Carpal canal ligament cutting assembly

Abstract

The utility model belongs to the technical field of surgical tools, and particularly relates to a carpal canal ligament cutting assembly which comprises a cutting knife and a knife guide rod, the knife guide rod comprises an isolation plate used for being inserted between a transverse carpal ligament and a median nerve in a wrist incision, and the isolation plate is provided with a guide groove extending in the length direction of the isolation plate; the cutting knife comprises a handle, a knife connecting handle arranged at the end of the handle, two oppositely-arranged supporting blocks arranged at the end of the knife connecting handle and a blade arranged in the space between the two supporting blocks. The supporting block located on the lower side is installed in the guide groove in a guiding mode, and the supporting block located on the upper side is supported between the skin and the transverse wrist ligament. According to the carpal canal ligament cutting device, damage to other tissues caused by inclination of the cutting knife is avoided through the supporting effect of the guide groove on the supporting block on the lower side of the cutting knife, and the carpal canal ligament can be cut in the forward direction; the supporting block on the upper side is used for isolating the carpal canal ligament from the skin, the skin is effectively prevented from being cut by the blade, and secondary injury to a patient is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to surgical tool technical field, concretely relates to a wrist canal ligament cutting assembly. BACKGROUND

[0002] Wrist canal syndrome is a group of symptoms and signs that median nerve is compressed in wrist canal, belongs to the most common kind in peripheral nerve compression syndrome, when operation, need make a 1.5-2cm incision in the palmaris longus muscle side, near wrist transverse line, then cut off wrist transverse ligament with cutting knife to release wrist canal. But in the process of resection, it is easy to cut the median nerve of patient, thumb long flexor tendon, finger superficial flexor tendon, finger deep flexor tendon and cause secondary injury to patient. CONTENT

[0003] The utility model aims at overcoming the defects of easy secondary injury to patient in the operation process in prior art, and provides a wrist canal ligament cutting assembly which is safe and reliable and can realize rapid operation.

[0004] The utility model adopts the technical scheme that:

[0005] A wrist canal ligament cutting assembly, comprising: a cutting knife and a guide knife rod, the guide knife rod comprises an isolation plate inserted between the wrist transverse ligament and the median nerve in the wrist incision, the isolation plate is provided with a guide groove extending along the length direction thereof; the cutting knife comprises a handle, a connecting knife handle arranged at the end of the handle, two opposite supporting blocks arranged at the end of the connecting knife handle and a knife blade arranged in the space between the two supporting blocks; the supporting block on the lower side is guided and installed in the guide groove, and the supporting block on the upper side is supported between the skin and the wrist transverse ligament.

[0006] Further, the knife blade is integrally formed with the connecting knife handle and the supporting blocks, and the front end of the knife blade is provided with a knife edge.

[0007] Further, an installation groove is arranged on the end face of the connecting knife handle between the two supporting blocks, and the knife blade is detachably installed in the installation groove.

[0008] Further, the cross section of the guide groove is inverted triangular or isosceles trapezoidal.

[0009] Further, the wrist canal ligament cutting assembly further comprises a reamer inserted into the incision to expand the channel after the wrist incision, the reamer comprises two opposite semicircular handle portions and two opposite semicircular reaming portions located at the front end of the semicircular handle portions; one side of the semicircular reaming portions is open, and the other side is rotationally connected.

[0010] Further, the reamer is made of medical plastic, and one side of the semicircular reaming portions is integrally connected through a plastic connecting rib.

[0011] Further, a plurality of auxiliary rotating shafts are arranged at one side between the two semi-circular reaming parts and are arranged on the same axis, and the two semi-circular reaming parts and the auxiliary rotating shafts are connected through plastic connecting ribs.

[0012] Further, the end of the semi-circular handle part away from the semi-circular reaming part is provided with an operation cutting surface, and the operation cutting surfaces of the two semi-circular handle parts are oppositely arranged, so that an operation space is left for a doctor to outwardly pinch the semi-circular handle part to realize reaming.

[0013] Further, the end of the semi-circular reaming part is provided with a guide circular arc tip.

[0014] The wrist ligament cutting assembly has the following beneficial effects:

[0015] 1. The guiding groove supports the lower side of the support block of the cutting knife, avoids damage to other tissues caused by the inclination of the cutting knife, and can cut the wrist ligament in a forward direction. The upper side of the support block is used to isolate the wrist ligament from the skin, effectively avoiding the cutting of the skin by the blade and causing secondary damage to the patient.

[0016] 2. The reamer of the utility model is first inserted from the incision in the closed state of the two semi-circular reaming parts to form a channel; after being inserted to a suitable position, the doctor expands the channel by pinching the two semi-circular handle parts to the two sides, pulls out the reamer after expanding the channel, and inserts the guide rod into the channel with sufficient space. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be further described in detail in combination with the drawings and specific embodiments.

[0018] Figure 1 is the overall structure diagram of the embodiment 1 of the utility model;

[0019] Figure 2 is the guide rod structure diagram of the embodiment 2 of the utility model;

[0020] Figure 3 is the cutting knife structure diagram of the embodiment 1 of the utility model;

[0021] Figure 4 is the upper perspective view of the reamer of the embodiment 1 of the utility model;

[0022] Figure 5 is the lower perspective view of the reamer of the embodiment 1 of the utility model;

[0023] Figure 6 is the cutting knife structure diagram of the embodiment 2 of the utility model;

[0024] Figure 7 is the reamer structure diagram of the embodiment 3 of the utility model.

[0025] In the figure: 1, cutting knife, 11, handle, 12, connecting handle, 13, supporting block, 14, blade, 15, mounting groove, 2, guide knife rod, 21, isolation plate, 22, guide groove, 3, reamer, 31, semicircular handle part, 32, semicircular reaming part, 33, plastic connecting rib, 34, auxiliary rotating shaft, 35, operation cutting surface, 36, guide circular arc tip. DETAILED DESCRIPTION

[0026] The utility model will be explained in further detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only schematically show the basic structure of the utility model, so they only show the structure related to the utility model.

[0027] Example 1

[0028] As Figures 1-5 shown in a specific embodiment of the wrist ligament cutting assembly of the utility model, the wrist ligament cutting assembly comprises a reamer 3, a guide knife rod 2 and a cutting knife 1. During surgery, a 1.5-2cm incision is made near the palmaris longus muscle side and the wrist transverse line, and the reamer 3 is inserted into the incision to ream to provide a sufficient insertion channel for the guide knife rod 2. Specifically, the reamer 3 is seen from Figure 4 and Figure 5 , the reamer 3 comprises two oppositely arranged semicircular handle parts 31 and two oppositely arranged semicircular reaming parts 32 located at the front ends of the semicircular handle parts 31. One side of the two semicircular reaming parts 32 is open, and the other side is rotationally connected. In this embodiment, a plurality of auxiliary rotating shafts 34 are arranged on one side between the two semicircular reaming parts 32 and located on the same axis, and the two semicircular reaming parts 32 and the auxiliary rotating shafts 34 are connected through plastic connecting ribs 33. The reamer 3 as a whole is made of medical plastic.

[0029] In this embodiment, the end of the semicircular reaming part 32 has a guide circular arc tip 36, which can better prop the skin at the front end outward.

[0030] In this embodiment, the end of the semicircular handle part 31 away from the semicircular reaming part 32 has an operation cutting surface 35, and the operation cutting surfaces 35 of the two semicircular handle parts 31 are oppositely arranged, leaving operation space for the doctor to outwardly pry the semicircular handle part 31 to achieve reaming. The reamer 3 is first inserted from the incision in the closed state of the two semicircular reaming parts 32 to form a channel; after being inserted to a suitable position, the doctor expands the channel by prying the operation cutting surfaces 35 of the two semicircular handle parts 31 on both sides, and then pulls out the reamer 3 after expanding the channel to provide sufficient space for the guide knife rod 2 to be inserted into the channel.

[0031] Referring to Figure 2The guide bar 2 comprises a partition plate 21 inserted between the transverse carpal ligament and the median nerve in the wrist incision, and the partition plate 21 is provided with a guide groove 22 extending along the length direction of the partition plate 21.

[0032] Referring to Figure 3 The cutting knife 1 comprises a handle 11, a connecting knife handle 12 arranged at the end of the handle 11, two opposite support blocks 13 arranged at the end of the connecting knife handle 12, and a blade 14 arranged in the space between the two support blocks 13. In this embodiment, the blade 14 is integrally formed with the connecting knife handle 12 and the support blocks 13, the blade is arranged across between the two support blocks 13, and the front end of the blade 14 is provided with a knife edge.

[0033] The lower support block 13 is guided and arranged in the guide groove 22, and the upper support block 13 is supported between the skin and the transverse carpal ligament. The cross section of the guide groove 22 is in the shape of an inverted triangle or an isosceles trapezoid, and the design of the inverted triangle or the isosceles trapezoid enables the guide groove 22 to be adapted to cutting knives 1 of various sizes and specifications.

[0034] The surgical process of the utility model is as follows: first, a 1.5-2 cm incision is made near the palmaris longus muscle and the transverse carpal line, the reamer 3 is inserted into the incision in the closed state of the two half-circle reaming portions 32 to form a channel, after being inserted into the appropriate position, the doctor expands the channel by operating the cutting surface 35 of the two half-circle handle portions 31 to the two sides, and then pulls out the reamer 3 after expanding the channel; then, the guide bar 2 is inserted into the appropriate position; the doctor inserts the lower support block 13 at the front end of the handle 11 of the cutting knife 1 into the guide groove 22 and slowly moves forward in the guide groove 22, at this time, the upper support block 13 abuts against the upper skin, so that the skin is separated from the carpal ligament, when the vertically extending blade 14 moves to the carpal ligament to cut and break the carpal ligament, the operation of releasing the carpal transverse ligament is completed, and finally, the incision is sutured to complete the operation.

[0035] Embodiment 2

[0036] Referring to Figure 6 The difference between this embodiment and embodiment 1 is that the setting mode of the blade 14 of the cutting knife 1, in this embodiment, the end face of the connecting knife handle 12 between the two support blocks 13 is provided with a mounting groove 15, and the blade 14 is detachably arranged in the mounting groove 15. The detachable design of the blade 14 enables the blade 14 to be discarded after one operation is completed, and the main part of the cutting knife 1 can be reused after being sterilized.

[0037] Embodiment 3

[0038] Referring to Figure 7 The difference between this embodiment and embodiment 1 is that the reamer 3 in this embodiment is made of medical plastic, and one side of the two half-circle reaming portions 32 is integrally connected through the plastic connecting rib 33.

[0039] It should be understood that the above-described embodiments are merely for the purpose of interpretation of the present application and are not intended to limit the present application. The obvious changes or modifications derived from the spirit of the present application are still within the scope of protection of the present application.

Claims

1. A carpal tunnel ligament cutting assembly, characterized in that, The application relates to a reamer (3), a cutting knife (1) and a guide knife rod (2) which are inserted into a wrist incision to expand the channel; the reamer (3) comprises two oppositely arranged semicircular handle portions (31) and two oppositely arranged semicircular reaming portions (32) located at the front ends of the semicircular handle portions (31); one side of the semicircular reaming portions (32) is open, and the other side is rotationally connected; the end of the semicircular handle portion (31) away from the semicircular reaming portion (32) is provided with an operation cutting surface (35), the operation cutting surfaces (35) of the two semicircular handle portions (31) are oppositely arranged, and the semicircular handle portions (31) are outwardly pried by a doctor to realize reaming and leave an operation space; the guide knife rod (2) comprises an isolation plate (21) inserted between the transverse ligament of the wrist and the median nerve in the wrist incision, the isolation plate (21) is provided with a guide groove (22) extending along the length direction of the isolation plate (21), the guide groove (22) is in the shape of an inverted triangle or an isosceles trapezoid in cross section; the cutting knife (1) comprises a handle (11), a connecting knife handle (12) arranged at the end of the handle (11), two oppositely arranged supporting blocks (13) arranged at the end of the connecting knife handle (12) and a blade (14) arranged in the space between the two supporting blocks (13); the lower supporting block (13) is guided to be arranged in the guide groove (22), and the upper supporting block (13) is supported between the skin and the transverse ligament of the wrist. The blade (14) is integrally formed with the connecting knife handle (12) and the supporting blocks (13), and the front end of the blade (14) is provided with a cutting edge.

2. A carpal ligament sectioning assembly according to claim 1, wherein, The end surface of the connecting knife handle (12) between the two supporting blocks (13) is provided with a mounting groove (15), and the blade (14) is detachably arranged in the mounting groove (15).

3. A carpal ligament sectioning assembly according to claim 1, wherein, The reamer (3) is made of medical plastic, and the two semicircular reaming portions (32) are integrally connected through plastic connecting ribs (33) on one side.

4. A carpal ligament sectioning assembly according to claim 1, wherein, A plurality of auxiliary rotating shafts (34) are arranged on one side between the two semicircular reaming portions (32) and located on the same axis, and the semicircular reaming portions (32) and the auxiliary rotating shafts (34) are connected through the plastic connecting ribs (33).

5. A carpal ligament cutting assembly according to claim 1, wherein, The end of the semicircular reaming portion (32) is provided with a guide circular arc tip (36).

6. A carpal ligament sectioning assembly according to any one of claims 1-5, wherein, ​

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