Endoscopic surgical instrument

Abstract

The utility model relates to the technical field of medical instruments, and discloses an endoscopic surgical instrument, which comprises a handle and a cutter head, the handle comprises a handle shell, a trigger, a turntable, a transfer shaft, a pull wire and a rotary clamping sleeve, the handle shell is provided with a mounting cavity, one end of the cutter head is connected with the rotary clamping sleeve, and the other end of the cutter head is connected with the trigger. The rotating clamping sleeve is rotationally connected to the handle shell and located in the mounting cavity, the trigger is rotationally connected to the handle shell through a trigger rotating shaft and is in transmission connection with the rotating disc, and at least one part of the trigger is located outside the handle shell; the rotating disc is rotationally connected to the mounting cavity of the handle shell through a rotating disc rotating shaft, the pull wire is connected to the rotating disc and wound around the periphery of the rotating clamping sleeve through the middle rotating shaft, and the rotating clamping sleeve is located above the middle rotating shaft. According to the endoscopic surgical instrument, the tool bit can rotate around the axial direction so as to meet more operation requirements, and the convenience of surgical operation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a laparoscope surgical instrument. Background Art

[0002] Currently, instruments in endoscopic surgical systems are operated through the working channel of the endoscope to separate tissues during treatment. Due to limitations in operating space and position, the blade needs to be rotated by hand to meet operational requirements. However, due to the limited range of hand rotation, this cannot meet operational requirements. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. The utility model provides a laparoscopic surgical instrument, wherein the cutter head can rotate around the axis to meet more operation requirements and improve the convenience of surgical operation.

[0004] In order to achieve the above-mentioned object, the utility model provides a laparoscopic surgical instrument, comprising a handle and a cutting head, the handle comprising a handle shell, a trigger, a turntable, a central rotating shaft, a pull wire and a rotating ferrule, the handle shell being provided with a mounting cavity, one end of the cutting head being connected to the rotating ferrule, the rotating ferrule being rotatably connected to the handle shell and being located in the mounting cavity, the trigger being rotatably connected to the handle shell via a trigger rotating shaft, the trigger being transmission-connected to the turntable, at least a portion of the trigger being located outside the handle shell, the turntable being rotatably connected to the mounting cavity of the handle shell via a turntable rotating shaft, the pull wire being connected to the turntable and being wound around the outer circumference of the rotating ferrule through the central rotating shaft, and the rotating ferrule being located above the central rotating shaft;

[0005] The central rotating shaft, the rotating disk shaft and the trigger rotating shaft extend along a first direction, the axial direction of the rotating sleeve extends along a second direction, and the first direction is perpendicular to the second direction.

[0006] As a preferred solution, a sliding pin is connected to one side of the turntable, the sliding pin is eccentrically connected to one side of the turntable, one end of the trigger is provided with a sliding groove, and the sliding pin is slidably connected to the sliding groove.

[0007] As a preferred solution, the turntable is provided with a rotating block, which protrudes from the turntable along the first direction. The rotating block is arranged along the edge of the turntable, and at least a portion of the pull wire is in contact with the outer side of the rotating block.

[0008] As a preferred solution, the turntable is provided with a first side surface and a second side surface which are arranged opposite to each other in the first direction, the sliding pin is connected to the first side surface, and the rotating block is connected to the second side surface.

[0009] As a preferred solution, the turntable shaft is connected to a pre-tightening torsion spring, one end of the pre-tightening torsion spring is connected to the turntable, and the other end of the pre-tightening torsion spring is connected to the pull wire.

[0010] As a preferred solution, the trigger is connected to a trigger torsion spring, one end of the trigger torsion spring is connected to the handle housing, and the other end of the trigger torsion spring is connected to the trigger.

[0011] As a preferred solution, the rotating ferrule is provided with a card-connecting groove, the cutter head is installed in the card-connecting groove, and the cutter head is detachably connected to the rotating ferrule.

[0012] As a preferred embodiment, the cutter head includes a cutter head connector, and cutter head retaining grooves are respectively provided on two opposite sides of the outer circumference of the cutter head connector, and at least a portion of the cutter head retaining grooves extends in the circumferential direction and at least a portion extends in the axial direction;

[0013] The rotating sleeve is provided with a first sleeve slot and a second sleeve slot, and the first sleeve slot and the second sleeve slot are respectively connected to the card connection slot, and the handle also includes an elastic operating member connected to the rotating sleeve, and the elastic operating member includes a first clamping arm, a second clamping arm, an elastic arc rod and a button, the first clamping arm and the second clamping arm are respectively connected to the two ends of the elastic arc rod, the first clamping arm is clamped to the tool head slot corresponding to the position through the first sleeve slot, and the second clamping arm is clamped to the tool head slot corresponding to another position through the second sleeve slot, the opening of the elastic arc rod faces the rotating sleeve, and the handle shell is provided with an operating slot, the button is connected to the elastic arc rod and slides in the operating slot, and the button extends out of the handle shell through the operating slot.

[0014] As a preferred solution, the cutter head clamping groove includes a circumferential groove and an axial groove, the lower end of the circumferential groove is connected to one end of the axial groove to form a groove connection, the first clamping arm and the second clamping arm are respectively connected to one side of the cutter head joint with a clamping protrusion, the clamping protrusion is L-shaped, and the clamping protrusion is clamped in the groove connection.

[0015] As a preferred solution, the first clamping arm and the second clamping arm have the same structure, and the first clamping arm includes a first rod segment, a second rod segment, a third rod segment and a fourth rod segment. The first rod segment and the third rod segment extend along the height direction, and the second rod segment and the fourth rod segment extend along the second direction respectively. The upper end of the first rod segment is connected to the elastic arc rod, and the second rod segment is connected to the lower end of the first rod segment and the lower end of the third rod segment respectively. The upper end of the third rod segment is connected to one end of the fourth rod segment.

[0016] Compared with the prior art, the laparoscopic surgical instrument of the present invention has the following advantages: at least a portion of the trigger is exposed outside the handle housing, and during operation, the trigger is held by hand and operates in coordination with the handle housing. Specifically, when the trigger is pulled, the trigger rotates around the trigger shaft, the trigger is connected to the turntable, the trigger drives the turntable to rotate, the pull wire is connected to the turntable, the turntable pulls the pull wire to move, the pull wire is wound around the outer periphery of the rotating ferrule through the central shaft, the pull wire drives the rotating ferrule to rotate, the cutting head is connected to the rotating ferrule, and then drives the cutting head to rotate, so that the cutting head can rotate around the axial direction, thereby meeting more operation requirements and improving the convenience of surgical operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0018] Figure 2 It is a cross-sectional schematic diagram of one side of the overall structure of an embodiment of the utility model.

[0019] Figure 3 It is a cross-sectional schematic diagram of another side of the overall structure of an embodiment of the utility model.

[0020] Figure 4 It is a structural schematic diagram of a roulette wheel according to an embodiment of the present utility model.

[0021] Figure 5 It is a structural schematic diagram of a rotary ferrule according to an embodiment of the present utility model.

[0022] Figure 6 It is a structural schematic diagram of the cutter head joint of an embodiment of the present utility model.

[0023] Figure 7 It is a structural schematic diagram of the cutter head joint from another angle of an embodiment of the present utility model.

[0024] Figure 8 It is a structural diagram of the elastic operating member of an embodiment of the utility model.

[0025] Figure 9 It is a schematic diagram of the assembly structure of the elastic operating member, the rotary sleeve and the cutter head connector according to an embodiment of the present utility model.

[0026] Figure 10 This is an embodiment of the utility model Figure 9 Schematic diagram of the enlarged structure at B in FIG.

[0027] In the picture:

[0028] 60. Cutter head; 61. Cutter head connector; 62. Cutter head slot; 63. Circumferential groove; 64. Axial groove;

[0029] 70. Handle; 71. Handle housing; 72. Operating slot; 73. Mounting cavity; 74. Trigger; 75. Trigger torsion spring; 76. Slide slot; 77. Trigger shaft; 78. Turntable; 79. Preload spring; 80. Rotating block; 81. Second side surface; 82. Sliding pin; 83. First side surface; 84. Turntable shaft; 85. Rotating shaft; 86. Pull wire; 87. Rotating ferrule; 88. Connecting slot; 89. First ferrule slot; 90. Second ferrule slot.

[0030] 100. Elastic operating member; 101. First clamping arm; 102. Second clamping arm; 103. Elastic arc-shaped rod; 104. Button; 105. Clamping protrusion; 106. First rod segment; 107. Second rod segment; 108. Third rod segment; 109. Fourth rod segment. DETAILED DESCRIPTION

[0031] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present invention, it should be understood that the terms "connected," "connected," "fixed," etc. used in the present invention should be interpreted broadly. For example, the terms may refer to fixed connection, detachable connection, or integration; mechanical connection, welding connection; direct connection, indirect connection through an intermediate medium, internal communication between two elements, or interaction between two elements, unless otherwise explicitly defined. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] like Figures 1 to 10As shown, a laparoscopic surgical instrument according to a preferred embodiment of the present utility model includes a handle 70 and a cutting head 60. The handle 70 includes a handle housing 71, a trigger 74, a turntable 78, a rotating shaft 85, a pull wire 86 and a rotating sleeve 87. The handle housing 71 is provided with a mounting cavity 73. One end of the cutting head 60 is connected to the rotating sleeve 87. The rotating sleeve 87 is rotatably connected to the handle housing 71 and is located in the mounting cavity 73. The trigger 74 is rotatably connected to the handle housing 71 through the trigger rotating shaft 77. The trigger 74 is transmission-connected to the turntable 78. At least a portion of the trigger 74 is located outside the handle housing 71. The turntable 78 is rotatably connected to the mounting cavity 73 of the handle housing 71 through the rotating shaft of the turntable 78. The pull wire 86 is connected to the turntable 78 and is wound around the outer periphery of the rotating sleeve 87 through the rotating shaft 85. The rotating sleeve 87 is located above the rotating shaft 85.

[0035] The central rotating shaft 85, the rotating shaft of the rotating disk 78 and the trigger rotating shaft 77 extend along a first direction, and the axial direction of the rotating sleeve 87 extends along a second direction, and the first direction is perpendicular to the second direction.

[0036] In the laparoscopic surgical instrument of the present invention, at least a portion of the trigger 74 is exposed outside the handle housing 71. During operation, the trigger 74 is held by hand and operates in coordination with the handle housing 71. Specifically, when the trigger 74 is pulled, the trigger 74 rotates around the trigger shaft 77. The trigger 74 is in transmission connection with the turntable 78. The trigger 74 drives the turntable 78 to rotate. The pull wire 86 is connected to the turntable 78. The turntable 78 pulls the pull wire 86 to move. The pull wire 86 is wound around the outer periphery of the rotating sleeve 87 through the intermediate shaft 85. The pull wire 86 drives the rotating sleeve 87 to rotate. The cutter head 60 is connected to the rotating sleeve 87, thereby driving the cutter head 60 to rotate, so that the cutter head 60 can rotate around the axial direction, thereby meeting more operation requirements and improving the convenience of surgical operation.

[0037] Further, such as Figures 2 to 3 As shown, a sliding pin 82 is connected to one side of the rotating disk 78, and the sliding pin 82 is eccentrically connected to one side of the rotating disk 78. A sliding groove 76 is provided at one end of the trigger 74, and the sliding pin 82 is slidably connected to the sliding groove 76. When the trigger 74 is rotated by the trigger shaft 77, the sliding pin 82 is pushed to move in the sliding groove 76, so that the rotating disk 78 rotates. The rotating disk 78 pulls the pull wire 86 to move, and then drives the rotating sleeve 87 to rotate about the second direction.

[0038] Further, such as Figures 3 and 4 As shown, the turntable 78 is provided with a rotating block 80, which protrudes from the turntable 78 in a first direction and is disposed along the edge of the turntable 78. At least a portion of the pull wire 86 is in contact with the outer side surface of the rotating block 80. Due to the provision of the rotating block 80, during the rotation of the turntable 78, the pull wire 86 is in contact with the edge of the rotating block 80 and moves along the edge of the turntable 78, thereby tensioning the pull wire 86.

[0039] Further, such as Figures 2 to 3 As shown, the turntable 78 has a first side surface 83 and a second side surface 81 that are arranged opposite each other in a first direction. A sliding pin 82 is connected to the first side surface 83, and a rotating block 80 is connected to the second side surface 81. The sliding pin 82 is in driving connection with the trigger 74. The pull wire 86 engages with or separates from the rotating block 80 as the turntable 78 rotates. The sliding pin 82 and the rotating block 80 are not on the same side of the turntable 78 to avoid interference between the components during transmission and to properly allocate the rotation space.

[0040] Further, such as Figures 2 to 3 As shown, the rotating shaft of the turntable 78 is connected to a pre-tightening torsion spring 79, one end of which is connected to the turntable 78, and the other end of which is connected to the tension wire 86. The function of the pre-tightening torsion spring 79 is to maintain the tension of the tension wire 86 to prevent the turntable 78 from getting stuck or shifting during rotation.

[0041] like Figure 4 As shown, the rotating block 80 is provided with a connecting notch, and the first end of the pull wire 86 is connected to one end of the torsion spring. The pull wire 86 passes through the connecting notch and is wound around the outer peripheral surface of the rotating block 80, and abuts against the side of the central rotating shaft 85 away from the turntable 78 and is then wound around the rotating sleeve 87. After being wound around the rotating sleeve 87 for several turns, it abuts against the side of the central rotating shaft 85 away from the turntable 78, and the second end of the pull wire 86 is attached to the outer peripheral surface of the rotating block 80 and connected to the turntable 78.

[0042] The rotating shaft 85 plays a positioning role for the pull wire 86 , ensuring that the pull wire 86 can move axially around the rotating sleeve 87 on the rotating sleeve 87 .

[0043] As one embodiment, the pull wire 86 rotates 1 to 2 times on the rotating sleeve 87 .

[0044] Further, such as Figure 2 As shown, the trigger 74 is connected to a trigger torsion spring 75, one end of the trigger torsion spring 75 is connected to the handle housing 71, and the other end of the trigger torsion spring 75 is connected to the trigger 74. The function of the trigger torsion spring 75 is to reset and preload the trigger 74.

[0045] Further, such as Figure 5 As shown, the rotating sleeve 87 is provided with a card-connecting slot 88, and the cutter head 60 is installed in the card-connecting slot 88. The cutter head 60 is detachably connected to the rotating sleeve 87. The rotating sleeve 87 can be installed to replace the cutter head 60 as needed, and drive different cutter heads 60 to rotate to meet more usage requirements.

[0046] The detachable connection between the cutter head 60 and the rotating sleeve 87 can be achieved in the prior art, such as a snap connection or a bolt connection.

[0047] Further, such as Figures 5 to 10As shown, the cutter head 60 includes a cutter head connector 61, and cutter head retaining grooves 62 are respectively provided on two opposite sides of the outer periphery of the cutter head connector 61, and at least a portion of the cutter head retaining grooves 62 extends along the circumferential direction and at least a portion extends along the axial direction;

[0048] The rotating sleeve 87 is provided with a first sleeve slot 89 and a second sleeve slot 90, and the first sleeve slot 89 and the second sleeve slot 90 are respectively connected to the card slot 88. The handle 70 also includes an elastic operating member 100 connected to the rotating sleeve 87, and the elastic operating member 100 includes a first clamping arm 101, a second clamping arm 102, an elastic arc rod 103 and a button 104. The first clamping arm 101 and the second clamping arm 102 are respectively connected to the two ends of the elastic arc rod 103, and the first clamping arm 101 is clamped to the corresponding position of the cutter head slot 62 through the first sleeve slot 89, and the second clamping arm 102 is clamped to the corresponding position of the cutter head slot 62 through the second sleeve slot 90. The opening of the elastic arc rod 103 faces the rotating sleeve 87, and the handle housing 71 is provided with an operating slot 72. The button 104 is connected to the elastic arc rod 103 and extends out of and slides in the operating slot 72. At least a portion of the cutter head slot 62 extends circumferentially and at least a portion extends axially. The first clamping arm 101 and the second clamping arm 102 are respectively clamped to the oppositely arranged cutter head slot 62. The cutter head connector 61 is clamped by the elastic operating member 100. The first clamping arm 101 and the second clamping arm 102 are respectively clamped into the circumferentially extending portion of the cutter head slot 62 to prevent the cutter head connector 61 from falling off the axially rotating sleeve 87. The elastic operating member 100 is connected to the rotating sleeve 87. The rotation of the rotating sleeve 87 rotates synchronously with the elastic operating member 100. The first clamping arm 101 and the second clamping arm 102 are respectively clamped into the axially extending portion of the cutter head slot 62. The elastic operating member 100 drives the cutter head connector 61 to rotate synchronously. The first clamping arm 101 and the second clamping arm 102 are respectively connected to the two ends of the elastic arc rod 103, and the button 104 is connected to the elastic arc rod 103 and extends out of the handle housing 71 through the operating slot 72. When the rotary sleeve 87 rotates, the elastic operating part 100 rotates synchronously along the operating slot 72. When the tool head connector 61 needs to be separated from the rotary sleeve 87, the button 104 is pressed, the elastic arc rod 103 is deformed, and the first clamping arm 101 and the second clamping arm 102 move respectively in the direction away from the tool head slot 62, and then the first clamping arm 101 and the second clamping arm 102 are respectively separated from the tool head slot 62, and the tool head connector 61 moves axially and is separated from the rotating sleeve 87.

[0049] As one embodiment, the pull wire 86 is made of metal, and the pull wire 86 is in contact with the rotating sleeve 87, and the rotating sleeve 87 is driven to rotate by friction.

[0050] As one embodiment, a connecting rib is connected between the first clamping groove 89 and the second clamping groove 90, the elastic arc rod 103 is located above the corresponding connecting rib, and the first clamping arm 101 and the second clamping arm 102 are respectively located on both sides of the connecting rib.

[0051] Further, such as Figures 6 to 8 As shown, the cutter head slot 62 includes a circumferential slot 63 and an axial slot 64. The lower end of the circumferential slot 63 is connected to one end of the axial slot 64 to form a slot connection. The first and second clamping arms 101 and 102 are each connected to a clamping protrusion 105 on one side facing the cutter head connector 61. The clamping protrusion 105 is L-shaped and is clamped to the slot connection. The first and second clamping arms 101 and 102 are respectively clamped to the circumferential extension and axial extension of the cutter head slot 62 via the L-shaped clamping protrusion 105.

[0052] Further, such as Figure 8 As shown, the first clamping arm 101 and the second clamping arm 102 have the same structure. The first clamping arm 101 includes a first rod segment 106, a second rod segment 107, a third rod segment 108, and a fourth rod segment 109. The first rod segment 106 and the third rod segment 108 extend in the height direction, and the second rod segment 107 and the fourth rod segment 109 extend in the second direction. The upper end of the first rod segment 106 is connected to the elastic arc rod 103, the second rod segment 107 is connected to the lower end of the first rod segment 106 and the lower end of the third rod segment 108, respectively, and the upper end of the third rod segment 108 is connected to one end of the fourth rod segment 109. The overall shape of the first clamping arm 101 and the second clamping arm 102 is roughly arranged in an X shape, which improves the structural stability of the elastic operating member 100.

[0053] In summary, the embodiment of the present invention provides a laparoscopic surgical instrument, wherein at least a portion of the trigger 74 is exposed outside the handle housing 71. During operation, the trigger 74 is held by hand and operates in coordination with the handle housing 71. Specifically, the trigger 74 is pulled, and the trigger 74 rotates around the trigger shaft 77. The trigger 74 is in transmission connection with the turntable 78, and the trigger 74 drives the turntable 78 to rotate. The pull wire 86 is connected to the turntable 78, and the turntable 78 pulls the pull wire 86 to move. The pull wire 86 is wound around the outer periphery of the rotating sleeve 87 through the intermediate shaft 85, and the pull wire 86 drives the rotating sleeve 87 to rotate. The cutter head 60 is connected to the rotating sleeve 87, and then drives the cutter head 60 to rotate, so that the cutter head 60 can rotate around the axial direction, thereby meeting more operation requirements and improving the convenience of surgical operation.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A laparoscopic surgical instrument, characterized in that: The utility model comprises a handle and a cutting head, wherein the handle comprises a handle shell, a trigger, a turntable, a central rotating shaft, a pull wire and a rotating sleeve, the handle shell is provided with a mounting cavity, one end of the cutting head is connected to the rotating sleeve, the rotating sleeve is rotatably connected to the handle shell and is located in the mounting cavity, the trigger is rotatably connected to the handle shell via a trigger rotating shaft, the trigger is transmission-connected to the turntable, at least a part of the trigger is located outside the handle shell, the turntable is rotatably connected to the mounting cavity of the handle shell via a turntable rotating shaft, the pull wire is connected to the turntable and is wound around the outer circumference of the rotating sleeve via the central rotating shaft, and the rotating sleeve is located above the central rotating shaft; The central rotating shaft, the rotating disk shaft and the trigger rotating shaft extend along a first direction, the axial direction of the rotating sleeve extends along a second direction, and the first direction is perpendicular to the second direction.

2. The laparoscopic surgical instrument according to claim 1, characterized in that: A sliding pin is connected to one side of the turntable, and the sliding pin is eccentrically connected to one side of the turntable. A sliding groove is provided at one end of the trigger, and the sliding pin is slidably connected to the sliding groove.

3. The laparoscopic surgical instrument according to claim 2, characterized in that: The turntable is provided with a rotating block, which protrudes from the turntable along the first direction. The rotating block is arranged along the edge of the turntable, and at least a portion of the pull wire is in contact with the outer side of the rotating block.

4. The laparoscopic surgical instrument according to claim 3, characterized in that: The turntable is provided with a first side surface and a second side surface which are oppositely arranged in the first direction, the sliding pin is connected to the first side surface, and the rotating block is connected to the second side surface.

5. The laparoscopic surgical instrument according to claim 3, characterized in that: The turntable shaft is connected to a pre-tightening torsion spring, one end of the pre-tightening torsion spring is connected to the turntable, and the other end of the pre-tightening torsion spring is connected to the pull wire.

6. The laparoscopic surgical instrument according to claim 1, characterized in that: The trigger is connected to a trigger torsion spring, one end of the trigger torsion spring is connected to the handle housing, and the other end of the trigger torsion spring is connected to the trigger.

7. The laparoscopic surgical instrument according to claim 1, characterized in that: The rotary ferrule is provided with a card-connecting groove, the cutter head is installed in the card-connecting groove, and the cutter head is detachably connected to the rotary ferrule.

8. The laparoscopic surgical instrument according to claim 7, characterized in that: The cutter head includes a cutter head connector, and cutter head retaining grooves are respectively provided on two opposite sides of the outer circumference of the cutter head connector, and at least a portion of the cutter head retaining grooves extends in the circumferential direction and at least a portion extends in the axial direction; The rotating sleeve is provided with a first sleeve slot and a second sleeve slot, and the first sleeve slot and the second sleeve slot are respectively connected to the card connection slot, and the handle also includes an elastic operating member connected to the rotating sleeve, and the elastic operating member includes a first clamping arm, a second clamping arm, an elastic arc rod and a button, the first clamping arm and the second clamping arm are respectively connected to the two ends of the elastic arc rod, the first clamping arm is clamped to the tool head slot corresponding to the position through the first sleeve slot, and the second clamping arm is clamped to the tool head slot corresponding to another position through the second sleeve slot, the opening of the elastic arc rod faces the rotating sleeve, and the handle shell is provided with an operating slot, the button is connected to the elastic arc rod and slides in the operating slot, and the button extends out of the handle shell through the operating slot.

9. The laparoscopic surgical instrument according to claim 8, characterized in that: The cutter head clamping groove includes a circumferential groove and an axial groove. The lower end of the circumferential groove is connected to one end of the axial groove to form a groove connection. The first clamping arm and the second clamping arm are respectively connected to one side of the cutter head joint with a clamping protrusion. The clamping protrusion is L-shaped and is clamped to the groove connection.

10. The laparoscopic surgical instrument according to claim 8, characterized in that: The first clamping arm and the second clamping arm have the same structure. The first clamping arm includes a first rod segment, a second rod segment, a third rod segment and a fourth rod segment. The first rod segment and the third rod segment extend along the height direction, and the second rod segment and the fourth rod segment extend along the second direction respectively. The upper end of the first rod segment is connected to the elastic arc rod, and the second rod segment is connected to the lower end of the first rod segment and the lower end of the third rod segment respectively. The upper end of the third rod segment is connected to one end of the fourth rod segment.

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