A plasma surgical knife

Abstract

The present invention discloses a plasma scalpel, comprising a handle, a shank body and an electrode assembly, wherein the proximal end of the shank body is connected to the handle, and the distal end of the shank body is provided with an electrode assembly, wherein the electrode assembly comprises a return electrode, a thread-shaped emitter and an insulating member connected to the distal end of the shank body to electrically insulate and separate the return electrode from the emitter, wherein the emitter is curved from the distal end face of the insulating member as a whole and extends to the distal side of the insulating member. The plasma scalpel of the present invention can accurately perform surgery on diseased tissues, can effectively avoid accidental injury to normal tissues, and improve the surgical effect, the emitter can form plasma at multiple specific positions, and different parts of the emitter can be used to perform surgery on target tissues that are not easily exposed, such as the throat, with high surgical precision and good effect, no need to replace surgical instruments during surgery, high surgical operation efficiency, shortened surgical time, and saved surgical expenses.

Description

Technical Field

[0001] The invention relates to the technical field of surgical medical instruments, and in particular to a plasma scalpel. Background Art

[0002] Low-temperature plasma ablation technology can achieve functions such as cutting, ablation and hemostasis of tissues under low temperature (40-70°C) conditions, and is increasingly used in clinical surgery, especially in minimally invasive surgery in otolaryngology and head and neck surgery. Usually, the channel of minimally invasive surgery is very small, and the surgical area is narrow and complex. The existing surgical blades cause great trauma to tissues, and the surgical operation accuracy is poor, which is easy to accidentally injure the patient's normal tissues. The normal structure is too damaged after surgery, thus affecting its function. The unreasonable shape of the surgical blade brings great inconvenience to the doctor's operation and affects the surgical field of view. Summary of the invention

[0003] As used herein, the term "proximal" refers to the end of the device or the portion thereof that is closer to the user, and the term "distal" refers to the end of the device or the portion thereof that is farther from the user.

[0004] The technical problem to be solved and the technical task proposed by the present invention are to improve the existing technology and provide a plasma scalpel to solve the problems that the scalpel in the current technology causes large surgical trauma, is difficult to perform precise surgical operations, and is inconvenient for surgical operations.

[0005] In order to solve the above technical problems, the technical solution of the present invention is:

[0006] A plasma surgical knife comprises a handle, a blade rod body and an electrode assembly, wherein the proximal end of the blade rod body is connected to the handle, and the distal end of the blade rod body is provided with an electrode assembly, wherein the electrode assembly comprises a return electrode, a wire-shaped emitter and an insulating member connected to the distal end of the blade rod body and electrically insulating and separating the return electrode from the emitter, wherein the emitter is curved in an arc shape as a whole and extends from the distal end face of the insulating member to the distal side face of the insulating member. The plasma scalpel described in the present invention adopts a filamentary electrode structure, which can form a more slender plasma, can accurately cut and ablate diseased tissue, reduce damage to normal tissue, improve surgical effects, and facilitate postoperative healing. The emitter is in an arc shape that bends and extends from the distal end face of the shank body to the distal side face of the shank body. Therefore, the plasma scalpel described in the present invention can flexibly use different positions of the emitter to perform surgical operations according to actual needs, thereby improving the convenience and accuracy of surgical operations. The part of the emitter located on the distal end face of the shank body can be used for surgical operations, the part of the emitter located on the distal side face of the shank body can be used for surgical operations, and the part of the emitter located on the distal side face of the shank body can be used for surgical operations. The transition part from the distal end face of the shank body to the side face can also be used for surgical operations. Surgical operations can be performed on target tissues in parts that are not easily exposed, such as the throat. The surgical operations have high precision and good effects, there is no need to replace surgical instruments during the operation, the surgical operation efficiency is high, the operation time is shortened, and the surgical expenses are saved.

[0007] Furthermore, the insulating part is provided with a suction port, which is connected to the suction tube connected to the handle through a suction channel along the knife rod body. The liquid with higher temperature and the cut tissue can be sucked away through the suction port to avoid affecting the surgical field of view and preventing the liquid with higher temperature from damaging normal tissue.

[0008] Furthermore, the emitter has a free end extending into the suction port, and the plasma formed on the free end of the emitter can further ablate and break up the tissue sucked away through the suction port, thereby preventing the sucked tissue from clogging the suction channel and suction tube, and ensuring a long-lasting and stable suction effect.

[0009] Furthermore, the free end of the emitter extends into the suction channel to ensure further ablation and fragmentation of the tissue.

[0010] Furthermore, the free end is located in the center of the suction channel, which improves the effect of tissue ablation and fragmentation, and avoids the situation where only a small part of the tissue close to the wall of the suction channel can be ablated and fragmented when the free end is offset. This can better prevent blockage and ensure a long-term and stable suction effect.

[0011] Furthermore, an injection channel is also provided in the knife rod body, one end of the injection channel is connected to the injection port located on one side of the distal end of the knife rod body, and the other end is connected to the injection tube connected to the handle. Physiological saline is transported from the injection port to the target tissue area, and the physiological saline conducts the return electrode and the emitter to form an ion state, forming a highly vaporized plasma layer on the emitter. The thin layer has enough energy to crush the molecular chains of human wound tissue in contact with the emitter, which is convenient for safe and convenient cutting of diseased tissue, with little damage to surrounding normal tissue. The temperature generated is between 40-70°C, and the thermal damage to normal tissue is extremely small. The plasma thin layer has an extremely high oxidizing effect and can kill bacteria on the wound surface.

[0012] Furthermore, the opening direction of the liquid injection port is inclined to the axial direction of the shank body.

[0013] Furthermore, the outlet cross section of the liquid injection port is arc-shaped.

[0014] Furthermore, the emitter includes an end face linear action portion located on one side of the distal end face of the insulating member, a side face linear action portion located on one side of the distal side face of the insulating member, and an arc-shaped transition section for connection. This structural design includes both linear action portions located on the end face and the side face, which can smoothly cut the diseased tissue on both sides; and an arc-shaped transition section for connecting the two end face action portions, which can finely cut smaller diseased tissues, further improving the effect of fine cutting on the basis of being able to perform fine cutting itself.

[0015] Furthermore, the cross-sectional size of the insulating member gradually decreases from the proximal end to the distal end, thereby avoiding blocking the line of sight, providing a good field of vision during surgical operations, and facilitating the doctor to clearly see the condition of the target position, thereby reducing surgical risks.

[0016] Furthermore, the insulating member is provided with inclined surfaces on both sides of the plane where the emitter is bent, so as to facilitate clear viewing of the condition of the target position and facilitate precise surgical operations.

[0017] Furthermore, the wire connection end of the emitter is inserted into the isolation hole opened on the insulating member, and an insulating layer is provided between the wire connection end and the isolation hole, thereby improving the insulation effect and extending the service life of the plasma scalpel.

[0018] Furthermore, the knife rod body is a bent structure, which facilitates surgical operations on target tissues in complex surgical environments.

[0019] Furthermore, the bending plane of the emitter coincides with, or is perpendicular to, or has an angle of 15 to 30 degrees with the bending plane of the knife rod body, so as to facilitate surgical operations on target tissues at specific locations.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The plasma scalpel of the present invention can accurately perform surgery on diseased tissues, reduce damage to normal tissues, improve surgical effects, and facilitate postoperative healing. The emitter is in an arc shape extending from the distal end face of the shank body to the side of the distal end of the shank body, and plasma can be formed in multiple specific positions. Different parts of the emitter can be used to perform surgery on target tissues in parts that are not easily exposed, such as the throat. The surgical operation has high precision and good effects, and there is no need to replace surgical instruments during the operation. The surgical operation efficiency is high, the operation time is shortened, and the surgical expenses are saved.

[0022] With the bipolar structure, the electrosurgical energy only acts on the target tissue, and does not require the cooperation of the negative electrode plate. It will not energize the entire human body, which can avoid the safety hazards caused by the easy detachment of the negative electrode plate of ordinary monopolar electrodes, will not burn the human body, and saves the trouble of using the negative electrode plate, making the operation safer and more convenient.

[0023] The field of vision during surgery is good, which allows doctors to clearly see the working status of the target location and reduce surgical risks;

[0024] Exudate and cut tissue can be sucked away, and the tissue passing through the suction port can be further ablated and broken up, effectively avoiding blockage problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the plasma scalpel of the first embodiment;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure of the electrode assembly of detail A;

[0027] Figure 3 It is a schematic structural diagram of the emitter side of the electrode assembly;

[0028] Figure 4 It is a schematic diagram of the cross-sectional structure of the connection between the emitter and the insulating member;

[0029] Figure 5 It is a schematic diagram of a structure in which the bending plane of the emitter coincides with the bending plane of the shank body;

[0030] Figure 6 It is a schematic diagram of a structure in which the plane where the emitter is bent is slightly left-biased relative to the plane where the shank body is bent;

[0031] Figure 7 It is a schematic diagram of a structure in which the plane where the emitter is bent is slightly right-angled relative to the plane where the shank body is bent;

[0032] Figure 8 It is a schematic diagram of a structure in which the bending plane of the emitter is perpendicular to the bending plane of the shank body;

[0033] Fig. 9 It is a schematic cross-sectional structure diagram of the connection between the emitter and the insulating member of the second embodiment;

[0034] Fig.10 It is a schematic cross-sectional structure diagram of the connection between the emitter and the insulating member of the third embodiment. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0036] The plasma scalpel disclosed in the embodiment of the present invention is easy to operate, can perform fine surgery on diseased tissue, causes little surgical trauma, avoids damaging the patient's normal vocal cords, is conducive to postoperative recovery, and has a good surgical effect.

[0037] Embodiment 1

[0038] like Figures 1 to 8A plasma surgical knife mainly comprises a handle 1, a shank body 2 and an electrode assembly 3, wherein the proximal end of the shank body 2 is connected to the handle 1, the diameter of the shank body 2 is preferably 2 mm to 4 mm, the distal end of the shank body 2 is provided with an electrode assembly 3, the electrode assembly 3 is electrically connected to a power supply assembly provided on the handle 1, the electrode assembly 3 comprises a wire-shaped emitter 31, the cross-sectional diameter (i.e., thickness) of the emitter 31 is 0.2 to 0.4 mm, the emitter 31 is bent and extended from the distal end face of the shank body 2 to the distal side face of the shank body 2, and the emitter 31 is bent in an arc shape as a whole (the arc shape here mainly includes two situations: 1. The emitter 31 is bent and extended from the distal end face of the shank body 2 to the distal side face of the shank body 2, and is in an arc shape without a linear action portion as a whole; 2. The emitter 31 comprises an end face linear action portion 314 located on one side of the distal end face of the insulating member 33, and a side face linear action portion 315 located on one side of the distal side face of the insulating member 33 and an arc-shaped transition section 316 for connection, which is an arc with a straight action portion as a whole). The wire-shaped emitter 31 can form a more slender plasma with a small and precise action area, which can perform surgery on the diseased tissue more accurately, reduce damage to normal tissue, and improve the surgical effect. Specifically, as in the second case, the emitter 31 includes an end face straight action portion 314 parallel to the distal end face of the insulating member 33, a side straight action portion 315 parallel to the distal side face of the insulating member 33, and an arc-shaped transition section 316 for connection, and the end face straight action portion 314, the side straight action portion 315, and the arc-shaped transition section 316 are each preferably 0.1 to 0.4 mm away from the corresponding surface of the insulating member 33, and can be set to be exactly the same distance; the emitter 31 can form plasma in multiple specific orientations, and the end face straight action portion 314 located at the distal end face of the knife rod body and the side straight action portion 315 located at the distal side face of the knife rod body can be used for surgery, and the end face straight action portion 314 can also be used to The arc-shaped transition section 316 between the side straight action portion 315 is used for surgical operation. The surgical operation is flexible and has good applicability. When performing surgical operation on the vocal cord, it can effectively ensure the normal voice function, which is not limited to vocal cord surgery.

[0039] The electrode assembly 3 also includes a return electrode 32 disposed on the blade body 2 and electrically insulated and isolated from the emitter 31 by an insulating member 33. In this embodiment, the return electrode 32 is a long metal tube, preferably a stainless steel tube. The return electrode 32 is disposed along the length direction of the blade body 2. An insulating sleeve is provided on the tube wall of the return electrode 32. The insulating sleeve can preferably be a heat shrink sleeve, and an exposed section is provided at the distal end of the return electrode 32. In this embodiment, the return electrode 32 is used as the blade body 2. An insulating member 33 is provided at the distal end of the return electrode 32 of the metal tube, that is, the insulating member 33 is connected to the distal end of the blade body 2, and the emitter 31 is connected to the insulating member 33, that is, the emitter 31 is bent and extended from the distal end face of the insulating member 33 to the distal side of the insulating member 33, and the insulating member 33 keeps the emitter 31 and the return electrode 32 electrically insulated and isolated;

[0040] In addition, a suction port 21 and a liquid injection port 22 are provided at one side of the distal end of the blade body 2. The suction port 21 is connected to the suction tube 11 connected to the handle 1 through a suction channel 23 along the blade body 2, and the liquid injection port 22 is connected to the liquid injection tube 12 connected to the handle 1 through a liquid injection channel 24 along the blade body 2. Specifically, the suction port 21 is provided on the insulating member 33, and the opening direction of the suction port 21 is toward the distal end side of the insulating member 33. An independent through pipe connected to the insulating member 33 is provided in the return pole 32 of the stainless steel tube to form the suction channel 23. The through-tube is connected to the suction port 21. A limiting step is set at one end of the suction port 21 connected to the through-tube. The end of the through-tube is inserted into the suction port 21 and abuts against the limiting step. The inner wall of the through-tube is flush with the inner part of the suction port 21. The area between the outer wall of the through-tube and the inner wall of the return pole 32 of the stainless steel tube constitutes the injection channel 24. The injection port 22 is opened on the wall surface of the exposed section at the far end of the emitter pole 31 of the stainless steel tube. The opening direction of the injection port 22 is inclined to the axial direction of the shank body 2, and the outlet cross-section of the injection port 22 is arc-shaped, and the water discharge is uniform. Specifically, as Figure 4 As shown, the cross-section of the suction port 21 is L-shaped. The suction port 21 in the figure mainly includes two parts, namely a vertical part arranged along the axial direction of the knife rod body 2, and a horizontal part perpendicular to the vertical part. The corner of the L-shaped suction channel (i.e., the connection between the vertical part and the horizontal part) is easily blocked, and a limiting step is arranged on the vertical part and located below the corner.

[0041] In this embodiment, the opening direction of the suction port 21 is set at the distal side of the insulating member 33 toward which the emitter 31 is directed, and the emitter 31 spans the mouth of the suction port 21. When the cut tissue is about to enter the suction port 21 to be sucked away, the emitter 31 can ablate and break up the tissue to prevent the tissue from blocking the suction port 21, the suction channel 23 and the suction tube 11, thereby ensuring that the suction pipeline is unobstructed. The emitter 31 has a structure that extends into the suction port 21. The free end 312 inside, the free end 312 penetrates into the insulating part 33 from the distal end face of the insulating part 33 and extends into the suction port 21, which can perform secondary ablation and fragmentation of the tissue, effectively avoiding blockage; in order to better solve the problem of easy blockage here, the free end 312 also extends into the suction channel 23, and the free end 312 is located in the central part of the suction channel 23, that is, the free end 312 is along the axial direction of the suction channel 23, and the length direction of the free end 312 is along the liquid flow direction of the suction channel 23, thereby ensuring the adequacy of the secondary ablation and fragmentation and improving the anti-blocking effect; the injection port 22 is also arranged on the same side of the suction port 21, and physiological saline can be better introduced from the injection port into the target tissue area where the emitter 31 acts, thereby ensuring the formation of a stable plasma thin layer on the emitter.

[0042] One end of the emitter 31 is a wire connection end 313, which is inserted into the isolation hole opened on the insulating member 33, and an insulating layer 311 is also provided between the wire connection end 313 and the isolation hole to enhance the insulation effect and extend the service life of the plasma scalpel. The free end 312 and the wire connection end 313 of the emitter 31 are both extended into corresponding positions through an arc-shaped smooth transition section.

[0043] In order to ensure a good surgical field of view, the cross-sectional size of the insulating member 33 gradually decreases from the proximal end to the distal end, and the insulating member 33 is provided with inclined surfaces on both sides of the plane where the emitter 31 is bent. The insulating member 33 is a symmetrical structure with the plane where the emitter 31 is bent as the symmetry plane. The taper formed by the inclined surfaces on both sides of the insulating member 33 is 25 to 30 degrees, which facilitates clear viewing of the target position, avoids the insulating member 33 being too large to perform surgery in a small area, and ensures the accuracy of the surgical operation.

[0044] like Figure 1 , Figures 5 to 8As shown, in the present embodiment, the blade rod body 2 is of a bent structure, and the bending plane of the emitter 31 and the bending plane of the blade rod body 2 may coincide with, be perpendicular to, or have an angle of 15 to 30° (or other applicable acute angles), and the positional relationship between the bending plane of the emitter 31 and the bending plane of the blade rod body 2 is fixed during manufacture, so as to facilitate surgery on target tissues in parts that are not easily exposed, such as the throat, and improve the convenience of surgical operation. For example, when the bending plane of the emitter 31 and the bending plane of the blade rod body 2 have an angle of ±15 to 30°, it is more convenient to perform surgery on patients with diseased tissue on the left and right vocal cords, and when the bending plane of the emitter 31 is perpendicular to the bending plane of the blade rod body 2, it is more convenient to perform surgery on patients with diseased tissue on the front of the vocal cords.

[0045] Embodiment 2

[0046] like Fig. 9 As shown, the difference from the first embodiment is that the liquid injection port 22 is arranged on the insulating member 33, specifically, it can be arranged on the distal end face of the insulating member 33, and an independent through pipe 2 connected to the insulating member 33 is arranged in the loop pole 32 of the stainless steel tube to form a liquid injection channel 24, and the through pipe 2 is connected to the liquid injection port 22.

[0047] Embodiment 3

[0048] like Fig.10 As shown, the difference from Example 1 is that the opening direction of the attraction opening 21 is set at the distal end face of the insulating member 33, the emitter 31 spans the mouth of the attraction opening 21, the emitter 31 can ablate and break up the tissue entering the attraction opening 21, and the emitter 31 has a free end 312 that penetrates into the attraction opening 21, and the free end 312 penetrates into the insulating member 33 from the distal side of the insulating member 33 and penetrates into the attraction opening 21.

[0049] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A plasma surgical knife, It is characterized in that The invention comprises a handle (1), a blade body (2) and an electrode assembly (3), wherein the proximal end of the blade body (2) is connected to the handle (1), and the distal end of the blade body (2) is provided with an electrode assembly (3), wherein the electrode assembly comprises a return electrode (32), a wire-shaped emitter (31) and an insulating member (33) connected to the distal end of the blade body (2) and electrically insulating and separating the return electrode (32) and the emitter (31), wherein the emitter (31) extends from the distal end surface of the insulating member (33) in an arc shape to the distal side surface of the insulating member (33); The insulating member (33) is provided with a suction opening (21), and the suction opening (21) is connected to a suction tube (11) connected to the handle (1) through a suction channel (23) along the blade body (2), and the emitter (31) has a free end (312) extending into the suction opening (21), and the free end (312) of the emitter (31) extends into the suction channel (23), and the free end (312) is located at the center of the suction channel (23).

2. The plasma surgical knife according to claim 1, It is characterized in that The blade body (2) is also provided with an injection channel (24), one end of which is in communication with an injection port (22) located at the distal end of the blade body (2), and the other end of which is in communication with an injection tube (12) connected to the handle (1).

3. The plasma surgical knife according to claim 1, It is characterized in that The emitter (31) comprises an end face straight action portion (314) located on one side of the distal end face of the insulating member (33), a side face straight action portion (315) located on one side of the distal side face of the insulating member (33), and an arc-shaped transition section (316) for connection.

4. The plasma surgical knife according to claim 1, It is characterized in that The cross-sectional dimensions of the insulating member (33) gradually decrease from the proximal end to the distal end.

5. The plasma surgical knife according to claim 4, It is characterized in that The insulating member (33) is provided with inclined surfaces on both sides of the plane where the emitter (31) is bent.

6. The plasma surgical knife according to claim 1, It is characterized in that The wire connection end (313) of the emitter (31) is inserted into an isolation hole opened on the insulating member (33), and an insulating layer (311) is provided between the wire connection end (313) and the isolation hole.

7. The plasma surgical knife according to any one of claims 1 to 6, It is characterized in that The knife rod body (2) is in a bent structure.

8. The plasma surgical knife according to claim 7, It is characterized in that The bending plane of the emitter (31) and the bending plane of the shank body (2) coincide with, are perpendicular to, or have an angle of 15 to 30 degrees.

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