A knife for limb tube sheath stenosis and fascia ligament release

Abstract

This utility model relates to a cutting tool for limb stenosis and fascioligament release surgery, comprising a shank and a blade. The proximal end of the shank has an adapter for mounting and holding it to an arthroscope, and the distal end of the shank has the blade. The distal region of the shank has a cutting section with a first cutting edge and a second cutting edge, wherein the first and second cutting edges have different cutting directions. The first cutting edge, when the shank is driven forward to advance the cutting section, cuts through the tissue structure it encounters with with its cutting edge acting in the advancing direction of the shank; the second cutting edge, when the shank is driven backward to retract the cutting section, cuts through the tissue structure it encounters with with its cutting edge acting in the retracting direction of the shank. This cutting tool, by mounting the tissue-cutting tool onto an arthroscope, allows surgeons to use a single-incision technique to conveniently and effectively release limb stenosis and tense fascioligaments under arthroscopic visualization.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a tool for releasing stenosis of fibrous sheaths, tension of fascia, and release of thickened ligaments in the limbs. Background Technology

[0002] Inflammation and injury of the intraluminal tissues caused by fibrous tendon sheath stenosis is a common orthopedic condition, mainly including stenosing tenosynovitis of the flexor tendons, carpal tunnel syndrome, ulnar tunnel syndrome, radial styloid tenosynovitis, and tarsal tunnel syndrome. Repeated friction and compression of the tendons within the tendon sheath during daily life and work can lead to repeated inflammation, hyperplasia, and narrowing of the tendon sheath surrounding the tendon, resulting in restricted tendon movement, pain, or nerve damage within the sheath. Traditional treatments include physical therapy, medication, and surgery. While physical therapy can help relieve pain and improve the inflammatory environment within the sheath, its effectiveness is limited for severe stenosing tendon sheath stenosis. Medication, such as nonsteroidal anti-inflammatory drugs (NSAIDs), can reduce inflammation and pain, but long-term use may cause side effects and cannot resolve the structural stenosis within the sheath. Surgical treatment, particularly traditional procedures, requires a large incision to fully expose the tendon sheath and restore normal movement space for the compressed tendon or nerve, but this involves significant trauma.

[0003] With the widespread application of arthroscopic minimally invasive surgery, endoscopic release of stenotic fibrous sheaths in the limbs has gradually become a focus of research and development in recent years. CN222150100U discloses a tendon sheath release device for endoscopic-assisted tendon sheath release surgery. This device provides space for the endoscope and cutting tool by having a channel groove that can be inserted into the skin and enter the subcutaneous tissue, thus solving the problem of the lack of a sheath that can accurately guide the endoscope and cutting tool to the designated position in clinical tendon sheath release techniques. However, this device has shortcomings in terms of precise control during the cutting process. Medical staff find it difficult to flexibly adjust the position of the cutting tool according to actual needs, resulting in a lack of sufficient precision during the operation. It is difficult to achieve precise approach or distance from the target tissue through simple operation, thus increasing the cutting difficulty of the surgery.

[0004] Furthermore, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making this utility model, but due to space limitations, not all details and contents were listed in detail. However, this does not mean that this utility model does not have the features of these prior art. On the contrary, this utility model has all the features of the prior art, and the applicant reserves the right to add relevant prior art to the background art. Utility Model Content

[0005] In view of the shortcomings of the prior art, this application proposes a tool for releasing stenosis of fibrous sheaths of the limbs, releasing tense fascia and thickened ligaments, aiming to solve one or more technical problems in the prior art.

[0006] This utility model relates to a knife for releasing stenosis of fibrous sheaths, tense fascia, and thickened ligaments in the limbs. It includes a shank and a blade. The proximal end of the shank has an adapter for mounting and holding it to an arthroscope. The distal end of the shank has the blade. The distal region of the shank has a cutting section with a first cutting edge and a second cutting edge. The first and second cutting edges have different cutting directions. The first cutting edge can cut through the tissue structure it encounters when the shank is driven forward to advance the cutting section, with its cutting edge acting in the advancing direction of the shank. The second cutting edge can cut through the tissue structure it encounters when the shank is driven backward to retract the cutting section, with its cutting edge acting in the retracting direction of the shank.

[0007] By configuring a bidirectional cutting design, the blade of this invention can effectively cut in both forward and backward driving directions. This bidirectional cutting function improves the flexibility and efficiency of surgery, reducing the need for multiple adjustments or repositioning that might occur with unidirectional cutting tools. Medical personnel can precisely cut the target tissue during both forward and backward movements, based on the tissue characteristics of the sheaths and tendons and the needs of the surgery, avoiding excessive or insufficient cutting operations, thereby reducing damage to surrounding normal tissues and improving surgical safety. Furthermore, by mounting the blade for cutting tissue onto the arthroscopy, medical personnel are allowed to use a single-incision technique, conveniently and effectively performing release surgery on stenotic sheaths and tendons in the limbs with the assistance of the arthroscopic view.

[0008] According to a preferred embodiment, the cutting section is a plate-like component that protrudes transversely to the scalpel. This plate-like component is fixed to the scalpel by one side edge, while its other edge forms a first cutting edge and a second cutting edge, respectively. The transverse protrusion design creates an angle between the plate-like component and the scalpel, facilitating cutting operations in confined or complex anatomical areas. The transverse angle provided by the plate-like component helps overcome spatial limitations, allowing for more precise access to the target tissue. Fixed to the scalpel by one side edge, the plate-like component effectively withstands the mechanical forces during cutting while maintaining the fixed position and angle of the cutting section. This design reduces the risk of decreased cutting accuracy due to vibration or displacement. The design of the first and second cutting edges gives the cutting section a dual cutting function. During surgery, the surgeon can choose to use the cutting edge in different directions as needed, thereby achieving flexible cutting operations and improving surgical efficiency and adaptability.

[0009] According to a preferred embodiment, the cutting section extends beyond the outer wall of the cannula used to attach the arthroscopic endplate at its distal end, transverse to the scalpel. This design, extending beyond the cannula's outer wall, allows for operation over a wider area, unrestricted by the cannula's boundaries. This provides surgeons with greater freedom to adjust the position and angle of the cutting section during surgery, thereby covering a larger surgical area and improving surgical efficiency.

[0010] According to a preferred embodiment, a strip extending along the axial direction of the scalpel is formed at the distal end of the scalpel shaft, and the cutting section is fixed to the side of the strip facing the arthroscope. The strip extending along the axial direction of the scalpel shaft provides additional support and stability to the cutting section. This design effectively resists axial and lateral forces applied during surgery, reducing vibration or displacement of the cutting section, thereby improving cutting accuracy and reliability. Furthermore, the position of the cutting section close to the arthroscope shaft minimizes obstruction of the field of vision during cutting operations, ensuring that the surgeon can clearly observe the surgical area through the arthroscope, improving surgical visibility and safety.

[0011] According to a preferred embodiment, a plate-like component is fixed to the scalpel shank in an integral molding, shape-interlocking, welding, or bonding manner to form the cutting section. The plate-like component is polygonal, a polygon with one curved edge, or an arcuate ridge with a hyperbolic curved top surface. The plate-like component serving as the cutting section has reflective textures, reflective elements, fluorescent coating, or active light-emitting elements on at least one side. This diverse shape design combines the advantages of straight and curved cutting to adapt to different tissue types and cutting needs; it also provides a larger cutting surface area and smoother cutting motion, reducing tissue damage. Furthermore, by configuring reflective textures, reflective elements, and coating with fluorescent or active light-emitting elements, the plate-like component can form a significantly higher contrast marker in the 300° field of view of the arthroscope, thereby achieving rapid positioning using reflective or active light-emitting features, improving cutting accuracy and surgical efficiency.

[0012] According to a preferred embodiment, when the plate-like component is triangular in shape, its first edge facing the blade shank is fixed to the blade shank, its second edge pointing towards the distal end of the blade shank axially forms a first cutting edge, and its third edge facing away from the distal end of the blade shank axially forms a second cutting edge. The second edge forming the first cutting edge, pointing towards the distal end of the blade shank axially; and the third edge forming the second cutting edge, facing away from the distal end of the blade shank axially, this design enables a single tool to have bidirectional cutting capabilities, greatly enhancing the tool's versatility and flexibility. Medical personnel can select the appropriate cutting edge according to the needs of the surgery, eliminating the need for frequent tool changes.

[0013] According to a preferred embodiment, the scalpel is rotatably held to the arthroscope body via an adapter, wherein the arthroscope and the adapter are rotatably fixed to each other in a locked state, while the scalpel can rotate around the arthroscope body relative to the arthroscope and the adapter, which are rotatably fixed to each other. The scalpel can rotate around the arthroscope body while the arthroscope and the adapter remain relatively fixed. This design greatly increases the flexibility of surgical operations, allowing the surgeon to adjust the angle of the scalpel without moving the entire arthroscope, enabling the tool to better adapt to various complex anatomical structures and surgical angles, and enhancing its applicability in various minimally invasive surgeries.

[0014] According to a preferred embodiment, a friction engagement is present between the proximal end of the scalpel and the distal end of the adapter to generate frictional force. This friction engagement provides resistance in the direction of rotation as the scalpel rotates around the arthroscopy body. The friction engagement provides adequate resistance, allowing medical personnel to more reliably control the rotation of the scalpel. This resistance prevents accidental rotation of the scalpel due to inertia or external forces during operation, thereby improving surgical precision. Furthermore, appropriate frictional resistance helps maintain the stability of the scalpel during rotation, reducing vibration or unnecessary movement.

[0015] According to a preferred embodiment, when the scalpel is held in arthroscopy for release surgery of stenotic canal sheath or tenosynovitis, the scalpel enters the site requiring release surgery along a pre-formed channel between the deep fascia and the canal / tendon sheath. During the entry of the scalpel along the channel, the scalpel can be in a first rotational position without cutting, so that the cutting edge thereon is away from the tissue structure. When the scalpel reaches the site requiring release surgery via the channel, the scalpel can be in a second rotational position for cutting, so that the cutting edge thereon faces the tissue structure of the release surgery site.

[0016] The scalpel holder enters the channel in a first, non-cutting rotational position, with the cutting edge far from the tissue structure, effectively preventing accidental damage to healthy tissue as it approaches the surgical site. This design reduces the risk of intraoperative complications, providing greater safety for the patient. Once the scalpel holder reaches the target area, it is adjusted to a second rotational position, aligning the cutting edge with the tissue requiring release for precise cutting. This precision helps to release only the lesion site, preserving surrounding healthy tissue.

[0017] According to a preferred embodiment, the scalpel shaft encircles the arthroscopy body proximally but allows the arthroscopy lens to be exposed, such that as the scalpel shaft reaches the site requiring release surgery via this channel, the image captured by the lens includes the second cutting edge of the cutting section and the thickened tendon sheath tissue in contact with the cutting section. The arthroscopic lens can simultaneously capture the second cutting edge of the cutting section and the contacting thickened tendon sheath tissue, providing real-time visualization of the surgical procedure. This direct observation method greatly improves the accuracy and safety of the surgery. The surgeon can directly observe the contact between the cutting edge and the target tissue, thereby more precisely controlling the depth and extent of the cut. This precise control helps to avoid accidental damage to surrounding healthy tissues. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the preferred overall structure of the cutting tool provided by this utility model; Figure 2 This is an axial sectional view of the preferred adapter area during assembly provided by this utility model; Figure 3 This is a cross-sectional view of the preferred adapter area provided by this utility model; Figure 4 This is an exploded view of the preferred adapter area provided by this utility model when it is not assembled; Figure 5 This is an enlarged view of the preferred cutter head area provided by this utility model; Figure 6 This is a schematic diagram of various preferred forms of the cutting portion provided by this utility model; Figure 7 This is a cross-sectional schematic diagram of the preferred linear cutting part provided by this utility model in the first rotational position within the channel; Figure 8 This is a cross-sectional schematic diagram of the preferred linear cutting part provided by this utility model in the second rotational position within the channel; Figure 9 This is a cross-sectional schematic diagram of the preferred cutting section provided by this utility model cutting within the channel; Figure 10 This is an axial sectional view showing the preferred positional relationship between the blade and the shank and the anatomical structure of the finger provided by this utility model.

[0019] List of reference numerals 100: Blade holder; 110: Adapter; 111: First retaining sleeve; 112: Retaining ring; 113: Second retaining sleeve; 114: Friction mating part; 200: Blade head; 210: Cutting part; 211: First cutting edge; 212: Second cutting edge; 220: Strip-shaped part; 230: Arc-shaped push-cutting blade; 240: Hook-cutting blade; 250: Wire guide; 270: Pointed-edge push-cutting blade; 300: Arthroscopy; 310: Lens envelope; 400: Groove plate. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] Terminology definition: "outer wall of the cannula" refers to the outer wall of the tubular structure provided at the proximal end of the shank 100. The shank 100 is sleeved on the outside of the arthroscope 300 by means of this tubular structure so that the extension direction of its distal end is consistent with the axis of the shank 100.

[0022] Position definition: During a stenosing tenosynovitis release surgery, the end of the scalpel closer to the medical staff is the proximal end, and the end farther away from the medical staff is the distal end.

[0023] like Figure 1 As shown, the cutting tool includes a shank 100 and a cutting head 200. The proximal end of the shank 100 has an adapter 110 for securely mounting the tool to the arthroscope 300. The adapter 110 can employ a threaded or snap-fit ​​connection structure, allowing the shank 100 to be detachably fixed to the arthroscope 300 by fitting it onto the outside of the arthroscope body. The distal end of the shank 100 is connected to the cutting head 200, which can access confined surgical sites to cut tissue requiring release. The cutting head 200 and the shank 100 can be connected by welding or a single-piece molding process to ensure the overall strength and safety of the tool during release surgery.

[0024] like Figure 5As shown, a cutting section 210 is provided at a distance from the distal end of the tool holder 100. This cutting section 210 has a first cutting edge 211 and a second cutting edge 212. The cutting section 210 is a plate-like member that protrudes transversely to the tool holder 100. When viewed in the axial direction of the tool holder 100, it appears as a line segment, but when viewed transversely to the axial direction of the tool holder 100, it has an irregular shape, such as a triangle, polygon, strip, or one or both sides being arc-shaped. The plate-like member is fixed to the tool holder 100 by one edge, and the first cutting edge 211 and the second cutting edge 212 are formed by at least two other edges. When viewed axially, the first cutting edge 211 and the second cutting edge 212 are respectively located on different sides of the cutting section 210, having different, especially opposite, cutting directions, thereby providing the operational convenience of bidirectional cutting with the same feed operation. The cutting edge of the first cutting edge 211 is arranged along the advancing direction of the cutting rod 100, so that when the cutting rod 100 is driven forward to advance the cutting part 210, the first cutting edge 211 can cut the tissue structure it encounters with its cutting edge; in contrast, the cutting edge of the second cutting edge 212 is arranged along the retraction direction of the cutting rod 100, so that when the cutting rod 100 is driven backward to retract the cutting part 210, the second cutting edge 212 can cut the tissue structure it encounters with its cutting edge.

[0025] Preferably, such as Figure 5 As shown, the cutting portion 210 can be connected to the shank 100 via a straight transition section. According to another embodiment, the cutting portion 210 has a raised structure in a direction perpendicular to the axis of the shank 100, whereby "the cutting portion 210 extends beyond the outer wall of the sleeve of the shank 100 for fitting the arthroscopy 300 body" in a transversely distal direction. The degree of protrusion of the cutting portion 210 in the transverse direction of the shank 100 is achieved at least in part by deflection of the distal region of the shank 100 away from its axis.

[0026] like Figure 5 As shown, a strip-shaped component 220 extending along the axial direction of the tool holder 100 is formed at the distal end region. The strip-shaped component 220 is a flat, elongated structure with a width smaller than the diameter of the tool holder body, and its cross-section is rectangular or trapezoidal. A cutting section 210 is fixed to the side of the strip-shaped component 220 facing the arthroscope 300 body. Through the flat design of the strip-shaped component 220, a stable distance is formed between the cutting section 210 and the arthroscope 300 body, avoiding obstruction of the arthroscope's field of vision during cutting operations; at the same time, the axial extension characteristic of the strip-shaped component 220 can evenly distribute the cutting reaction force, improving cutting accuracy.

[0027] Combination Figure 2 , Figure 5The port of the sleeve outer wall of the tool holder 100, away from the adapter 110, is designed to form a non-perpendicular angle with the axis of the tool holder 100. This inclined port design results in unequal axial generatrice lengths of the distal circumferential outer wall of the tool holder 100 (see...). Figure 5 In the case of L1>L2), the strip 220 is positioned in the circumferential outer wall region where the axial generatrix length is longer. This configuration improves the installation stability of the cutting section 210 by increasing the contact area between the strip 220 and the shank 100; simultaneously, the inclined end face guides the shank 100 to smoothly advance along the tissue gap, reducing frictional resistance with surrounding tissues. Furthermore, the angle between the distal end plane of the shank 100 and the axis of the shank 100 can be optimized according to surgical needs, for example, between 60° and 85°, to balance the structural strength of the distal end of the shank and the field of view of the arthroscope 300 lens for the cutting section 210 and the surgical area.

[0028] The width W of strip 220 (see) Figure 5 The strip 220 is designed to effectively withstand resistance encountered when cutting tissue. Preferably, the width extends to at least one-quarter of the circumference of the lens envelope 310 on the outer surface of the arthoscope 300. The lens envelope 310 refers to the maximum radial contour line of the outer surface of the arthoscope 300 lens, showing the maximum physical space occupied by the lens in the radial direction. It can be considered as the outer diameter boundary line of the lens outer protective sleeve or barrel, and can be configured into other shapes such as circles or ellipses depending on the design of the lens body. The width design of the strip 220 ensures the stability and deformation resistance of the strip 220 when cutting pressure is applied. The length of the strip 220 is set such that the end of the cutting portion 210 fixed thereto facing the arthoscope 300 lens is spaced apart from the arthoscope 300 lens. Preferably, a sufficient distance needs to be maintained between the proximal end of the cutting portion 210 and the arthoscope 300 lens to avoid obstructing the field of vision during operation. This spacing not only ensures the operating field of vision of the arthoscope 300, but also takes into account the tissue reaction force that the strip 220 needs to withstand during cutting. Furthermore, to prevent significant deflection of the strip 220 due to force during cutting, the distance between the proximal end of the cutting section 210 and the lens of the arthroscope 300 should be controlled within an appropriate range. For example, this distance should be less than half the total length of the strip 220, preferably less than one-third of the total length of the strip 220, and particularly preferably less than one-quarter of the total length of the strip 220. This design balances the clarity of the cutting operation's field of vision with the structural stability of the strip 220, ensuring that in practical applications, it neither obstructs the field of vision nor causes excessive deformation of the strip 220 at the distal end of the tool holder 100.

[0029] like Figure 5 , Figure 6As shown, the cutting section 210 is formed by integral molding, shape interlocking, welding, or bonding of a plate-like component to the shank 100. The plate-like component can be triangular, polygonal, sickle-shaped, semi-circular, semi-elliptical, or a triangle or polygon with one side curved, or an arc-shaped ridge with at least a hyperbolic top surface. This diverse shape design aims to achieve multiple surgical functions of the plate-like component, including cutting, separation, suture passing, and puncture. Figure 5 As shown, when the plate-shaped member is triangular, its first edge facing the tool holder 100 is fixed to the tool holder 100. The second edge of the plate-shaped member points to the axial distal end of the tool holder 100, forming a first cutting edge 211, while the third edge in the opposite direction forms a second cutting edge 212. The cutting edges of the first cutting edge 211 and the second cutting edge 212 can be straight, single-curvature arc, or double-curvature arc.

[0030] Preferably, the cutting edge shapes of the first blade 211 and the second blade 212 of the cutting section 210 can be designed to be the same or different to meet different surgical needs and operating environments. Specifically, based on the shape characteristics of the cutting edges, the cutting section 210 can form a variety of different structural forms, such as... Figure 6 As shown, the cutting section 210 includes an arc-shaped push-cutting blade 230, a hook-cutting blade 240, a suture guide 250, and a pointed push-cutting blade 270. This versatile design allows the cutting section 210 to adapt to various surgical scenarios, performing functions such as push-cutting, hook-cutting, suture guiding, and puncture, thereby significantly improving the functionality and flexibility of the surgical tool.

[0031] The plate-like component of the arc-shaped push-cutting blade 230 forms an arc-shaped cutting edge at its distal end (i.e., the first cutting edge 211). The arc design of this cutting edge can be optimized as needed to enhance stability during the push-cutting process. The arc-shaped push-cutting blade 230 is particularly suitable for push-cutting operations, effectively reducing damage to tissues during cutting and providing precise cutting capabilities through the smooth transition of the arc-shaped cutting edge.

[0032] The plate-like component of the hook-cutting blade 240 has a hook-shaped cutting edge that curves proximally (i.e., the second cutting edge 212). One end of this cutting edge is fixed to the first edge of the blade shank 100, while the other end extends distally to the blade shank 100. The hook-cutting blade 240 is designed to penetrate and hook into target tissue, achieving precise grasping and cutting through the unique structure of the hook-shaped cutting edge, making it particularly suitable for surgical procedures requiring high control.

[0033] The suture guide 250 has a plate-like component with a hyperbolic curved top surface, forming a narrow slit or channel for guiding the suture through. The suture guide 250 is designed to assist in the precise passage of sutures, making it particularly suitable for suture or wire placement in complex surgical environments, ensuring that the suture is not damaged during passage.

[0034] The end of the plate-shaped part of the pointed push-cutting knife 270 (i.e., the first cutting edge 211) forms a sharp cutting edge, which can be straight or single-curvature arc to enhance the penetration ability.

[0035] Preferably, the cutting portion 210 has a reflective texture, a reflective element, is coated with fluorescence, or has an active light-emitting element. In particular, the second blade 212 has a reflective texture, a reflective element, is coated with fluorescence, or has an active light-emitting element. The reflective texture extends along the cutting direction of the second blade 212, and its reflective surface faces the imaging optical axis of the arthroscope 300 lens to maximize the reflection of the illumination light from the arthroscope 300 light source. The embedded reflective element can be a microprism or a reflective film, embedded in the proximal region of the second blade, aligned with the center of the field of view of the arthroscope 300 lens, ensuring that its development position in the image is fixed. The active light-emitting element is a micro LED, located at the distal tip of the second blade, connected to an external power source through a wire inside the blade holder, and has a light-emitting direction coaxial with the observation direction of the arthroscope 300 lens. The above design enables the second blade 212 to form a high-contrast linear marker in the arthroscopic 300 field of view. Even if the cutting part 210 occupies a small area of ​​the image, it can still be quickly located through reflective or active light-emitting features, reducing the risk of misoperation caused by narrow field of view or tissue obstruction during surgery, and improving cutting accuracy and surgical efficiency.

[0036] like Figures 2-4 As shown, the scalpel 100 is rotatably connected to the arthroscope 300 via an adapter 110. The adapter 110 includes a first fixing sleeve 111 and a second fixing sleeve 113, wherein the outer diameter of the first fixing sleeve 111 matches the inner diameter of the second fixing sleeve 113, allowing them to form an integral structure through a sleeve connection. Specifically, the inner wall of the second fixing sleeve 113 is provided with a retaining ring 112 perpendicular to its axis. This retaining ring 112 abuts against the proximal end of the first fixing sleeve 111, limiting the depth to which the first fixing sleeve 111 is inserted into the second fixing sleeve 113. The arthroscope 300 can be connected to the second fixing sleeve 113 of the adapter 110 by means of snap-fit ​​connection, threaded connection, or magnetic connection; the scalpel 100 is connected to the first fixing sleeve 111 via a rotatable connection. In the locked state, the arthroscope 300 and the adapter 110 of the scalpel 100 remain relatively fixed and do not rotate relative to each other. Meanwhile, the scalpel 100 can rotate freely within a 360-degree range around the axis of the arthroscope 300. This design allows for flexible adjustment of the scalpel 100 relative to the arthroscope 300 while ensuring connection stability, thereby significantly improving the precision and flexibility of surgical procedures.

[0037] Preferably, such as Figures 2-4As shown, the first retaining sleeve 111, located at the proximal end of the shank 100, is rotatable relative to the second retaining sleeve 113 but remains in position relative to each other along the axial direction of the shank 100. In the locked state of the adapter 110, a friction engagement 114 exists between the proximal end of the shank 100 and the distal end of the adapter 110 to generate frictional force. This friction engagement 114 provides resistance in the direction of rotation when the shank 100 rotates around the arthroscope body 300.

[0038] Preferably, such as Figure 5 , Figure 7 , Figure 8 As shown, the scalpel 100 can rotate relative to the adapter 110 to at least two different rotational positions to adjust the position of its cutting portion 210 relative to the tissue structure. During stenosing tenosynovitis release surgery, the scalpel 100 enters the target surgical site along a surgical channel pre-formed between the deep fascia and the tendon sheath. While the scalpel 100 advances along the channel, it can be positioned in a first rotational position without cutting, where the cutting edge of its cutting portion 210 faces away from the tissue structure to avoid unnecessary tissue damage. When the scalpel 100 reaches the surgical site requiring release through the channel, it can rotate to a second rotational position for cutting, so that the cutting edge of its cutting portion 210 faces the tissue structure to be released. This design allows for flexible control of the scalpel 100's rotational position during surgery, thereby effectively performing the cutting operation and minimizing interference with surrounding tissues, improving surgical precision and safety.

[0039] Preferably, the tool holder 100 is capable of continuous 360° rotation relative to the adapter 110. For example... Figures 7-10As shown, taking stenosing tenosynovitis of the flexor tendons as an example, before medical staff perform tendon sheath release surgery, a grooved plate 400 needs to be pre-inserted between the deep fascia and the tendon sheath. The grooved plate 400 separates the deep fascia and tendon sheath through its separating function, forming a spatial channel for the arthroscope 300 and the scalpel 100 to enter. As the scalpel 100 enters the surgical site requiring release along the pre-formed channel, the side of the grooved plate 400 facing away from the deep fascia (i.e., the side away from the skin surface) can be observed by the lens of the arthroscope 300. Since the cutting part 210 is linear in the field of view, this design helps medical staff accurately judge the direction of advance of the scalpel 100, thereby avoiding misoperation. During the advancement of the scalpel 100 along the channel, its cutting part 210 abuts against the inner wall of the grooved plate 400, in a first rotating position without cutting. When the scalpel 100 reaches the area requiring release, it rotates away from the inner wall of the grooved plate 400, so that the cutting part 210 faces away from the grooved plate 400 and towards the tendon sheath tissue, reaching the second rotation position. At this point, the cutting edge of the cutting part 210 can effectively release the corresponding tissue structure. This design allows medical personnel to precisely control the rotation of the scalpel 100, improving the accuracy and safety of the surgery, and reducing the risk of misoperation through reasonable layout and operation steps.

[0040] Preferably, during the withdrawal of the scalpel 100 along the pre-formed channel between the deep fascia and the tendon sheath, the scalpel 100 is able to be in a first non-cutting rotational position such that the cutting edge 210 thereon is away from the tissue structure.

[0041] Preferably, the scalpel 100 surrounds the body of the arthroscope 300 at its proximal end but allows the lens of the arthroscope 300 to be exposed, such that when the scalpel 100 reaches the site requiring release surgery via the channel, the image captured by the lens includes the second blade 212 of the cutting section 210 and the thickened tendon sheath tissue in contact with the cutting section 210.

[0042] Preferably, the scalpel 100 is made of high-strength medical-grade stainless steel or titanium alloy to ensure sufficient strength and corrosion resistance during surgery.

[0043] It should be noted that the above specific embodiments are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this utility model, and these solutions all fall within the scope of this utility model and its protection scope. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and do not constitute a limitation on the claims. The protection scope of this utility model is defined by the claims and their equivalents. Throughout the text, features introduced by "preferred" are merely optional and should not be construed as mandatory. Therefore, the applicant reserves the right to abandon or delete relevant preferred features at any time.

Claims

1. A scalpel for limb stenosis and fascioligament release, comprising a shank (100) and a blade (200), wherein the proximal end of the shank (100) is provided with an adapter (110) for mounting and holding it to an arthroscope (300), and the distal end of the shank (100) is provided with the blade (200), characterized in that, The distal region of the blade shank (100) is provided with a cutting section (210) having a first cutting edge (211) and a second cutting edge (212), wherein the first cutting edge (211) and the second cutting edge (212) have different cutting directions from each other. The first cutting edge (211) is capable of cutting through the tissue structure it encounters when the cutting shank (100) is driven forward to advance the cutting part (210). The second cutting edge (212) is capable of cutting through the tissue structure it encounters when the cutting part (210) is driven backward to retract the cutting part (100).

2. The knife of claim 1, wherein The cutting portion (210) is a plate-shaped member that protrudes transversely to the blade shank (100). The plate-shaped member is fixed to the blade shank (100) by means of one of its edges, and the plate-shaped member forms the first cutting edge (211) and the second cutting edge (212) by means of its other edges.

3. The knife of claim 1, wherein, The cutting section (210) extends beyond the lateral distal end of the blade (100) for fitting onto the outer wall of the sleeve of the arthroscopy (300) body.

4. The knife of claim 1, wherein, The distal region of the blade (100) forms a strip (220) extending along the axial direction of the blade (100), and the cutting part (210) is fixed to the side of the strip (220) facing the arthroscope (300).

5. The knife of claim 2, wherein, The plate-shaped part is fixed to the cutter bar (100) by means of integral molding, shape interlocking, welding or bonding to form the cutting part (210). The plate-shaped part is polygonal, a polygon with one edge being arc-shaped, or an arc-shaped ridge with a double curvature arc-shaped top surface. The plate-shaped part (210) has at least one side with reflective texture, reflective element, fluorescent coating or active light-emitting element.

6. The knife of claim 2, wherein, When the shape of the plate is triangular, its first edge facing the tool bar (100) is fixed to the tool bar (100), its second edge pointing to the axial distal end of the tool bar (100) forms the first cutting edge (211), and its third edge opposite to the axial distal end of the tool bar (100) forms the second cutting edge (212).

7. The cutting tool according to claim 1, characterized in that, The scalpel (100) is rotatably held on the body of the arthroscope (300) by means of the adapter (110), wherein the arthroscope (300) and the adapter (110) of the scalpel (100) are rotatably fixed to each other in the locked state, and the scalpel (100) is rotatable about the body of the arthroscope (300) relative to the arthroscope (300) and the adapter (110) which are rotatably fixed to each other.

8. The cutting tool according to claim 1, characterized in that, There is a friction fit (114) between the proximal end of the shank (100) and the distal end of the adapter (110) for generating frictional force, the friction fit (114) for providing resistance in the direction of rotation when the shank (100) rotates about the body of the arthroscope (300).

9. The cutting tool according to claim 1, characterized in that, When the scalpel (100) is held in the arthroscope (300) for a stenosing tenosynovitis release surgery, the scalpel (100) is inserted along a pre-formed channel between the deep fascia and the tendon sheath to the site requiring the release surgery, wherein, During the entry of the spar (100) along the channel, the spar (100) is able to be in a first non-cutting rotational position such that the cutting edge (210) thereon is away from the tissue structure; When the scalpel (100) reaches the site where the release surgery is required via the channel, the scalpel (100) can be in a second rotational position for cutting, such that the cutting edge (210) on it faces the tissue structure of the release surgery site.

10. The cutting tool according to claim 9, characterized in that, The scalpel (100) surrounds the body of the arthroscope (300) at its proximal end but allows the lens of the arthroscope (300) to be exposed, such that when the scalpel (100) reaches the site requiring release surgery through the channel, the image captured by the lens includes the second blade (212) of the cutting section (210) and the thickened tendon sheath tissue in contact with the cutting section (210).

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