A multifunctional high-frequency electric knife

Abstract

A multifunctional high-frequency electric knife comprises: a cutting unit, an injection unit, an elastic member, and a handle member; the cutting unit comprises an electrode part; the injection unit comprises an injection needle; the cutting unit is built into the injection unit; the elastic member is elastically crimped on the outer wall of the injection needle and the electrode part, and allows the injection needle to slide proximally and distally; the handle member comprises a first handle on the proximal side and a second handle on the distal side, the first handle is used to control the sliding of the cutting unit, and the second handle is used to control the sliding of the injection unit. The multifunctional high-frequency electric knife can realize the instrument exchange-free process during the operation to shorten the operation time, and can realize the adjustable and precise positioning of the protruding length of the electrode part to avoid using multiple different independent instruments during the operation and increasing the medical burden of the patient; in addition, it can check the electrode part and has the characteristics of large-flow injection for rapid injection.

Description

Technical Field

[0001] The invention relates to a high-frequency electric knife, in particular to a multifunctional high-frequency electric knife which integrates the functions of marking, injection, cutting, flushing and scraping and can be precisely positioned. Background Art

[0002] The present invention relates to a multifunctional high-frequency electric knife, in particular to an instrument that can realize low-cost passive injection and active high-frequency cutting, can realize the elimination of the need to exchange instruments during surgery to shorten the operation time, and can realize the high-frequency cutting electrode that can be adjusted in extension length and accurately positioned through a handle, thereby avoiding the use of multiple different instruments during surgery and causing an increase in the medical burden on patients.

[0003] Endoscopic submucosal dissection (ESD) refers to an endoscopic minimally invasive technique that uses high-frequency instruments to perform submucosal dissection on lesions larger than 2 cm. ESD is mainly indicated for early digestive tract cancer or precancerous lesions with extremely low lymph node metastasis rates. The steps include: ① marking; ② submucosal injection; ③ circumferential incision; ④ mucosal dissection; ⑤ wound treatment; ⑥ specimen treatment.

[0004] In traditional technology, high-frequency electric knives are used to achieve ① marking, ③ circumferential incision, and ④ mucosal stripping; injection needles are used to achieve ② submucosal injection; and electrocoagulation forceps are used to achieve ⑤ wound treatment. During mucosal stripping, submucosal injection can lift the lesion and separate it from the muscular layer, which is conducive to the removal of the lesion without damaging the muscular layer proper, and reducing the occurrence of complications such as perforation and bleeding. Therefore, during the operation, it is necessary to frequently replace high-frequency electric knives and injection needles for submucosal fluid infusion. Frequent replacement of injection needles and high-frequency electric knives greatly prolongs the operation time, increases the patient's anesthesia time, and leads to increased risks.

[0005] In order to improve this situation, there are many high-frequency electrosurgical units for needle-free injection on the market, but submucosal injection is divided into injection during mucosal resection and injection during submucosal stripping. The high-frequency electrosurgical unit for needle-free injection can achieve bulging of loose submucosal connective tissue, but because the high-frequency electrosurgical unit is limited by safety considerations and the knife length is limited, it cannot enter the submucosal layer. For the same injection volume, the bulging effect is not as good as that of the injection needle. As for injection during mucosal resection, compared with the loose submucosal layer, the mucosal layer cannot be pierced and injected without a needle tip under normal output pressure. ERBE's fine water jet separation equipment can provide a stable high-pressure water jet. Although it can penetrate the mucosal layer without a needle tip to achieve submucosal injection with the Haibo knife, the price of its water jet separation equipment makes ordinary hospitals shy away. This undoubtedly brings a great burden to patients and hospitals.

[0006] In addition, in the prior art, the minimum inner diameter of the injection channel is usually less than or equal to the inner diameter of the electric knife rod. Due to this limitation, the flow rate during injection is relatively small, or pressure needs to be increased to maintain a larger flow rate.

[0007] In summary, there is an urgent need to design an endoscopic treatment device that is low-cost, does not require replacement, can be extended from the same endoscopic channel, and has separate needle and knife.

[0008] In view of this, the present invention is proposed. Summary of the invention

[0009] In view of the technical problems existing in the prior art such as frequent instrument replacement and small injection flow rate, the present invention provides a multifunctional high-frequency electric knife, comprising: a cutting unit, an injection unit, an outer sheath, and a handle component; the cutting unit comprises an electrode part; the injection unit comprises an injection needle; the cutting unit is built into the injection unit; the electrode part can slide proximally relative to the injection needle and completely withdraw from the injection needle.

[0010] As in the aforementioned multifunctional high-frequency electric knife, the injection unit includes an injection needle, an injection needle seat, and a middle tube; the inner diameter of the middle tube is larger than the inner diameter of the injection needle; the proximal inner surface of the injection needle seat is a cone that tapers toward the distal end, which is used to guide the electrode part into the inner cavity of the injection needle.

[0011] As in the aforementioned multifunctional high-frequency electric knife, the injection needle is connected to the middle tube fluid through the injection needle seat.

[0012] As in the aforementioned multifunctional high-frequency electric knife, the proximal end of the injection needle seat and / or the distal end of the middle tube are provided with side holes or side grooves at the connection between the two, which are used to connect the inner cavity of the injection needle with the gap cavity between the middle tube and the outer sheath to form an injection channel.

[0013] As in the aforementioned multifunctional high-frequency electric knife, the handle component includes a first handle and a second handle, wherein the first handle is used to control the sliding of the cutting unit, and the second handle is used to control the sliding of the injection unit.

[0014] A multifunctional high-frequency electric knife is also provided, comprising: a cutting unit, an injection unit, an outer sheath, a handle component, and an elastic member; the cutting unit comprises an electrode part; the injection unit comprises an injection needle; the cutting unit is built into the injection unit; the elastic member is fixedly arranged in the inner cavity of the distal end of the outer sheath or on the outer tube wall, one end of the elastic member is fixed relative to the outer sheath, and the other end can be crimped on the injection needle and the outer wall of the electrode part to form a good contact; when the elastic member is elastically crimped onto the electrode part, the electrode part is stopped to prevent it from being completely retracted into the outer sheath; preferably, when the elastic member is elastically crimped onto the electrode part and engages with the groove or radial protrusion of the electrode part, the electrode part can be prevented from being completely retracted into the outer sheath.

[0015] The handle component includes a first handle and a second handle, wherein the first handle is used to control the sliding of the cutting unit, and the second handle is used to control the sliding of the injection unit.

[0016] As in the aforementioned multifunctional high-frequency electric knife, the elastic component includes a first spring sheet and a second spring sheet; the engagement of the second spring sheet with the electrode portion can realize the check of the electrode portion to prevent it from completely retracting into the outer sheath.

[0017] As in the aforementioned multifunctional high-frequency electric knife, the elastic component includes a first spring sheet and a second spring sheet; the first spring sheet and the second spring sheet are both arranged on the proximal side or the distal side of the distal end surface of the outer sheath; one end of the first spring sheet is fixed to the tube wall of the outer sheath, the first spring sheet extends obliquely toward the distal end, and the other end of the first spring sheet close to the axis at the distal end is a free end; the second spring sheet extends radially outward from the free end of the first spring sheet and is suspended in the air; when the first spring sheet and the second spring sheet are both arranged on the proximal side of the distal end surface of the outer sheath, the radial length of the second spring sheet is less than or equal to the difference between the radius of the outer sheath and the radius of the injection needle, and when the elastic component is elastically deformed, the injection needle is allowed to pass through; when the first spring sheet and the second spring sheet are both arranged on the distal side of the distal end surface of the outer sheath, the radial length of the second spring sheet is less than the radius of the outer sheath, and preferably the radial length of the second spring sheet is less than or equal to the difference between the radius of the outer sheath and the radius of the electrode portion at the crimped position.

[0018] As in the aforementioned multifunctional high-frequency electric knife, the elastic component includes a first spring sheet and a second spring sheet; the first spring sheet and the second spring sheet are respectively arranged on the distal and proximal sides of the distal surface of the outer sheath; one end of the first spring sheet is fixed to the inner cavity wall of the outer sheath, and the first spring sheet extends obliquely toward the distal end, and the other end of the distal end close to the axis is a free end; the second spring sheet extends radially outward from the free end of the first spring sheet and is suspended in the air, and the radial length of the second spring sheet is smaller than the radius of the outer sheath, preferably smaller than or equal to the difference between the radius of the outer sheath and the radius of the electrode portion at the crimped position, and more preferably smaller than or equal to the difference between the radius of the outer sheath and the radius of the rod-shaped electrode, so as to have a larger area for better electrocoagulation and marking.

[0019] As in the aforementioned multifunctional high-frequency electric knife, the elastic component includes a first spring sheet and a second spring sheet; the first spring sheet and the second spring sheet are both arranged on the proximal side, the distal side or on the distal and proximal sides of the distal surface of the outer sheath, respectively; one end of the first spring sheet is fixed to the tube wall of the outer sheath, the first spring sheet extends obliquely toward the distal end, and the other end of the distal end close to the axis is a free end; the second spring sheet extends axially from the free end of the first spring sheet toward the distal end.

[0020] As in the aforementioned multifunctional high-frequency electric knife, the elastic component also has a distal surface of the spring; the distal surface of the spring extends radially outward from the distal end of the second spring and is suspended in the air; the radial length of the distal surface of the spring is less than the radius of the outer sheath, and preferably the radial length of the second spring is less than or equal to the difference between the radius of the outer sheath and the radius of the electrode part at the crimped position, and more preferably less than or equal to the difference between the radius of the outer sheath and the radius of the rod-shaped electrode.

[0021] As in the aforementioned multifunctional high-frequency electric knife, the elastic component includes a first spring sheet, a second spring sheet, a spring sheet connecting portion, and a spring sheet distal surface; the spring sheet distal surface covers the distal end of the outer sheath; one end of the first spring sheet is fixed to the inner cavity wall of the outer sheath, and one end of the second spring sheet is electrically connected and fixed to the circumference of the spring sheet distal surface; the first spring sheet and the second spring sheet extend obliquely toward the distal and proximal sides respectively, and the other ends of the two are connected by a radially arranged spring sheet connecting portion; the spring sheet connecting portion and the axial center hole of the spring sheet distal surface form a step portion, which is used to realize the check of the radial protrusion to prevent it from retracting into the outer sheath.

[0022] As in the aforementioned multifunctional high-frequency electric knife, the radial length of the spring connection portion is less than or equal to the difference between the radius of the outer sheath and the radius of the injection needle, and when the elastic component is elastically deformed, the injection needle is allowed to pass through; the axial hole on the distal end surface of the spring allows the injection needle to pass through; the distal end surface of the spring can be electrically connected to the radial protrusion to jointly implement the electrocoagulation and marking functions.

[0023] As in the aforementioned multifunctional high-frequency electric knife, the proximal end of the elastic member or the first spring is also provided with a spring tubular section; the spring tubular section is adapted to the inner cavity or outer tube wall of the outer sheath, or is arranged in the tube wall of the outer sheath, and is used to firmly fix the elastic member to the outer sheath by bonding, welding or clamping.

[0024] As in the aforementioned multifunctional high-frequency electric knife, when the spring-shaped tubular section is arranged on the outer tube wall of the outer sheath, it is made of insulating material or provided with an insulating coating.

[0025] As in the aforementioned multifunctional high-frequency electric knife, the elastic component comprises a first spring sheet, a second spring sheet, a distal surface of the spring sheet, and a tubular section of the spring sheet; the first spring sheet and the second spring sheet are both arranged in the distal inner cavity of the outer sheath; one end of the first spring sheet is fixed to the inner cavity wall of the outer sheath, the first spring sheet extends obliquely toward the distal end, and the other end of the first spring sheet close to the axis on the distal side is a free end; the second spring sheet extends radially outward from the free end of the first spring sheet and is suspended in the air, the radial length of the second spring sheet is less than or equal to the difference between the radius of the outer sheath and the radius of the injection needle, and when the elastic component is elastically deformed, the injection needle is allowed to pass through; the tubular section of the spring sheet is adapted to the inner cavity of the outer sheath; the distal surface of the spring sheet covers the distal end of the outer sheath, and is electrically connected to the first spring sheet through the tubular section of the spring sheet; the radial length of the distal surface of the spring sheet is greater than or equal to the difference between the radius of the outer sheath and the radius of the injection needle, and its axial hole allows the injection needle to pass through; the distal surface of the spring sheet can jointly implement electrocoagulation and marking functions with the radial protrusion.

[0026] A multifunctional high-frequency electric knife is also provided, comprising: a cutting unit, an injection unit, an electrocoagulation unit, and a handle component; the cutting unit comprises an electrode part; the injection unit comprises an injection needle; the cutting unit is built into the injection unit; the electrocoagulation unit comprises a distal metal electrocoagulation ring and a conductive elastic member; the metal electrocoagulation ring is arranged in an inner cavity at the distal end of an outer sheath, and the inner cavity of the metal electrocoagulation ring allows the injection needle to slide through a layer; the elastic member is elastically crimped on the outer wall of the injection needle to form a good electrical connection and allow the injection needle to slide; the handle component comprises a first handle and a second handle, the first handle is used to control the sliding of the cutting unit, and the second handle is used to control the sliding of the injection unit.

[0027] As in the aforementioned multifunctional high-frequency electric knife, the electrode portion includes a rod-shaped electrode and a radial protrusion located at the distal end of the rod-shaped electrode; the electrode portion is slidably disposed in the injection needle, and the radial protrusion is electrically contacted and connected with the inner wall of the injection needle.

[0028] As in the aforementioned multifunctional high-frequency electric knife, when the elastic member is elastically pressed onto the rod-shaped electrode, the engagement with the groove or radial protrusion of the electrode portion can stop the radial protrusion from fully retracting the electrode portion into the outer sheath.

[0029] As in the aforementioned multifunctional high-frequency electric knife, the rod-shaped electrode comprises a conductive segment at the distal end and an insulating outer coating segment at the proximal end.

[0030] As in the aforementioned multifunctional high-frequency electric knife, the cutting unit also includes a conductive shaft and a connecting piece; the proximal end of the electrode portion and the distal end of the conductive shaft are fixed and electrically connected via the connecting piece arranged on the outside; the proximal end of the radial protrusion has a guiding member for guiding the radial protrusion to retract into the injection needle after protruding from the injection needle.

[0031] As in the aforementioned multifunctional high-frequency electric knife, the injection unit also includes an injection needle seat and a middle tube; the injection needle is made of a rigid conductive material, has a distal tip, and is fluidically connected to the outer sheath or the middle tube through the injection needle seat; the injection needle seat is arranged at the distal end of the middle tube, and the proximal inner surface of the injection needle seat is a cone that tapers toward the distal end, which is used to guide the electrode portion into the inner cavity of the injection needle.

[0032] As in the aforementioned multifunctional high-frequency electrosurgical knife, the inner cavity of the metal electrocoagulation ring is provided with an insulating layer; the distal end surface of the metal electrocoagulation ring is flush with the distal end surface of the outer sheath, or the metal electrocoagulation ring has an end protruding from the distal end surface of the outer sheath.

[0033] As in the aforementioned multifunctional high-frequency electric knife, the elastic component includes a first spring clip, a second spring clip, and a connecting portion for connecting the first spring clip and the second spring clip; the first spring clip is radially arranged and connected to the proximal end of the metal electrocoagulation ring; the first spring clip and the second spring clip are arranged at an obtuse angle, and the first spring clip is closer to the distal end than the second spring clip.

[0034] As in the aforementioned multifunctional high-frequency electric knife, the diameter of the connecting portion is smaller than the outer diameter of the injection needle. When the elastic member is elastically crimped onto the outer wall of the injection needle, the first spring sheet tilts toward the proximal end, and the connecting portion and the second spring sheet are electrically connected and crimped onto the outer wall of the injection needle. When the injection needle is retracted proximally to the nearest end of its stroke, the connecting portion is disconnected from the injection needle, and the first spring sheet resumes its radial orientation, so that the free end of the second spring sheet can be tightly crimped onto the rod-shaped electrode.

[0035] As in the aforementioned multifunctional high-frequency electric knife, the elastic component includes a radially arranged limit protrusion, a first spring sheet, a second spring sheet, and a connecting portion for connecting the first spring sheet and the second spring sheet; the first spring sheet is radially arranged and connected to the proximal end of the metal electrocoagulation ring; the first spring sheet and the second spring sheet are arranged at an obtuse angle, and the second spring sheet is closer to the distal end than the first spring sheet.

[0036] As in the aforementioned multifunctional high-frequency electric knife, the diameter of the connecting part is smaller than the outer diameter of the injection needle, so when the elastic member is elastically crimped on the outer wall of the injection needle, the first spring sheet tilts toward the distal end, and the connecting part and the second spring sheet are electrically connected and crimped on the injection needle; when the injection needle is withdrawn proximally to the nearest end of the stroke, the connecting part is disconnected from the injection needle, and the first spring sheet restores its radial orientation, so that the free end of the second spring sheet can be tightly crimped on the rod-shaped electrode; at this time, the rod-shaped electrode is slidable in both directions by pushing and pulling, so that the second spring sheet can act as a scraper to scrape off the condensate attached to the rod-shaped electrode to restore the cutting function of the rod-shaped electrode; the limiting protrusion abuts against the proximal end of the first spring sheet to prevent the first spring sheet from excessively deforming proximally during the sliding process of the rod-shaped electrode after the first spring sheet restores its radial orientation.

[0037] As in the aforementioned multifunctional high-frequency electric knife, there are multiple first spring pieces and multiple second spring pieces; the elastic member is formed by pressing annular spring pieces, and the connecting portion is formed into a groove structure with an arc-shaped cross-section by bending and pressing, and the connecting portion divides the annular spring piece into an outer ring portion and an inner ring portion; wherein the outer ring portion is used to form the first spring piece, and the inner ring portion is used to form the second spring piece; multiple first spring pieces are formed by cutting a number of wire grooves on the outer ring portion of the annular spring piece; and multiple second spring pieces are formed correspondingly by cutting a number of rectangular grooves, triangular grooves, trapezoidal grooves, fan-shaped grooves or fan-shaped grooves at positions corresponding to the wire grooves on the inner ring portion.

[0038] As in the aforementioned multifunctional high-frequency electric knife, the first handle is located at the proximal end of the second handle, and the two are coaxially arranged; the first handle includes a first core rod, a first positioning block, and a first handle sliding part; the distal end of the first core rod is fixedly connected to the proximal end of the second handle sliding part of the second handle; the proximal end of the first core rod is slidably arranged in the inner cavity of the first handle sliding part, and the two can slide relative to each other to drive the cutting unit to slide; the first positioning block is arranged at the distal end of the first handle sliding part, and the first positioning block is used to lock or release the sliding connection between the first core rod and the first handle sliding part.

[0039] As in the aforementioned multifunctional high-frequency electric knife, the second handle includes a reducing handle portion, a second core rod, a second positioning block, and a second handle sliding portion; the distal end of the reducing handle portion is connected to the proximal end of the outer sheath, and the second core rod is fixed to the proximal inner cavity of the reducing handle portion; the proximal end of the second core rod is slidably disposed in the inner cavity of the second handle sliding portion, the two are fluidically connected, and can slide relative to each other to drive the injection unit to slide, and a Luer connector is disposed on the second handle sliding portion; the second positioning block is disposed at the distal end of the second handle sliding portion, and the second positioning block is used to lock or release the sliding connection between the second core rod and the second handle sliding portion.

[0040] As in the aforementioned multifunctional high-frequency electric knife, the first positioning block and the second positioning block are nut tubes that cooperate with the corresponding threaded portions on the first handle sliding part and the second handle sliding part, and the threaded portions on the first handle sliding part and the second handle sliding part are both provided with a plurality of axial grooves.

[0041] As in the aforementioned multifunctional high-frequency electric knife, the first positioning block and the second positioning block are pressable elastic elements, which adjust the positioning position by cooperating with the positioning slots provided on the corresponding first core rod and the second core rod.

[0042] As in the aforementioned multifunctional high-frequency electrosurgical unit, when the injection needle protrudes from the distal end of the electrocoagulation unit and the electrode portion retracts proximally relative to the injection needle, detaches from the inner cavity of the injection needle, and retracts into the middle tube, liquid can be injected.

[0043] As in the aforementioned multifunctional high-frequency electrosurgical unit, when the rod-shaped electrode protrudes from the distal end of the electrocoagulation unit and the distal end of the proximal insulating outer coating segment also extends out of the distal end of the electrocoagulation unit, the electrocoagulation unit is powered off and the rod-shaped electrode is powered on to achieve electrocuting.

[0044] Based on the above technical solution, the present invention has the following advantages:

[0045] 1. It integrates the functions of check, marking, injection, cutting, flushing and scraping.

[0046] 2. When injecting liquid, the cutting unit retracts, which has the characteristics of large flow injection for rapid injection.

[0047] 3. When the injection unit is retracted and the cutting unit is exposed to the maximum extent, the condensation attached to the rod electrode can be scraped off. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is an overall schematic diagram of the first embodiment of the multifunctional high-frequency electric knife.

[0049] Figure 2A-2B Schematic diagram of the electrode part.

[0050] Figure 3 Schematic diagram of the injection unit.

[0051] Figures 4A-4H Schematic diagrams of different configurations of the elastic component when the electrode portion is elastically pressed.

[0052] Figure 5 It is an overall schematic diagram of the second embodiment of the multifunctional high-frequency electric knife.

[0053] Figure 6 Schematic diagram of the first configuration of the electrocoagulation unit.

[0054] Figure 7 Schematic diagram of the second configuration of the electrocoagulation unit.

[0055] Figure 8 A schematic diagram of the handle components.

[0056] Fig. 9 Schematic diagram of the distal structure of the multifunctional high-frequency electrosurgical unit when in “electrocoagulation” / “marking” mode.

[0057] Fig.10 Schematic diagram of the distal structure of the multifunctional high-frequency electrosurgical unit during “injection / flushing”.

[0058] Fig.11 Schematic diagram of the distal structure of the multifunctional high-frequency electric knife during "electric cutting".

[0059] Fig.12 Schematic diagram of the distal structure of the multifunctional high-frequency electric knife during "scraping".

[0060] Fig.13 Schematic diagram of the structure of the elastic component in the second embodiment.

[0061] Fig.14 Schematic diagrams of two configuration structures of the elastic component in the second embodiment.

[0062] Fig.15 This is a schematic diagram of marking the first core rod and the second core rod.

[0063] Description of reference numerals:

[0064] 1-cutting unit, 11-electrode part, 111-rod-shaped electrode, 1111-conductive segment, 1112-insulating outer coating segment, 112-distal radial protrusion, 12-conductive shaft, 13-connecting piece, 2-injection unit, 21-injection needle, 22-injection needle seat, 221-side hole or side groove, 23-middle tube, 3-electrocoagulation unit, 31-metal electrocoagulation ring, 311-insulating layer, 32-conductive elastic member, 3211-first spring sheet, 3212-second spring sheet, 3213-spring sheet connecting part, 322 -distal end face of the shrapnel, 323-tubular section of the shrapnel, 324-limiting ring, 4-outer sheath, 41-middle slender portion, 42-distal enlarged portion, 43-tapered transition portion, 421-distal retracted end face / distal end face, 5-handle component, 51-first handle, 511-first core rod, 512-first positioning block, 513-first handle sliding portion, 5131-electrical connection terminal, 52-second handle, 521-reducing handle portion, 522-second core rod, 523-second positioning block, 524-second handle sliding portion DETAILED DESCRIPTION

[0065] The technical contents of the present invention are described in detail with reference to the accompanying drawings and specific embodiments.

[0066] The embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention.

[0067] Some terms involved in the present invention are explained. The proximal end refers to the end close to the operator outside the body; the distal end refers to the end located in the target tissue to be treated inside the body; the axial direction refers to the longitudinal direction extending along the central axis of the device body; the radial direction refers to the direction perpendicular to the axial direction; the circumferential direction refers to the circumferential direction around the axial direction; the radial length refers to the length in the radial direction perpendicular to the axial direction, that is, the length in the radial direction on one side of the central axis.

[0068] like Figure 1 As shown, the multifunctional high-frequency electric knife of the present invention comprises: a cutting unit 1 , an injection unit 2 , an outer sheath 4 , a handle component 5 , and an elastic component 32 .

[0069] The cutting unit 1 includes an electrode portion 11 , a conductive shaft 12 , and a connecting member 13 . The cutting unit 1 is built in the injection unit 2 .

[0070] like Figure 3 As shown, the injection unit 2 includes an injection needle 21 , an injection needle seat 22 , and a middle tube 23 .

[0071] The electrode part 11 comprises a rod-shaped electrode 111 and a radial protrusion 112 at the distal end; the electrode part 11 can be slidably arranged in the injection needle 21. The proximal end of the electrode part 11 and the distal end of the conductive shaft 12 are fixed and electrically connected through the connector 13 arranged outside.

[0072] like Figure 2A As shown, the rod-shaped electrode 111 can be divided into a conductive segment 1111 at the distal end and an insulating outer coating segment 1112 at the proximal end. The proximal end of the radial protrusion 112 has a guide member for guiding the radial protrusion 112 to retract into the injection needle 21 after protruding from the injection needle 21. The radial protrusion 112 is preferably spherical, or has a protruding structure with a tapered structure that tapers toward the proximal end.

[0073] The conductive shaft 12 is a spiral member covered with an insulating coating, including a conductive spiral member and an insulating coating covering the surface of the spiral member, and the insulating coating is made of a polymer material or other insulating material that can be used in the human body. The proximal end of the conductive shaft 12 is connected to the electrical connection terminal 5131, and the distal end of the conductive shaft 12 is connected to the proximal end of the electrode part 11, so as to supply power to the electrode part 11.

[0074] like Figure 2B As shown, the electrode part 11 also has another configuration, which is a hollow structure with an inner cavity. A connecting filament can also be arranged between the distal end of the conductive shaft 12 and the connecting member 13, so that the inner cavity of the electrode part 11 is connected with the inner cavity of the middle tube 23 to form a part of the fluid infusion channel.

[0075] The injection needle 21 is made of a rigid conductive material and has a distal tip. Figure 3 As shown, it is in fluid communication with the middle tube 23 through the injection needle seat 22. In addition, an insulating layer may be provided on the outer wall of the injection needle 21. The proximal end of the injection needle 21 is connected to the inner cavity of the injection needle seat 22. The injection needle seat 22 is sleeved in the distal inner cavity of the middle tube 23, and the proximal inner surface of the injection needle seat 22 is a cone that tapers toward the distal end, which is used to guide the electrode part 11 into the inner cavity of the injection needle 21.

[0076] In addition, replacing Figure 1As shown, the proximal end of the injection needle seat 22 and / or the distal end of the middle tube 23 are provided with a side hole 221 or a side groove 221 at the connection between the two, which is used to connect the inner cavity of the injection needle 21 with the gap cavity between the middle tube 23 and the outer sheath 4 to form an injection channel.

[0077] like Figure 1 As shown, the elastic member 32 is a structure made of conductive material and symmetrical relative to the longitudinal axis. It is fixedly arranged in the inner cavity at the distal end of the outer sheath 4 and can be elastically crimped on the outer wall of the injection needle 21 and the electrode part 11. The proximal circumference of the elastic member 32 is fixed relative to the outer sheath 4, and the axial side of the elastic member 32 is inclined toward the distal end in the elastic crimping state. When the injection needle 21 is withdrawn and the electrode part 11 extends out of the injection needle 21, the elastic member 32 can be elastically crimped onto the rod-shaped electrode 111, and snap-fit ​​with the proximal end of the radial protrusion 112 to achieve a stop for the radial protrusion 112 to prevent it from retracting into the outer sheath 4. The elastic member 32 can also snap-fit ​​with the guide member at the proximal end of the radial protrusion 112 to achieve a stop. As a result, the guide member can snap-fit ​​with the elastic member 32 to achieve a stop, and can also guide the radial protrusion 112 to retract into the injection needle 21 after protruding from the injection needle 21. In addition, the elastic member 32 can also function as a scraper to scrape off condensation attached to the rod-shaped electrode 111 to restore the cutting function of the rod-shaped electrode 111 .

[0078] The elastic member 32 has a variety of configurations. All or part of the elastic member 32 is located proximal or distal to the distal retracted end surface / distal surface 421 of the outer sheath 4 , that is, the distal end in the distal inner cavity or outside of the outer sheath 4 . Figures 4A-4F Various configurations of the elastic member 32 in a state of elastically crimping the electrode portion are shown, and the description is focused on an example in which the elastic member 32 is entirely or partially located proximal to the distal retracted end surface / distal end surface 421 of the outer sheath 4 .

[0079] like Figure 4A In the configuration shown, the elastic member 32 includes a first elastic sheet 3211. The first elastic sheet 3211 is arranged on the proximal or distal side of the distal retracted end surface / distal end surface 421 of the outer sheath 4, and its proximal circumference is fixed to the inner cavity wall of the outer sheath 4 (such as Figure 4A above) or the outer wall (such as Figure 4A The first elastic sheet 3211 is provided in the outer sheath 4. The first elastic sheet 3211 extends obliquely toward the distal end, and the distal axial side thereof is a free end. When the elastic member 32 is elastically deformed, the first elastic sheet 3211 allows the injection needle 21 to pass through. When the first elastic sheet 3211 abuts against the radial protrusion 112, the first elastic sheet 3211 is used to realize a check on the radial protrusion 112 to prevent it from retracting into the outer sheath 4.

[0080] like Figure 4BIn the configuration shown, the elastic member 32 includes a first elastic piece 3211 and a second elastic piece 3212. The first elastic piece 3211 and the second elastic piece 3212 are arranged at an acute angle in the longitudinal section, and both are arranged on the proximal side of the distal retracted end face / distal face 421 of the outer sheath 4. The proximal periphery of the first elastic piece 3211 is fixed to the inner cavity wall of the outer sheath 4, and it extends obliquely toward the distal end, with the axial side as the free end; the second elastic piece 3212 extends radially outward from the free end of the first elastic piece 3211, and the periphery of the second elastic piece 3212 is suspended. The radial length of the second elastic piece 3212 on one side of the central axis is less than or equal to the difference between the radius of the outer sheath 4 and the radius of the injection needle 21, and when the elastic member 32 is elastically deformed, the hole formed by the second elastic piece 3212 allows the injection needle 21 to pass through. The second elastic piece 3212 and the axial center hole of the distal retracted end surface / distal end surface 421 form a step portion, which is used to achieve a check for the radial protrusion 112 to prevent it from retracting into the outer sheath 4.

[0081] In such Figure 4C In another configuration shown, the first elastic piece 3211 and the second elastic piece 3212 are respectively arranged on the distal and proximal sides of the distal retracted end surface / distal end surface 421 of the outer sheath 4. The radial length of the second elastic piece 3212 is also larger, and is set to be smaller than the radius of the outer sheath 4, preferably smaller than or equal to the difference between the radius of the outer sheath 4 and the radius of the rod-shaped electrode 111, so as to have a larger area for better implementation of electrocoagulation and marking.

[0082] like Figure 4D In the configuration shown, the elastic member 32 includes a first elastic piece 3211 and a second elastic piece 3212. The first elastic piece 3211 and the second elastic piece 3212 are both arranged on the proximal side of the distal retracted end face / distal face 421 of the outer sheath 4. The proximal circumference of the first elastic piece 3211 is fixed to the inner cavity wall of the outer sheath 4, and it extends obliquely toward the distal end, with the axial side as the free end; the second elastic piece 3212 extends axially toward the distal end from the free end of the first elastic piece 3211. When elastically deformed, the elastic member 32 allows the injection needle 21 to pass through. When abutting against the radial protrusion 112, the second elastic piece 3212 is used to realize the non-return of the radial protrusion 112 to prevent it from retracting into the outer sheath 4.

[0083] In addition, in Figure 4E In another configuration shown, a spring piece tubular section 323 is further provided at the proximal end of the first spring piece 3211. The spring piece tubular section 323 is adapted to the inner cavity of the outer sheath 4 and is used to firmly fix the elastic member 32 to the outer sheath 4 by bonding, welding or clamping.

[0084] In addition, if Figure 4FIn another configuration shown, the elastic member 32 further has a spring sheet distal end surface 322. The spring sheet distal end surface 322 extends radially outward from the distal end of the second spring sheet 3212, and its peripheral edge is suspended. When abutting against the radial protrusion 112, the spring sheet distal end surface 322 is used to realize the non-return of the radial protrusion 112 to prevent it from retracting into the outer sheath 4. The radial length of the spring sheet distal end surface 322 is less than the radius of the outer sheath 4, preferably less than or equal to the difference between the radius of the outer sheath 4 and the radius of the rod-shaped electrode 111, so that when electrically connected to the radial protrusion 112, it has a larger area to better implement electrocoagulation and marking.

[0085] like Figure 4G As shown, the elastic member 32 has another different configuration. The elastic member 32 includes a first elastic piece 3211, a second elastic piece 3212, an elastic piece connecting portion 3213, and an elastic piece distal surface 322. Different from the first and second configurations, the outer sheath 4 in this technical solution does not have a distal retracted end surface / distal surface 421, but is replaced by the elastic piece distal surface 322 of the elastic member 32 covering the distal end of the outer sheath 4. The axial sides of the first elastic piece 3211 and the second elastic piece 3212 extend obliquely toward the distal side and the proximal side respectively, and the two are connected by a radially arranged elastic piece connecting portion 3213. The elastic piece connecting portion 3213 can also be arranged obliquely so that its circumference is inclined toward the proximal side, that is, the angle α formed by the first elastic piece 3211 and the elastic piece connecting portion 3213 is a ratio Figure 4G The shrapnel connection part 3213 shown is arranged radially at a smaller acute angle. The proximal periphery of the first shrapnel 3211 is fixed to the inner cavity wall of the outer sheath 4, and the periphery of the second shrapnel 3212 is electrically connected and fixed to the periphery of the distal end surface 322 of the shrapnel. The radial length of the shrapnel connection part 3213 is less than the difference between the radius of the outer sheath 4 and the radius of the injection needle 21, and when the elastic member 32 is elastically deformed, the hole formed by the shrapnel connection part 3213 allows the injection needle 21 to pass through. In addition, the shrapnel connection part 3213 and the axial hole of the distal end surface 322 of the shrapnel constitute a step portion, which is used to realize the check of the radial protrusion 112 to prevent it from retracting into the outer sheath 4. The distal end surface 322 of the shrapnel covers the distal end of the outer sheath 4, and the radial length of the distal end surface 322 of the shrapnel is greater than or equal to the difference between the radius of the outer sheath 4 and the radius of the injection needle 21, and its axial hole allows the injection needle 21 to pass through. The distal end surface 322 of the spring piece can perform electrocoagulation and marking functions together with the radial protrusion 112 .

[0086] like Figure 4HAs shown, the elastic member 32 has another different configuration. The elastic member 32 includes a first elastic piece 3211, a second elastic piece 3212, an elastic piece distal surface 322, and an elastic piece tubular section 323. The first elastic piece 3211 and the second elastic piece 3212 are arranged at an acute angle in the longitudinal section, and both are arranged in the distal inner cavity of the outer sheath 4. The proximal periphery of the first elastic piece 3211 is fixed to the inner cavity wall of the outer sheath 4, and the first elastic piece 3211 extends obliquely toward the distal end, and its distal axial side is a free end; the second elastic piece 3212 extends radially outward from the free end of the first elastic piece 3211, and the periphery of the second elastic piece 3212 is suspended, and the radial length of the second elastic piece 3212 is less than or equal to the difference between the radius of the outer sheath 4 and the radius of the injection needle 21, and when the elastic member 32 is elastically deformed, the hole formed by the second elastic piece 3212 allows the injection needle 21 to pass through. The elastic sheet tubular section 323 is adapted to the inner cavity of the outer sheath 4; the elastic sheet distal surface 322 covers the distal end of the outer sheath 4 and is electrically connected to the first elastic sheet 3211 through the elastic sheet tubular section 323. The radial length of the elastic sheet distal surface 322 is greater than or equal to the difference between the radius of the outer sheath 4 and the radius of the injection needle 21, and its axial hole allows the injection needle 21 to pass through. The elastic sheet distal surface 322 can implement the electrocoagulation and marking functions together with the radial protrusion 112.

[0087] The aperture formed by the first spring piece 3211 at the axis of the multifunctional high-frequency electric knife in a natural state is smaller than the outer diameter of the rod-shaped electrode 111. When the first spring piece 3211 is elastically pressed onto the outer wall of the rod-shaped electrode 111 and / or the injection needle 21, the two are electrically connected. When the first spring piece 3211 is elastically pressed onto the outer wall of the rod-shaped electrode 111, it can also function as a scraper to scrape off the condensation attached to the rod-shaped electrode 111, so as to restore the cutting function of the rod-shaped electrode 111.

[0088] The outer sheath 4 may have a configuration in which the inner and outer diameters are uniform as a whole, or may have a configuration in which the inner and outer diameters are different. Figure 1 As shown, the outer sheath 4 has a middle slender portion 41, a distal enlarged portion 42 and a tapered transition portion 43 connected therebetween, wherein the inner diameter of the distal enlarged portion 42 is larger than the inner diameter of the middle slender portion 41, and the distal enlarged portion 42 is used to accommodate the injection needle 21 and the injection needle seat 22, and the distal end of the injection needle seat 22 is slidably matched with the inner cavity of the distal enlarged portion 42, and cooperates with the tapered transition portion 43 to limit the retraction of the injection needle 21. The proximal end of the injection needle seat 22 is slidably matched with the inner cavity of the middle slender portion 41.

[0089] In addition, in order to firmly fix the elastic member 32 to the outer sheath 4, Figures 4A-4GIn the embodiment shown and similar configurations thereof, which are arranged on the far side of the distal retracted end face / distal end face 421, the proximal end of the first elastic piece 3211 may be further provided with an elastic piece tubular section 323. The elastic piece tubular section 323 is adapted to the inner cavity or outer tube wall of the outer sheath 4, or is arranged in the tube wall of the outer sheath 4, and is used to firmly fix the elastic member 32 to the outer sheath 4 by means of bonding, welding or clamping. In addition, when the elastic piece tubular section 323 is arranged on the outer tube wall of the outer sheath 4, it is made of insulating material or provided with an insulating coating.

[0090] like Figure 8 As shown, the handle component 5 includes a first handle 51 at the proximal side and a second handle 52 at the distal side, wherein the first handle 51 is used to control the sliding of the cutting unit 1, and the second handle 52 is used to control the sliding of the injection unit 2. The first handle 51 is located at the proximal end of the second handle 52, and the two are coaxially arranged.

[0091] The first handle 51 includes a first core rod 511, a first positioning block 512, and a first handle sliding portion 513. The distal end of the first core rod 511 is fixedly connected to the proximal end of the second handle sliding portion 524 of the second handle 52. The proximal end of the first core rod 511 is slidably disposed in the inner cavity of the first handle sliding portion 513, and the two can slide relative to each other to drive the cutting unit 1 to slide. The first positioning block 512 is disposed at the distal end of the first handle sliding portion 513, and the first positioning block 512 is used to lock or release the sliding connection between the first core rod 511 and the first handle sliding portion 513.

[0092] like Fig.15 As shown, the first core rod 511 is provided with scales and marked with three functional positions. The three functional positions are respectively electrocuting, electrocoagulation, and injection / flushing from far to near, and a reciprocating arrow is used to mark "scraping" between the "electrocuting" and "electrocoagulation" positions to indicate that the coagulation attached to the rod-shaped electrode 111 can be scraped off by sliding between the two.

[0093] An electrical connection terminal 5131 is disposed in the inner cavity at the proximal end of the first handle sliding portion 513 , and is used to be connected to a high-frequency generator via a connecting cable. The electrical connection terminal 5131 is electrically connected to the conductive shaft 12 .

[0094] The second handle 52 includes a reducing handle portion 521, a second core rod 522, a second positioning block 523, and a second handle sliding portion 524. The distal end of the reducing handle portion 521 is connected to the proximal end of the outer sheath 4, and the second core rod 522 is fixed to the proximal inner cavity of the reducing handle portion 521. The proximal end of the second core rod 522 is slidably disposed in the inner cavity of the second handle sliding portion 524, and the two are fluidically connected and can slide relative to each other to drive the injection unit 2 to slide. The second handle sliding portion 524 is provided with a Luer connector. The distal end of the second handle sliding portion 524 is provided with the second positioning block 523, and the second positioning block 523 is used to lock or release the sliding connection between the second core rod 522 and the second handle sliding portion 524.

[0095] The second core rod 522 is provided with scales and marked with three functional positions, which are injection / flushing, electrocoagulation / electric cutting, and scraping from far to near.

[0096] The first positioning block 512 and the second positioning block 523 are nut tubes that cooperate with the threaded parts on the corresponding first handle sliding part 513 and the second handle sliding part 524. The threaded parts on the first handle sliding part 513 and the second handle sliding part 524 are both provided with a plurality of axial grooves.

[0097] The first positioning block 512 and the second positioning block 523 may also be pressable elastic elements, which can adjust the positioning position by cooperating with the positioning slots provided on the corresponding first core rod 511 and the second core rod 522 .

[0098] For the above-mentioned Figures 4A-4H Using the configuration shown, the process is as follows:

[0099] "Electrocoagulation" / "Marking"

[0100] The first handle sliding part 513 is set at the "electrocoagulation" position, and the second handle sliding part 524 is set at the "electrocoagulation / electrocutting" position, and is positioned by the corresponding first positioning block 512 and the second positioning block 523. At this time, the injection needle 21 is in the outer sheath 4, and the distal tip does not protrude from the distal end of the outer sheath 4; the electrocoagulation / marking is implemented through the radial protrusion 112, or the elastic member 32 is electrically connected to the radial protrusion 112, so as to energize the second spring piece 3212 / the spring piece distal end surface 322, and implement the electrocoagulation / marking.

[0101] "Injection / Flush"

[0102] The first handle sliding part 513 and the second handle sliding part 524 are both set to the "injection / flushing" position to push out the injection needle 21, retract the rod-shaped electrode 111, and position it through the corresponding first positioning block 512 and the second positioning block 523. At this time, the injection needle 21 protrudes at the distal end of the outer sheath 4, and the electrode part 11 retracts toward the proximal end relative to the injection needle 21, detaches from the inner cavity of the injection needle 21, and retracts to the inner / side hole 221 or the side groove 221 of the middle tube 23, thereby achieving a large flow injection, thereby accelerating the "bulge" process.

[0103] "Electrocutaneous resection"

[0104] The first handle sliding part 513 is set at the "electrocut" position, and the second handle sliding part 524 is set at the "electrocoagulation / electrocut" position, so as to push out the rod-shaped electrode 111, retract the injection needle 21, and position it through the corresponding first positioning block 512 and second positioning block 523. At this time, the rod-shaped electrode 111 protrudes from the distal end of the outer sheath 4, and the conductive segment 1111 at the distal end is completely protruded, and the distal end of the insulating outer coating segment 1112 at the proximal end also protrudes out of the distal end of the outer sheath 4. The elastic member 32 is elastically pressed against the insulating outer coating segment 1112, thereby disconnecting the power of the elastic member 32 and only energizing the rod-shaped electrode 111, so as to safely perform the electrocuting operation.

[0105] "Scrape"

[0106] The second handle sliding part 524 is set in the "electrocoagulation / electrocutting" position; or the second handle sliding part 524 is set in the "scraping" position to retract the injection needle 21 to the nearest end of the stroke, thereby exposing the rod-shaped electrode 111 outside the injection needle 21 to the greatest extent, and positioning it through the second positioning block 523.

[0107] At this time, the elastic member 32 is disconnected from the injection needle 21, so that the free end of the first spring sheet 3211 can tightly press the rod-shaped electrode 111. The first handle sliding part 513 is pushed and pulled back and forth between the "electric cutting" and "electric coagulation" positions to scrape off the coagulation attached to the rod-shaped electrode 111 and restore the cutting function of the rod-shaped electrode 111.

[0108] In another embodiment, if Figure 5 As shown, the multifunctional high-frequency electrosurgical knife further comprises a metal electrocoagulation ring 31 arranged in the inner cavity at the distal end of the outer sheath 4; the metal electrocoagulation ring 31 is located at the distal end of the conductive elastic component 32, and the two are electrically connected.

[0109] like Figure 6As shown, the electrocoagulation unit 3 includes the distal metal electrocoagulation ring 31 and a conductive elastic member 32. The metal electrocoagulation ring 31 is arranged in the inner cavity at the distal end of the outer sheath 4, and the inner cavity of the metal electrocoagulation ring 31 allows the injection needle 21 to slide through, and is provided with an insulating layer 311. The distal end surface of the metal electrocoagulation ring 31 is flush with the distal end surface of the outer sheath 4, or the metal electrocoagulation ring 31 has an end protruding from the distal end surface of the outer sheath 4 to form an end cap structure.

[0110] The elastic member 32 is elastically pressed against the outer wall of the injection needle 21 to electrically connect the two and allow the injection needle 21 to slide forward and backward. The electrode part 11 is slidably arranged in the injection needle 21, and the radial protrusion 112 is electrically connected to the inner wall of the injection needle 21.

[0111] The elastic member 32 includes a first elastic sheet 3211, a second elastic sheet 3212, and an elastic sheet connecting portion 3213 for connecting the first elastic sheet 3211 and the second elastic sheet 3212. The first elastic sheet 3211 is radially arranged and connected to the proximal end of the metal electrocoagulation ring 31. The first elastic sheet 3211 and the second elastic sheet 3212 are arranged at an obtuse angle in the longitudinal section, and the first elastic sheet 3211 is closer to the distal end than the second elastic sheet 3212.

[0112] The diameter of the elastic sheet connection part 3213 is smaller than the outer diameter of the injection needle 21, so when the elastic member 32 is elastically pressed against the outer wall of the injection needle 21, the first elastic sheet 3211 tilts toward the distal end or the proximal end, and the elastic sheet connection part 3213 and the second elastic sheet 3212 are electrically connected and pressed against the outer wall of the injection needle 21. When the injection needle 21 is withdrawn to the most proximal end of the stroke, the elastic sheet connection part 3213 is disconnected from the injection needle 21, and the first elastic sheet 3211 resumes the radial orientation, as shown in FIG. Fig.14 As shown, the free end of the second spring piece 3212 can be tightly pressed against the rod-shaped electrode 111. At this time, the rod-shaped electrode 111 can slide far and near by pushing and pulling, so that the second spring piece 3212 can act as a scraper to scrape off the condensate attached to the rod-shaped electrode 111 to restore the cutting function of the rod-shaped electrode 111.

[0113] like Fig.13 As shown, there are multiple first spring pieces 3211 and second spring pieces 3212, and both are annular as a whole. The elastic member 32 is formed by pressing annular spring pieces, and the spring piece connecting portion 3213 is formed by bending and pressing to form a groove structure with an arc-shaped longitudinal section. The spring piece connecting portion 3213 divides the annular spring piece into an outer ring portion and an inner ring portion; wherein the outer ring portion is used to form the first spring piece 3211, and the inner ring portion is used to form the second spring piece 3212. A plurality of first spring pieces 3211 are formed by cutting a plurality of wire grooves in the outer ring portion of the annular spring piece; a plurality of second spring pieces 3212 are formed correspondingly by cutting a plurality of rectangular grooves, triangular grooves, trapezoidal grooves, fan-shaped grooves or fan-shaped grooves at positions corresponding to the wire grooves in the inner ring portion.

[0114] In addition, the electrocoagulation unit 3 can also be Figure 7 The elastic member 32 includes a radially arranged limit ring 324, a first elastic sheet 3211, a second elastic sheet 3212, and an elastic sheet connecting portion 3213 for connecting the first elastic sheet 3211 and the second elastic sheet 3212. The first elastic sheet 3211 is radially arranged and connected to the proximal end of the metal electrocoagulation ring 31. The first elastic sheet 3211 and the second elastic sheet 3212 are arranged at an obtuse angle in the longitudinal section, and the second elastic sheet 3212 is closer to the distal end than the first elastic sheet 3211.

[0115] The diameter of the spring connecting portion 3213 is smaller than the outer diameter of the injection needle 21, so when the elastic member 32 is elastically pressed against the outer wall of the injection needle 21, the first spring 3211 tilts toward the distal end, and the spring connecting portion 3213 and the second spring 3212 are electrically connected and pressed against the injection needle. When the injection needle 21 is withdrawn to the nearest end of the stroke toward the proximal end, the spring connecting portion 3213 is disconnected from the injection needle 21, and the first spring 3211 restores the radial orientation, so that the free end of the second spring 3212 can be tightly pressed against the rod-shaped electrode 111. At this time, the rod-shaped electrode 111 is pushed and pulled to achieve the sliding of the rod-shaped electrode 111, so that the second spring 3212 can act as a scraper to scrape off the condensate attached to the rod-shaped electrode 111 to restore the cutting function of the rod-shaped electrode 111. The limiting ring 324 abuts against the proximal end of the first elastic sheet 3211 to prevent the first elastic sheet 3211 from excessively deforming toward the proximal side during the sliding process of the rod-shaped electrode 111 after the first elastic sheet 3211 restores the radial orientation.

[0116] The usage process is as follows:

[0117] "Electrocoagulation" / "Marking"

[0118] like Fig. 9 As shown, the first handle sliding part 513 is set at the "electrocoagulation" position, and the second handle sliding part 524 is set at the "electrocoagulation / electrocutting" position, and is positioned by the corresponding first positioning block 512 and the second positioning block 523. At this time, the injection needle 21 is in the outer sheath 4, and the distal tip does not protrude from the distal end of the electrocoagulation unit 3. The spring connecting part 3213 is electrically connected to the injection needle 21 and the radial protrusion 112, so that the metal electrocoagulation ring 31 of the electrocoagulation unit 3 is energized to achieve electrocoagulation / marking.

[0119] "Injection / Flush"

[0120] like Fig.10As shown, the first handle sliding part 513 and the second handle sliding part 524 are both set in the "injection / rinsing" position to push out the injection needle 21, retract the rod-shaped electrode 111, and position it through the corresponding first positioning block 512 and the second positioning block 523. At this time, the injection needle 21 protrudes at the distal end of the electrocoagulation unit 3, and the electrode part 11 retracts toward the proximal end relative to the injection needle 21, detaches from the inner cavity of the injection needle 21, and retracts into the middle tube 23, thereby achieving a large flow injection, thereby accelerating the "bulge" process.

[0121] "Electrocutaneous resection"

[0122] like Fig.11 As shown, the first handle sliding part 513 is set at the "electrocutting" position, and the second handle sliding part 524 is set at the "electrocoagulation / electrocutting" position, so as to push out the rod-shaped electrode 111, retract the injection needle 21, and position it through the corresponding first positioning block 512 and second positioning block 523. At this time, the rod-shaped electrode 111 protrudes at the distal end of the electrocoagulation unit 3, and the conductive segment 1111 at the distal end is completely protruded, and the distal end of the insulating outer coating segment 1112 at the proximal end also extends out of the distal end of the electrocoagulation unit 3, thereby realizing the power-off of the electrocoagulation unit 3. The rod-shaped electrode 111 is energized to realize electrocuting.

[0123] "Scrape"

[0124] like Fig.12 As shown, the second handle sliding part 524 is set in the "scraping" position to retract the injection needle 21 to the nearest end of the stroke, so that the rod-shaped electrode 111 is exposed to the maximum extent outside the injection needle 21 and positioned by the second positioning block 523. At this time, the spring connecting part 3213 is disconnected from the injection needle 21, and the first spring 3211 is restored to the radial orientation, so that the free end of the second spring 3212 can be tightly pressed against the rod-shaped electrode 111. The first handle sliding part 513 is pushed and pulled back and forth between the "electrical cutting" and "electrical coagulation" positions to scrape off the coagulation attached to the rod-shaped electrode 111 and restore the cutting function of the rod-shaped electrode 111.

[0125] The above structure can realize marking, injection, cutting, flushing, scraping, and can be precisely positioned. When injecting liquid, the cutting unit retracts, and has the characteristics of large injection flow rate for rapid injection. When the injection unit is retracted and the cutting unit is exposed to the maximum extent, the condensation attached to the rod electrode can be scraped off. No replacement is required during the operation to shorten the operation time and avoid the use of multiple different instruments during the operation to increase the medical burden of the patient.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multifunctional high-frequency electric knife, comprising: A cutting unit (1), an injection unit (2), an outer sheath (4), a handle component (5), and an elastic member (32); The cutting unit (1) comprises an electrode portion (11), wherein the distal end of the electrode portion (11) has a groove or a radial protrusion (112); The injection unit (2) comprises an injection needle (21); The cutting unit (1) is built into the injection unit (2); Features: The elastic member (32) is fixedly arranged at the distal end of the outer sheath (4); one end of the elastic member (32) is fixed relative to the outer sheath (4), and the other end can be crimped onto the outer wall of the injection needle (21) or the electrode portion (11); when the injection needle (21) is withdrawn and the electrode portion (11) extends out of the injection needle (21) and then leaks out of the groove or radial protrusion (112), the elastic engagement between the elastic member (32) and the electrode portion (11) can prevent the electrode portion (11) from completely retracting into the outer sheath (4); The handle component (5) comprises a first handle (51) and a second handle (52); the first handle (51) is used to control the sliding of the cutting unit (1), and the second handle (52) is used to control the sliding of the injection unit (2).

2. The multifunctional high-frequency electric knife according to claim 1, characterized in that: The elastic member (32) comprises a first elastic sheet (3211) and a second elastic sheet (3212); one end of the first elastic sheet (3211) is fixed to the tube wall of the outer sheath (4); the first elastic sheet (3211) extends obliquely toward the distal end, and the other end of the first elastic sheet (3211) close to the axis at the distal end is a free end; the second elastic sheet (3212) extends radially outward from the free end of the first elastic sheet (3211) and is suspended in the air; wherein: Both the first elastic sheet (3211) and the second elastic sheet (3212) are arranged on the proximal side of the distal inwardly contracted end surface (421) of the outer sheath (4); the radial length of the second elastic sheet (3212) is less than or equal to the difference between the radius of the outer sheath (4) and the radius of the injection needle (21); or, The first elastic sheet (3211) and the second elastic sheet (3212) are respectively arranged on the distal and proximal sides of the distal inwardly contracted end surface (421) of the outer sheath (4); the radial length of the second elastic sheet (3212) is smaller than the radius of the outer sheath (4); or, Both the first elastic sheet (3211) and the second elastic sheet (3212) are arranged on the far side of the far end surface of the outer sheath (4); the radial length of the second elastic sheet (3212) is smaller than the radius of the outer sheath (4).

3. The multifunctional high-frequency electric knife according to claim 1, characterized in that: The elastic member (32) comprises a first elastic sheet (3211) and a second elastic sheet (3212); one end of the first elastic sheet (3211) is fixed to the tube wall of the outer sheath (4); the first elastic sheet (3211) extends obliquely toward the distal end, and the other end of the first elastic sheet (3211) close to the axis at the distal end is a free end; the second elastic sheet (3212) extends axially from the free end of the first elastic sheet (3211) toward the distal end; wherein, The first elastic sheet (3211) and the second elastic sheet (3212) are both arranged on the proximal side of the distal end surface of the outer sheath (4); or, The first elastic sheet (3211) and the second elastic sheet (3212) are respectively arranged on the distal and proximal sides of the distal end surface of the outer sheath (4); or, The first elastic sheet (3211) and the second elastic sheet (3212) are both arranged on the far side of the far end surface of the outer sheath (4).

4. The multifunctional high-frequency electric knife according to claim 3, characterized in that: The elastic member (32) further comprises a spring sheet distal end surface (322); the spring sheet distal end surface (322) extends radially outward from the distal end of the second spring sheet (3212) and is suspended in the air; the radial length of the spring sheet distal end surface (322) is smaller than the radius of the outer sheath (4).

5. The multifunctional high-frequency electric knife according to claim 1, characterized in that: The elastic member (32) comprises a first elastic sheet (3211), a second elastic sheet (3212), an elastic sheet connecting portion (3213), and an elastic sheet distal surface (322); the elastic sheet distal surface (322) covers the distal end of the outer sheath (4); one end of the first elastic sheet (3211) is fixed to the inner cavity wall of the outer sheath (4), and one end of the second elastic sheet (3212) is electrically connected and fixed to the circumference of the elastic sheet distal surface (322); the first elastic sheet (3211) and the second elastic sheet (3212) extend obliquely toward the distal side and the proximal side, respectively, and the other ends of the two are connected via a radially arranged elastic sheet connecting portion (3213); the elastic sheet connecting portion (3213) and the axial center hole of the elastic sheet distal surface (322) form a step portion, which is used to realize a non-return function for the electrode portion (11) to prevent it from completely retracting into the outer sheath (4).

6. The multifunctional high-frequency electric knife according to claim 5, characterized in that: The radial length of the spring connecting portion (3213) is less than or equal to the difference between the radius of the outer sheath (4) and the radius of the injection needle (21); the axial hole of the spring distal end surface (322) allows the injection needle (21) to pass through; the spring distal end surface (322) can be electrically connected to the electrode portion (11) to jointly implement the electrocoagulation and marking functions.

7. The multifunctional high-frequency electric knife according to claim 6, characterized in that: A spring-piece tubular section (323) is also provided at the proximal end of the elastic member (32) or the first spring piece (3211); the spring-piece tubular section (323) is adapted to the inner cavity or outer tube wall of the outer sheath (4), or is provided in the tube wall of the outer sheath (4), and is used to firmly fix the elastic member (32) to the outer sheath (4).

8. The multifunctional high-frequency electric knife according to claim 1, characterized in that: The elastic member (32) comprises a first elastic piece (3211), a second elastic piece (3212), an elastic piece distal surface (322), and an elastic piece tubular section (323); the first elastic piece (3211) and the second elastic piece (3212) are both arranged in the distal inner cavity of the outer sheath (4); one end of the first elastic piece (3211) is fixed to the inner cavity wall of the outer sheath (4); the first elastic piece (3211) extends obliquely toward the distal end, and the other end of the first elastic piece (3211) close to the axis at the distal end is a free end; the second elastic piece (3212) extends radially outward from the free end of the first elastic piece (3211) and is suspended in the air; the second elastic piece (3212) The radial length of the spring (3212) is less than or equal to the difference between the radius of the outer sheath (4) and the radius of the injection needle (21); the spring tubular section (323) is compatible with the inner cavity of the outer sheath (4); the spring distal surface (322) covers the distal end of the outer sheath (4) and is electrically connected to the first spring (3211) through the spring tubular section (323); the radial length of the spring distal surface (322) is greater than or equal to the difference between the radius of the outer sheath (4) and the radius of the injection needle (21), and its axial hole allows the injection needle to pass through; the spring distal surface (322) can jointly implement electrocoagulation and marking functions with the electrode part (11).

9. A multifunctional high-frequency electric knife, comprising: Cutting unit (1), injection unit (2), electrocoagulation unit (3), and handle component (5); The cutting unit (1) comprises an electrode portion (11), wherein the electrode portion (11) comprises a rod-shaped electrode (111) and a radial protrusion (112) located at the distal end of the rod-shaped electrode (111); The injection unit (2) comprises an injection needle (21); The cutting unit (1) is built into the injection unit (2); Features: The electrocoagulation unit (3) comprises a distal metal electrocoagulation ring (31) and a conductive elastic member (32); the metal electrocoagulation ring (31) is arranged in the inner cavity at the distal end of the outer sheath (4); the elastic member (32) is elastically crimped onto the outer wall of the injection needle (21) to be electrically connected, and allows the injection needle (21) and the electrode part (11) to slide; the electrode part (11) is slidably arranged in the injection needle (21), and the radial protrusion (112) is electrically contacted and connected with the inner wall of the injection needle (21); The handle component (5) comprises a first handle (51) and a second handle (52); the first handle (51) is used to control the sliding of the cutting unit (1), and the second handle (52) is used to control the sliding of the injection unit (2).

10. The multifunctional high-frequency electric knife according to claim 9, characterized in that: When the elastic member (32) is elastically pressed onto the rod-shaped electrode (111), engagement with the radial protrusion (112) can stop the radial protrusion (112) to prevent the electrode part (11) from completely retracting into the outer sheath (4).

11. The multifunctional high-frequency electric knife according to any one of claims 1 to 9, characterized in that: The cutting unit (1) further comprises a conductive shaft (12) and a connecting piece (13); the proximal end of the electrode portion (11) and the distal end of the conductive shaft (12) are fixed and electrically connected via the connecting piece (13); and the proximal end of the radial protrusion (112) at the distal end of the electrode portion (11) comprises a guiding member for guiding the radial protrusion (112) to retract into the injection needle (21) after protruding from the injection needle (21).

12. The multifunctional high-frequency electric knife according to any one of claims 1 to 9, characterized in that: The injection unit (2) further comprises an injection needle seat (22) and a middle tube (23); the injection needle (21) is made of a rigid conductive material and has a distal tip portion, which is fluidically connected to the outer sheath (4) or the middle tube (23) via the injection needle seat (22); the injection needle seat (22) is arranged at the distal end of the middle tube (23), and the inner surface of the proximal end of the injection needle seat (22) is a cone that tapers toward the distal end, and is used to guide the electrode portion (11) into the inner cavity of the injection needle (21).

13. The multifunctional high-frequency electric knife according to claim 9, characterized in that: The inner cavity of the metal electrocoagulation ring (31) allows the injection needle (21) to slide through, and the inner cavity of the metal electrocoagulation ring (31) is provided with an insulating layer (311); the distal surface of the metal electrocoagulation ring (31) is flush with the distal surface of the outer sheath (4), or the metal electrocoagulation ring (31) has an end that protrudes from the distal surface of the outer sheath (4).

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