A spreader guide suitable for use in transection of the transverse carpal ligament

Abstract

The utility model discloses a kind of distraction guides suitable for transverse ligament of wrist cutting, including hingedly upper support plate and lower support plate, the upper support plate and lower support plate are all by short side and long side constitute L type, the short side of the upper support plate and lower support plate is provided with the arc-shaped portion bending to one direction and different bending angles, the arc-shaped portion is provided with the elastic device fixed two short side distraction angles.The utility model can adapt to small incision, can also expose surgical field, protect nerve, and also do not affect the instrument of operation.

Description

Technical Field

[0001] This utility model belongs to the field of medical devices, specifically relating to a spreading guide suitable for wrist transverse ligament cutting. Background Technology

[0002] Carpal tunnel syndrome (CTS) is a peripheral nerve entrapment syndrome caused by compression of the median nerve within the carpal tunnel. Whether the contents of the carpal tunnel increase or decrease in its volume, increased pressure within the tunnel can compress the median nerve. The main symptoms are pain in the anterior wrist and numbness and weakness in the hand, commonly affecting the thumb, index finger, and middle finger areas innervated by the median nerve. Conservative treatment is the first-line approach, especially for patients with mild symptoms and a short disease duration (including bracing, local physical therapy, local injections, and oral medication). Surgical treatment may be considered for patients who do not respond to conservative treatment, experience recurrent symptoms, or develop thumb muscle atrophy. Surgical treatments include open carpal tunnel decompression (OCTR) and endoscopic carpal tunnel decompression (ECTR). Open carpal tunnel decompression (OCTR): While highly effective, this open surgery is more invasive, and scarring can lead to contractures that impair wrist function.

[0003] Endoscopic carpal tunnel decompression (ECTR): With the development of endoscopic technology and surgical instruments, endoscopic carpal tunnel decompression has been widely used in recent years. Compared with traditional open-circuit transluminal (OCT) surgery, ECTR has certain advantages, including less trauma and a shorter postoperative recovery period. Currently, endoscopic surgery often uses existing orthopedic, microsurgical, or otolaryngological instruments such as retractors, nerve dissectors, periosteal elevators, and retractors. Traditional retractors are relatively wide or have an inward curvature and a smooth back, making them difficult to access through small incisions. Even if they can be accessed, they will affect the surgical operation. The smooth back also fails to effectively block blood vessels and nerves, providing adequate protection. A specialized instrument that can effectively protect blood vessels and nerves, provide a clear surgical field, and reduce trauma and scarring through small incisions has not yet been reported, increasing the difficulty of treating carpal tunnel syndrome with small incisions. Therefore, an instrument is needed that allows for small incisions, exposes the surgical field, protects nerves, and does not interfere with the surgical procedure. Utility Model Content

[0004] To address the challenges of small incision treatment for carpal tunnel syndrome in existing technologies, an instrument is needed that allows for small incisions, exposes the surgical field, protects nerves, and does not interfere with the procedure. This invention provides a retractor guide suitable for transverse carpal ligament cutting.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A retractor guide for transverse carpal ligament cutting includes a hinged upper support plate and a lower support plate. Both the upper and lower support plates are L-shaped, formed by short and long sides. The short sides of each plate have arc-shaped portions that bend in one direction at different angles. Each arc-shaped portion has an elastic device that fixes the retracting angle of the two short sides. Folding the upper and lower support plates reduces their size, making them suitable for small incisions. The support plates can rotate around a pivot pin, allowing for flexible and stable rotation of the upper and lower support plates around the pivot pin, meeting the needs of multi-angle adjustments during surgery.

[0006] As a further optimization of this utility model, the short sides of the upper support plate and the lower support plate are provided with bending portions that bend in one direction at an angle of 120-150 degrees.

[0007] As a further optimization of this utility model, the elastic device includes a hinge fixedly disposed on one of its short sides, and a pin hole disposed on the other short side. A stud is mounted on the hinge, with the other end of the stud located inside the stud hole. The stud can move within the stud hole and rotate along the pin on the hinge. Springs are mounted on the studs of the upper and lower support plates. During the opening process of the upper and lower support plates, the studs move within the stud mounting holes to prevent the studs from jamming.

[0008] As a further optimization of this utility model, the upper support plate is provided with a knife groove along its long side, which provides a professional channel for the transverse carpal ligament cutting knife (pushing knife or hook knife), opening up the surgical field without hindering the surgical operation.

[0009] Furthermore, both the support plate and the lower support plate are arc-shaped structures, with the ends of the short sides set as arcs, which reduces damage to surrounding tissues during surgical entry and fully reflects the humanized design concept of the device.

[0010] This novel design features a curved structure and elastic device that work synergistically to ensure the instrument remains stable and conforms to the wrist during dislocation, minimizing intraoperative movement. The dislocation angle is flexibly adjustable, and the hinged design allows for relative movement between the upper and lower support plates. Surgeons can dynamically adjust the dislocation amplitude according to intraoperative needs, adapting to the anatomical differences of different patients. The vertical arrangement of the long and short sides allows for precise control of the dislocation direction, ensuring the surgical instrument enters the target area along the correct trajectory. The varying angles of the curved section match the physiological curvature of the transverse carpal ligament, reducing the risk of compression on surrounding blood vessels and nerves. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of the present invention from angle one; Figure 2 This is a schematic diagram of the structure of this utility model from angle two; Figure 3 for Figure 2 Enlarged view of A in the middle; In the diagram, 1. Upper support plate, 2. Lower support plate, 3. Pin, 4. Hinge, 5. Stud, 6. Bolt, 7. Spring, 8. Bend, 9. Pin, 10. Slot, 11. Stud mounting hole. Detailed Implementation

[0012] like Figures 1-3 As shown, a retraction guide suitable for transverse carpal ligament cutting includes a hinged upper support plate and a lower support plate. Both the upper and lower support plates are L-shaped, consisting of a short side and a long side. The L-shaped design provides multi-directional support force. The long side is used for stable fixation in the surgical area, while the short side, through a curved section, precisely controls the retraction range, enhancing the fit between the instrument and the wrist anatomy. The short sides of both the upper and lower support plates are provided with curved sections bending in one direction to ensure the precision and stability of the surgical operation and to effectively block and fix the median nerve, preventing damage. The curved section is equipped with an elastic device to fix the retraction angle of the two short sides.

[0013] The elastic device includes a hinge fixed on one of its short sides and a pin hole on the other short side. A stud is mounted on the hinge, with its other end located within the stud hole. The stud can move within the stud hole and rotate along the pin on the hinge. Springs are mounted on the studs of the upper and lower support plates. The movement and rotation of the stud within the pin hole allow for dynamic adjustment of the spreading angle, accommodating differences in ligament thickness among patients. The spring loading mechanism provides controllable elastic tension, maintaining the spreading state in real time during surgery, avoiding frequent manual adjustments, and improving operational consistency.

[0014] The upper support plate has a scalpel groove along its long side to provide a fixed cutting path for the scalpel, ensuring consistency in incision depth and direction and reducing the risk of accidental cutting. Both the upper and lower support plates are arc-shaped structures; directional bending precisely guides the direction of expansion, preventing accidental damage caused by instrument deviation during ligament cutting. The ends of the short sides are rounded to reduce mechanical friction on the median nerve and blood vessels, protecting sensitive tissues.

[0015] The process of using this utility model is as follows: A 1cm incision is made in the transverse direction of the wrist or the longitudinal direction of the base of the palm to cut the skin and subcutaneous tissue, cut the fascia, wet the product of this utility model patent, insert the distal end of the long side, and slowly open it while inserting it. The arthroscope is inserted between the upper and lower plates from one side, and a push knife or hook knife is inserted into the special channel of the upper plate to cut the transverse carpal ligament.

Claims

1. A retractor guide suitable for transverse carpal ligament cutting, characterized in that, It includes a hinged upper support plate and a lower support plate, both of which are L-shaped and are composed of a short side and a long side. The short sides of the upper and lower support plates are provided with arc-shaped parts that bend in one direction and have different bending angles. The arc-shaped parts are provided with elastic devices that fix the opening angle of the two short sides.

2. The spreading guide for transverse carpal ligament cutting according to claim 1, characterized in that, The elastic device includes a hinge fixedly mounted on one of its short sides, a pin hole provided on the other short side, a stud mounted on the hinge, the other end of the stud located in the stud hole, the stud being movable within the stud hole, the stud being rotatable along the pin on the hinge, and springs mounted on the studs of the upper and lower support plates.

3. The spreading guide for transverse carpal ligament cutting according to claim 2, characterized in that, The arc-shaped portion of the short side of the upper support plate has an angle of 120-150 degrees, and the arc-shaped portion of the short side of the lower support plate has an angle of 120-150 degrees.

4. The retractor guide for transverse carpal ligament cutting according to claim 3, characterized in that, The upper support plate is provided with a knife groove along its long side.

5. The spreading guide for transverse carpal ligament cutting according to claim 4, characterized in that, Both the upper and lower support plates are arc-shaped structures.

6. The retractor guide for transverse carpal ligament cutting according to any one of claims 1-5, characterized in that, The end of the short side is set to be rounded.

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