A cutting device for soft tissue release surgery

Abstract

This invention relates to the field of medical device technology, specifically disclosing a cutting device for soft tissue release surgery, including a blade, a transparent cannula, a push rod, and an operating handle. The operating handle comprises an upper shell and a lower shell, and a frictional motion structure is provided inside the operating handle formed by the upper and lower shells. The frictional motion structure inside the operating handle of this invention includes a sliding friction structure between two inclined planes and a rolling friction structure between an arc and a straight plane. The sliding between the two inclined planes converts translational motion in one direction into translational motion in a 90° direction. By setting the angle of the inclined planes, the displacement of the driven member is made less than the displacement of the driving member, thereby amplifying the displacement. The sliding between the arc and the straight plane converts the rotation of the arc of the driving member into translational motion of the driven member, thereby amplifying the displacement. After the displacement of the driven member is amplified by the driving member, it can be precisely controlled, realizing dynamic and fine adjustment of the blade lifting and cutting amount according to individual needs.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a cutting device for soft tissue release surgery. Background Technology

[0002] In orthopedics, a common condition involves soft tissue lesions (ligaments, aponeurosis, etc.) that swell, thicken, and harden, compressing underlying blood vessels or nerves, causing pain and numbness in the affected area. A typical example is carpal tunnel syndrome, a group of symptoms and signs caused by compression of the median nerve in the carpal tunnel, and one of the most common peripheral nerve entrapment syndromes. Patients experience tingling, numbness, weakness, or pain on the radial side of the hand and three and a half fingers on the radial side, and some may also experience pain in the arm between the hand and elbow. Traditional surgery for carpal tunnel syndrome involves making an incision in the wrist to expose and cut the transverse carpal ligament to release nerve compression. However, this method is highly invasive and carries a significant risk of postoperative infection. Currently, a more common approach is endoscopic minimally invasive release surgery, where a long, thin blade with a cutting edge is used to cut the affected soft tissue under endoscopic (arthroscopic) guidance.

[0003] Endoscopic minimally invasive carpal tunnel release surgery is divided into two main categories: the Chow approach and the Agee approach. The Chow approach involves making two small incisions, approximately 25px each, proximally and distally in the carpal tunnel. Under endoscopic guidance, a small hook scalpel is used to cut the transverse carpal ligament. One incision is used to insert the arthroscope, and the other is used to insert the hook scalpel; they are inserted towards each other. During the procedure, the surgeon needs to hold the arthroscope in one hand and the scalpel in the other, or the surgeon holds the scalpel while an assistant supports the arthroscope. The Agee approach involves making only one small incision proximally in the carpal tunnel. Under endoscopic guidance, a special scalpel is used to cut and release the transverse carpal ligament.

[0004] Compared to the double-entry approach, the single-incision surgical method involves one less incision, resulting in less trauma and a relatively simpler surgical procedure. However, this single-incision method requires the scalpel and arthroscopy to be inserted in the same direction through the same incision. This special scalpel combines the arthroscopy's ability to provide a field of view with the blade's cutting function, rather than being a regular surgical scalpel. For example, CN201710339317 describes a compact endoscopic surgical blade assembly and its usage method, in which the blade and endoscope (also known as an arthroscope) are integrated. The endoscope is inserted through the assembly's internal hole behind the blade, providing a field of view for intraoperative cutting.

[0005] Currently, the lifting amount of this special cutting blade is manually controlled by a rear-end operating handle. The lifting amount of the blade determines the cutting depth; the higher the blade is raised relative to the tube, the thicker the soft tissue that can be cut. In actual surgery, the thickness of the cut soft tissue is generally around 4mm, which means that the lifting amount of the blade is very small. Excessive lifting amount can cause tissue damage. Moreover, patients have individual differences, and the cutting thickness varies. For example, some people need to cut ligaments to a thickness of 4mm, while others need to cut 3mm or 5mm. This kind of fine blade height adjustment cannot be achieved by existing devices. Furthermore, some patients' transverse carpal ligaments become thick and hard due to disease, requiring a lot of force to completely sever them. Current devices require the surgeon to manually control and maintain the cutting height of the blade, which easily leads to hand fatigue. To solve these drawbacks of existing devices, this invention designs a cutting device for soft tissue release surgery that can finely adjust the blade lifting height and lock the blade position after lifting. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a cutting device for soft tissue release surgery, which solves the problems of very small blade lifting range, difficulty in precise hand control of the specific lifting range, and easy hand fatigue during surgery.

[0007] The cutting device for soft tissue release surgery of the present invention includes a blade, a transparent cannula, a push rod, and an operating handle.

[0008] The operating handle includes an upper shell and a lower shell. A friction motion structure is provided inside the operating handle formed by the upper shell and the lower shell. The friction motion structure includes a driving member and a driven member. The driving member and the driven member are in frictional contact. One end of the push rod is connected to the driven member, and the other end is rotatably connected to the blade. The driving member pushes the driven member to move. The driven member drives the push rod to move back and forth in a linear motion. The movement of the push rod is transmitted to the blade through a rotating shaft, so as to lift or retract the blade from the transparent sleeve.

[0009] The operating handle is also provided with a one-way limiting structure, which includes a ratchet and a pawl. The ratchet is adapted to the driving component in the friction motion structure. The ratchet is provided with a helical tooth structure and cooperates with the pawl to achieve one-way limiting. The pawl is controlled independently by the unlocking device on the operating handle.

[0010] As a further improvement of the present invention, the pawl is provided with a torsion spring structure for automatic reset of the pawl, and at least one of the driving and driven members of the friction motion structure includes an elastic structure for position reset of the driving and driven members.

[0011] As a further improvement of the present invention, the operating handle includes a guide structure inside, which is cone-shaped and fixedly connected to the upper or lower shell that makes up the operating handle, for guiding the insertion of the arthroscope.

[0012] As a further improvement of the present invention, the transparent sleeve has scale markings on its surface to indicate the length, and the front end of the transparent sleeve is open on one side for lifting the blade; the front end of the transparent sleeve is also provided with a shaft hole, in which a shaft is provided for connecting the blade and allowing the blade to rotate around the shaft.

[0013] As a further improvement of the present invention, the push rod is located inside the transparent sleeve, and the push rod moves in a reciprocating linear motion along the inner cavity of the transparent sleeve. There is a blade rotation groove above the head end of the push rod, and the blade rotates in the blade rotation groove.

[0014] As a further improvement of the present invention, the driving component of the friction motion structure is a cam, and the driven component is a slider. The cam presses the slider by rolling friction to realize the forward and backward movement of the slider. A shaft is connected to the middle of the cam, and a ratchet is also installed on the shaft. The shaft drives the cam and the ratchet to rotate, thereby realizing the movement of the driven component and the synchronous locking of its position.

[0015] As a further improvement of the present invention, the follower of the friction motion structure has a through hole in the center for the passage of an arthroscope, and a spring return structure is provided on one side of the follower.

[0016] As a further improvement of the present invention, a U-shaped groove is provided on one side of the operating handle, and protrusions are symmetrically arranged on the U-shaped groove for limiting the arthroscopy.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] The friction motion structure inside the operating handle of this invention includes a sliding friction structure between two inclined surfaces and a rolling friction structure between an arc and a straight surface. The sliding between the two inclined surfaces converts translational motion in one direction into translational motion in a 90° direction. By setting the angle of the inclined surfaces, the displacement of the driven component is made smaller than the displacement of the driving component, thus amplifying the displacement. The sliding between the arc and the straight surface converts the rotation of the driving component's arc into translational motion of the driven component, thereby amplifying the displacement. After the displacement of the driven component is amplified by the driving component, it can be precisely controlled, realizing dynamic and fine adjustment of the blade lifting and cutting amount according to individual needs.

[0019] The locking pawl and ratchet work together to prevent the ratchet from rotating, thus achieving one-way locking of the angle. Locking the ratchet angle means locking the raised position of the front blade, preventing the raised part of the blade from retracting. This eliminates the need to constantly operate the button (or wheel) on the handle during the operation, thus eliminating the drawback of easy hand fatigue for the operator. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 : A three-dimensional schematic diagram of the present invention;

[0022] Figure 2 : A three-dimensional schematic diagram of the invention viewed from below;

[0023] Figure 3 : Schematic diagram of the parts after removing the lower shell and guide plate of the present invention;

[0024] Figure 4 : A schematic diagram of the cut position in the bottom view of this invention;

[0025] Figure 5 This invention Figure 4 Section AA;

[0026] Figure 6 : A perspective view of the blade of this invention;

[0027] Figure 7 : A diagram of the blade and push rod assembly of this invention;

[0028] Figure 8 The present invention relates to the push rod rear end structure;

[0029] Figure 9 Assembly diagram of the pusher, block, and slider of this invention;

[0030] Figure 10 : Schematic diagram of the slider structure of the present invention;

[0031] Figure 11 : Schematic diagram of the cross-sectional position of the slider in this invention;

[0032] Figure 12 This invention Figure 11 Cross-sectional view of the middle section (BB);

[0033] Figure 13 Diagram showing the fit between the guide plate and the upper shell of this invention;

[0034] Figure 14 Assembly diagram of the cam and ratchet of this invention;

[0035] Figure 15 : Schematic diagram of the cam and slider movement dimensions of this invention;

[0036] Figure 16 : Schematic diagram of the ratchet and pawl engagement of the present invention;

[0037] Figure 17 : A three-dimensional schematic diagram of the ratchet pawl of the present invention;

[0038] Figure 18 : A three-dimensional schematic diagram of the upper and lower shells combined in Embodiment 2 of the present invention;

[0039] Figure 19 : Schematic diagram of the inside of the operating handle in Embodiment 2 of the present invention;

[0040] Figure 20 : A front view of the operating handle in Embodiment 2 of the present invention;

[0041] Figure 21 This invention Figure 20 AA cross-sectional diagram;

[0042] Figure 22 : A three-dimensional schematic diagram of the combination of the pawl and the pressing block of the present invention;

[0043] Figure 23 The present invention includes a three-dimensional and schematic diagram of the combination of helical teeth, slider, and slider inclined surface;

[0044] Figure 24 : Schematic diagram of the mounting groove and rotating shaft combination of the present invention;

[0045] Figure 25 : A three-dimensional schematic diagram of the arthroscope and liner tube of the present invention;

[0046] Figure 26 A schematic diagram of the internal structure of the inner liner tube of this invention;

[0047] Figure 27 A schematic diagram of the movement direction of the pressing block and slider combination of the present invention.

[0048] In the diagram: 01. Head end; 02. Blade; 03. Transparent sleeve; 04. Toggle switch; 05. Upper shell; 06. Lower shell; 07. Rotary wheel; 08. Large locking screw; 09. Small locking screw; 10. Limiting screw; 11. Block; 12. Slider; 13. Large torsion spring; 14. Cam; 15. Spring; 16. Large rotating shaft; 17. Pawl; 18. Small torsion spring; 19. Push rod; 20. Guide plate; 21. Small rotating shaft; 22. Push rod locking pin; 23. Spring locking pin; 24. Ratchet; 25. Button; 26. Spring 1; 27. Spring 2; 28. Arthroscopy;

[0049] 0201, Blade cutting edge; 0202, Blade shaft; 0203, Shaft hole;

[0050] 0301, Blade shaft hole; 0302, Observation window;

[0051] 0501, Connecting post; 0502, Slider; 0503, Pressing block;

[0052] 05021, inclined plane

[0053] 05022, Button connecting rod; 05024, Helical tooth; 05023, Spring guide rod;

[0054] 0601, U-shaped groove;

[0055] 1101. Glue overflow tank;

[0056] 1201, Through hole; 1202, Cam pressing part; 1203, Spring locking pin threaded hole; 1204, Push rod locking pin threaded hole;

[0057] 1401, Torsion spring mounting hole; 1402, Shaft mounting hole;

[0058] 1701, Locking pawl; 1702, Torsion spring retaining groove; 1703, Pawl pivot; 1704, Toggle switch mounting part;

[0059] 1705, Limiting block; 1706, Mounting slot; 1707, Rotating shaft;

[0060] 1901, sliding groove; 1902, push rod head end; 1903, blade rotation groove; 1904, push rod; 1905, groove structure;

[0061] 2001, Mounting column; 2002, Narrow front channel; 2003, Wide rear channel;

[0062] 2801, right inner liner tube; 2802, left inner liner tube. Detailed Implementation

[0063] The following illustrations disclose several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details are not intended to limit the invention. That is, in some embodiments of the invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the illustrations in a simple schematic manner.

[0064] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0065] Example 1:

[0066] like Figures 1 to 7As shown, the front end of the cutting device includes a head end 01, a blade 02, and a transparent sleeve 03. The head end 01 and the transparent sleeve 03 can be manufactured as two separate parts and then connected and fixed into one piece by common mechanical connection methods, such as bonding, interference fit, or pin fixing. Alternatively, they can be manufactured as a single piece using injection molding. The head end 01 has a tapered shape. The transparent sleeve 03, located at the blade 02 position, has a blade pivot hole 0301 and an observation window 0302. The blade 02 has a pivot hole 0203, through which a small rotating shaft 21 passes, allowing the blade to rotate around the small rotating shaft 21. The observation window 0302 is a notch on the transparent sleeve 03. The transparent sleeve 03 is designed with scale markings to indicate the length. The transparent sleeve 03 is made of a material with good light transmittance, preferably acrylic or polycarbonate.

[0067] The blade 02 also includes a blade edge 0201 and a blade shaft 0202. The blade edge is sharp and used for cutting soft tissue. The blade shaft 0202 engages with a sliding groove 1901 on the push rod 19, allowing the blade shaft 0202 to slide up and down within the sliding groove 1901. The front end of the push rod 19 is the push rod head end 1902, which can be integrally machined with the subsequent push rod 1904 or machined separately. The two are connected by common mechanical methods such as bonding, threaded connection, and welding. Above the push rod head end 1902 is a blade rotation groove 1903, within which the blade 02 rotates.

[0068] The operating handle is connected to the rear side of the transparent sleeve 03. The operating handle is divided into an upper shell 05 and a lower shell 06. There is a U-shaped groove 0601 on the rear side of the lower shell 06. The upper shell 05 and the lower shell 06 are connected by a snap and screw.

[0069] See Figure 14 and Figure 19 The friction motion structure includes a slider 12, a movable block 0502, a pressing block 0503, and a cam 14;

[0070] like Figures 8-12 As shown, the push rod 1904 on the push rod 19 is connected to a groove structure 1905 at its rear end. The push rod locking pin 22 is screwed into the push rod locking pin threaded hole 1204 on the slider 12 and abuts against the groove structure 1905 on the push rod 19, thereby connecting the slider 12 and the push rod 19 together. The back-and-forth sliding of the slider 12 causes the push rod 19 to slide back and forth accordingly.

[0071] The transparent sleeve 03 has a plug 11 at its rear end, which is inserted into the transparent sleeve 03. The surface of the plug 11 has an overflow groove 1101. After glue is dripped in, the plug 11 is connected to the transparent sleeve 03. The slider 12 has a through hole 1201 in the center for the arthroscope to pass through. The slider 12 also has a spring locking screw threaded hole 1203 on one side, and a spring locking screw 23 is installed thereon.

[0072] like Figure 13 As shown, the guide plate 20 follows the slider 12. The guide plate 20 has a mounting post 2001, which is installed into the connecting post 0501 on the upper shell 05, thereby fixing the guide plate 20. Structurally, the guide plate 20 has a front narrow channel 2002 on the front side and a rear wide channel 2003 on the rear side. The inner diameter of the front narrow channel 2002 is smaller than that of the rear wide channel 2003, and the whole structure fits the size of the arthroscope.

[0073] like Figures 14-15 As shown, a large rotating shaft 16 is installed inside the cavity of the operating handle, which consists of an upper shell 05 and a lower shell 06. A cam 14 and a ratchet 24 are mounted on the large rotating shaft 16. The cam 14 pushes the cam pressing part 1202 on the slider 12, causing the slider 12 to move forward. The slider 12 drives the push rod 19 to move. The front end of the push rod 19 cooperates with the blade shaft 0202 of the blade 02, thereby causing the blade 02 to rotate along the small rotating shaft 21, thus lifting the blade 02. One end of the large rotating shaft 16 is connected to a rotating wheel 07, which is fixed by a large locking screw 08, and the other end is connected to a limit screw 10.

[0074] See Figure 14 The cam 14 presses against the slider 12, pushing the slider 12 to move. The distance L2 between the outermost tangent circle and the inner circle of the cam 14 is not less than the distance L1 that the slider 12 moves. The distance L1 that the slider 12 moves is 1 to 4 mm. The cam 14 includes a torsion spring mounting hole 1401 for mounting the large torsion spring 13, and a shaft mounting hole 1402 for mounting on the large rotating shaft 16. The shaft mounting hole 1402 can serve as a circumferential limit.

[0075] like Figures 16-17 As shown, ratchet 24 and pawl 17 work together. Pawl 17 restricts ratchet 24 to move only in direction 1. When the rotating wheel 07 is turned in direction 1, the large torsion spring 13 mounted on the large rotating shaft 16 is torn and compressed. Ratchet 24 also rotates synchronously in direction 1, pushing pawl 17 to torsion the small torsion spring 18 and rotate in the opposite direction of direction 1 until its locking pawl 1701 jumps into the next ratchet tooth. Slider 12 is pushed forward, and the spring 15 connected to it is stretched.

[0076] The pawl 17 has a torsion spring fixing groove 1702 for fixing one end of a small torsion spring 18. The pawl 17 rotates along the pawl shaft 1703, and the small torsion spring 18 is sleeved on the pawl shaft 1703. The other end is fixed to the upper housing 05 of the operating handle. The end of the pawl 17 is a toggle switch mounting part 1704, and the toggle switch 04 and the pawl 17 are firmly connected together by a small locking screw 09.

[0077] After the locking pawl 1701 falls into the ratchet 17 teeth, if the ratchet 24 rotates in the opposite direction of direction 1 at this time, it cannot rotate due to the locking pawl 1701, thus achieving angle locking. The locking of the ratchet angle means the locking of the entire large rotating shaft 16, which means the locking of the position of the cam 14. The locking of the position of the cam 14 also means the locking of the lifting position of the front blade 02, and the lifting part of the blade 02 cannot retract.

[0078] When the lever 04 is pulled, the pawl 17 rotates in the opposite direction of direction 1, thereby separating the locking pawl 1701 and the ratchet 24. The large rotating shaft 16 also rotates in the opposite direction of direction 1 under the restoring torque of the large torsion spring 13. The slider 12 retracts backward under the tension of the spring 15. Simultaneously, the slider 12 drives the front push rod 19 to retract backward, and the push rod 19 drives the blade 02 along... Figure 5 Rotate the view counterclockwise, and the blade 02 automatically retracts into the transparent sleeve 03, thus completing the unlocking action.

[0079] The ratchet 24 is equipped with multiple locking teeth, which can precisely and quantitatively adjust the rotation angle of the large rotating shaft 16, thereby achieving quantitative, fine, and adjustable lifting height of the blade 02 relative to the transparent sleeve 03.

[0080] Example 2:

[0081] Figures 18-25 This is a schematic diagram of Example 2, which is described in detail below:

[0082] The cutting device includes a transparent sleeve 03, which is manufactured from transparent resin using conventional processing methods, preferably injection molding. The transparent sleeve 03 has a notch at its front end for storing the blade 02. The very tip of the transparent sleeve 03 has a rounded arc shape, which helps to avoid tissue damage during insertion and facilitates instrument insertion.

[0083] like Figure 18 As shown, the transparent sleeve 03 is connected to the operating handle formed by the upper shell 05 and the lower shell 06 of the operating handle, and is fixed by structural limiting snap-fit ​​or adhesive bonding. The upper shell 05 and the lower shell 06 of the operating handle are made of resin material and are connected together by traditional snap-fit, adhesive bonding or ultrasonic welding.

[0084] like Figures 19-24As shown, a pressing block 0503 and a movable block 0502 are installed inside the upper shell 05 of the operating handle. The sliding inclined surface 05021 of the movable block 0502 and the surface shape of the pressing block 0503 are matched and fitted.

[0085] The movable block 0502 includes a button connecting rod 05022, a helical tooth 05024, and a spring guide rod 05023. The button 25 is mounted on the button connecting rod 05022. The helical tooth 05024 and the pawl 17 cooperate. The spring guide rod 05023 and the spring 26 are matched. The spring 26 is installed in a cylindrical boss hole inside the upper shell 05 of the operating handle.

[0086] The pawl 17 includes a limit block 1705, which matches the helical tooth 05024 to achieve unidirectional limit of the moving block 0502.

[0087] The pawl 17 also includes a mounting slot 1706 and a pivot 1707 for mounting the elastic element and mounting the pawl 17 and the elastic element together with the toggle switch 25.

[0088] A push rod 19 is connected to the front end of the pressing block 0503. The push rod 19 and the blade 02 are rotatably connected together via a shaft. A spring 27 is installed on one side of the pressing block 0503 for returning the pressing block 0503 to its original position.

[0089] In practical use: Press button 25, and the movable block 0502 moves in the direction of button 25. At this time, the slider inclined surface 05021 of the movable block 0502 pushes the pressing block 0503 forward. The helical tooth 05024 on the other side of the movable block 0502 moves the pawl 17. The pressing block 0503 pushes the push rod 19 forward, causing the blade 02 to extend out of the transparent sleeve 03 along the rotating shaft. At this time, due to the opposite direction limiting function of the limiting block 1705 on the pawl 17, the blade 02 extending out of the transparent sleeve 03 cannot retract, thereby realizing automatic control of the cutting amount without the surgeon having to keep pressing the button to cut.

[0090] When the surgical incision is completed or the incision depth is to be adjusted, toggle switch 04 is activated. Switch 04 rotates pawl 17, causing limit block 1705 and helical teeth 05024 to separate. Through the combined action of springs 26 and 27, the blade 02 is retracted into the transparent sleeve 03, and button 25 is reset. Pressing button 25 again allows the blade 02 to be lifted more precisely by observing the amount of lifting, judging the clicking sound from pawl 17, or referring to the markings on the operating handle. This allows for accurate determination of the incision depth.

[0091] like Figures 25-26As shown, this device also includes an arthroscope 28 guide structure, which consists of a right inner liner tube 2801 and a left inner liner tube 2802. These two tubes can be connected together using bonding, ultrasonic welding, or other processes commonly used in the mechanical field. This guide structure serves to guide the arthroscope when it is inserted into the device.

[0092] like Figure 27 As shown, in this embodiment, the vertical movement of the movable block 0502 is converted into the horizontal movement of the pressing block 0503 through inclined plane friction. By adjusting the angle of the inclined plane, the value of L1:L2 can be changed. The value of L1:L2 must be greater than 1 to achieve the displacement amplification effect. That is, the movable block 0502 needs to move a larger stroke to achieve the pressing block 0503 a smaller stroke. In this way, the amount of movement of the pressing block 0503 can be finely adjusted.

[0093] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A cutting device for soft tissue release surgery, comprising a blade, a transparent cannula, a push rod, and an operating handle. Its features are: The operating handle includes an upper shell and a lower shell. A friction motion structure is provided inside the operating handle formed by the upper shell and the lower shell. The friction motion structure includes a driving member and a driven member. The driving member and the driven member are in frictional contact. One end of the push rod is connected to the driven member, and the other end is rotatably connected to the blade. The driving member pushes the driven member to move. The driven member drives the push rod to move back and forth in a linear motion. The movement of the push rod is transmitted to the blade through a rotating shaft, so as to lift the blade from the transparent sleeve. The operating handle is also provided with a one-way limiting structure, which includes a ratchet and a pawl. The ratchet is adapted to the active component in the friction motion structure. The ratchet is provided with a helical tooth structure and cooperates with the pawl to achieve one-way limiting. The pawl is controlled separately by the unlocking device on the operating handle. The driving component of the friction motion structure is a cam, and the driven component is a slider. The cam presses the slider by rolling friction to realize the forward and backward movement of the slider. A large rotating shaft is connected to the middle of the cam, and a ratchet is also installed on the large rotating shaft. The large rotating shaft drives the cam and ratchet to rotate, which is used to adjust the height of the blade relative to the transparent sleeve, so as to realize the movement of the driven component and the synchronous locking of its position. The front end of the transparent sleeve is also provided with a shaft hole, and a shaft is provided inside for connecting the blade so that the blade can rotate around the shaft.

2. The cutting device for soft tissue release surgery according to claim 1, characterized in that: The pawl is provided with a torsion spring structure for automatic reset of the pawl, and at least one of the driving and driven components of the friction motion structure includes an elastic structure for position reset of the driving and driven components.

3. The cutting device for soft tissue release surgery according to claim 1, characterized in that: The operating handle contains a guide structure, which is cone-shaped and fixedly connected to the upper or lower shell that makes up the operating handle, for guiding the insertion of the arthroscope.

4. The cutting device for soft tissue release surgery according to claim 1, characterized in that: The transparent sleeve has graduations on its surface to indicate length, and an opening on one side of the front end of the transparent sleeve for lifting the blade.

5. The cutting device for soft tissue release surgery according to claim 4, characterized in that: The push rod is located inside the transparent sleeve. The push rod moves back and forth in a straight line along the inner cavity of the transparent sleeve. There is a blade rotation groove above the head end of the push rod. The blade rotates in the blade rotation groove.

6. The cutting device for soft tissue release surgery according to claim 1, characterized in that: The follower of the friction motion structure has a through hole in the center for the arthroscope to pass through, and a spring return structure is provided on one side of the follower.

7. The cutting device for soft tissue release surgery according to claim 1, characterized in that: The operating handle has a U-shaped groove on one side, and symmetrical protrusions are arranged on the U-shaped groove for limiting the position of the arthroscope.

Images