member cooperating in one embodiment of the present invention; Figure 13 The diagram shows a detailed structural view of the tool positioning member and the tool locking member in one embodiment of the present invention. Figure 14 The diagram shows a detailed cross-sectional view of the connection point of the tool positioning component in one embodiment of the present invention. Figure 15 The diagram shown is a disassembled structural diagram of the follower and curvature adjustment component of the cutting tool in one embodiment of the present invention.

[0023] The following are component designations: 1. Cutting section of the apron; 11. Slide plate; 12. Cutting tool; 13. Curvature adjustment component; 14. Curvature locking component; 15. Tool position locking component; 16. Tool position positioning component; 17. Curvature guide groove; 18. Follower component; 2. Cutting guide section; 21. Cutting guide component; 22. Cutting guide channel; 23. Cutting limit component; 24. Path adjustment component; 25. Stroke indicator; 3. Angle adjustment part; 31. Second worm gear; 32. Second worm wheel; 33. Second operating part; 34. Angle marking component; 341. Angle scale; 342. Angle indicator component; 35. Connecting rod; 36. Groove block; 37. Arc groove; 4. Base section; 41. Adjustable base; 42. Base; 441. Lifting drive mechanism; 442. Screw; 443. Threaded sleeve; 445. Transmission belt; 451. Inner cavity; 446. Self-locking drive mechanism; 447. First worm gear; 448. First worm wheel; 449. First operating part; 46. ​​Thickness marking element; 461. Thickness indicator line; 462. Thickness indicator; 47. Guide rod; 471. Through hole; 472. Limiting ring; 5. Cutting window channel; 6. Lateral positioning component; 61. Elastic component. Detailed Implementation

[0024] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0029] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0030] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0031] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0032] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0033] First, it's important to clarify that the nail bed is located beneath the nail plate and closely adjacent to the phalanges. In clinical nail surgery, to improve tissue survival rates, the current trend is to harvest the nail plate and the underlying nail bed tissue as a composite tissue flap. Different cutting techniques are required for different nail conditions. For example, in nail bed shortening repair surgery, a small-angle oblique incision is needed. While preserving some tissue connections, the cut composite tissue flap is pushed distally (towards the fingertip) and re-sutured to lengthen the nail bed. In nail bed transplantation, a longitudinal horizontal incision is used to harvest a donor tissue flap for transplantation elsewhere. This invention can be applied to nail bed shortening repair surgery and nail bed transplantation, combining both proximal oblique incision and distal horizontal incision techniques in a single device.

[0034] like Figure 1 As shown, in one embodiment of the present invention, a canine bed cutter is structurally divided into a canine bed cutting section 1 for performing the cutting task, a cutting guide section 2 for providing trajectory constraints, and an angle adjustment section 3 for controlling the cutting angle. The cutting guide section 2 is connected to the canine bed cutting section 1, and the angle adjustment section 3 is connected to the cutting guide section 2 for adjusting the cutting angle of the cutting guide section 2 relative to the canine surface to be cut.

[0035] like Figure 1As shown, in one embodiment of the present invention, a base portion 4 is introduced to provide stable support for these mechanisms and establish a cutting reference. The base portion 4 may include an adjustable base 41 connected to the cutting guide portion 2, and a thickness control member connected to the adjustable base 41. The adjustable base 41 provides a stable assembly support platform for the entire device and establishes a horizontal reference for subsequent cutting operations.

[0036] like Figure 1 As shown, specifically, the cutting guide 2 is slidably connected to the cutting section 1 of the machine tool, while the angle adjustment section 3 is connected between the cutting guide 2 and the base section 4. This modular design ensures the rigidity of force transmission, allowing the cutting angle and depth of cut to be precisely adjusted separately.

[0037] like Figures 1-3 As shown, in one embodiment of the present invention, the thickness control member can precisely adjust the height of the adjustment base 41 relative to the surface to be cut, thereby changing the height position of the cutting part 1 of the nail bed.

[0038] like Figures 1-3 As shown, in one embodiment of the present invention, in order to improve the surgical field of vision, the device has through openings in the base 42, the adjusting base 41, and the cutting guide 2 to form a cutting window channel 5. This provides the surgeon with a direct surgical field of vision and also provides an unobstructed sliding and removal channel for the cutting process of the nail bed tissue flap, effectively avoiding the compression and deformation of the nail bed tissue flap.

[0039] like Figure 1 and Figure 10 As shown, the cutting guide 2 includes a guide member 21 with a cutting guide channel 22 along which the cutting section 1 of the machine tool moves. The cutting section 1 of the machine tool includes a slide plate 11 and a cutting tool 12. The side of the slide plate 11 may be provided with protrusions or grooves to form a stable sliding fit with the cutting guide channel 22. The cutting guide channel 22 can be a U-shaped groove, a T-shaped groove, or a dovetail groove, preferably a dovetail groove. This guiding mechanism solves the problems of tool yaw and bending of the cutting tool 12.

[0040] like Figure 1 and Figure 10 As shown, the stroke control mechanism may include a cutting limiter 23 that moves within the cutting guide 22, and a path adjuster 24 that has a locking function. The path adjuster 24 may be a snap-fit ​​pin, a fastening bolt, or other compatible fasteners, preferably a fastening bolt. A stroke indicator 25 is provided on the side of the cutting guide 2. The operator moves and locks the cutting limiter 23 according to the stroke indicator 25, thereby precisely controlling the feed stroke.

[0041] like Figure 1 and Figure 10As shown, for example, when the path adjustment component 24 is a fastening bolt, when the surgeon needs to change the cutting path length, first loosen the path adjustment component 24 to disengage it from the pressure contact with the wall of the guide component 21, thus releasing the locking state of the cutting limit component 23. Then, referring to the stroke marking 25 on the side of the guide component 21, the surgeon translates the cutting limit component 23 along the cutting guide path 22. When the cutting limit component 23 aligns with the target stroke value, the surgeon tightens the path adjustment component 24, locking the cutting limit component 23 onto the guide component 21, completing the path setting. It should be noted that a first friction-enhancing surface can be provided on the surface of the guide component 21 relative to the moving path of the path adjustment component 24. This first friction-enhancing surface can be a machined anti-slip texture, an adhesive rough surface, or other adaptive structures. The end of the path adjustment component 24 relative to the guide component 21 may also be provided with a second friction-increasing surface. The second friction-increasing surface may be a machined anti-slip texture, an adhesive rough surface, or other adaptive structure. The first friction-increasing surface and the second friction-increasing surface can improve the locking stability of the path adjustment component 24.

[0042] like Figure 10 As shown, when the path adjustment component 24 is a fastening bolt, a fine thread can be preferably used. This structure ensures that the path adjustment component 24 has excellent physical self-locking performance, so that the internal friction force it generates can counteract the torque that causes the bolt to rotate in the opposite direction. Therefore, the fastened path adjustment component 24 will not loosen due to the reciprocating impact or vibration of the slide plate 11, effectively preventing accidental injury from tool overshoot caused by stroke loss control, avoiding accidental injury to deep important nerves, blood vessels or finger bones, and ensuring the safe closed loop of the operation.

[0043] like Figures 1-5 As shown, in one embodiment of the present invention, for fine adjustment in the thickness direction, the thickness control component may specifically include a base 42 and a lifting drive component. With the base 42 conforming to the finger circumference, the lifting drive component drives the adjusting base 41 to rise and fall vertically, thereby changing the height position of the nail bed cutting portion 1 relative to the nail surface to be cut, i.e., changing the thickness of the nail bed tissue flap to be cut.

[0044] like Figures 4-6 As shown, in one embodiment of the present invention, in order to improve the balance during the lifting process, the lifting drive component adopts a multi-point synchronous drive structure, which may include multiple lifting drive mechanisms 441 symmetrically distributed on the base 42, a synchronous transmission mechanism, and a self-locking drive mechanism 446 connected thereto. The above-mentioned symmetrical connection structure can largely eliminate the left and right tilting of the adjusting base 41 during the lifting process, providing a physical basis for high-quality flat cutting.

[0045] like Figure 8As shown, in one embodiment of the present invention, the self-locking drive mechanism 446 may employ a first worm gear 447 and a first worm wheel 448 that mesh with each other. The first worm gear 447 is rotatably connected to a bearing seat fixed inside the base 42, and one end of it passes through the base 42 and is connected to a first operating part 449. The first operating part 449 may specifically be a handwheel, a knob, or a handle, preferably a handwheel.

[0046] like Figure 4 and Figure 8 As shown, further, each lifting drive mechanism 441 may include a screw 442 and a threaded sleeve 443 that are threadedly connected to each other, wherein the threaded sleeve 443 is rotatably connected to the base 42, and the screw 442 is fixed to the adjusting base 41. The synchronous transmission mechanism may specifically include a transmission component that meshes with the toothed surfaces of the threaded sleeve 443. This transmission component may be a chain, a gear set, or a synchronous transmission belt, preferably a transmission belt 445. The transmission belt 445 can synchronously distribute power to the four threaded sleeves 443. Through the mechanical linkage of the transmission belt 445, synchronous lifting at the four corners is achieved.

[0047] like Figures 4-5 As shown, specifically, the top surface of the base 42 may be provided with an inner cavity 451, and an inner cavity plate is fixedly covered thereon, so that the inner cavity 451 forms a relatively closed accommodating space for encapsulating complex transmission components. It can hide mechanisms such as the first worm 447, the first worm wheel 448, the threaded sleeve 443, the transmission belt 445, and the screw 442. The screw 442 passes through the inner cavity plate of the base 42 to achieve lifting and lowering, making full use of the space of the base 42 and improving the integration of the jaw bed cutter.

[0048] like Figures 4-6 and Figure 8As shown, when using this nail bed cutter, the operator rotates the first operating part 449, causing the first worm gear 447 to rotate synchronously, which in turn drives the first worm wheel 448 and a threaded sleeve 443 coaxially fixed to it to rotate. At this time, through the transmission belt 445, the power of the threaded sleeve 443 coaxially fixed to the first worm wheel 448 is synchronously distributed to the other three threaded sleeves 443, causing multiple threaded sleeves 443 to rotate synchronously. The rotational motion is converted into the synchronous linear lifting and lowering of the four screws 442, thereby pushing the adjusting base 41 to change its height relative to the base 42. Based on the self-locking physical characteristics between the first worm gear 447 and the first worm wheel 448, the operator's rotation of the first operating part 449 is efficiently converted into vertical displacement compensation. When the operation stops, the first worm gear 447 and the first worm wheel 448 immediately and automatically lock, and the vertical displacement of the adjusting base 41 is also automatically locked. Furthermore, even if surgical vibration occurs during the cutting process, the first worm 447 and the first worm wheel 448 can remain locked and stable, which greatly reduces the risk of cutting depth drift and some accidental damage caused by external force interference from a physical perspective.

[0049] like Figures 1-3 As shown, to make the thickness adjustment visible, a thickness indicator 46 can be provided on the side of the adjustment base 41. The thickness indicator 46 may include a thickness indicator line 461 provided on the outer wall of the base 42, and a thickness indicator 462 fixed to the edge of the adjustment base 41. When the nail bed cutter is adjusting the thickness, the spatial position of the base 42 is fixed, while the adjustment base 41 moves vertically up and down under the drive of the screw 442, thereby causing the thickness indicator 462 to move synchronously and linearly. By observing the direction of the thickness indicator 462 on the thickness indicator line 461, the operator can accurately capture the slight height change of the adjustment base 41 relative to the base 42 through the relative displacement of the thickness indicator 462 and the thickness indicator line 461, that is, the change in the thickness position of the cutter 12 of the nail bed cutter relative to the nail surface to be cut. Thus, the operator can achieve precise control of the cutting thickness.

[0050] like Figure 4 , Figure 6 and Figure 9 As shown, four guide rods 47 are fixedly connected to the bottom of the adjusting base 41, and slide in the through holes 471 inside the base 42. The position of the four guide rods 47 limits the adjusting base 41 to only perform vertical displacement. The guide rods 47 can be made of alloy steel, composite rods, or stainless steel, preferably high-strength stainless steel rods.

[0051] Furthermore, based on actual movement requirements, ball bearings can also be installed in the through hole 471. When the outer peripheral wall of the guide rod 47 slides through the inner peripheral wall of the through hole 471, the ball bearings convert sliding friction into rolling friction, reducing adjustment resistance and making the fine-tuning process smoother. The ball bearings can be ceramic balls, wear-resistant composite balls, or precision steel balls, preferably precision steel balls.

[0052] like Figure 4 , Figure 6 and Figure 9 As shown, a limit ring 472 can be connected to the bottom end of the guide rod 47. Its radial dimension can be larger than the inner diameter of the through hole 471, used to limit the stroke of the lifting displacement, preventing the adjusting base 41 from dislodging, and also limiting the vertical lifting distance of the screw 442. Regarding the structure of the limit ring 472, it can be a retaining ring, an elastic retaining ring, or other compatible structures; preferably, it is a retaining ring fixed to the bottom end of the guide rod 47.

[0053] like Figures 1-3 As shown, the cutting guide 2 and the adjusting base 41 are rotatably connected by a rotating shaft, and the angle adjusting part 3 can be connected between the cutting guide 2 and the adjusting base 41 to adjust the angle of the cutting guide 2.

[0054] like Figure 2 and Figure 7 As shown, specifically, the angle adjustment unit 3 may include a second worm 31 and a second worm wheel 32 that mesh with each other. The second worm 31 may be connected to the cutting guide unit 2, and the second worm wheel 32 may be fixed on the adjustment base 41 so that when the second worm 31 rotates, it can crawl along the surface of the second worm wheel 32, thereby driving the cutting guide unit 2 to deflect around its rotation axis.

[0055] like Figure 2 , Figure 3 and Figure 7As shown, further, one end of the second worm 31 is connected to a second operating part 33. The second operating part 33 can be a disc-shaped knob, a rotary handle, or a knob with knurled texture. The position of the second operating part 33 can be rotatably connected to the cutting guide 2, moving in tandem with the cutting guide 2, and rotating itself on the cutting guide 2. When the operator needs to adjust the angle of the cutting guide 2, they rotate the second operating part 33, thereby driving the second worm 31 to rotate. When the second worm 31 rotates, it can crawl along the surface of the second worm wheel 32, thereby driving the cutting guide 2 to deflect around its rotation axis, thus adjusting the angle of the cutting guide 2 relative to the nail surface to be cut. When a flat cut is required, the angle of the cutting guide 2 relative to the nail surface to be cut is adjusted to be horizontal, so that the angle of the nail bed cutting part 1 relative to the nail surface to be cut is horizontal. At this time, pushing the nail bed cutting part 1 to move on the cutting guide 2 can achieve a longitudinal flat cut. When a beveling is required, the angle between the cutting guide 2 and the surface to be cut is adjusted to be, for example, 10 degrees, so that the angle between the cutting bed cutting part 1 and the surface to be cut is 10 degrees. At this time, the cutting bed cutting part 1 is pushed to move on the cutting guide 2 to achieve a proximal beveling.

[0056] like Figure 2 , Figure 3 and Figure 7 As shown, to ensure the accuracy of the deflection path of the cutting guide 2, a connecting rod 35 and a closed arc-shaped groove 37 are also provided to limit the deflection path. Specifically, the arc-shaped groove 37 can be part of a circle, and this circle can coincide with the central axis of the second worm gear 32. A connecting rod 35 can be fixed to the bottom end of the cutting guide 2, and a groove block 36 can be connected to the connecting rod 35. The groove block 36 can slide adaptably in the arc-shaped groove 37 so that the sliding distance of the connecting rod 35 is limited. When the cutting guide 2 generates a deflection angle adjustment, it drives the connecting rod 35 to rotate, thereby driving the groove block 36 to slide in the arc-shaped groove 37. The groove block 36 reaches the rotation angle limit when it abuts against both ends of the arc-shaped groove 37.

[0057] like Figure 3 and Figure 7 As shown, it should be explained that the central axis of the second worm gear 32 coincides with the rotation axis of the cutting guide 2. When the second worm 31 crawls on the second worm gear 32, it drives the cutting guide 2 to deflect around its rotation axis. This structural design ensures that the meshing clearance of the second worm 31 remains constant throughout its entire stroke, preventing jamming. Furthermore, the second worm gear 32 can be configured as a partially sector-shaped worm gear based on the actual crawling stroke of the second worm 31, thereby reducing the structural space occupied by the second worm gear 32 in the entire machine tool cutter.

[0058] like Figure 2 and Figure 3As shown, to improve the intuitiveness of adjustment, the device also includes an angle marker 34. The angle marker 34 may include an angle dial 341 fixed to the adjustment base 41, and an angle indicator 342 fixed to the rotation shaft of the cutting guide 2. The angle indicator 342 points to a certain angle on the angle dial 341. As the cutting guide 2 rotates, the angle indicator 342 on its rotation shaft deflects on the angle dial 341, allowing the operator to accurately obtain the current deflection angle value of the cutting guide 2 relative to the surface to be cut. This structure transforms complex spatial angle adjustments into intuitive degree feedback, ensuring that the operator can accurately adjust the beveling angle when performing beveling. The angle dial 341 may be a laser-etched scale, a silkscreened scale, or a raised thickness indicator line integrally formed with the adjustment base 41; laser-etched scales are preferred.

[0059] like Figure 2 and Figure 6 As shown, lateral positioning elements 6 can also be provided on both sides of the interior of the base 42. These can be retractable arc-shaped baffles, retractable clamping arms, or retractable frame structures. An elastic element 61 can be connected between the lateral positioning element 6 and the interior of the base 42, so that the two lateral positioning elements 6 can automatically generate an adaptive clamping force according to the thickness of the patient's finger, preventing the affected limb from shifting during cutting and creating a stable operating platform. During operation, the operator places the patient's finger on the support plane, clamps the nail bed cutter at a suitable position on the patient's finger, and the lateral positioning elements 6 clamp the sides of the finger, forming a stable operating platform.

[0060] like Figure 1 and Figure 13 As shown, the nail bed cutting section 1, responsible for performing the cutting task, adopts a modular design and is adapted to the curvature of the nail. The cutting tool 12, as a consumable that directly contacts the tissue, can be a detachable, separate structure. That is, the cutting tool 12 consists of a blade holder connected at the rear end and a cutting blade at the front end. The blade can be fixed to the blade holder by fastening bolts, pins, snap-fit ​​structures, or other fixing structures. Its detachability ensures convenient blade replacement after surgery. In particular, the tip of the cutting tool 12 can be designed with a certain curvature, which better matches the physiological convex curvature of the nail surface, greatly reducing the problem of lateral suspension that may occur when a straight blade cuts the convex surface of the nail, ensuring that the thickness of the harvested tissue flap is uniform.

[0061] like Figure 10 , Figure 11 and Figure 15As shown, to better adapt the curved blade 12 to the overall curvature differences of different patients' nails, the nail bed cutting section 1 also incorporates a curvature adjustment mechanism to accommodate different nail curvatures. Specifically, a curved strip-shaped curvature adjustment member 13 can be provided above the slide plate 11, and a curvature locking member 14 can be connected to the slide plate 11. This locking member acts on the center position of the curvature adjustment member 13 to adjust and lock the curvature of the curvature adjustment member 13. Furthermore, a curvature guide groove 17 extending through the surface of the curvature adjustment member 13 can be provided, allowing the blade 12 to slide and change position along the curvature guide groove 17. When the curvature of the curvature adjustment member 13 changes, the curvature of the sliding path of the blade 12 also changes accordingly, thus adapting to different nail curvatures.

[0062] like Figure 10 and Figure 11 As shown, it should be noted that the arc locking member 14 can preferably be an adjusting bolt with fine thread to improve locking stability. When the target arc is adjusted and rotation stops, the arc locking member 14 can directly rely on the physical self-locking characteristics of the thread to firmly maintain and lock the current curvature of the arc adjusting member 13.

[0063] like Figure 10 As shown, in a specific connection, a support frame that extends upwards can be fixedly provided in the middle of the slide plate 11. The arc locking member 14 can be threadedly connected to the top of the support frame, and the bottom end of the arc locking member 14 can abut against the center position of the arc adjusting member 13. When the operator rotates the arc locking member 14 in different directions, it generates a vertical lifting displacement on the support frame, thereby forcing the elastic arc adjusting member 13 to produce a corresponding bending deformation to adapt to different nail arcs.

[0064] It should be noted that, in order to ensure the realization of bidirectional curvature adjustment, the curvature adjustment component 13 is preferably made of a material with a certain elastic recovery capability, such as high-strength spring steel, medical-grade elastic alloy or other matching materials, so that it constitutes a leaf spring with self-rebound characteristics. When the surgeon rotates the curvature locking component 14 downward to press down, the curvature adjustment component 13 is forced to produce downward bending deformation and accumulate elastic potential energy inside it. When the surgeon rotates the curvature locking component 14 upward, the curvature adjustment component 13 will automatically bounce upward due to its inherent material rebound force, and its center point will always be tightly pressed against the bottom end of the curvature locking component 14.

[0065] like Figure 10 and Figure 11As shown, to prevent the curvature adjustment component 13 from jamming at both ends when its curvature changes due to compression or tension at the center, guide sliders can be connected to the bottom of both ends of the curvature adjustment component 13, while corresponding limiting grooves can be formed at both ends of the slide plate 11. When the curvature of the curvature adjustment component 13 changes, the guide sliders at both ends can slide within the limiting grooves, thereby releasing the internal stress generated by bending deformation and ensuring that the highest point of the center is always absolutely centered and the curve transitions smoothly. The length of the limiting groove can be adaptively designed based on the required movement distance at both ends of the curvature adjustment component 13.

[0066] like Figure 11 and Figure 15 As shown, to ensure the nail slides normally within the curvature adjustment member 13, a follower member 18 is rotatably connected to the blade holder of the blade 12. The follower member 18 is preferably a rolling member. The follower member 18 can be embedded in and roll within the curvature guide groove 17 on the curvature adjustment member 13. When the operator pushes the blade 12 to slide within the curvature adjustment member 13 to change its lateral position, the follower member 18 rolls within the curvature guide groove 17, cleverly converting the lateral translation into movement along a predetermined arc, allowing the blade 12 to cut at different positions on the nail surface to be cut.

[0067] like Figures 12-14 As shown, to achieve rapid and precise locking of the blade's lateral position, multiple blade locking components 15 are connected to the curvature adjustment component 13, such as pressure plates with positioning grooves. Simultaneously, a blade positioning component 16, such as an elastic positioning bead, can be provided on the blade holder of the blade 12. For example, when the surgeon pushes the blade 12 laterally to the corresponding nail position with a certain force, the elastic positioning bead will engage with the positioning groove of the corresponding pressure plate based on the spring force, achieving rapid and accurate locking. When the blade 12 is pushed again to slide away from the current pressure plate with a certain force, the spring connected to the elastic positioning bead is compressed, causing the elastic positioning bead to compress, and the pressure plate can then disengage from the elastic positioning bead. Of course, the blade locking component 15 and the blade positioning component 16 can also be designed with other structures that can be quickly locked; specific modifications can be made according to actual needs.

[0068] like Figures 1-3 The specific operating procedure for this nail bed cutter in clinical use is as follows: When performing a distal lateral cut: The operator clamps the nail bed cutter onto the patient's finger, ensuring the blade 12 aligns with the fingertip. The two lateral positioning members 6 automatically generate an adaptive clamping force based on the patient's finger thickness. The operator then observes the lateral curvature of the patient's nail and rotates the curvature locking member 14 to alter the bending deformation of the curvature adjusting member 13 until its curvature closely matches the nail surface to be cut. Then, referring to the angle indicator 342, the operator adjusts and locks the cutting guide 2 to a horizontal position. Furthermore, referring to the stroke indicator 25, the operator locks the cutting limit member 23. Next, the operator rotates the first operating part 449 and finely adjusts the cutting height referring to the thickness indicator 46. Once ready, the operator first slides the blade 12 laterally, causing the follower 18 to roll within the curvature guide groove 17 to the first target nail cutting position (e.g., the left side of the nail). At this point, the blade positioning member 16 automatically engages with the corresponding blade locking member 15 under elastic force, providing tactile feedback and achieving lateral locking. Next, the surgeon advances the nail bed cutting section 1. When the slide plate 11 hits the cutting limiter 23 and produces a clear stopping sensation, it indicates that a segment of nail bed tissue with uniform thickness in that area has been cut off. If the cutting width does not cover the entire lesion area, the surgeon can unlock the current position, allowing the blade 12 to slide and relock to the next nail cutting position (e.g., the middle section of the nail or the right side of the nail), repeating the pushing action to complete a precise, multi-stage flat cut of the entire nail bed.

[0069] When performing a proximal oblique incision: The surgeon clamps the nail bed cutter onto the patient's finger, positioning the blade 12 close to the nail root. First, referring to the angle indicator 342, the surgeon adjusts and locks the cutting guide 2 to a preset angle (e.g., 10 degrees), and refers to the travel indicator 25 to lock the cutting limiter 23. Next, the surgeon rotates the first operating part 449, adjusting the height with reference to the thickness indicator 46. Then, the surgeon slides the blade 12, causing the follower 18 to move along the arc guide groove 17 to the target oblique incision position, such as the middle of the nail, where it is locked by the blade position positioning member 16 and the corresponding blade position locking member 15. Subsequently, the surgeon pushes the nail bed cutting part 1 to guide the blade 12 to cut at a preset angle. When the slide plate 11 strikes the cutting limiter 23, creating a clear stopping sensation, it indicates that the oblique incision at that position has been precisely completed, and the tissue can then be pushed away at this incision location. If it is necessary to extend the width of the oblique incision, simply switch the locking position of the blade 12 laterally and push it in again.

[0070] In summary, the nail bed cutter provided by this invention firstly achieves precise adjustment of the angle between the cutting guide and the nail surface through the organic integration of the nail bed cutting part, the cutting guide part, and the angle adjustment part, thus enabling both proximal oblique cutting and distal flat cutting in a single device. The precise path constraint of the nail bed cutting part by the cutting guide significantly reduces the risk of cutting operations. Simultaneously, the adjustable cutting limiter allows for control and adjustment of the cutting stroke. The lifting drive mechanism fine-tunes the height of the nail bed cutting part relative to the nail surface to be cut, achieving precise control of the tissue cutting thickness and enabling the acquisition of nail bed tissue flaps of different thicknesses according to clinical needs. The through-type cutting window provides the surgeon with a direct surgical view and an unobstructed sliding channel for the nail bed tissue flap during cutting, effectively preventing compression and deformation of the nail bed tissue flap. Finally, the curvature adjustment component allows the nail bed cutter to adapt to the nail curvature of different patients. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A bed cutter, characterized in that, include: Cutting section of the nail bed; A cutting guide is connected to the shell bed cutting part. The cutting guide includes a guide member and has a cutting guide channel. The shell bed cutting part moves along the cutting guide channel. An angle adjustment unit is connected to the cutting guide unit, and the angle adjustment unit adjusts the cutting angle of the cutting guide unit relative to the surface to be cut.

2. The axle bed cutter according to claim 1, characterized in that, The cutting guide also includes: The cutting limiter moves within the cutting guide and blocks the movement path of the cutting part of the A-bed in the cutting guide; A path adjustment component is connected to the cutting limit component, which locks or releases the cutting limit component relative to the cutting guide.

3. The axle bed cutter according to claim 1, characterized in that, It also includes a base portion, the base portion comprising: Adjustable base, connected to the cutting guide; and A thickness control component is connected to the adjustment base. The thickness control component adjusts the height of the adjustment base relative to the surface to be cut. The thickness control component includes a base and a lifting drive component. The lifting drive component is connected between the base and the adjustment base, and drives the adjustment base to rise and fall and locks it at a preset height.

4. The axle bed cutter according to claim 3, characterized in that, The cutting guide is rotatably connected to the adjusting base, and the angle adjusting part is connected between the adjusting base and the cutting guide. The angle adjusting part drives the cutting guide to rotate and locks it at a preset deflection angle.

5. The axle bed cutter according to claim 4, characterized in that, The angle adjustment part includes a second worm and a second worm wheel that mesh with each other. The second worm is rotatably connected to the cutting guide part, and the second worm wheel is fixed to the adjustment base. The central axis of the second worm wheel coincides with the rotation axis of the cutting guide part.

6. The axle bed cutter according to claim 3, characterized in that, The lifting drive component includes: Multiple lifting drive mechanisms are connected between the base and the adjusting base, and are symmetrically distributed at multiple points; A synchronous transmission mechanism drives multiple lifting drive mechanisms to lift synchronously. The self-locking drive mechanism is connected to one of the lifting drive mechanisms.

7. The axle bed cutter according to claim 6, characterized in that, Each of the lifting drive mechanisms includes a threaded screw and a threaded sleeve, the threaded sleeve being rotatably connected to the base, and the screw being fixed to the adjusting base. The self-locking drive mechanism includes a first worm and a first worm wheel that mesh with each other, the first worm being rotatably connected to the base, and the first worm wheel being coaxially fixed to one of the threaded sleeves.

8. The axle bed cutter according to claim 1, characterized in that, The shell bed cutting section includes: The slide plate moves along the cutting guide track; The cutting tool is connected to the sliding plate; An arc adjustment component, connected to the sliding plate, has an arc guide groove on its surface; and An arc locking element that adjusts and locks the curvature of the arc adjusting element.

9. The axle bed cutter according to claim 8, characterized in that, The cutting section of the armor bed also includes: The follower is rotatably connected to the cutting tool and rolls within the arcuate guide groove; Multiple tool position locking components are connected to the curvature adjustment component; A tool positioning component is provided on the tool, and it locks with the corresponding tool locking component when the tool slides to the corresponding position.

10. The axle bed cutter according to claim 3, characterized in that, It also includes a cutting window channel that runs through the base, the adjusting base and the cutting guide, and is positioned opposite to the surface to be cut.

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