An electrosurgical instrument with an adjustable length

Abstract

The application discloses a length-adjustable electrosurgical instrument, characterized in that the length-adjustable electrosurgical instrument comprises a shell, a movable clamp head, a sleeve assembly and a first unlocking sleeve set; a muzzle is arranged on the shell; the sleeve assembly extends outward from the muzzle; the movable clamp head is movably connected to the end of the sleeve assembly; the first unlocking sleeve set comprises a sliding sleeve and a sleeve seat; one end of the sleeve assembly, which is away from the movable clamp head, is connected to the sliding sleeve; the sleeve seat is connected to the shell; the position of the sliding sleeve on the sleeve seat is adjustable, so that the length of the sleeve assembly extending outward from the muzzle can be adjusted. The length-adjustable electrosurgical instrument disclosed by the application can not only avoid the arm-lifting operation of medical staff and reduce the operation fatigue, but also eliminate the risk of hemostasis delay caused by instrument replacement and guarantee the safety of operation.

Description

Technical Field

[0001] This invention relates to the field of electrosurgical instruments, and more specifically to an adjustable-length electrosurgical instrument. Background Technology

[0002] A high-frequency electrosurgical unit (high-frequency surgical instrument) is an electrosurgical device that replaces a mechanical scalpel for tissue cutting. It heats the tissue by generating a high-frequency, high-voltage current at the tip of an effective electrode, thereby separating and coagulating the tissue, achieving the purpose of cutting and hemostasis.

[0003] In clinical use of laparoscopy, existing single-length instruments cannot be adapted to surgical sites of varying depths. When the target tissue is in a deeper location, a long-handled instrument is required, while when the target tissue is in a shallower location, using a long-handled instrument requires raising the arm, which increases the surgeon's fatigue and reduces the precision of the movements. If a short-handled instrument is used instead, the time difference caused by the instrument alternation can lead to delayed hemostasis, blurred surgical vision, and ultimately affect the safety and effectiveness of the surgery. Summary of the Invention

[0004] The purpose of this invention is to provide an electrosurgical instrument with adjustable length.

[0005] The adjustable-length electrosurgical instrument provided by the present invention includes a housing (4), a movable forceps (1), a cannula assembly (2), and a first unlocking kit; the housing (4) is provided with a muzzle (41); the cannula assembly (2) extends outward from the muzzle (41); the movable forceps (1) is movably connected to the end of the cannula assembly (2); the first unlocking kit includes a sliding sleeve and a sleeve base (75); one end of the cannula assembly (2) away from the movable forceps (1) is connected to the sliding sleeve; the sleeve base (75) is connected inside the housing (4); by adjusting the position of the sliding sleeve on the sleeve base (75), the length of the cannula assembly (2) extending outward from the muzzle (41) can be changed.

[0006] Preferably, the sliding sleeve includes a sleeve head (71); the sleeve head (71) includes a first ring body (711) and a retainer (713); the retainer (713) is a block structure, with both ends of its width extending outward to form symmetrically distributed protrusions (715); the protrusions (715) and the main body of the retainer (713) are an integral structure; the retainer (713) is fixed on the outer wall of the first ring body (711); the top of the sleeve (75) has a first sliding groove (751) along its length; multiple evenly distributed first protrusions (752) are provided on both sides of the first sliding groove (751), and the first protrusions (752) on both sides are symmetrical; each protrusion (715) abuts between two first protrusions (752) on the same side wall of the first sliding groove (751), and the width of the protrusion (715) matches the distance between the two first protrusions (752).

[0007] Preferably, the sliding sleeve further includes a first spring (76) and a ball (77); the bottom of the card holder (713) is provided with a first groove (714); one end of the first spring (76) abuts against the bottom of the first groove (714), and the other end abuts against the ball (77); the ball (77) protrudes outward from the first groove (714) and abuts against the first sliding groove (751).

[0008] Preferably, the sliding sleeve further includes a sleeve (72d), a second spring (74), and a first retaining ring (72b); the sleeve assembly (2) includes an inner tube (22) and an outer tube (21), the inner tube (22) passing through the outer tube (21); one end of the inner tube (22) is inserted into the sleeve (72d) and fixed to the sleeve (72d); a first baffle (72c) and a second baffle (72a) are respectively fixed to both ends of the sleeve (72d); the first retaining ring (72b) and the second spring (74) are both sleeved on the sleeve. The sleeve (72d) is used; the two ends of the second spring (74) abut against the first retaining ring (72b) and the first baffle (72c) respectively; a retaining ring (712) is provided on the inner wall of one end of the first ring body (711), and the retaining ring (712) and the first ring body (711) are an integral structure; the second baffle (72a) and the first retaining ring (72b) form a second sliding groove (72e); the retaining ring (712) is flat and has an annular structure; the retaining ring (712) slides on the second sliding groove (72e).

[0009] Preferably, the first unlocking kit further includes a self-reset button (73); the self-reset button (73) is fixed on the outer casing (4); the self-reset button (73) abuts against the first ring body (711).

[0010] Preferably, the adjustable-length electrosurgical instrument provided by the present invention further includes a second unlocking kit; the second unlocking kit includes a rotating wheel (62), a sleeve (61), a third spring (65), and a locking pin (64); the rotating wheel (62) is sleeved on the sleeve (61) and located at the muzzle (41); the sleeve (61) has a plurality of evenly distributed first locking holes (611); the distance between any two first locking holes (611) is adapted to the distance between any two first protrusions (752); the rotating wheel (62) has a second locking hole (621); the locking pin (64) passes through the first locking hole (611) and the second locking hole (621); a baffle (641) is fixed on the outer wall of the locking pin (64); the third spring (65) is sleeved on the locking pin (64) and located between the baffle (641) and the inner wall of the rotating wheel (62).

[0011] Preferably, the outer tube (21) has a through hole (211) at one end near the second baffle (72a); the inner tube (22) has a through hole (222) at one end near the second baffle (72a); by inserting a pin into the first locking hole (611) at the end of the sleeve (61), the first through hole (211) of the outer tube (21) and the second through hole (222) of the inner tube (22), the sleeve (61), the outer tube (21) and the inner tube (22) are locked together.

[0012] Preferably, a trigger (3) is hinged to the outer shell (4); a third sliding groove (42) is provided on the outer shell (4) for the sleeve (75) to slide in; the trigger (3) is hinged to the end of the sleeve (75) via a connecting rod (31); the second through hole (222) is a strip-shaped hole; the top of one end of the movable pliers (1) is hinged to the outer tube (21); a set of oppositely arranged sliding columns (11) is also fixed on the movable pliers (1); a strip-shaped fourth sliding groove (221) is provided near one end of the inner tube (22) and its position corresponds to the sliding column (11); the sliding column (11) slides in the fourth sliding groove (221).

[0013] Preferably, the length-adjustable electrosurgical instrument provided by the present invention further includes an ultrasonic catheter (9), a transducer assembly (5), and an energy switch (8); the ultrasonic catheter (9) passes through the inner tube (22); the ultrasonic catheter (9) is provided with a third through hole (91); the third through hole (91) and the first through hole (211) are coaxially arranged; the ultrasonic catheter (9) and the transducer assembly (5) are connected; one end away from the movable forceps head (1) is electrically connected to the transducer assembly (5) through a high-frequency connecting line; the transducer assembly (5) is slidably fitted with the outer shell (4); the energy switch (8) is disposed on the outer shell (4), the transducer assembly (5) is electrically connected to the energy switch (8), and the energy switch (8) is used to control the start or stop of the transducer assembly (5).

[0014] The adjustable-length electrosurgical instrument provided by this invention allows medical personnel to adjust the position of the sliding sleeve on the sleeve (75), thereby adjusting the length of the cannula assembly (2) extending outward from the nozzle (41). This facilitates the adjustment of the length of the cannula assembly (2) according to actual needs during surgery, without the need to change instruments, and directly adapts to target tissues of different depths. This avoids the need for medical personnel to raise their arms, reduces operational fatigue, eliminates the risk of delayed hemostasis caused by instrument replacement, and ensures surgical safety. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of the adjustable-length electrosurgical instrument provided by the present invention;

[0016] Figure 2 A schematic diagram of the internal structure of the adjustable-length electrosurgical instrument provided by the present invention;

[0017] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure;

[0018] Figure 4 for Figure 3 Enlarged structural diagram of section A in the middle;

[0019] Figure 5 for Figure 3 Enlarged structural diagram of section B in the middle;

[0020] Figure 6 for Figure 1 A magnified first-person view of the structure of section C;

[0021] Figure 7 for Figure 1 A magnified schematic diagram of the second-view structure of section C in the middle;

[0022] Figure 8 for Figure 1Enlarged structural diagram of section D in the middle;

[0023] Figure 9 for Figure 8 Internal structure diagram;

[0024] Figure 10 for Figure 9 A structural diagram without the matching head installed;

[0025] Figure 11 This is a first-view structural diagram of the headgear provided in an embodiment of the present invention;

[0026] Figure 12 This is a schematic diagram of the second-view structure of the hood provided in an embodiment of the present invention;

[0027] Figure 13 This is a schematic diagram of the structure of the sleeve provided in an embodiment of the present invention;

[0028] Figure 14 This is a schematic diagram of the assembly structure of the sliding sleeve and the bushing provided in an embodiment of the present invention;

[0029] Figure 15 This is a schematic diagram of the structure of the wheel provided in an embodiment of the present invention;

[0030] Figure 16 This is a schematic diagram of the outer tube provided in an embodiment of the present invention;

[0031] Figure 17 This is a schematic diagram of the inner tube provided in an embodiment of the present invention;

[0032] Figure 18 This is a schematic diagram of the assembly of the trigger and the sleeve provided in an embodiment of the present invention;

[0033] Figure 19 This is a partially enlarged cross-sectional structural diagram of the assembly of the trigger and the socket provided in an embodiment of the present invention.

[0034] Figure 20 This is a schematic diagram of the outer casing provided in an embodiment of the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] like Figure 1-20As shown, the adjustable-length electrosurgical instrument provided in this embodiment includes a housing 4, a movable forceps head 1, a cannula assembly 2, and a first unlocking kit. The housing 4 has a nozzle 41. The cannula assembly 2 extends outward from the nozzle 41. The movable forceps head 1 is movably connected to the end of the cannula assembly 2. The first unlocking kit includes a sliding sleeve and a sleeve base 75. The end of the cannula assembly 2 away from the movable forceps head 1 is connected to the sliding sleeve. The sleeve base 75 is connected inside the housing 4. By adjusting the position of the sliding sleeve on the sleeve base 75, the length of the cannula assembly 2 extending outward from the nozzle 41 can be changed. Those skilled in the art will understand that by adjusting the position of the sliding sleeve on the sleeve base 75, medical personnel can adjust the length of the cannula assembly 2 extending outward from the nozzle 41. This allows medical personnel to easily adjust the length of the cannula assembly 2 according to actual needs during surgery, without needing to change instruments, directly adapting to target tissues of different depths. This avoids the need for medical personnel to raise their arms, reduces operational fatigue, eliminates the risk of delayed hemostasis caused by instrument changes, and ensures surgical safety.

[0037] Furthermore, the sliding sleeve includes a sleeve head 71; the sleeve head 71 includes a first ring body 711 and a retainer 713; the retainer 713 is generally block-shaped, with both end faces extending outward along its width direction to form symmetrically distributed protrusions 715; the protrusions 715 and the main body of the retainer 713 are integrally formed; the retainer 713 is fixed to the outer wall of the first ring body 711; the top of the sleeve 75 has a first sliding groove 751 along its length direction; multiple evenly distributed first protrusions 752 are provided on both side walls of the first sliding groove 751, and the first protrusions 752 on both side walls are symmetrical; each protrusion 715 abuts between two first protrusions 752 on the same side wall of the first sliding groove 751, and the width of the protrusion 715 matches the distance between the two first protrusions 752. Those skilled in the art will understand that when the two protrusions 715 on the card holder 713 are engaged in the gaps at the same position on the two side walls of the first slide groove 751, the first protrusion 752 serves to limit the card holder 713. By pressing the first ring body 711, the protrusions 715 can slide out from between the two first protrusions 752, and the first ring body 711 can be moved back and forth. When it is moved to the appropriate position, the operator needs to lift the first ring body 711 until the protrusions 715 abut against the two first protrusions 752 again, thereby completing the length adjustment of the sleeve assembly 2.

[0038] Furthermore, the sliding sleeve also includes a first spring 76 and a ball bearing 77; the bottom of the retaining seat 713 is provided with a first groove 714; one end of the first spring 76 abuts against the bottom of the first groove 714, and the other end abuts against the ball bearing 77; the ball bearing 77 protrudes outward from the first groove 714 and abuts against the first sliding groove 751. Those skilled in the art will understand that the ball bearing 77 can improve the sliding efficiency of the sleeve head 71 on the first sliding groove 751, and the elastic force of the first spring 76 can push the retaining seat 713 upward, thereby automatically fixing the retaining seat 713 to the sleeve 75.

[0039] Furthermore, the sliding sleeve also includes a sleeve 72d, a second spring 74, and a first retaining ring 72b; the sleeve assembly 2 includes an inner tube 22 and an outer tube 21, with the inner tube 22 passing through the outer tube 21; one end of the inner tube 22 is inserted into the sleeve 72d and fixed thereto; a first baffle 72c and a second baffle 72a are fixed to both ends of the sleeve 72d respectively; the first retaining ring 72b and the second spring 74 are both sleeved on the sleeve 72d; both ends of the second spring 74 abut against the first retaining ring 72b and the first baffle 72c respectively; a retaining ring 712 is provided on the inner wall of one end of the first ring body 711, and the retaining ring 712 and the first ring body 711 are an integral structure; the second baffle 72a and the first retaining ring 72b form a second sliding groove 72e; the retaining ring 712 is flat and has an annular structure; the retaining ring 712 slides on the second sliding groove 72e. Those skilled in the art will understand that the retaining ring 712 is a flat ring design, so that when the retaining ring 712 slides up and down the second slide groove 72e, the retaining ring 712 is always engaged with the second slide groove 72e, thus ensuring that when the first ring 711 moves left and right, the sleeve 72d can move left and right synchronously.

[0040] Furthermore, the first unlocking kit also includes a self-reset button 73; the self-reset button 73 is fixed to the outer casing 4; the self-reset button 73 abuts against the first ring body 711. Those skilled in the art will understand that when the length of the sleeve assembly needs to be adjusted, the operator presses the self-reset button 73, which applies downward pressure to the first ring body 711, causing the retainer 713 to compress the first spring 76, and the ball 77 to retract into the first groove 714. At this time, the protrusion 715 disengages from the limiting position of the first protrusions 752 on both sides of the first slide groove 751. The operator pushes the sliding sleeve along the length direction of the first slide groove 751, causing the sleeve assembly 2 to move synchronously; when it moves to the target position, the self-reset button 73 is released, the first spring 76 returns to its deformation, pushes the retainer 713 upward, and the ball 77 protrudes again from the first groove 714 and abuts against the bottom of the first slide groove 751, while the protrusion 715 engages between the two first protrusions 752 at the corresponding positions. The self-reset button 73 is prior art and will not be described in detail here.

[0041] Furthermore, the height of the first protrusion 752 is set to 0.8-1.2mm, and the distance between two adjacent first protrusions 752 is set to 5-8mm to ensure that there is no lateral displacement after the protrusion 715 is engaged. Those skilled in the art will understand that the distance between two adjacent first protrusions 752 can be adjusted according to the actual surgical requirements. The ball bearing 77 ensures smooth sliding and enhances positioning stability through point contact with the first groove 751, preventing axial movement of the sleeve assembly 2 after adjustment.

[0042] Furthermore, the adjustable-length electrosurgical instrument provided in this embodiment also includes a second unlocking kit; the second unlocking kit includes a rotating wheel 62, a sleeve 61, a third spring 65, and a locking pin 64; the rotating wheel 62 is sleeved on the sleeve 61 and located at the muzzle 41; the sleeve 61 has a plurality of evenly distributed first locking holes 611; the distance between any two first locking holes 611 is adapted to the distance between any two first protrusions 752; the rotating wheel 62 has a second locking hole 621; the locking pin 64 passes through the first locking hole 611 and the second locking hole 621; a baffle 641 is fixed on the outer wall of the locking pin 64; the third spring 65 is sleeved on the locking pin 64 and located between the baffle 641 and the inner wall of the rotating wheel 62. Those skilled in the art will understand that when an operator pulls the locking pin 64 upwards and removes it from the first locking hole 611, the sleeve 61 can be unlocked by rotating it. After unlocking, the sleeve 61 can be adjusted in length along with the outer tube 21. At the same time, due to the spring force, the locking pin 64 is pressed tightly against the outer wall of the sleeve 61, so the rotating wheel 62 will not slip off the sleeve 61.

[0043] Furthermore, the outer tube 21 has a through hole 211 at one end near the second baffle 72a; the inner tube 22 has a through hole 222 at one end near the second baffle 72a; by inserting a pin into the first locking hole 611 at the end of the sleeve 61, the first through hole 211 of the outer tube 21, and the second through hole 222 of the inner tube 22, the sleeve 61, the outer tube 21, and the inner tube 22 are locked together. Those skilled in the art will understand that the pin enables synchronous movement of the sleeve 61, the outer tube 21, and the inner tube 22.

[0044] Furthermore, a trigger 3 is hinged to the outer casing 4; a third sliding groove 42 is provided on the outer casing 4 for the sleeve 75 to slide in; the trigger 3 is hinged to the end of the sleeve 75 via a connecting rod 31; the second through hole 222 is a strip-shaped hole; the top of one end of the movable pliers 1 is hinged to the outer tube 21; a set of oppositely arranged sliding pins 11 are also fixed on the movable pliers 1; a strip-shaped fourth sliding groove 221 corresponding to the sliding pins 11 is provided near one end of the inner tube 22; the sliding pins 11 slide in the fourth sliding groove 221. Those skilled in the art will understand that when the trigger 3 is pulled, the trigger 3 drives the sleeve 75 to move to the right in the horizontal direction, and the sleeve 75 in turn drives the sleeve head 71 to move in the horizontal direction. Since the outer tube 21 and the rotating wheel 62 are locked by a pin and the rotating wheel 62 is limited by the outer shell 4, the outer tube 21 will not move. However, the second through hole 222 of the inner tube 22 is a strip hole. At this time, the inner tube 22 will move to the right. The limit of the fourth sliding groove 221 will pull the sliding column 11 to move with it, so that the movable jaw 1 can rotate around the hinge point to close. When the trigger 3 is pressed, the second spring 74 is compressed. Therefore, the operator can know that the movable jaw 1 is in the clamping state by the change in the gripping force of the trigger 3.

[0045] Furthermore, the adjustable-length electrosurgical instrument provided in this embodiment also includes an ultrasonic catheter 9, a transducer assembly 5, and an energy switch 8; the ultrasonic catheter 9 passes through the inner tube 22; the ultrasonic catheter 9 is provided with a third through hole 91; the third through hole 91 and the first through hole 211 are coaxially arranged; the ultrasonic catheter 9 and the transducer assembly 5 are connected; one end away from the movable forceps head 1 is electrically connected to the transducer assembly 5 through a high-frequency connecting line; the transducer assembly 5 is slidably fitted with the outer shell 4; the energy switch 8 is disposed on the outer shell 4, and the transducer assembly 5 is electrically connected to the energy switch 8, which is used to control the start or stop of the transducer assembly 5. After the movable clamping head 1 closes and clamps the target tissue under the control of the trigger 3, the operator presses the energy switch 8 on the outer casing 4. The energy switch 8 sends a start signal to the transducer assembly 5. The transducer assembly 5 is connected to an external high-frequency power supply with a voltage of 220V and a current of 5-10A, generating high-frequency vibrations that are transmitted to the clamping head through the ultrasonic conduit 9, achieving tissue cutting or coagulation. When the energy switch 8 is released, the transducer assembly 5 is de-energized, and the vibration stops. Those skilled in the art will understand that the transducer assembly 5, the ultrasonic conduit 9, and the energy switch 8 are all prior art and will not be described in detail here.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrosurgical instrument of adjustable length, characterized in that, The utility model relates to a portable adjustable length telescopic pliers, including shell (4), movable pliers head (1), sleeve assembly (2) and first unlock suite, be equipped with muzzle (41) on shell (4), sleeve assembly (2) from muzzle (41) outwardly stretch, movable pliers head (1) is movably connected in the end of sleeve assembly (2), and first unlock suite includes slide sleeve and sleeve seat (75), sleeve assembly (2) is connected with slide sleeve away from movable pliers head (1) one end, and sleeve seat (75) is connected in shell (4), and the length of sleeve assembly (2) outwardly stretching from muzzle (41) can be changed by adjusting the position of slide sleeve on sleeve seat (75), The utility model relates to a portable adjustable length telescopic pliers, including shell (4), movable pliers head (1), sleeve assembly (2) and first unlock suite, be equipped with muzzle (41) on shell (4), sleeve assembly (2) from muzzle (41) outwardly stretch, movable pliers head (1) is movably connected in the end of sleeve assembly (2), and first unlock suite includes slide sleeve and sleeve seat (75), sleeve assembly (2) is connected with slide sleeve away from movable pliers head (1) one end, and sleeve seat (75) is connected in shell (4), and the length of sleeve assembly (2) outwardly stretching from muzzle (41) can be changed by adjusting the position of slide sleeve on sleeve seat (75), The utility model relates to a portable adjustable length telescopic pliers, including shell (4), movable pliers head (1), sleeve assembly (2) and first unlock suite, be equipped with muzzle (41) on shell (4), sleeve assembly (2) from muzzle (41) outwardly stretch, movable pliers head (1) is movably connected in the end of sleeve assembly (2), and first unlock suite includes slide sleeve and sleeve seat (75), sleeve assembly (2) is connected with slide sleeve away from movable pliers head (1) one end, and sleeve seat (75) is connected in shell (4), and the length of sleeve assembly (2) outwardly stretching from muzzle (41) can be changed by adjusting the position of slide sleeve on sleeve seat (75), The utility model relates to a portable adjustable length telescopic pliers, including shell (4), movable pliers head (1), sleeve assembly (2) and first unlock suite, be equipped with muzzle (41) on shell (4), sleeve assembly (2) from muzzle (41) outwardly stretch, movable pliers head (1) is movably connected in the end of sleeve assembly (2), and first unlock suite includes slide sleeve and sleeve seat (75), sleeve assembly (2) is connected with slide sleeve away from movable pliers head (1) one end, and sleeve seat (75) is connected in shell (4), and the length of sleeve assembly (2) outwardly stretching from muzzle (41) can be changed by adjusting the position of slide sleeve on sleeve seat (75), The outer tube (21) is provided with a first through hole (211) near one end of the second baffle (72a); the inner tube (22) is provided with a second through hole (222) near one end of the second baffle (72a); the sleeve (61), the outer tube (21) and the inner tube (22) are locked by inserting a pin into the first lock hole (611) at the end of the sleeve (61), the first through hole (211) of the outer tube (21) and the second through hole (222) of the inner tube (22); The outer shell (4) is hinged with a trigger (3); the outer shell (4) is provided with a third sliding groove (42) for sliding of the sleeve (75); the trigger (3) is hinged with the end of the sleeve (75) through a connecting rod (31); the second through hole (222) is a strip-shaped hole; the outer tube (21) is hinged with the top of one end of the movable plier head (1); the movable plier head (1) is further fixed with a set of oppositely arranged sliding columns (11); the inner tube (22) is provided with a strip-shaped fourth sliding groove (221) corresponding to the sliding columns (11) near one end thereof; the sliding columns (11) slide in the fourth sliding groove (221).

2. An electrosurgical instrument of adjustable length according to claim 1, wherein, The sliding sleeve further comprises a first spring (76) and a ball (77); the bottom of the clamping seat (713) is provided with a first recess (714); one end of the first spring (76) abuts against the bottom of the first recess (714), and the other end abuts against the ball (77); the ball (77) protrudes outward from the first recess (714) and abuts against the first sliding groove (751).

3. An electrosurgical instrument of adjustable length according to claim 2, wherein, The first stop ring (72b) and the second spring (74) are sleeved on the sleeve (72d); the two ends of the second spring (74) abut against the first stop ring (72b) and the first baffle (72c) respectively; the inner wall of one end of the first ring body (711) is provided with a clamping ring (712), and the clamping ring (712) and the first ring body (711) are an integral structure; the second baffle (72a) and the first stop ring (72b) enclose a second sliding groove (72e); the clamping ring (712) is flat and has a ring structure; the clamping ring (712) slides on the second sliding groove (72e).

4. An electrosurgical instrument of adjustable length according to claim 3, wherein, The first unlocking set further comprises a self-resetting button (73); the self-resetting button (73) is fixed on the outer shell (4); the self-resetting button (73) abuts against the first ring body (711).

5. An electrosurgical instrument of adjustable length according to claim 4, wherein, Further comprising an ultrasonic wave catheter (9), a transducer assembly (5) and an energy switch (8); the ultrasonic wave catheter (9) is arranged through the inner tube (22); the ultrasonic wave catheter (9) is provided with a third through hole (91); the third through hole (91) and the first through hole (211) are coaxially arranged; the ultrasonic wave catheter (9) is connected with the transducer assembly (5); the end away from the movable pliers head (1) is electrically connected with the transducer assembly (5) through a high-frequency connecting line; the transducer assembly (5) is arranged in sliding fit with the shell (4); the energy switch (8) is arranged on the shell (4), the transducer assembly (5) is electrically connected with the energy switch (8), and the energy switch (8) is used for controlling the start or stop of the transducer assembly (5).

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