Length-adjustable water-injection multifunctional electrosurgical knife

Abstract

A length-adjustable water-injection multifunctional electrosurgical knife. A distal end of a delivery tube is fixedly connected to an I-knife body by means of a connecting tube, and a proximal end of the delivery tube is fixed on a main body handle; a proximal end of an O-knife body is fixedly connected to a distal end of an inner sheath tube; the inner sheath tube is sleeved outside the delivery tube; a proximal end of the inner sheath tube is fixedly connected to an inner sheath handle; an outer sheath tube is sleeved outside the inner sheath tube; a distal end of the outer sheath tube is limited by a ceramic head; a proximal end of the outer sheath tube is fixedly connected to an outer sheath handle; the relative position of the outer sheath handle and the main body handle can be moved and changed so as to adjust the extension length of the overall knife tip, and the relative position of the inner sheath handle and the outer sheath handle can be moved and changed so as to realize the switching between the O-knife and I-knife bodies. The present solution can meet the requirements of surgeons for electrosurgical knifes having different lengths during surgery, and provides multiple functions in a single electrosurgical knife.

Description

A multi-functional electrosurgical unit with adjustable length for water injection Technical Field

[0001] This disclosure belongs to the field of medical device technology, and in particular relates to a length-adjustable water-injection multifunctional electrosurgical unit. Background Technology

[0002] Common electrosurgical devices used for ESD on the market include needle knives, IT knives (with ceramic tips), hook knives, triangular knives, and Flush knives (with flushing holes in the tip). Each type of knife has its own characteristics: the rod-shaped electrode of the needle knife can quickly mark and cut the mucosa; the IT knife tip is protected by a ceramic insulator to prevent cutting unnecessary areas when peeling off the mucosal layer, thus preventing perforation and bleeding; the L-shaped tip of the hook knife can be rotated to a suitable angle to quickly cut the edge of the lesion; the three-lobed radial electrode of the triangular knife is beneficial for marking and cauterizing bleeding points for hemostasis; the Flush knife tip has flushing holes to rinse bleeding points during the operation and improve the field of vision.

[0003] During endoscopic submucosal dissection, the surgeon involves multiple steps and instruments. These include injecting saline solution to elevate the lesion, marking points with a needle knife or triangular knife, cutting along the marked edges with a hook knife or needle knife, dissecting the tissue with an IT knife (with a ceramic tip), and cauterizing bleeding points to stop bleeding. The surgeon will change instruments as needed during the procedure. Frequent instrument changes are tedious and time-consuming, which is detrimental to the patient's recovery. Furthermore, during mucosal dissection, the electrocautery knife requires selecting different blade lengths depending on the location, thickness, and elevation of the tissue being dissected, as well as the surgeon's preferred technique.

[0004] Patent document CN108523986A discloses a high-frequency endoscopic knife with an injection needle, comprising a vertical injection connector, a double-finger ring, a handle, a connector, a slider, an outer sheath, a hollow tube, a needle tube, an axial electrode, an insulating head, a radial electrode, a spring hose, and a steel cable. The spring hose and outer sheath are both fixedly connected to the handle. The needle tube and axial electrode are both housed within the spring hose. The vertical injection connector is slidably mounted on the handle. The connector is mounted on the double-finger ring. The slider is housed within the handle, with the connector and slider having an interference fit. The double-finger ring is slidably mounted on the handle. The hollow tube is inserted into the slider. The needle tube passes through the hollow tube and connects to the vertical injection connector to form a liquid channel. The distal end of the hollow tube is fixed to one end of the steel cable, and the other end of the steel cable is fixed to the axial electrode via an axial electrode connector. This device integrates the functions of an IT knife and an injection needle, reducing instrument change time and effort, and is more efficient and safer. However, the overall blade extension length is not adjustable.

[0005] Patent document CN111658128A discloses a multifunctional high-frequency cutting tool, including a head assembly and a handle assembly. The rear end of an outer sheath on the head assembly is connected to a first handle, and a spring tube passes through the outer sheath. An injection tube passes through the spring tube and is fixedly connected to a second handle. The second handle moves back and forth, causing the injection tube to move back and forth as well. A conductive seat passes through the front of the outer sheath, and the front end of the spring tube is fixedly connected to the conductive seat. The rear end of the spring tube is connected to a connector on an electrode base. An O-blade, with an inner cavity, also passes through the front of the outer sheath and communicates with the injection tube. The injection tube moves back and forth, causing the O-blade to extend and retract from the front end of the outer sheath. This high-frequency cutting tool integrates cutting, marking, electrocoagulation, and liquid spraying functions into one, allowing doctors to perform corresponding operations as needed, saving time on instrument changes and improving surgical efficiency. However, the overall blade extension length is not adjustable.

[0006] Patent document CN219147890U discloses a multifunctional high-frequency surgical instrument for endoscopy, including a handle and a double-finger ring handle that slides with it. The upper end of the inner catheter of the handle can be electrically connected or pass through to the electrode and water injection connector at the lower end of the handle. The lower end of the handle is connected to an elastic tube assembly through a connecting component. The lower part of the tube assembly slides with a flushing connector that is fixed to the bottom of the outer sheath. The lower end of the tube assembly passes through the flushing connector and the outer sheath and is connected to a type I blade. The type I blade is fitted with an O-type blade. The upper end of the O-type blade is connected to the tube assembly and has a radial electrode and an insulating head at the bottom. The inner cavity and circuit of the catheter, tube assembly, and type I blade can realize injection and I-blade marking, cutting, or electrocoagulation functions, respectively. The circuit of the electrode, catheter, tube assembly, O-type blade, and radial electrode can realize O-blade cutting or electrocoagulation functions. The water injection channel between the flushing connector, the central hole of the outer sheath, and the tube assembly can realize the flushing function, reducing the frequency of instrument replacement. However, the overall blade extension length is not adjustable. Summary of the Invention

[0007] To address the technical problem that existing electrosurgical units can only provide electrosurgical heads of fixed length, the purpose of this disclosure is to provide a multi-functional electrosurgical unit with adjustable length for water injection, so as to meet the doctor's needs for different electrosurgical head lengths during surgery and to provide multiple functions in one electrosurgical unit.

[0008] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0009] An adjustable-length water-filled multifunctional electrosurgical unit includes an I-blade body, a ceramic head, a radial electrode, an O-blade body, an outer sheath, an inner sheath, a connecting tube, a delivery tube, an outer sheath handle, an inner sheath handle, and a main handle. The distal end of the delivery tube is fixedly connected to the I-blade body via the connecting tube, and the proximal end of the delivery tube is fixed to the main handle. The O-blade body is fitted over the I-blade body. The distal end of the O-blade body is fixedly fitted with the ceramic head and the radial electrode and is limited by the distal end of the I-blade body. The proximal end of the O-blade body is fixedly connected to the distal end of the inner sheath. The inner sheath is fitted over the delivery tube, and the proximal end of the inner sheath is fixedly connected to the inner sheath handle. The outer sheath is fitted over the inner sheath, and the distal end of the outer sheath is limited by the ceramic head. The proximal end of the outer sheath is fixedly connected to the outer sheath handle. The relative positions of the outer sheath handle and the main handle can be moved to change, thereby adjusting the overall blade extension length. The relative positions of the inner sheath handle and the outer sheath handle can be moved to change, thereby enabling the conversion between the O-blade and the I-blade.

[0010] Preferably, the I-blade body has a hollow structure, with the central hole of the I-blade body connected to the tube hole of the delivery tube, and the delivery tube connected to the Luer connector on the main handle, thereby enabling injection.

[0011] Preferably, the outer sheath handle and the main handle are connected by threaded fit, interference fit, or concave-convex stop fit to achieve a connection that can both adjust the relative position and fix the relative position.

[0012] Preferably, the inner sheath handle is provided with a limiting buckle. The limiting buckle is used to restrict the relative movement between the inner sheath handle and the outer sheath handle by interference fit with the outer sheath handle or by clamping the limiting buckle on the outer sheath handle, thereby maintaining the working state of O-blade extension or I-blade extension.

[0013] Preferably, the main handle is provided with an electrode, which is fixedly connected to the proximal end of the delivery tube. The delivery tube is made of conductive material, so that the blade body can be energized.

[0014] Preferably, the main handle has a scale marking indicating the length of the blade extension at the connection point with the outer sheath handle.

[0015] Preferably, the ceramic head and the O-blade body are fixedly connected by a radial electrode.

[0016] Preferably, the proximal end of the O-blade body is fixedly connected to the distal end of the inner sheath via a ceramic pad.

[0017] Preferably, the outer sheath handle is sleeved over the inner sheath handle, and the outer sheath handle has an opening to expose the inner sheath handle. The limiting buckle is a flat clip structure, which clamps the outer sheath handle and the inner sheath handle to fix them in place.

[0018] An electrosurgical knife includes: an I-blade body; an O-blade body sleeved outside the I-blade body; an outer sheath handle; an outer sheath tube, the proximal end of which is fixedly connected to the outer sheath handle; and a main handle; wherein the relative positions of the outer sheath handle and the main handle are movable and changeable, thereby adjusting the overall blade extension length.

[0019] Preferably, the electrosurgical unit further includes: a connecting tube; and a delivery tube, wherein the distal end of the delivery tube is fixedly connected to the I-blade body via the connecting tube, and the proximal end of the delivery tube is fixed to the main handle.

[0020] Preferably, the electrosurgical unit further includes: an inner sheath sleeved outside the delivery tube, wherein the proximal end of the O-blade body is fixedly connected to the distal end of the inner sheath sleeve, and an outer sheath sleeved outside the inner sheath sleeve; and an inner sheath handle, wherein the proximal end of the inner sheath sleeve is fixedly connected to the inner sheath handle.

[0021] Preferably, the relative positions of the inner sheath handle and the outer sheath handle can be moved and changed, thereby enabling the conversion between the O-blade body and the I-blade body.

[0022] Preferably, the electrosurgical unit further includes a ceramic head and a radial electrode, fixedly disposed at the distal end of the O-blade body, wherein the distal end of the O-blade body is limited by the distal end of the I-blade body, and the distal end of the outer sheath is limited by the ceramic head.

[0023] Preferably, the outer sheath handle and the main handle are connected by threaded fit, interference fit, or concave-convex stop fit to achieve a connection that can both adjust the relative position and fix the relative position.

[0024] Preferably, the main handle has a scale marking indicating the length of the blade extension at the connection point with the outer sheath handle.

[0025] Preferably, the inner sheath handle is provided with a limiting buckle. The limiting buckle is used to interfere with the outer sheath handle or to clamp the outer sheath handle to restrict the relative movement between the inner sheath handle and the outer sheath handle, thereby maintaining the working state of the O-blade body extending or the I-blade body extending.

[0026] Preferably, the outer sheath handle is fitted over the inner sheath handle, and the outer sheath handle has an opening to expose the inner sheath handle.

[0027] Preferably, the limiting buckle is a flat clip structure that clamps onto the outer sheath handle and the inner sheath handle to fix them in place.

[0028] Preferably, the I-blade body has a hollow structure, the central hole of the I-blade body is connected to the tube hole of the delivery tube, and the delivery tube is connected to the Luer connector on the main handle, thereby enabling injection.

[0029] Preferably, the main handle is provided with an electrode, which is fixedly connected to the proximal end of the delivery tube. The delivery tube is made of a conductive material, thereby enabling the I-blade body to be energized.

[0030] Preferably, the ceramic head and the O-blade body are fixedly connected via the radial electrode.

[0031] Preferably, the proximal end of the O-blade body is fixedly connected to the distal end of the inner sheath via a ceramic pad.

[0032] An electrosurgical unit includes: an I-blade body; an O-blade body sleeved outside the I-blade body; an inner sheath tube, with the proximal end of the O-blade body fixedly connected to the distal end of the inner sheath tube; an inner sheath handle, with the proximal end of the inner sheath tube fixedly connected to the inner sheath handle; an outer sheath tube sleeved outside the inner sheath tube; and an outer sheath handle, with the proximal end of the outer sheath tube fixedly connected to the outer sheath handle. The O-blade body and the I-blade body can be switched by changing the relative positions of the inner and outer sheath handles.

[0033] Preferably, the electrosurgical unit further includes: a connecting tube; a delivery tube, the distal end of which is fixedly connected to the blade body via the connecting tube, the inner sheath sleeve being fitted over the delivery tube; and a main handle, the proximal end of which is fixed to the main handle, wherein the relative position of the outer sheath handle and the main handle can be moved and changed to adjust the extension length of the overall blade tip.

[0034] Preferably, the electrosurgical unit further includes a ceramic head and a radial electrode, fixedly disposed at the distal end of the O-blade body, wherein the distal end of the O-blade body is limited by the distal end of the I-blade body, and the distal end of the outer sheath is limited by the ceramic head.

[0035] Preferably, the inner sheath handle is provided with a limiting buckle. The limiting buckle is used to interfere with the outer sheath handle or to clamp the outer sheath handle to restrict the relative movement between the inner sheath handle and the outer sheath handle, thereby maintaining the working state of the O-blade body extending or the I-blade body extending.

[0036] Preferably, the outer sheath handle is fitted over the inner sheath handle, and the outer sheath handle has an opening to expose the inner sheath handle.

[0037] Preferably, the limiting buckle is a flat clip structure that clamps onto the outer sheath handle and the inner sheath handle to fix them in place.

[0038] Preferably, the I-blade body has a hollow structure, the central hole of the I-blade body is connected to the tube hole of the delivery tube, and the delivery tube is connected to the Luer connector on the main handle, thereby enabling injection.

[0039] Preferably, the main handle is provided with an electrode, which is fixedly connected to the proximal end of the delivery tube. The delivery tube is made of a conductive material, thereby enabling the I-blade body to be energized.

[0040] Preferably, the ceramic head and the O-blade body are fixedly connected via the radial electrode.

[0041] Preferably, the proximal end of the O-blade body is fixedly connected to the distal end of the inner sheath via a ceramic pad.

[0042] Preferably, the outer sheath handle and the main handle are connected by threaded fit, interference fit, or concave-convex stop fit to achieve a connection that can both adjust the relative position and fix the relative position.

[0043] Preferably, the main handle has a scale marking indicating the length of the blade extension at the connection point with the outer sheath handle.

[0044] This disclosure, employing the above-mentioned technical solution, comprises an insertion unit for intervention within the patient's body, consisting of an I-blade body, an O-blade body, an outer sheath, an inner sheath, a connecting tube, and a delivery tube. When energized, this insertion unit is controlled by a handle to perform functions such as injection, marking, and electrocautery. The handle unit, composed of an outer sheath handle, an inner sheath handle, and a main handle, allows adjustment of the overall blade extension length of both the I-blade and O-blade bodies by adjusting the position between the outer sheath handle and the main handle, thus adjusting the relative movement between the outer sheath and the blade head. Similarly, adjusting the relative position between the inner and outer sheath handles allows for relative movement between the O-blade and I-blade bodies, enabling adjustment of either the extension of the I-blade or the O-blade. A limiting latch restricts the movement of the inner sheath handle, ensuring that the I-blade does not extend when the O-blade extends, or vice versa. Therefore, this electrosurgical unit not only offers an adjustable overall blade extension length to meet the surgeon's needs for different blade lengths during surgery, but also provides multiple functions with a single unit, reducing instrument change time and effort and improving surgical efficiency. Attached Figure Description

[0045] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0046] Figure 1 is a schematic diagram of the structure of this disclosure (sectional view, enlarged distal portion).

[0047] Figure 2 is a schematic diagram of the structure of this disclosure (enlarged handle portion).

[0048] Figure 3 is a perspective view of this disclosure.

[0049] Figure 4 is a schematic diagram showing the blade of this disclosure extending 3mm.

[0050] Figure 5 is a schematic diagram showing the O-blade of this disclosure extending 3mm.

[0051] Figure 6 is a cross-sectional view of the O-blade protruding from this disclosure.

[0052] The components are as follows: 1. I-blade body; 2. Ceramic head; 3. Radial electrode; 4. O-blade body; 5. Outer sheath; 6. Ceramic pad; 7. Inner sheath; 8. Connecting tube; 9. Delivery tube; 10. Outer sheath handle; 11. Inner sheath handle; 12. Limiting buckle; 13. Main handle; 14. Electrode; 15. Luer connector. Detailed Implementation

[0053] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0054] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0055] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0056] In the description of this disclosure, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0057] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, unless otherwise stated, "a plurality of" means two or more, unless expressly defined otherwise.

[0059] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0060] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0061] Example 1

[0062] As shown in Figures 1 to 3, a multi-functional electrosurgical unit with adjustable length and water injection capability includes an I-blade body 1, a ceramic head 2, a radial electrode 3, an O-blade body 4, an outer sheath tube 5, an inner sheath tube 7, a connecting tube 8, a delivery tube 9, an outer sheath handle 10, an inner sheath handle 11, and a main handle 13. The distal end of the delivery tube 9 is fixedly connected to the I-blade body 1 via the connecting tube 8, and the proximal end of the delivery tube 9 is fixed to the main handle 13. The O-blade body 4 is sleeved outside the I-blade body 1, and the ceramic head 2 and the radial electrode 3 are fixedly mounted on the distal end of the O-blade body 4 and are limited by the distal end of the I-blade body 1. In position, the proximal end of the O-blade body 4 is fixedly connected to the distal end of the inner sheath tube 7, which is sleeved outside the delivery tube 9. The proximal end of the inner sheath tube 7 is fixedly connected to the inner sheath handle 11. The outer sheath tube 5 is sleeved outside the inner sheath tube 7, and the distal end of the outer sheath tube 5 is limited by the ceramic head 2. The proximal end of the outer sheath tube 5 is fixedly connected to the outer sheath handle 10. The relative position of the outer sheath handle 10 and the main handle 13 can be moved and changed to adjust the overall blade extension length. The relative position of the inner sheath handle 11 and the outer sheath handle 10 can be moved and changed to realize the conversion between O-blade and I-blade.

[0063] Thus, the insertion unit, consisting of the I-blade body, O-blade body, outer sheath, inner sheath, connecting tube, and delivery tube, is inserted into the patient's body. When energized, this insertion unit is controlled by the handle to perform functions such as injection, marking, and electrocautery. The handle unit, composed of the outer sheath handle, inner sheath handle, and main handle, allows adjustment of the overall blade extension length of both the I-blade and O-blade bodies by adjusting the position between the outer sheath handle and the main handle, thus adjusting the relative movement between the outer sheath and the blade head. Similarly, adjusting the relative position between the inner and outer sheath handles allows adjustment of the relative movement between the O-blade and I-blade bodies, enabling the extension of either the I-blade or O-blade body. A limiting latch restricts the movement of the inner sheath handle, ensuring that the I-blade does not extend when the O-blade is extended, or vice versa. Therefore, this electrosurgical unit not only offers adjustable overall blade extension length to meet the surgeon's needs for different blade lengths during surgery, but also provides multiple functions with a single unit, reducing instrument change time and effort and improving surgical efficiency.

[0064] In this preferred embodiment, as shown in Figure 1, the blade body 1 is a hollow structure. The central hole of the blade body 1 is connected to the pipe hole of the delivery pipe 9. The delivery pipe 9 is connected to the Luer connector 15 on the main handle 13, thereby enabling water injection.

[0065] In this preferred embodiment, the outer sheath handle 10 and the main body handle 13 are connected by a threaded fit, an interference fit, or a concave-convex stop fit, so that the two can be moved to adjust their position and can also be fixed.

[0066] In this preferred embodiment, as shown in Figures 4 to 6, the inner sheath handle 11 moves back and forth within the outer sheath handle 10, driving the O-blade body 4 to move back and forth, thus forming two working states: O-blade extended (Figure 4) and I-blade extended (Figures 5 and 6). The inner sheath handle 11 is provided with a limiting buckle 12. The limiting buckle 12, through an interference fit with the outer sheath handle 10 or by clamping it onto the outer sheath handle 10, restricts the relative movement between the inner and outer sheath handles 11, thereby maintaining either the O-blade extended (Figure 4) or I-blade extended (Figures 5 and 6) working state.

[0067] In this preferred embodiment, the main handle 13 is provided with an electrode 14, which is fixedly connected to the proximal end of the delivery tube 9. The delivery tube 9 is made of conductive material, so that the blade body 1 can be energized.

[0068] In this preferred embodiment, as shown in Figure 2, the main handle 13 has a scale marking indicating the blade extension length at the connection point with the outer sheath handle 10. This allows the blade extension length to be displayed, facilitating operation.

[0069] In this preferred embodiment, the ceramic head 2 and the O-blade body 4 are fixedly connected by a radial electrode 3.

[0070] In this preferred embodiment, the proximal end of the O-blade body 4 is fixedly connected to the distal end of the inner sheath tube 7 via a ceramic pad 6.

[0071] In this preferred embodiment, as shown in Figure 3, the outer sheath handle 10 is sleeved on the outside of the inner sheath handle 11, and the outer sheath handle 10 has an opening to expose the inner sheath handle 11. The limiting buckle 12 is a flat clip structure, which clamps the outer sheath handle 10 and the inner sheath handle 11 to fix them together.

[0072] In the description of this specification, the references to terms such as "an embodiment," "some embodiments," "one implementation," "specific implementation," "other implementation," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment, implementation, or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described above may be combined in any suitable manner in one or more embodiments, implementations, or examples. The technical solutions described in this disclosure also include technical solutions formed by any one or more specific features, structures, materials, or characteristics described above, either individually or in combination.

[0073] Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions, variations, deletions of some features, additions of features, or recombinations of features to the above embodiments within the scope of the present disclosure without departing from the principles and spirit of the present disclosure. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the innovative principles of the present disclosure shall still fall within the scope of the technical solutions of the present disclosure.

[0074] This disclosure also includes, but is not limited to, the following technical solutions.

[0075] Technical Solution 1. A multi-functional electrosurgical knife with adjustable length and water injection function, characterized in that it comprises an I-knife body (1), a ceramic head (2), a radial electrode (3), an O-knife body (4), an outer sheath tube (5), an inner sheath tube (7), a connecting tube (8), a delivery tube (9), an outer sheath handle (10), an inner sheath handle (11), and a main handle (13). The distal end of the delivery tube (9) is fixedly connected to the I-knife body (1) through the connecting tube (8), and the proximal end of the delivery tube (9) is fixed on the main handle (13). The O-knife body (4) is sleeved outside the I-knife body (1), and the ceramic head (2) and the radial electrode (3) are fixedly disposed at the distal end of the O-knife body (4) and are controlled by the I-knife body. The distal end of the body (1) is limited, the proximal end of the O-blade body (4) is fixedly connected to the distal end of the inner sheath tube (7), the inner sheath tube (7) is sleeved outside the delivery tube (9), the proximal end of the inner sheath tube (7) is fixedly connected to the inner sheath handle (11), the outer sheath tube (5) is sleeved outside the inner sheath tube (7), the distal end of the outer sheath tube (5) is limited by the ceramic head (2), the proximal end of the outer sheath tube (5) is fixedly connected to the outer sheath handle (10), the relative position of the outer sheath handle (10) and the main body handle (13) can be moved and changed so as to adjust the overall blade extension length, the relative position of the inner sheath handle (11) and the outer sheath handle (10) can be moved and changed so as to realize the conversion between O-blade and I-blade.

[0076] Technical Solution 2. According to Technical Solution 1, a length-adjustable water-injection multifunctional electrosurgical knife is characterized in that the I-blade body (1) is a hollow structure, the central hole of the I-blade body (1) is connected to the pipe hole of the delivery pipe (9), and the delivery pipe (9) is connected to the Luer connector (15) on the main handle (13), so that injection can be performed.

[0077] Technical Solution 3. A length-adjustable water-filling multifunctional electric knife according to Technical Solution 1, characterized in that the outer sheath handle (10) and the main handle (13) are connected by threaded fit, interference fit or concave-convex stop fit to achieve a connection that can both adjust the relative position and fix the relative position.

[0078] Technical Solution 4. A water-injection multi-functional electric knife with adjustable length according to Technical Solution 1, characterized in that a limiting buckle (12) is provided on the inner sheath handle (11), and the relative movement between the inner sheath handle (11) and the outer sheath handle (10) is restricted by the limiting buckle (12) being interference-fitted with the outer sheath handle (10) or by the limiting buckle (12) being clamped on the outer sheath handle (10), thereby maintaining the working state of O-blade extension or I-blade extension.

[0079] Technical Solution 5. A water-injection multi-functional electric knife with adjustable length according to Technical Solution 1, characterized in that an electrode (14) is provided on the main handle (13), the electrode (14) is fixedly connected to the proximal end of the delivery tube (9), and the delivery tube (9) is made of conductive material, so that the knife body (1) can be energized.

[0080] Technical Solution 6. A water-injection multi-functional electric knife with adjustable length according to Technical Solution 1, characterized in that the main handle (13) is provided with a scale marking indicating the extension length of the knife body at the connection between the main handle (13) and the outer sheath handle (10).

[0081] Technical Solution 7. A multi-functional electrosurgical knife with adjustable length for water injection as described in Technical Solution 1, characterized in that the ceramic head (2) and the O-knife body (4) are fixedly connected by a radial electrode (3).

[0082] Technical Solution 8. A water-injection multifunctional electrosurgical unit with adjustable length according to Technical Solution 1, characterized in that the proximal end of the O-blade body (4) is fixedly connected to the distal end of the inner sheath tube (7) through a ceramic pad (6).

[0083] Technical Solution 9. A water-injection multi-functional electric knife with adjustable length according to Technical Solution 1, characterized in that the outer sheath handle (10) is sleeved outside the inner sheath handle (11), the outer sheath handle (10) has an opening to expose the inner sheath handle (11), and the limiting buckle (12) is a flat clip structure, which clamps the outer sheath handle (10) and the inner sheath handle (11) to fix the two.

Claims

1. An electrosurgical unit, comprising: I. Blade body (1); The O-blade body (4) is sleeved on the outside of the I-blade body (1); Outer sheath handle (10); An outer sheath (5), the proximal end of which is fixedly connected to the outer sheath handle (10); and Main body handle(13); The relative positions of the outer sheath handle (10) and the main body handle (13) can be moved and changed, thereby adjusting the overall blade extension length.

2. The electrosurgical unit according to claim 1 further comprises: Connecting pipe (8); as well as The delivery tube (9) is fixedly connected to the blade body (1) of the I-blade via the connecting tube (8), and the proximal end of the delivery tube (9) is fixed to the main handle (13).

3. The electrosurgical unit according to claim 2 further includes: An inner sheath (7) is fitted over the delivery tube (9), wherein the proximal end of the O-blade body (4) is fixedly connected to the distal end of the inner sheath (7), and an outer sheath (5) is fitted over the inner sheath (7); and The inner sheath handle (11) is fixedly connected to the proximal end of the inner sheath tube (7). The relative positions of the inner sheath handle (11) and the outer sheath handle (10) can be moved and changed, thereby enabling the conversion between the O-blade body (4) and the I-blade body (1).

4. The electrosurgical unit according to any one of claims 1 to 3, further comprising: The ceramic head (2) and radial electrode (3) are fixedly disposed at the distal end of the O-blade body (4). The distal end of the O-blade body (4) is limited by the distal end of the I-blade body (1), and the distal end of the outer sheath (5) is limited by the ceramic head (2).

5. The electrosurgical unit according to any one of claims 1 to 4, wherein, The outer sheath handle (10) and the main handle (13) are connected by threaded fit, interference fit, or concave-convex stop fit to achieve a connection that can both adjust the relative position and fix the relative position.

6. The electrosurgical unit according to any one of claims 1 to 5, wherein, The main handle (13) has a scale marking indicating the length of the blade extension at the connection point with the outer sheath handle (10).

7. The electrosurgical unit according to any one of claims 3 to 6, wherein, The inner sheath handle (11) is provided with a limiting buckle (12). The limiting buckle (12) is interference-fitted with the outer sheath handle (10) or clamped on the outer sheath handle (10) to restrict the relative movement between the inner sheath handle (11) and the outer sheath handle (10), thereby maintaining the working state of the O-blade body (4) or the I-blade body (1) extended.

8. The electrosurgical unit according to any one of claims 3 to 7, wherein, The outer sheath handle (10) is fitted over the inner sheath handle (11), and the outer sheath handle (10) has an opening to expose the inner sheath handle (11).

9. The electrosurgical unit according to claim 7 or 8, wherein, The limiting buckle (12) is a flat clip structure that clamps onto the outer sheath handle (10) and the inner sheath handle (11) to fix them in place.

10. The electrosurgical unit according to any one of claims 2 to 9, wherein, The I-blade body (1) has a hollow structure. The central hole of the I-blade body (1) is connected to the hole of the delivery tube (9). The delivery tube (9) is connected to the Luer connector (15) on the main handle (13), thereby enabling injection.

11. The electrosurgical unit according to any one of claims 2 to 10, wherein, The main handle (13) is provided with an electrode (14), which is fixedly connected to the proximal end of the delivery tube (9). The delivery tube (9) is made of conductive material, so that the I-blade body (1) can be energized.

12. The electrosurgical unit according to any one of claims 4 to 11, wherein, The ceramic head (2) and the O-blade body (4) are fixedly connected by the radial electrode (3).

13. The electrosurgical unit according to any one of claims 3 to 12, wherein, The proximal end of the O-blade body (4) is fixedly connected to the distal end of the inner sheath tube (7) via a ceramic pad (6).

14. An electrosurgical unit, comprising: I. Blade body (1); The O-blade body (4) is sleeved on the outside of the I-blade body (1); The proximal end of the O-knife body (4) is fixedly connected to the distal end of the inner sheath (7); Inner sheath handle (11), the proximal end of the inner sheath tube (7) is fixedly connected to the inner sheath handle (11); The outer sheath (5) is fitted over the inner sheath (7); and The outer sheath handle (10) is fixedly connected to the proximal end of the outer sheath tube (5). The O-blade body (4) and the I-blade body (1) can be switched by changing the relative positions of the inner sheath handle (11) and the outer sheath handle (10).

15. The electrosurgical unit according to claim 14, further comprising: Connecting pipe (8); A delivery pipe (9), the distal end of which is fixedly connected to the blade body (1) via a connecting pipe (8), and an inner sheath (7) sleeved outside the delivery pipe (9); and The main handle (13) is fixed to the proximal end of the delivery tube (9). The relative positions of the outer sheath handle (10) and the main body handle (13) can be moved and changed, thereby adjusting the extension length of the overall blade.

16. The electrosurgical unit according to claim 14 or 15, further comprising: The ceramic head (2) and radial electrode (3) are fixedly disposed at the distal end of the O-blade body (4). The distal end of the O-blade body (4) is limited by the distal end of the I-blade body (1), and the distal end of the outer sheath (5) is limited by the ceramic head (2).

17. The electrosurgical unit according to any one of claims 14 to 16, wherein, The inner sheath handle (11) is provided with a limiting buckle (12). The limiting buckle (12) is interference-fitted with the outer sheath handle (10) or clamped on the outer sheath handle (10) to restrict the relative movement between the inner sheath handle (11) and the outer sheath handle (10), thereby maintaining the working state of the O-blade body (4) or the I-blade body (1) extended.

18. The electrosurgical unit according to any one of claims 14 to 17, wherein, The outer sheath handle (10) is fitted over the inner sheath handle (11), and the outer sheath handle (10) has an opening to expose the inner sheath handle (11).

19. The electrosurgical unit according to claim 17 or 18, wherein, The limiting buckle (12) is a flat clip structure that clamps onto the outer sheath handle (10) and the inner sheath handle (11) to fix them in place.

20. The electrosurgical unit according to any one of claims 15 to 19, wherein, The I-blade body (1) has a hollow structure. The central hole of the I-blade body (1) is connected to the hole of the delivery tube (9). The delivery tube (9) is connected to the Luer connector (15) on the main handle (13), thereby enabling injection.

21. The electrosurgical unit according to any one of claims 15 to 20, wherein, The main handle (13) is provided with an electrode (14), which is fixedly connected to the proximal end of the delivery tube (9). The delivery tube (9) is made of conductive material, so that the I-blade body (1) can be energized.

22. The electrosurgical unit according to any one of claims 16 to 21, wherein, The ceramic head (2) and the O-blade body (4) are fixedly connected by the radial electrode (3).

23. The electrosurgical unit according to any one of claims 14 to 22, wherein, The proximal end of the O-blade body (4) is fixedly connected to the distal end of the inner sheath tube (7) via a ceramic pad (6).

24. The electrosurgical unit according to any one of claims 15 to 23, wherein, The outer sheath handle (10) and the main handle (13) are connected by threaded fit, interference fit, or concave-convex stop fit to achieve a connection that can both adjust the relative position and fix the relative position.

25. The electrosurgical unit according to any one of claims 15 to 24, wherein, The main handle (13) has a scale marking indicating the length of the blade extension at the connection point with the outer sheath handle (10).

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