Stable transmission assembly for ultrasonic knife

Abstract

The utility model relates to a stable transmission component for ultrasonic knife, it includes wrench, transmission arm, transmission rack, transmission gear, cooperation gear, cooperation rack, be equipped with first hinge plate on the wrench, first hinge plate with handle shell hinge, transmission rack is fixed connection on the wrench, transmission gear and cooperation gear are both rotatingly arranged in handle shell, cooperation rack is equipped with cooperation rack. The transmission gear is meshed with the transmission rack, the matching gear is meshed with the transmission gear, the matching rack is fixed on the transmission arm, and the matching rack is meshed with the matching gear; the transmission gear is detachably connected with the handle shell through a connecting assembly, and the matching gear is detachably connected with the handle shell through a connecting assembly. The transmission stability and the displacement precision of the transmission arm are improved to accurately control the clamping force of the tool bit, so that the clamping precision of the tool bit in the operation process is improved, and the control difficulty of clamping of the tool bit is reduced.

Description

Technical Field

[0001] The utility model relates to the field of ultrasonic scalpels, in particular to a stable transmission component for an ultrasonic scalpel. Background Technique

[0002] An ultrasonic scalpel is a medical device that converts electrical energy into mechanical energy through a transducer, and then amplifies and transmits the amplitude to the tool head through a horn to cut tissue and coagulate blood. This device mainly works by using mechanical impact, cavitation effect and thermal effect generated by high-frequency vibration. Compared with traditional surgical methods, since the ultrasonic scalpel can coagulate blood while cutting the target tissue, the wound it generates is smaller, which is beneficial to the rapid recovery of patients in the later stage. Therefore, ultrasonic scalpel surgery is more and more widely used in various surgeries.

[0003] Refer to the attached Figure 1 and the attached Figure 2 , for the existing ultrasonic scalpels on the market currently, the ultrasonic scalpel mainly includes an ultrasonic generator, a transducer, a handle and a tool head 1. A transmission component 3 for transmitting the opening and closing movement of the handle to the tool rod 11 assembly is arranged inside the handle. The tool head 1 is arranged at the front end of the ultrasonic scalpel. The tool head 1 includes a tool rod 11 for clamping tissue and a clamp head 12. A transmission component 3 is arranged inside the handle at the rear end of the ultrasonic scalpel. The tool rod 11 is connected to the transmission component 3 through an inner sleeve 111. The tool rod 11 is fixedly connected to the inner sleeve 111 and slides with the inner sleeve 111. The clamp head 12 is connected to the handle housing 2 through an outer sleeve 121. One end of the clamp head 12 close to the outer sleeve 121 is hinged to the inner sleeve 111 and the outer sleeve 121 at the same time. The outer sleeve 121 is fixedly connected to the handle housing 2. The inner sleeve 111 is slidably connected to the outer sleeve 121. The clamp head 12 swings around the hinge point with the outer sleeve 121. The tail end of the inner sleeve 111 passes through the handle housing 2 and is fixedly connected with a drag seat 112. A corrugated spring 113 is sleeved on the drag seat 112.

[0004] The transmission component 3 includes a wrench 31, a connecting rod 32, and a transmission arm 33. A first hinge plate 311 and a second hinge plate 312 are arranged on the wrench 31. The first hinge plate 311 is hinged to the handle housing 2. The second hinge plate 312 is hinged to one end of the connecting rod 32. The other end of the connecting rod 32 is hinged to the transmission arm 33. The transmission arm 33 is connected to the corrugated spring 113 and drives the corrugated spring 113 to move. When pressing the wrench 31, the wrench 31 drives the transmission arm 33 to move towards the rear end of the ultrasonic scalpel through the connecting rod 32. When the corrugated spring 113 moves towards the rear end of the ultrasonic scalpel, the corrugated spring 113 drives the drag seat 112 to move towards the rear end of the ultrasonic scalpel. The drag seat 112 drives the inner sleeve 111 to move towards the rear end of the ultrasonic scalpel, so that the clamp head 12 rotates towards the direction close to the tool rod 11 to realize clamping of tissue.

[0005] A return spring 4 is provided at the tail of the transmission arm 33. The return spring 4 applies a force to the transmission arm 33 to move the transmission arm 33 towards the front end of the ultrasonic knife. After pressing the wrench 31, the return spring 4 is compressed. After releasing the wrench 31, the return spring 4 pushes the transmission arm 33 towards the front end of the ultrasonic knife to reset the tool head 1.

[0006] For the above-mentioned transmission assembly, during the operation, it is necessary to keep pressing the wrench to control the clamping of the tool head. If the clamping force of the ultrasonic knife tool head is too small, it is difficult to clamp the tissue, which prolongs the time for cutting and hemostasis and reduces the cutting efficiency. If the clamping force of the ultrasonic knife tool head is too large and the tissue is clamped too tightly, it will cause greater thermal damage to the ultrasonic knife. After pressing the wrench, the wrench directly drives the transmission arm to move through the connecting rod, and the transmission is unstable and prone to poor displacement accuracy of the transmission arm, which is not convenient for accurately controlling the clamping force, resulting in low clamping accuracy of the tool head and great control difficulty during the operation, thereby reducing the operation accuracy of the ultrasonic knife operation and the postoperative recovery effect. Utility Model Content

[0007] In order to solve the above technical problems, the present application provides a stable transmission assembly for an ultrasonic knife.

[0008] The stable transmission assembly for an ultrasonic knife provided by the present application adopts the following technical solutions:

[0009] A stable transmission assembly for an ultrasonic knife includes a wrench, a transmission arm, a transmission rack, a transmission gear, a mating gear, and a mating rack. A first hinge plate is provided on the wrench, and the first hinge plate is hinged to the handle housing. The transmission rack is fixedly connected to the wrench. The transmission gear and the mating gear are both rotatably arranged in the handle housing. The transmission gear meshes with the transmission rack, the mating gear meshes with the transmission gear, the mating rack is fixed to the transmission arm, and the mating rack meshes with the mating gear;

[0010] The transmission gear is detachably connected to the handle housing, and the mating gear is detachably connected to the handle housing through a connection assembly.

[0011] By adopting the above technical solutions, after pressing the wrench, the transmission rack drives the transmission gear to rotate counterclockwise, the transmission gear drives the mating gear to rotate clockwise, the mating gear rotates to drive the mating rack to move backward tooth by tooth, and the mating rack drives the transmission arm to move towards the rear end of the ultrasonic knife, improving the stability of the transmission and the displacement accuracy of the transmission arm, accurately controlling the clamping force of the tool head, thereby improving the clamping accuracy of the tool head during the operation and reducing the control difficulty of the tool head clamping; when the tissue is too thick, a larger clamping force can be selected; when the tissue is thinner, a smaller clamping force can be selected, improving the cutting efficiency and not causing greater thermal damage to the tool head.

[0012] Preferably, the diameter of the transmission gear is smaller than that of the mating gear.

[0013] By adopting the above technical solution, the space occupied by the transmission gear is saved.

[0014] Preferably, the connection assembly includes a fixed sleeve, a connecting shaft, and a limiting plate. The fixed sleeve is fixedly connected to the inner wall of the handle housing. One end of the connecting shaft penetrates into the fixed sleeve and is rotatably connected to the fixed sleeve. A limiting strip is provided on the outer peripheral wall of the part of the connecting shaft outside the fixed sleeve, and the length direction of the limiting strip is arranged along the axial direction of the connecting shaft. Connecting holes for the connecting shaft to pass through are provided on both the transmission gear and the mating gear, and a limiting groove for the limiting strip to pass through is provided on the inner peripheral wall of the connecting hole;

[0015] The limiting plate is rotatably arranged on the side of the connecting shaft away from the fixed sleeve. The side of the limiting plate close to the fixed sleeve is in contact with the side of the corresponding transmission gear away from the fixed sleeve and the side of the mating gear away from the fixed sleeve. A positioning shaft is connected to the side of the limiting plate close to the connecting shaft, and a positioning groove for the positioning shaft to penetrate into is provided on the connecting shaft, and the positioning shaft rotates in the positioning groove.

[0016] By adopting the above technical solution, when installing the transmission gear or the mating gear, the connecting shaft is passed through the connecting hole of the corresponding transmission gear or mating gear bed, and the limiting strip is passed through the limiting groove. Finally, the limiting plate is rotated until the side of the limiting plate close to the fixed sleeve is in contact with the side of the corresponding transmission gear away from the fixed sleeve and the side of the mating gear away from the fixed sleeve to fix the corresponding transmission gear and mating gear, and the installation is fast.

[0017] Preferably, a connecting ring plate is coaxially connected to the outer peripheral wall of one end of the connecting shaft located inside the fixed sleeve, and a connecting ring groove for the connecting ring plate to rotate is provided on the inner peripheral wall of the fixed sleeve.

[0018] By adopting the above technical solution, when the connecting shaft rotates inside the fixed sleeve, the connecting ring plate rotates in the connecting ring groove, so that while the connecting shaft can rotate, the axial movement of the connecting shaft is restricted.

[0019] Preferably, a positioning ring plate is coaxially connected to the outer peripheral wall of one end of the positioning shaft located inside the positioning groove, a positioning ring groove for the positioning ring plate to rotate is provided on the inner wall of the positioning groove, and a friction layer is provided on the outer surface of the positioning ring plate.

[0020] By adopting the above technical solution, when the limiting plate is rotated, the positioning shaft rotates in the positioning groove, the positioning ring plate rotates in the positioning ring groove, and the friction layer provided on the outer surface of the positioning ring plate increases the friction between the positioning ring plate and the inner peripheral wall of the positioning ring groove, so that the limiting plate remains stable without external force and avoids the limiting plate from separating from the corresponding transmission gear and mating gear.

[0021] Preferably, a limiting groove is formed on one side of the limiting plate close to the fixed sleeve, and limiting protrusions that are inserted into the corresponding limiting grooves are provided on one side of the transmission gear away from the fixed sleeve and on one side of the mating gear away from the fixed sleeve.

[0022] By adopting the above technical solution, the limiting plate is further kept stable without external force, and the limiting plate is further prevented from detaching from the corresponding transmission gear and mating gear.

[0023] Preferably, a receiving groove is formed on the inner wall of the positioning groove, a locking rod is slidably arranged in the receiving groove, a locking groove for the locking rod to penetrate into is formed on the outer peripheral wall of the positioning shaft, one end of the locking rod close to the locking groove is arc-shaped, a pressing spring is further arranged in the receiving groove, one end of the pressing spring is fixedly connected with the locking rod, the other end of the pressing spring is fixedly connected with the inner wall of the receiving groove, and the pressing spring applies a force to the locking rod to make the locking rod slide towards the inside of the locking groove;

[0024] When the limiting protrusion is clamped in the limiting groove, the locking rod penetrates into the corresponding locking groove.

[0025] By adopting the above technical solution, the limiting plate is further kept stable without external force, and the limiting plate is further prevented from detaching from the corresponding transmission gear and mating gear. After an external force is applied to the limiting plate, the locking rod disengages from the locking groove and the limiting protrusion disengages from the limiting groove, and then the limiting plate can be rotated to disengage from the corresponding transmission gear and mating gear.

[0026] Preferably, an L-shaped plate is further arranged on the outer peripheral wall of the connecting shaft, the horizontal section of the L-shaped plate is fixedly connected with the outer wall of the connecting shaft, and a card slot for the vertical section of the L-shaped plate to penetrate into is formed on one side of the transmission gear close to the fixed sleeve and on one side of the mating gear close to the fixed sleeve.

[0027] By adopting the above technical solution, the vertical section of the L-shaped plate penetrates into the transmission gear and the mating gear, avoiding direct contact between the transmission gear and the mating gear and the corresponding fixed sleeve, and reducing the wear of the transmission gear and the mating gear.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. After pressing the wrench, the transmission rack drives the transmission gear to rotate counterclockwise. The transmission gear drives the mating gear to rotate clockwise. The rotation of the mating gear drives the mating rack to move backward tooth by tooth. The mating rack drives the transmission arm to move towards the rear end of the ultrasonic scalpel, improving the stability of the transmission and the displacement accuracy of the transmission arm, precisely controlling the clamping force of the tool head, thus improving the clamping accuracy of the tool head during the operation and reducing the control difficulty of the tool head clamping. When the tissue is too thick, a larger clamping force can be selected; when the tissue is thinner, a smaller clamping force can be selected, improving the cutting efficiency and not causing significant thermal damage to the tool head.

[0030] 2. When installing the transmission gear or the mating gear, pass the connecting shaft through the connecting hole of the corresponding transmission gear or the mating gear bed, and make the limiting strip pass through the limiting groove. Finally, rotate the limiting plate until the side of the limiting plate close to the fixed sleeve fits with the side of the corresponding transmission gear away from the fixed sleeve and the side of the mating gear away from the fixed sleeve to fix the corresponding transmission gear and mating gear, and the installation is fast. Brief Description of the Drawings

[0031] Figure 1 is a schematic structural diagram for showing the ultrasonic scalpel after opening the handle housing in the prior art.

[0032] Figure 2 is Figure 1 the enlarged view of part A in

[0033] Figure 3 is the overall structural schematic diagram of a stable transmission assembly for an ultrasonic scalpel after opening the handle housing in an embodiment of the present application.

[0034] Figure 4 is the schematic structural diagram for showing the connection assembly after hiding the transmission gear and the mating gear in an embodiment of the present application.

[0035] Figure 5 is the schematic cross-sectional structural diagram for showing the connection assembly taking the transmission gear as an example in an embodiment of the present application. The connection relationship between the mating gear and the connection assembly is the same as that between the transmission gear and the connection assembly.

[0036] Figure 6 is Figure 5 the enlarged view of part B in

[0037] Description of reference numerals: 1. Knife head; 11. Knife rod; 111. Inner sleeve; 112. Drag seat; 113. Wave spring; 12. Plier head; 121. Outer sleeve; 2. Handle housing; 3. Transmission assembly; 31. Wrench; 311. First hinge plate; 312. Second hinge plate; 32. Connecting rod; 33. Transmission arm; 34. Transmission rack; 35. Transmission gear; 36. Matching gear; 37. Matching rack; 4. Return spring; 5. Connecting assembly; 51. Fixed sleeve; 511. Connecting ring groove; 52. Connecting shaft; 521. Limit strip; 522. Connecting ring plate; 523. Positioning groove; 5231. Positioning ring groove; 524. L-shaped plate; 5241. Card slot; 53. Limit plate; 531. Limit groove; 6. Connecting hole; 61. Limit groove; 7. Positioning shaft; 71. Positioning ring plate; 72. Locking groove; 8. Limit projection; 9. Accommodating groove; 91. Locking rod; 92. Tightening spring. Detailed implementation manners

[0038] The following will further describe the present application in detail with reference to the Figures 3 - 6 accompanying drawings.

[0039] An embodiment of the present application discloses a stable transmission assembly for an ultrasonic knife.

[0040] Referring to Figures 3 - 6 , the stable transmission assembly for an ultrasonic knife includes a wrench 31, a transmission arm 33, a transmission rack 34, a transmission gear 35, a matching gear 36, and a matching rack 37. A first hinge plate 311 is provided on the wrench 31, and the first hinge plate 311 is hinged to the handle housing 2. The transmission rack 34 is fixedly connected to the wrench 31. The transmission gear 35 and the matching gear 36 are both rotatably arranged in the handle housing 2. The transmission gear 35 meshes with the transmission rack 34, the matching gear 36 meshes with the transmission gear 35, the matching rack 37 is fixed to the transmission arm 33, and the matching rack 37 meshes with the matching gear 36.

[0041] After pressing the wrench 31, the transmission rack 34 drives the transmission gear 35 to rotate counterclockwise, the transmission gear 35 drives the matching gear 36 to rotate clockwise, the matching gear 36 rotates to drive the matching rack 37 to move backward tooth by tooth, and the matching rack 37 drives the transmission arm 33 to move toward the rear end of the ultrasonic knife, improving the stability of the transmission and the displacement accuracy of the transmission arm 33, precisely controlling the clamping force of the knife head 1, thereby improving the clamping accuracy of the knife head 1 during the operation and reducing the control difficulty of the clamping of the knife head 1. When the tissue is too thick, a larger clamping force can be selected; when the tissue is thinner, a smaller clamping force can be selected, improving the cutting efficiency and not causing great thermal damage to the knife head 1.

[0042] The diameter of the transmission gear 35 is smaller than that of the matching gear 36, saving the space occupied by the transmission gear 35.

[0043] The transmission gear 35 and the handle housing 2, and the mating gear 36 and the handle housing 2 are both detachably connected through the connecting assembly 5.

[0044] There are two handle housings 2. After the two handle housings 2 are assembled, they form the housing of the overall handle. There is a space between the two handle housings 2 for installing the transmission assembly 3 and the connecting assembly 5.

[0045] The connecting assembly 5 includes a fixing sleeve 51, a connecting shaft 52, and a limiting plate 53. The fixing sleeve 51 is fixedly connected to the inner wall of the handle housing 2 on one side. One end of the connecting shaft 52 penetrates into the fixing sleeve 51 and is rotatably connected to the fixing sleeve 51. A limiting strip 521 is provided on the outer peripheral wall of the part of the connecting shaft 52 outside the fixing sleeve 51. The limiting strips 521 are symmetrically arranged on both sides of the radial direction of the connecting shaft 52. The length direction of the limiting strip 521 is arranged along the axial direction of the connecting shaft 52. Connecting holes 6 for the connecting shaft 52 to pass through are provided on both the transmission gear 35 and the mating gear 36, and a limiting groove 61 for the limiting strip 521 to pass through is provided on the inner peripheral wall of the connecting hole 6.

[0046] A connecting ring plate 522 is coaxially connected to the outer peripheral wall of one end of the connecting shaft 52 located inside the fixing sleeve 51. A connecting ring groove 511 for the connecting ring plate 522 to rotate is provided on the inner peripheral wall of the fixing sleeve 51. When the connecting shaft 52 rotates inside the fixing sleeve 51, the connecting ring plate 522 rotates inside the connecting ring groove 511, so that while the connecting shaft 52 can rotate, the axial movement of the connecting shaft 52 is restricted.

[0047] The limiting plate 53 is rotatably arranged on the side of the connecting shaft 52 away from the fixing sleeve 51. The side of the limiting plate 53 close to the fixing sleeve 51 is in contact with the side of the corresponding transmission gear 35 away from the fixing sleeve 51 and the side of the mating gear 36 away from the fixing sleeve 51.

[0048] A positioning shaft 7 is fixedly connected to the side of the limiting plate 53 close to the connecting shaft 52. A positioning groove 523 for the positioning shaft 7 to penetrate into is provided on the connecting shaft 52, and the positioning shaft 7 rotates inside the positioning groove 523.

[0049] A positioning ring plate 71 is coaxially connected to the outer peripheral wall of one end of the positioning shaft 7 located inside the positioning groove 523. A positioning ring groove 5231 for the positioning ring plate 71 to rotate is provided on the inner wall of the positioning groove 523. A friction layer is provided on the outer surface of the positioning ring plate 71. In this embodiment, the friction layer is made of rubber material. When the limiting plate 53 is rotated, the positioning shaft 7 rotates inside the positioning groove 523, and the positioning ring plate 71 rotates inside the positioning ring groove 5231. The friction layer provided on the outer surface of the positioning ring plate 71 increases the friction between the positioning ring plate 71 and the inner peripheral wall of the positioning ring groove 5231, so that the limiting plate 53 remains stable without external force and prevents the limiting plate 53 from separating from the corresponding transmission gear 35 and mating gear 36.

[0050] On one side of the limit plate 53 close to the fixed sleeve 51, a limit groove 531 is provided. On the side of the transmission gear 35 away from the fixed sleeve 51 and on the side of the mating gear 36 away from the fixed sleeve 51, a limit protrusion 8 that is snapped into the corresponding limit groove 531 is provided, further enabling the limit plate 53 to remain stable without external force and further preventing the limit plate 53 from detaching from the corresponding transmission gear 35 and mating gear 36.

[0051] On the inner wall of the positioning groove 523, a receiving groove 9 is provided. A locking rod 91 is slidably arranged in the receiving groove 9. On the outer peripheral wall of the positioning shaft 7, a locking groove 72 for the locking rod 91 to penetrate into is provided. One end of the locking rod 91 close to the locking groove 72 is arc-shaped. In the receiving groove 9, a pressing spring 92 is further provided. One end of the pressing spring 92 is fixedly connected to the locking rod 91, and the other end of the pressing spring 92 is fixedly connected to the inner wall of the receiving groove 9. The pressing spring 92 exerts a force on the locking rod 91 to make the locking rod 91 slide into the locking groove 72. When the limit protrusion 8 is snapped into the limit groove 531, the locking rod 91 penetrates into the corresponding locking groove 72, further enabling the limit plate 53 to remain stable without external force and further preventing the limit plate 53 from detaching from the corresponding transmission gear 35 and mating gear 36.

[0052] After applying an external force to the limit plate 53, the locking rod 91 disengages from the locking groove 72 and the limit protrusion 8 disengages from the limit groove 531, and then the limit plate 53 can be rotated to disengage from the corresponding transmission gear 35 and mating gear 36.

[0053] On the outer peripheral wall of the connecting shaft 52, an L-shaped plate 524 is further provided. The horizontal section of the L-shaped plate 524 is fixedly connected to the outer wall of the connecting shaft 52. On the side of the transmission gear 35 close to the fixed sleeve 51 and on the side of the mating gear 36 close to the fixed sleeve 51, a card slot 5241 for the vertical section of the L-shaped plate 524 to penetrate into is provided, preventing the transmission gear 35 and mating gear 36 from directly contacting the corresponding fixed sleeve 51 and reducing the wear of the transmission gear 35 and mating gear 36.

[0054] When installing the transmission gear 35 or mating gear 36, pass the connecting shaft 52 through the connecting hole 6 of the corresponding transmission gear 35 or mating gear 36, and make the limit strip 521 pass through the limit groove 61 and the vertical section of the L-shaped plate 524 penetrate into the corresponding card slot 5241. At this time, the side of the transmission gear 35 close to the fixed sleeve 51 and the side of the mating gear 36 close to the fixed sleeve 51 are both in contact with the horizontal section of the L-shaped plate 524. Finally, rotate the limit plate 53 until the side of the limit plate 53 close to the fixed sleeve 51 fits with the side of the corresponding transmission gear 35 away from the fixed sleeve 51 and the side of the mating gear 36 away from the fixed sleeve 51 to fix the corresponding transmission gear 35 and mating gear 36, and the installation is fast.

[0055] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A stable transmission assembly for an ultrasonic knife, characterized in that: The invention comprises a wrench (31), a transmission arm (33), a transmission rack (34), a transmission gear (35), a matching gear (36), and a matching rack (37); the wrench (31) is provided with a first hinge plate (311); the first hinge plate (311) is hinged to a handle housing (2); the transmission rack (34) is fixedly connected to the wrench (31); the transmission gear (35) and the matching gear (36) are both rotatably arranged in the handle housing (2); the transmission gear (35) is meshed with the transmission rack (34); the matching gear (36) is meshed with the transmission gear (35); the matching rack (37) is fixed to the transmission arm (33); and the matching rack (37) is meshed with the matching gear (36); The transmission gear (35) and the handle housing (2), as well as the matching gear (36) and the handle housing (2) are all detachably connected via a connecting assembly (5).

2. The stable transmission assembly for ultrasonic scalpel according to claim 1, characterized in that: The diameter of the transmission gear (35) is smaller than the diameter of the matching gear (36).

3. The stable transmission assembly for ultrasonic scalpel according to claim 1, characterized in that: The connecting assembly (5) comprises a fixing sleeve (51), a connecting shaft (52), and a limiting plate (53); the fixing sleeve (51) is fixedly connected to the inner wall of the handle housing (2); one end of the connecting shaft (52) penetrates into the fixing sleeve (51) and is rotatably connected to the fixing sleeve (51); a limiting strip (521) is arranged on the outer peripheral wall of the connecting shaft (52) located outside the fixing sleeve (51); the length direction of the limiting strip (521) is arranged along the axial direction of the connecting shaft (52); the transmission gear (35) and the matching gear (36) are both provided with a connecting hole (6) for the connecting shaft (52) to pass through; and a limiting groove (61) for the limiting strip (521) to pass through is arranged on the inner peripheral wall of the connecting hole (6); The limiting plate (53) is rotatably arranged on a surface of the connecting shaft (52) away from the fixing sleeve (51); a surface of the limiting plate (53) close to the fixing sleeve (51) is in contact with a surface of the corresponding transmission gear (35) away from the fixing sleeve (51) and a surface of the matching gear (36) away from the fixing sleeve (51); a surface of the limiting plate (53) close to the connecting shaft (52) is connected to a positioning shaft (7); a positioning groove (523) for the positioning shaft (7) to penetrate is provided on the connecting shaft (52); and the positioning shaft (7) rotates in the positioning groove (523).

4. The stable transmission assembly for ultrasonic scalpel according to claim 3, characterized in that: The connecting shaft (52) is coaxially connected to a connecting ring plate (522) on the outer peripheral wall of one end of the fixing sleeve (51), and a connecting ring groove (511) for the connecting ring plate (522) to rotate is provided on the inner peripheral wall of the fixing sleeve (51).

5. The stable transmission assembly for ultrasonic scalpel according to claim 3, characterized in that: A positioning ring plate (71) is coaxially connected to the outer peripheral wall of the positioning shaft (7) at one end of the positioning groove (523); a positioning ring groove (5231) for the positioning ring plate (71) to rotate is provided on the inner wall of the positioning groove (523); and a friction layer is provided on the outer surface of the positioning ring plate (71).

6. The stable transmission assembly for ultrasonic scalpel according to claim 3, characterized in that: A limiting groove (531) is provided on a surface of the limiting plate (53) close to the fixing sleeve (51), and limiting protrusions (8) which are inserted into corresponding limiting grooves (531) are provided on a surface of the transmission gear (35) away from the fixing sleeve (51) and on a surface of the matching gear (36) away from the fixing sleeve (51).

7. The stable transmission assembly for ultrasonic scalpel according to claim 6, characterized in that: An accommodating groove (9) is provided on the inner wall of the positioning groove (523), a locking rod (91) is slidably arranged in the accommodating groove (9), a locking groove (72) for the locking rod (91) to penetrate is provided on the outer peripheral wall of the positioning shaft (7), the locking rod (91) is arranged in an arc shape at one end close to the locking groove (72), a pressing spring (92) is also arranged in the accommodating groove (9), one end of the pressing spring (92) is fixedly connected to the locking rod (91), and the other end of the pressing spring (92) is fixedly connected to the inner wall of the accommodating groove (9), and the pressing spring (92) exerts a force on the locking rod (91) to make the locking rod (91) slide toward the locking groove (72); When the limiting protrusion (8) is locked in the limiting groove (531), the locking rod (91) penetrates into the corresponding locking groove (72).

8. The stable transmission assembly for ultrasonic scalpel according to claim 3, characterized in that: An L-shaped plate (524) is also provided on the outer peripheral wall of the connecting shaft (52), and the horizontal section of the L-shaped plate (524) is fixedly connected to the outer wall of the connecting shaft (52). A slot (5241) for the vertical section of the L-shaped plate (524) to penetrate is provided on a surface of the transmission gear (35) close to the fixed sleeve (51) and a surface of the matching gear (36) close to the fixed sleeve (51).

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