Minimally invasive rotary cutter

Abstract

The invention discloses a minimally invasive rotary cutter which comprises a shell, a cutter tube assembly and a first output mechanism. One end of the knife tube assembly is located in the shell, the other end of the knife tube assembly exceeds the shell, the knife tube assembly comprises an outer knife tube, a middle knife tube and an inner knife tube which are coaxially arranged from outside to inside, one end of the outer knife tube is connected with the shell, a first notch is formed in the side wall of the other end of the outer knife tube, one end of the inner knife tube penetrates through the first output mechanism, and the penetrating-out end of the inner knife tube is connected with the first driver; a second notch is formed in the side wall of the other end of the inner cutter tube, the first driver can drive the inner cutter tube to rotate in the axial direction of the inner cutter tube so that the second notch can directly face or be staggered with the first notch, one end of the middle cutter tube penetrates out of the outer cutter tube, the penetrating-out end is connected with the first output mechanism, and the first output mechanism can drive the middle cutter tube to conduct axial reciprocating displacement. The tissue is clamped before rotary cutting, rotary cutting of the tissue under a large-diameter opening can be achieved, the rotary cutting effect is good, safety is good, and efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of surgical instruments, and more particularly to a minimally invasive rotary cutter. Background Art

[0002] Breast cancer has become a common disease worldwide. In clinical practice, the removal of breast cancer lesions is usually performed with a cold knife excision.

[0003] Existing operative blades have narrow, elongated blades, which cut a small amount of tissue each time and prevent the patient from holding the tissue during the procedure. Furthermore, minimally invasive operative blades rely on cold blade excision and vacuum pressure to extract the tumor, potentially damaging local blood vessels and causing bleeding and hematoma. If these issues arise, external pressure is the only option for hemostasis. If the bleeding is severe or rapid, conventional open surgery is required to stop the bleeding under direct vision. Therefore, improvements are urgently needed. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a minimally invasive rotary cutting knife that can achieve rotary cutting of tissue with a large opening by clamping the tissue before rotary cutting, with good rotary cutting effect, good safety and high efficiency.

[0005] In order to achieve the above-mentioned object, the present invention adopts the following technical solution: a minimally invasive rotary cutter, comprising a housing, a blade tube assembly and a first output mechanism;

[0006] One end of the knife tube assembly is located in the shell and the other end extends beyond the shell. The knife tube assembly includes an outer knife tube, an intermediate knife tube and an inner knife tube coaxially arranged from the outside to the inside. One end of the outer knife tube is connected to the shell and the other end side wall is provided with a first notch. One end of the inner knife tube passes through the first output mechanism and the outgoing end is connected to the first driver. The other end side wall of the inner knife tube is provided with a second notch. The first driver can drive the inner knife tube to rotate along its axial direction so that the second notch is opposite to or offset from the first notch. One end of the intermediate knife tube passes through the outer knife tube and the outgoing end is connected to the first output mechanism. The first output mechanism can drive the intermediate knife tube to move axially back and forth so that the end of the intermediate knife tube away from the first output mechanism closes the first notch or is offset from the first notch.

[0007] Furthermore, a first mounting portion is provided inside the shell, a first mounting cavity is provided inside the first mounting portion, the first output mechanism includes a sliding sleeve, the sliding sleeve is fixedly connected to the outer wall of the middle knife tube, the sliding sleeve is located in the first mounting cavity and can move back and forth along the first mounting cavity.

[0008] Furthermore, the first output mechanism also includes a handle and a connecting rod, the shell includes a rotating shaft and a handle, one end of the handle is located outside the shell and on the side of the handle, the other end of the handle is located inside the shell and is hinged to the rotating shaft, the handle is provided with a rib at the end of the rotating shaft, one end of the connecting rod is hinged to the sliding sleeve and the other end is hinged to the rib, the handle rotates toward the handle with the rotating shaft as the axis, so that the connecting rod pushes the sliding sleeve to move along the first mounting cavity and drives the middle knife tube to move to block the first gap.

[0009] Furthermore, the first output mechanism also includes a torsion spring, which is located on the side of the handle away from the handle. A fixed shaft and a limiting rib are provided inside the shell. The torsion spring is sleeved on the outside of the fixed shaft. One end of the torsion spring abuts the limiting rib and the other end abuts the convex rib.

[0010] Furthermore, a negative pressure channel is provided inside the shell, an interface is connected to the open end of the negative pressure channel, a sealing sleeve is provided on the side of the negative pressure channel, the inner knife tube passes through the sealing sleeve and the negative pressure channel, the outer wall of the inner knife tube is sealed with the sealing sleeve, a transmission channel is provided inside the inner knife tube, a through hole is provided on the side of the inner knife tube, the through hole is connected with the negative pressure channel, the through hole is connected with the second notch through the transmission channel, a block is fixedly connected to the opening of the transmission channel, and the first driver is connected to the block.

[0011] Furthermore, a second output mechanism is provided inside the shell, the intermediate knife tube passes through the sliding sleeve and the protruding end is connected to the second output mechanism, the intermediate knife tube and the sliding sleeve are connected through a bearing, and the second output mechanism can drive the intermediate knife tube to rotate.

[0012] Furthermore, the second output mechanism includes a second driver and a rotating sleeve. One end of the intermediate blade tube is inserted into the rotating sleeve. The second driver can drive the rotating sleeve to rotate, thereby driving the intermediate blade tube to rotate.

[0013] Furthermore, a second mounting portion is provided inside the shell, the rotating sleeve is connected to the second mounting portion through a bearing, a limit platform is provided on the outer wall of the intermediate knife tube, the cross-section of the limit platform is non-circular, a limit groove is provided inside the rotating sleeve to cooperate with the limit platform, the limit platform is at least partially inserted into the limit groove, a gear is installed on the shaft end of the second driver, a plurality of convex teeth meshing with the gear are provided on the outer wall of the rotating sleeve, and the gear can drive the rotating sleeve to rotate.

[0014] Furthermore, a connector is threadedly connected to the side of the shell, one end of the outer knife tube is fixedly connected to the connector, a metal sleeve is provided inside the connector, the inner wall of the metal sleeve is fixedly connected to the inner wall of the outer knife tube, an electrode head and a first electric clamp are installed inside the shell, one end of the electrode head abuts the metal sleeve, the first electric clamp is clamped on the outer wall of the inner knife tube, a second mounting cavity is also provided inside the first mounting part, a second electric clamp is installed in the second mounting cavity, and the second electric clamp is clamped on the outer wall of the middle knife tube.

[0015] Furthermore, the outer wall of the inner blade tube is insulated from the middle blade tube, the outer wall of the middle blade tube is insulated from the outer blade tube, and the outer wall of the outer blade tube is insulated.

[0016] In summary, the present invention has the following beneficial effects:

[0017] 1. When the tissue enters the inner blade tube, the first output mechanism pushes the middle blade tube to move, and the middle blade tube clamps the tissue at the first notch. At this time, the inner blade tube is used for rotary cutting. This method can not only effectively prevent the tissue from moving and shifting during rotary cutting, thereby improving the rotary cutting effect and realizing rotary cutting of tissue under the large-caliber first notch, but also can achieve clamping and hemostasis at the incision after cutting, reduce bleeding volume, and reduce surgical risks.

[0018] 2. The outer knife tube, inner knife tube and middle knife tube can be energized separately through the electrode head, the first electric clamp and the second electric clamp. For cutting lesion tissues in some special positions (such as near blood vessels), electric cutting can be used for rotary cutting, which can effectively reduce the amount of bleeding at the incision and avoid heavy bleeding; after the cutting is completed, the inner knife tube 3 is powered off and the middle knife tube is powered on. The middle knife tube and the outer knife tube form a circuit, and the lesion tissue located at the clamping position of the middle knife tube is electrocoagulated and hemostatically stopped through the middle knife tube, which effectively improves the hemostatic effect at the lesion tissue and reduces the surgical risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 Schematic diagram of the local structure of the knife tube assembly in the first state;

[0021] Figure 3 is a schematic diagram of the local structure of the knife tube assembly in the second state;

[0022] Figure 4 for Figure 1 A partial schematic diagram of

[0023] Figure 5 for Figure 1 A partial schematic diagram of

[0024] Figure 6 for Figure 1 A partial schematic diagram of

[0025] Figure 7 Exploded view of the knife tube assembly.

[0026] Reference numerals: 1. housing; 101. negative pressure channel; 102. first mounting portion; 103. first mounting cavity; 104. second mounting cavity; 105. guide groove; 106. rotating shaft; 107. fixed shaft; 108. limiting rib; 109. avoidance opening; 110. second mounting portion; 111. handle; 112. sealing sleeve; 2. outer blade tube; 201. first notch; 3. inner blade tube; 301. second notch; 302. transmission channel; 303. through hole; 4. intermediate blade tube; 401. sharp teeth; 402. Limiting platform; 5. Connecting head; 501. Metal sleeve; 6. First output mechanism; 601. Handle; 602. Raised rib; 603. Connecting rod; 604. Sliding sleeve; 605. Hinge seat; 606. Torsion spring; 7. First drive; 8. Second output mechanism; 801. Second drive; 802. Gear; 803. Rotating sleeve; 804. Raised tooth; 805. Limiting groove; 9. Interface; 10. Blocking block; 11. Electrode head; 12. First electric clamp; 13. Second electric clamp; 14. Wire sleeve; 1000. Knife barrel assembly. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example 1:

[0029] like Figures 1 to 7 As shown, this embodiment discloses a minimally invasive rotary cutter, comprising a housing 1, a blade tube assembly 1000 and a first output mechanism 6;

[0030] One end of the knife tube assembly 1000 is located inside the shell 1 and the other end extends beyond the shell 1. The knife tube assembly 1000 includes an outer knife tube 2, an intermediate knife tube 4 and an inner knife tube 3 coaxially arranged from the outside to the inside. The outer knife tube 2, the intermediate knife tube 4 and the inner knife tube 3 are all metal pipes.

[0031] like Figure 1-3As shown, one end of the outer knife tube 2 is connected to the shell 1 and the other end side wall is provided with a first notch 201. Specifically, the shell 1 side is threadedly connected to a connector 5, and one end of the outer knife tube 2 is fixedly connected to the connector 5. The width of the first notch 201 can reach the diameter of the outer knife tube 2, so that the first notch 201 is a large-diameter notch, so that more diseased tissues can enter the first notch 201.

[0032] One end of the inner knife tube 3 passes through the first output mechanism 6 and the outgoing end is connected to the first driver 7. The first driver 7 is a motor. The side wall of the other end of the inner knife tube 3 is provided with a second notch 301. The second notch 301 is adapted to the first notch 201. The length dimension of the second notch 301 is larger than the first notch 201, and its width dimension is the diameter dimension of the inner knife tube 3. The first driver 7 can drive the inner knife tube 3 to rotate along its axial direction so that the second notch 301 is opposite to or offset from the first notch 201.

[0033] During the operation, the second notch 301 is opposite to the first notch 201, and the protruding diseased tissue will enter the inner knife tube 3 from the first notch 201 and the second notch 301, and then the inner knife tube 3 is driven to rotate by the first driver 7 to realize the rotary cutting of the diseased tissue located in the inner knife tube 3. However, since the first notch 201 and the second notch 301 have large opening sizes in order to accommodate more tissues, they are large-caliber openings and have less constraints on the tissues, which will cause tissue displacement during rotary cutting and affect the rotary cutting effect.

[0034] In the present invention, an intermediate blade tube 4 is provided, one end of which passes through the outer blade tube 2 and is connected to the first output mechanism 6. The first output mechanism 6 can drive the intermediate blade tube 4 to move axially back and forth, so that the end of the intermediate blade tube 4 away from the first output mechanism 6 closes the first notch 201 or is offset from the first notch 201.

[0035] When the tissue enters the inner knife tube 3, the first output mechanism 6 pushes the middle knife tube 4 to move, and the middle knife tube 4 clamps the tissue located at the first notch 201. At this time, the inner knife tube 3 is used for rotary cutting. This method can not only effectively avoid the movement and displacement of the tissue during rotary cutting, thereby improving the rotary cutting effect and realizing the rotary cutting operation of the tissue under the large-caliber first notch 201, but also can achieve clamping and hemostasis of the incision after the cutting is completed, reduce the amount of bleeding, and reduce the risk of surgery.

[0036] like Figure 1 and Figure 4As shown, specifically, a first mounting portion 102 is provided inside the shell 1, and a first mounting cavity 103 is provided inside the first mounting portion 102. The first output mechanism 6 includes a sleeve 604, and the sleeve 604 is fixedly connected to the outer wall of the intermediate knife tube 4. The sleeve 604 is located in the first mounting cavity 103 and can reciprocate along the first mounting cavity 103. The first output mechanism 6 also includes a handle 601 and a connecting rod 603. The shell 1 includes a rotating shaft 106 and a handle 111. One end of the handle 601 is located outside the shell 1 and on the side of the handle 111. The handle 601 passes through the avoidance opening 109 on the side of the shell 1. The other end of the handle 601 is located inside the shell 1 and is hinged to the rotating shaft 106. The handle 601 is provided with a rib 602 at the end of the rotating shaft 106. The connecting rod 603 is provided with a rib 602 at the end of the rotating shaft 106. The first end is hinged to the sliding sleeve 604 and the other end is hinged to the convex rib 602. A guide groove 105 is provided at the lower part of the first installation cavity 103. A hinge seat 605 is provided at the lower part of the sliding sleeve 604. The connecting rod 603 is hinged to the hinge seat 605. The hinge seat 605 passes through the guide groove 105. The handle 601 rotates toward the handle 111 with the rotating shaft 106 as the axis, so that the connecting rod 603 pushes the sliding sleeve 604 to move along the first installation cavity 103 and drives the middle knife tube 4 to move to block the first notch 201. The first output mechanism 6 also includes a torsion spring 606. The torsion spring 606 is located on the side of the handle 601 away from the handle 111. A fixed shaft 107 and a limiting rib 108 are provided inside the housing 1. The torsion spring 606 is sleeved on the outside of the fixed shaft 107. One end of the torsion spring 606 abuts the limiting rib 108 and the other end abuts the convex rib 602.

[0037] During operation, the surgeon holds the handle 111 with his hand. When the middle knife tube 4 needs to be moved to clamp the tissue, he only needs to press the handle 601 toward the handle 111 with the hand holding the handle 111. The handle 601 then pushes the sliding sleeve 604 to move through the connecting rod 603, and pushes the middle knife tube 4 to move and clamp the diseased tissue through the sliding sleeve 604. When pressing the handle 601, the handle 601 squeezes the torsion spring 606, causing the torsion spring 606 to compress. Therefore, when the handle 601 is released, the handle 601 is reset by the rebound force of the torsion spring 606, thereby driving the middle knife tube 4 to reset.

[0038] like Figure 1 and Figure 6As shown, a negative pressure channel 101 is provided inside the shell 1, and an interface 9 is connected to the open end of the negative pressure channel 101. The negative pressure interface 9 is connected to an external negative pressure suction device (not shown in the figure), and a sealing sleeve 112 is provided on the side of the negative pressure channel 101. The inner knife tube 3 passes through the sealing sleeve 112 and the negative pressure channel 101, and the outer wall of the inner knife tube 3 is sealed with the sealing sleeve 112. A transmission channel 302 is provided inside the inner knife tube 3, and a through hole 303 is provided on the side of the inner knife tube 3. The through hole 303 is communicated with the negative pressure channel 101, and the through hole 303 is communicated with the second notch 301 through the transmission channel 302. A block 10 is fixedly connected to the opening of the transmission channel 302. The block 10 is made of insulating material, preferably plastic, and the first driver 7 is fixedly connected to the block 10.

[0039] Through suction by an external negative pressure device, the excised lesion tissue can be collected in the negative pressure device through the transmission channel 302, the through hole 303, the negative pressure channel 101 and the interface 9 in sequence.

[0040] Example 2:

[0041] like Figure 1 、 Figure 4 and Figure 5 As shown, on the basis of embodiment 1, a second output mechanism 8 is further provided inside the shell 1, the intermediate knife tube 4 passes through the sliding sleeve 604 and the protruding end is connected to the second output mechanism 8, the intermediate knife tube 4 is connected to the sliding sleeve 604 by a bearing, and the second output mechanism 8 can drive the intermediate knife tube 4 to rotate. Specifically, the second output mechanism 8 includes a second driver 801 and a rotating sleeve 803, one end of the intermediate knife tube 4 is inserted into the rotating sleeve 803, and the second driver 801 can drive the rotating sleeve 803 to rotate, so as to drive the intermediate knife tube 4 to rotate. The second driver 801 is also a motor and is arranged side by side with the first driver 7. Through the above design, the intermediate knife tube 4 can not only clamp the lesion tissue, but also clamp the lesion tissue and then cut it, thereby increasing the resection mode. When the lesion tissue with a longitudinal size larger than the transverse size is removed, the inner knife tube 3 can be used for cutting, and for the lesion tissue with a transverse size larger than the longitudinal size, the intermediate knife tube 4 can be used for first clamping and then rotating and removing, or the doctor can choose a suitable resection method based on his experience.

[0042] Specifically, a second mounting portion 110 is provided inside the shell 1, and the rotating sleeve 803 is connected to the second mounting portion 110 through a bearing. A limit platform 402 is provided on the outer wall of the intermediate knife tube 4, and the cross-section of the limit platform 402 is non-circular. A limit groove 805 is provided inside the rotating sleeve 803 to cooperate with the limit platform 402, and the limit platform 402 is at least partially inserted into the limit groove 805. A gear 802 is installed at the shaft end of the second driver 801, and a plurality of convex teeth 804 engaged with the gear 802 are provided on the outer wall of the rotating sleeve 803. The gear structure formed by the rotating sleeve 803 and the convex teeth 804 is engaged with the gear 802 on the second driver 801, and the rotating sleeve 803 is driven to rotate by the gear 802, thereby realizing the rotation of the intermediate knife tube 4.

[0043] like Figure 7 As shown, the end of the middle knife tube 4 is in the shape of sharp teeth 401. This design is not only beneficial to improving the clamping effect of the lesion tissue, but also beneficial to the rotary cutting of the lesion tissue.

[0044] Example 3:

[0045] On the basis of the second embodiment, a metal sleeve 501 is provided inside the connecting head 5, and the inner wall of the metal sleeve 501 is fixedly connected to the inner wall of the outer knife tube 2. An electrode head 11 and a first electric clamp 12 are installed inside the shell 1, and one end of the electrode head 11 abuts the metal sleeve 501. The first electric clamp 12 is clamped on the outer wall of the inner knife tube 3. A second mounting cavity 104 is further provided inside the first mounting portion 102, and a second electric clamp 13 is installed in the second mounting cavity 104. The second electric clamp 13 is clamped on the outer wall of the intermediate knife tube 4. The outer wall of the inner knife tube 3 is insulated from the intermediate knife tube 4, the outer wall of the intermediate knife tube 4 is insulated from the outer knife tube 2, and the outer wall of the outer knife tube 2 is insulated;

[0046] Specifically, a gap is provided between the outer wall of the inner knife tube 3 and the inner wall of the middle knife tube 4, and a gap is also provided between the outer wall of the middle knife tube 4 and the inner wall of the outer knife tube 2. The outer wall of the inner knife tube 3 is coated with an insulating coating except for the contact surface with the first electric clamp 12, the outer wall of the middle knife tube 4 is coated with an insulating coating except for the contact surface with the second electric clamp 13, and the outer wall of the outer knife tube 2 is coated with an insulating coating except for the contact surface with the metal sleeve 501. Through this design, the three can be prevented from creeping when powered on. The electrode head 11, the first electric clamp 12 and the second electric clamp 13 are each separately connected to a wire, and the three wires are then inserted into the wire sleeve 14, and can be connected to an external power supply device (not shown in the figure) through the wire sleeve 14. The outer knife tube 2, the inner knife tube 3 and the middle knife tube 4 can be energized separately through the electrode head 11, the first electric clamp 12 and the second electric clamp 13, wherein the outer knife tube 2 serves as the RF negative electrode, and the inner knife tube 2 serves as the RF negative electrode. Tube 3 and the middle knife tube 4 serve as two radio frequency positive electrodes respectively. When the middle knife tube 4 acts as a clamp, the middle knife tube 4 is not energized, and the inner knife tube 3 and the outer knife tube 2 are energized. When the lesion tissue contacts the inner knife tube 3 and the outer knife tube 2 respectively, a circuit can be realized. At this time, rotating the inner knife tube 3 can realize the rotary electric cutting function. For cutting lesion tissue in some special positions (such as near blood vessels), electric cutting can be used for rotary cutting, which can effectively reduce the amount of bleeding at the incision and avoid heavy bleeding; after the cutting is completed, the inner knife tube 3 is powered off, and then the middle knife tube 4 is powered on. The middle knife tube 4 and the outer knife tube 2 form a circuit, and the lesion tissue located at the clamping position of the middle knife tube 4 is electrocoagulated and hemostatically stopped through the middle knife tube 4, which effectively improves the hemostatic effect at the lesion tissue and reduces the surgical risk. Among them, the principle of electrocuting and electrocoagulating hemostasis of the wound is the existing technology and will not be repeated again.

[0047] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A minimally invasive rotary cutting knife, characterized in that: It comprises a housing (1), a knife tube assembly (1000) and a first output mechanism (6); One end of the knife tube assembly (1000) is located inside the housing (1) and the other end thereof extends beyond the housing (1). The knife tube assembly (1000) comprises an outer knife tube (2), an intermediate knife tube (4) and an inner knife tube (3) coaxially arranged from outside to inside. One end of the outer knife tube (2) is connected to the housing (1) and a first notch (201) is provided on the side wall of the other end. One end of the inner knife tube (3) passes through the first output mechanism (6) and the protruding end is connected to the first driver (7). The other end of the inner knife tube (3) is provided on the side wall of the second notch ( 301), the first driver (7) can drive the inner knife tube (3) to rotate along its axial direction so that the second notch (301) is aligned with or offset from the first notch (201), one end of the intermediate knife tube (4) passes through the outer knife tube (2) and the passing end is connected to the first output mechanism (6), and the first output mechanism (6) can drive the intermediate knife tube (4) to move back and forth axially so that the end of the intermediate knife tube (4) away from the first output mechanism (6) closes the first notch (201) or is offset from the first notch (201).

2. The minimally invasive rotary dermal cutter according to claim 1, characterized in that: A first mounting portion (102) is provided inside the housing (1), a first mounting cavity (103) is provided inside the first mounting portion (102), the first output mechanism (6) comprises a sliding sleeve (604), the sliding sleeve (604) is fixedly connected to the outer wall of the intermediate knife tube (4), the sliding sleeve (604) is located in the first mounting cavity (103) and can reciprocate along the first mounting cavity (103).

3. The minimally invasive rotary cutting knife according to claim 2, characterized in that: The first output mechanism (6) further comprises a handle (601) and a connecting rod (603), the housing (1) comprises a rotating shaft (106) and a handle (111), one end of the handle (601) is located outside the housing (1) and on the side of the handle (111), the other end of the handle (601) is located inside the housing (1) and is hinged to the rotating shaft (106), the handle (601) is provided with a convex rib (602) at the end of the rotating shaft (106), one end of the connecting rod (603) is hinged to the sliding sleeve (604) and the other end is hinged to the convex rib (602), the handle (601) rotates toward the handle (111) with the rotating shaft (106) as the axis, so that the connecting rod (603) pushes the sliding sleeve (604) to move along the first mounting cavity (103) and drives the intermediate knife tube (4) to move to block the first notch (201).

4. The minimally invasive rotary dermal cutter according to claim 3, characterized in that: The first output mechanism (6) further comprises a torsion spring (606), the torsion spring (606) being located on a side of the handle (601) away from the grip (111), a fixed shaft (107) and a limiting rib (108) being provided inside the housing (1), the torsion spring (606) being sleeved on the outside of the fixed shaft (107), one end of the torsion spring (606) being in contact with the limiting rib (108) and the other end being in contact with the convex rib (602).

5. The minimally invasive rotary dermal cutter according to claim 1, characterized in that: A negative pressure channel (101) is provided inside the shell (1), an interface (9) is connected to the open end of the negative pressure channel (101), a sealing sleeve (112) is provided on the side of the negative pressure channel (101), the inner knife tube (3) passes through the sealing sleeve (112) and the negative pressure channel (101), the outer wall of the inner knife tube (3) is sealed with the sealing sleeve (112), a transmission channel (302) is provided inside the inner knife tube (3), a through hole (303) is provided on the side of the inner knife tube (3), the through hole (303) is communicated with the negative pressure channel (101), the through hole (303) is communicated with the second notch (301) through the transmission channel (302), a blocking block (10) is fixedly connected to the opening of the transmission channel (302), and the first driver (7) is connected to the blocking block (10).

6. The minimally invasive rotary dermal cutter according to claim 2, characterized in that: A second output mechanism (8) is provided inside the housing (1); the intermediate knife tube (4) passes through the sliding sleeve (604) and the protruding end is connected to the second output mechanism (8); the intermediate knife tube (4) and the sliding sleeve (604) are connected via a bearing; the second output mechanism (8) can drive the intermediate knife tube (4) to rotate.

7. The minimally invasive rotary dermal cutter according to claim 6, characterized in that: The second output mechanism (8) includes a second driver (801) and a rotating sleeve (803), one end of the intermediate blade tube (4) is inserted into the rotating sleeve (803), and the second driver (801) can drive the rotating sleeve (803) to rotate, thereby driving the intermediate blade tube (4) to rotate.

8. The minimally invasive rotary dermal cutter according to claim 7, characterized in that: A second mounting portion (110) is provided inside the housing (1), and the rotating sleeve (803) is connected to the second mounting portion (110) via a bearing. A limiting platform (402) is provided on the outer wall of the intermediate knife tube (4), and the cross section of the limiting platform (402) is non-circular. A limiting groove (805) cooperating with the limiting platform (402) is provided inside the rotating sleeve (803), and the limiting platform (402) is at least partially inserted into the limiting groove (805). A gear (802) is installed on the shaft end of the second driver (801), and a plurality of protruding teeth (804) meshing with the gear (802) are provided on the outer wall of the rotating sleeve (803), and the gear (802) can drive the rotating sleeve (803) to rotate.

9. The minimally invasive rotary dermal cutter according to claim 7, characterized in that: The shell (1) is threadedly connected to a connector (5) on the side, one end of the outer blade tube (2) is fixedly connected to the connector (5), a metal sleeve (501) is provided inside the connector (5), the inner wall of the metal sleeve (501) is fixedly connected to the inner wall of the outer blade tube (2), an electrode head (11) and a first electric clamp (12) are installed inside the shell (1), one end of the electrode head (11) abuts the metal sleeve (501), the first electric clamp (12) is clamped on the outer wall of the inner blade tube (3), a second mounting cavity (104) is further provided inside the first mounting portion (102), a second electric clamp (13) is installed in the second mounting cavity (104), and the second electric clamp (13) is clamped on the outer wall of the middle blade tube (4).

10. The minimally invasive rotary dermal cutter according to claim 9, characterized in that: The outer wall of the inner knife tube (3) is insulated from the middle knife tube (4), the outer wall of the middle knife tube (4) is insulated from the outer knife tube (2), and the outer wall of the outer knife tube (2) is insulated.

Images