A minimally invasive cutter and system for an endoscope with a replaceable cold and heat therapy state

Abstract

The present invention discloses a minimally invasive cutter for an endoscope with changeable hot and cold therapy states and a system, which relates to the technical field of medical devices and can solve the problem of easy over-injury caused by single thermal energy treatment. This embodiment discloses a minimally invasive cutter for an endoscope with changeable hot and cold therapy states, including a sheath tube assembly and a cutting module; the sheath tube assembly includes a conductive tube arranged inside an outer sheath tube; the cutting module includes a cutter tube structure and a high-pressure nozzle fixed inside the cutter tube structure; the cutter tube structure is electrically and hermetically fixedly connected to the end of the conductive tube, and the air inlet end of the high-pressure nozzle is communicated with the internal channel of the conductive tube.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a minimally invasive cutter and system for an endoscope with interchangeable cold and heat therapy states. Background Art

[0002] Endoscopic minimally invasive instruments have been widely used in modern medicine, providing treatment options with less trauma and faster recovery for patients. Currently, the main endoscopic surgical procedures include EMR, EMRC, EMRL, ESD, POEM, or ultrasound therapy, etc. Most of these surgical instruments use a single energy source as the treatment power source, and among them, the thermal energy technology of high-frequency electrosurgery is particularly widely used. These thermal energy technologies achieve tissue cutting and blood vessel sealing by generating high temperatures, thereby achieving the effect of hemostasis.

[0003] However, there are the following disadvantages or deficiencies in clinical use:

[0004] First, the surgical thermal energy technology will generate a relatively high temperature during the cutting and hemostasis processes, which is likely to cause thermal damage to the surrounding normal tissues. This thermal damage may lead to tissue carbonization, adhesion, and inflammatory reactions, affecting the surgical effect and the patient's postoperative recovery. Moreover, the smoke and eschar generated during the thermal energy cutting process will obscure the surgical field of view, affecting the doctor's observation and operation of the target tissue. This not only increases the difficulty and time of the surgery but also may lead to incomplete surgery. Second, the electrothermal energy has a high efficiency in cutting tissues, but the gastrointestinal tissue layer is relatively thin, and improper operation is extremely likely to cause perforation. Third, the electro-surgery uses thermal energy to cut tissues, and during the operation process, the electrode and the tissue will adhere to each other, affecting the subsequent use of the instrument. Fourth, currently, most instruments are manually pre-set parameters on the host device, and during the operation process, the output is controlled or interrupted by stepping on the pedal; if different tissues are cut or the specific surgical procedures are different, auxiliary personnel are required to adjust the host parameters; Fifth, the front end of the existing incision knife only has a working electrode, and lacks the monitoring of the final effect. For example, for the thermal energy of the existing electrothermal energy, the output situation can only be judged based on the operator's experience.

[0005] Based on the above background, the inventor has designed a minimally invasive cutter and system for an endoscope with interchangeable cold and heat therapy states to solve at least one of the above problems, and thus, this application is proposed. Summary of the Invention

[0006] The purpose of this application is to provide a minimally invasive cutter and system for an endoscope with interchangeable cold and heat therapy states, which solves the problems that the incision knife using a single thermal energy in the prior art is prone to cause excessive damage during the treatment process, affects the surgical process, and is not easy to recover after the operation.

[0007] To solve the above technical problems, the present invention adopts the following solutions:

[0008] On the one hand, the present application provides a minimally invasive cutting knife for an endoscope with a replaceable cold and heat therapy state, including a sheath tube assembly and a cutting module;

[0009] The sheath tube assembly includes a conductive tube disposed inside an outer sheath tube;

[0010] The cutting module includes a knife tube structure and a high-pressure nozzle fixed inside the knife tube structure;

[0011] The knife tube structure is electrically conductive and hermetically fixedly connected to the end of the conductive tube, and the air inlet end of the high-pressure nozzle is communicated with the internal channel of the conductive tube.

[0012] Optionally, the sheath tube assembly further includes an outer sheath tube, and a first exhaust sandwich layer is provided between the outer sheath tube and the conductive tube;

[0013] The cutting module further includes a knife sleeve structure fixed inside the first exhaust sandwich layer;

[0014] The end of the knife tube structure is provided with a sealed pressure relief cavity for quickly relieving pressure after the high-pressure gas in the high-pressure nozzle is ejected. The gas jet port of the high-pressure nozzle faces the sealed pressure relief cavity, and a second exhaust sandwich layer communicating with the sealed pressure relief cavity is provided between the high-pressure nozzle and the knife tube structure;

[0015] The knife tube structure is disposed inside the knife sleeve structure and is slidably and hermetically connected thereto. A third exhaust sandwich layer communicating with the first exhaust sandwich layer is provided between the knife tube structure and the knife sleeve structure, and a pressure relief port for communicating the second exhaust sandwich layer and the third exhaust sandwich layer is provided on the knife tube structure.

[0016] Optionally, the end of the knife tube structure away from the conductive tube is provided with a knife tube end head, and the cross-sectional dimension of the knife tube end head is larger than the cross-sectional dimension of the knife tube structure;

[0017] The cutting module further includes a knife tube end cover and a return spring. The knife tube end cover is buckled on the knife tube end head and is slidably connected thereto. A sealed pressure relief cavity is formed between the buckled knife tube end cover and the knife tube end head. The return spring is disposed inside the sealed pressure relief cavity, and its two ends are respectively fixed to the knife tube end cover and the knife tube end head;

[0018] A limit ring convex for preventing the knife tube end cover from slipping off and playing a sealing role is further provided on the outer peripheral wall of the knife tube end head.

[0019] Optionally, the inner peripheral wall of the knife sleeve structure is further provided with an installation ring groove, and an outer ring edge or / and an inner ring edge;

[0020] The outer ring edge is located on the side of the installation ring groove away from the conductive tube, and the inner ring edge is located on the side of the installation ring groove close to the conductive tube;

[0021] Both the outer ring edge and the inner ring edge are annularly disposed close to the outer peripheral wall of the knife tube structure;

[0022] The cutting module further includes a cutter tube seal ring installed in the mounting ring groove, and the cutter tube structure is slidably and sealingly connected to the cutter sleeve structure through the cutter tube seal ring.

[0023] Optionally, the cutter sleeve structure includes an integrally formed mounting section and an exposed section;

[0024] The cutter sleeve structure is fixed between the outer sheath tube and the conductive tube through the mounting section;

[0025] The outer ring cutting edge, the mounting ring groove, and the inner ring cutting edge are located within the exposed section.

[0026] Optionally, both an outer ring cutting edge and an inner ring cutting edge are provided inside the cutter sleeve structure;

[0027] The cutting edges of the outer ring cutting edge and the inner ring cutting edge are both inclined outward.

[0028] Optionally, it further includes a patch type temperature sensor. The monitoring end of the patch type temperature sensor is fixedly attached to the cutter tube structure, and its signal cable extends towards one end away from the cutting module through the first exhaust sandwich layer.

[0029] Optionally, it further includes a handle module and a push rod assembly for driving the conductive tube to reciprocate axially. The push rod assembly is arranged on the handle module. The push rod assembly includes a push rod structure, a limit slider, and a piston sealing rod;

[0030] The conductive tube is fixed to the piston sealing rod. The piston sealing rod is inserted into the limit slider, and both the limit slider and the piston sealing rod are fixedly connected to the push rod structure.

[0031] Optionally, a first switch for controlling the current circuit and a second switch for controlling the air flow circuit are further provided on the handle module.

[0032] Optionally, it further includes an air outlet pipe communicated with the third exhaust sandwich layer. The air outlet pipe is connected to one end of the sheath tube assembly away from the cutting module.

[0033] On the other hand, the present application provides a minimally invasive cutter system for an endoscope with interchangeable cold and heat therapy states, including a minimally invasive cutter for an endoscope with interchangeable cold and heat therapy states as described in any one of the above, and further including a controller and a gas source module. The gas source module includes a gas cylinder and an air flow control valve. The controller is communicatively connected to the signal input end of the air flow control valve;

[0034] The high-pressure air outlet pipe of the gas source module is communicated with the conductive tube through the air flow control valve.

[0035] Advantages of the present invention:

[0036] 1. This application can heat the cutter tube structure using a conductive tube to perform surgical operations such as thermal cutting, hemostasis, and marking. It can also eject high-pressure gas through a high-pressure nozzle inside the cutter tube structure and quickly release the pressure to achieve extremely rapid cooling of the cutter tube structure and the cutter tube end cap through the Joule-Thomson principle, so as to perform operations such as lifting and traction assistance on adherent tissues during the surgical operation.

[0037] 2. Since this application can achieve both thermal energy operations and cold energy operations, during the entire surgical operation, it is possible to inactivate diseased tissues by alternately using thermal energy and cold energy, reducing the scope of damage to other normal underlying tissues during the thermal energy treatment process, and effectively reducing unintended injuries during the surgical process, such as the phenomenon of gastrointestinal perforation that is extremely likely to occur when only using thermal energy.

[0038] 3. Since this application can be switched to cold energy operation, during the thermal energy operation, the adherent tissues attached to the cutter tube structure can be embrittled by cold energy, and then scraped and cleaned using the outer ring cutting edge and inner ring cutting edge provided on the cutter sleeve structure to avoid affecting the subsequent use of the instrument.

[0039] 4. This application realizes the technical effect that the volume of the component in contact with the human tissue can be changed during the cold and thermal energy operations by setting the cutter tube end, the return spring, and the cutter tube end cap. During the cold energy operation, both the cutter tube end and the cutter tube end cap are exposed, making the volume of the component in contact with the human body larger, making operations such as adhesion, lifting, and traction assistance more stable and more conducive to cold energy operation. During the thermal energy operation, the cutter tube end cap wraps the cutter tube end, making the volume of the component in contact with the human body smaller, avoiding the problem of excessive damage caused by too large a volume, and being more conducive to thermal energy operation.

[0040] 5. This application sets a first switch, a second switch, and a push rod assembly on the handle module, enabling the doctor to not only control the on-off of the current circuit, but also control whether the cutter tube structure extends out of the cutter sleeve structure, and can also control the air flow circuit, which can greatly improve the operation convenience of the surgeon. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a three-dimensional structural schematic diagram of Embodiment 1 of this application.

[0042] Figure 2 is a three-dimensional structural schematic diagram of Embodiment 1 of this application after removing half of the handle housing.

[0043] Figure 3 is a three-dimensional sectional structural schematic diagram of the cutting module of Embodiment 1 of this application.

[0044] Figure 4 is a sectional structural schematic diagram of Embodiment 1 of this application.

[0045] Figure 5 is Figure 4 The partial enlarged structural schematic diagram at position A in

[0046] Figure 6 is Figure 5 The partial enlarged structural schematic diagram at position A1 in

[0047] Figure 7 The three - dimensional structural schematic diagram of the cutter head assembly in Embodiment 1 of the present application.

[0048] Figure 8 The sectional structural schematic diagram of the cutter head assembly in Embodiment 1 of the present application.

[0049] Figure 9 The three - dimensional structural schematic diagram of the cutter sleeve structure in Embodiment 1 of the present application.

[0050] Figure 10 The sectional structural schematic diagram of the cutter sleeve structure in Embodiment 1 of the present application.

[0051] Figure 11 The three - dimensional structural schematic diagram of the push rod assembly in Embodiment 1 of the present application.

[0052] Figure 12 The schematic diagram of the air flow circuit in Embodiment 2 of the present application.

[0053] Explanation of reference numerals:

[0054] 1 - sheath tube assembly, 11 - outer sheath tube, 111 - identification ring, 12 - conductive tube, 13 - first exhaust interlayer, 2 - cutting module, 21 - cutter sleeve structure, 211 - mounting ring groove, 212 - outer ring cutting edge, 213 - inner ring cutting edge, 214 - exposed section, 215 - mounting section, 22 - high - pressure nozzle, 221 - gas passage, 222 - jet orifice, 23 - cutter tube structure, 231 - air release port, 232 - cutter tube end, 233 - limiting ring projection, 24 - cutter tube end cap, 25 - return spring, 26 - second exhaust interlayer, 27 - third exhaust interlayer, 28 - cutter tube sealing ring, 29 - sealed pressure - relief cavity, 3 - handle module, 301 - plunger accommodation groove, 31 - first button, 32 - second button, 4 - push rod assembly, 41 - push rod structure, 411 - push head sliding key, 412 - sliding key mounting ring, 42 - limiting slider, 421 - sealed moving cavity, 422 - limiting card slot, 43 - piston sealing rod, 44 - plunger body, 5 - air outlet pipe, 61 - contact elastic piece, 62 - wire pressing terminal, 7 - temperature sensor, 81 - gas tank, 82 - air flow control valve. Detailed implementation manners

[0055] The following combines embodiments and the accompanying drawings to further elaborate on the present invention in detail, but the implementation manners of the present invention are not limited thereto.

[0056] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0057] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "provided with", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0059] Embodiment 1:

[0060] As Figures 1 to 11 shown, this embodiment provides a minimally invasive cutting knife for an endoscope with a replaceable cold and heat therapy state, including a sheath tube assembly 1 and a cutting module 2, wherein:

[0061] The sheath tube assembly 1 includes an outer sheath tube 11 and a conductive tube 12 disposed inside the outer sheath tube 11. A first exhaust sandwich layer 13 is provided between the outer sheath tube 11 and the conductive tube 12;

[0062] The cutting module 2 includes a cutter tube structure 23, a high-pressure nozzle 22, and a cutter sleeve structure 21;

[0063] The end of the cutter tube structure 23 is provided with a sealed pressure relief cavity 29 for quickly relieving pressure after the high-pressure gas in the high-pressure nozzle 22 is ejected. The high-pressure nozzle 22 is fixed inside the cutter tube structure 23, and the gas jet port 222 of the high-pressure nozzle 22 is arranged facing the sealed pressure relief cavity 29. A second exhaust sandwich layer 26 communicating with the sealed pressure relief cavity 29 is provided between the high-pressure nozzle 22 and the cutter tube structure 23;

[0064] The cutter tube structure 23 is disposed inside the cutter sleeve structure 21 and is slidably and sealingly connected thereto. A third exhaust sandwich layer 27 communicating with the first exhaust sandwich layer 13 is provided between the cutter tube structure 23 and the cutter sleeve structure 21. A pressure relief port 231 for communicating the second exhaust sandwich layer 26 and the third exhaust sandwich layer 27 is provided on the cutter tube structure 23;

[0065] One end of the cutter tube structure 23 away from the sealed pressure relief cavity 29 is conductively and hermetically fixedly connected to the end of the conductive tube 12, and the air inlet end of the high-pressure nozzle 22 is communicated with the internal channel of the conductive tube 12;

[0066] The cutter sleeve structure 21 is fixed in the first exhaust sandwich layer 13 between the outer sheath tube 11 and the conductive tube 12.

[0067] In this embodiment, by providing the conductive tube 12, the cutter tube structure 23, the high-pressure nozzle 22, and the cutter sleeve structure 21, and the cutter tube structure 23 is conductively and hermetically fixedly connected to the conductive tube 12, and the high-pressure nozzle 22 is arranged in the cutter tube structure 23, and the jet orifice 222 of the high-pressure nozzle 22 faces the sealed pressure relief cavity, when this embodiment is in use:

[0068] If the conductive tube 12 is in an energized state and there is no high-pressure gas in the conductive tube 12, the cutter tube structure 23 can be quickly heated by electric energy and the temperature of the cutter tube structure 23 can be maintained at a high temperature state, enabling the doctor to perform thermal energy surgical treatment operations, such as cutting, marking, hemostasis and other surgical operations.

[0069] If the conductive tube 12 is in a de-energized state and high-pressure gas is filled in the conductive tube 12, the high-pressure gas can be ejected through the high-pressure nozzle 22 and quickly relieve pressure in the sealed pressure relief cavity, realizing the rapid cooling of the cutter tube structure 23 and maintaining the temperature of the cutter tube structure 23 at a low temperature state, enabling the doctor to perform cold energy treatment operations, such as lifting and traction assistance and other operations.

[0070] In an actual surgical scenario, since the instrument of this embodiment can realize both thermal energy treatment and cold energy treatment, during the surgical process by the surgeon, cold and thermal energy alternating surgical treatment operations can also be performed, realizing the inactivation treatment of the diseased tissue, reducing the scope of damage to other normal basic tissues during the thermal energy treatment process, and effectively reducing the unintended damage during the surgical process, such as the phenomenon of gastrointestinal perforation that is extremely likely to occur when only using thermal energy.

[0071] In this embodiment, as Figure 3 、 Figure 5 and Figure 6As shown, after the high-pressure gas in this embodiment enters the conductive tube 12, it first enters the high-pressure nozzle 22 through the air inlet end of the high-pressure nozzle 22, then is ejected through the jet orifice 222 of the high-pressure nozzle 22, and then enters the sealed pressure relief chamber 29. Since the size of the sealed pressure relief chamber 29 is much larger than that of the jet orifice 222, the gas pressure ejected from the jet orifice 222 will rapidly decrease. Based on the Joule-Thomson principle, the cutter tube structure 23 will rapidly decrease in temperature and maintain an ultra-low temperature state. At this time, the surgeon can perform cryogenic energy surgical treatment operations. The depressurized gas will first enter the second exhaust layer 26, and then enter the third exhaust layer 27 through the air vent 231 between the second exhaust layer 26 and the third exhaust layer 27. Since the third exhaust layer 27 is connected to the first exhaust layer 13, the gas will flow back from the first exhaust layer 13 and be discharged outside the instrument of this embodiment.

[0072] Specifically, in this embodiment, as Figure 3 、 Figure 5 and Figure 6 shown, a cutter tube end 232 is provided at one end of the cutter tube structure 23 away from the conductive tube 12, and the cross-sectional dimension of the cutter tube end 232 is larger than that of the cutter tube structure 23;

[0073] The cutting module 2 further includes a cutter tube end cap 24 and a return spring 25. The cutter tube end cap 24 is buckled on the cutter tube end 232 and is slidably connected thereto. A sealed pressure relief chamber 29 is formed between the buckled cutter tube end cap 24 and the cutter tube end 232. The return spring 25 is disposed in the sealed pressure relief chamber 29, and its two ends are respectively fixed to the cutter tube end cap 24 and the cutter tube end 232;

[0074] A limiting ring protrusion 233 for preventing the cutter tube end cap 24 from slipping off and playing a sealing role is further provided on the outer peripheral wall of the cutter tube end 232.

[0075] In this embodiment, by providing the cutter tube end cap 24 and the return spring 25, after the high-pressure gas is ejected from the jet orifice 222 of the high-pressure nozzle 22, it will impact the cutter tube end cap 24 to make it move away from the high-pressure nozzle 22 until the limiting ring protrusion 233 provided on the cutter tube end 232 restricts its further forward movement. At this time, the cutter tube end cap 24 maintains an extremely low temperature, and the doctor uses the cutter tube end cap 24 for operations such as lifting and traction assistance.

[0076] In this embodiment, during the cryogenic energy surgical operation, the cutter tube end cap 24 is impacted by the high-speed air flow and extends outwards, so that during the entire cryogenic energy surgical operation process, both the cutter tube end cap 24 and the cutter tube end 232 are exposed, increasing the volume of the components that can be frozen, which is beneficial to the surgeon's cryogenic energy surgical operation and can improve the surgical efficiency.

[0077] Meanwhile, in this embodiment, during the thermal energy surgical operation, the high-pressure nozzle 22 no longer ejects high-pressure air flow, and the knife tube end cap 24 is no longer impacted by the air flow. Under the action of the reset spring 25, the knife tube end cap 24 resets to wrap the knife tube end 232 therein. At this time, the volume of the high-temperature component in contact with the human tissue becomes smaller, avoiding the problem of excessive damage caused by too large a volume, and being more conducive to thermal energy operation.

[0078] Specifically, in this embodiment, an installation ring groove 211, an outer ring cutting edge 212 or / and an inner ring cutting edge 213 are further provided on the inner peripheral wall of the knife sleeve structure 21;

[0079] The outer ring cutting edge 212 is located on the side of the installation ring groove 211 away from the conductive tube 12, and the inner ring cutting edge 213 is located on the side of the installation ring groove 211 close to the conductive tube 12;

[0080] Both the outer ring cutting edge 212 and the inner ring cutting edge 213 are arranged in a ring shape close to the outer peripheral wall of the knife tube structure 23;

[0081] The cutting module 2 further includes a knife tube sealing ring 28 installed in the installation ring groove 211, and the knife tube structure 23 is slidably and sealingly connected to the knife sleeve structure 21 through the knife tube sealing ring 28.

[0082] In this embodiment, by providing the outer ring cutting edge 212 and the inner ring cutting edge 213, when switching to the cold energy operation, the sticky tissue attached to the knife tube structure 23 during the thermal energy operation can be embrittled by the cold energy, and then the outer ring cutting edge 212 and the inner ring cutting edge 213 provided on the knife sleeve structure 21 are used for scraping and cleaning, so as to avoid affecting the subsequent use of the instrument.

[0083] Specifically, in this embodiment, as Figure 9 and Figure 10 shown, the knife sleeve structure 21 includes an integrally formed installation section 215 and an exposed section 214;

[0084] The knife sleeve structure 21 is fixed between the outer sheath tube 11 and the conductive tube 12 through the installation section 215;

[0085] The outer ring cutting edge 212, the installation ring groove 211, and the inner ring cutting edge 213 are located in the exposed section 214.

[0086] The knife sleeve structure 21 in this embodiment is made of ceramic material, which has a good heat insulation effect. The outer ring cutting edge 212 and the inner ring cutting edge 213 are integrally formed with the knife sleeve structure 21. The knife sleeve structure 21 includes an exposed section 214, so that after the knife tube structure 23 retracts, the knife tube end 232 presses against the end face of the exposed section 214 of the knife sleeve structure 21, playing a role of limiting and heat insulation.

[0087] Specifically, in this embodiment, as Figure 6As shown, both an outer ring cutting edge 212 and an inner ring cutting edge 213 are provided inside the tool sleeve structure 21;

[0088] The cutting edges of the outer ring cutting edge 212 and the inner ring cutting edge 213 are both inclined outward, so that during the process of the tool tube structure 23 extending outward and retracting inward, both the inner ring cutting edge 213 and the outer ring cutting edge 212 will perform a scraping action, enabling two scraping actions to be achieved in one retracting and extending action, which can improve the cleaning effect of the tissue adhered to the tool sleeve structure 21.

[0089] In this embodiment, the outer ring cutting edge 212 and the inner ring cutting edge 213 are symmetrically arranged on both sides of the mounting ring groove 211, and the included angle between the outer ring cutting edge 212 and the inner ring cutting edge 213 and the inner peripheral wall of the tool sleeve structure 21 is 30°. Technicians can also set it to angles such as 45° and 60° according to requirements, and no further examples are given here.

[0090] Specifically, in this embodiment, as Figure 7 shown, it further includes a patch type temperature sensor 7. The monitoring end of the patch type temperature sensor 7 is fixedly attached to the tool tube structure 23, and its signal cable extends towards the end away from the cutting module 2 through the first exhaust interlayer 13. By setting the patch type temperature sensor 7, it can monitor the temperature of the tool tube structure 23 in real time, monitor the real-time temperature during the thermal energy operation and the cold energy operation, thereby improving the perception and controllability of the temperature of the cutting module 2.

[0091] Specifically, in this embodiment, as Figure 2 、 Figure 4 and Figure 11 shown, it further includes a handle module 3, and a push rod assembly 4 for driving the conductive tube 12 to reciprocate axially. The push rod assembly 4 is arranged on the handle module 3. The push rod assembly 4 includes a push rod structure 41, a limit slider 42, and a piston sealing rod 43;

[0092] The conductive tube 12 is fixed to the piston sealing rod 43. The piston sealing rod 43 is inserted into the limit slider 42, and both the limit slider 42 and the piston sealing rod 43 are fixedly connected to the push rod structure 41.

[0093] In this embodiment, by setting the push rod assembly 4, after the surgeon holds the handle module 3 well, the push rod assembly 4 can be directly pushed with the thumb, so that the conductive tube 12 and the tool tube structure 23 fixed to its end extend outward or retract inward, realizing the state switching of the corresponding thermal energy and cold energy treatment operations.

[0094] The limit slider 42 and the piston sealing rod 43 provided in this embodiment can facilitate the assembly of the push rod assembly 4. The push rod structure 41 includes a push head sliding key 411 and a sliding key mounting ring 412 that are fixedly connected. The sliding key mounting ring 412 is clamped on the limit slider 42 and the piston sealing rod 43, so that the limit slider 42 and the piston sealing rod 43 cannot be separated from the push rod structure 41 and slide freely along the axial direction of the conductive tube 12. In this embodiment, a closed active cavity 421 is provided in the limit slider 42, and the piston sealing rod 43 is inserted in the closed active cavity 421, so that after the external high-pressure gas enters the closed active cavity 421, it flows toward the cutting module 2 through the internal channel of the conductive tube 12 fixed in the piston sealing rod 43.

[0095] In this embodiment, a conductive and fixed contact spring 61 and a wire pressing terminal 62 are also provided in the handle module 3. The wire pressing terminal 62 is conductively connected to the cable, and the elastic end of the contact spring 61 is pressed against the conductive tube 12 to be conductively connected thereto. By providing the contact spring 61, the conductive tube 12 is in a conductive connection state during the process of extending or retracting, so that other control structures can be used to control the on and off of the current circuit.

[0096] In this embodiment, Figure 4 and Figure 11 As shown, a plunger accommodating groove 301 is also provided in the handle module 3, and the push rod assembly 4 also includes a plunger body 44 arranged in the plunger accommodating groove 301, and the plunger body 44 presses on the side of the limit slider 42, and a plurality of limit slots 422 evenly distributed along the axial direction of the conductive tube 12 are also provided on the side of the limit slider 42, so that when the doctor pushes the push head sliding key 411, there is a damping feel of a jam, and it is ensured that after it is in place, the conductive tube 12 will not move again when no thrust is applied.

[0097] Specifically, in this embodiment, Figure 1 As shown, the handle module 3 is also provided with a first switch for controlling the current circuit and a second switch for controlling the airflow circuit. By setting the first switch and the second switch on the handle module 3, the current circuit and the airflow circuit can be conveniently controlled, so that the surgeon can control and switch the thermal energy treatment state and the cold energy treatment state of the instrument without changing hands.

[0098] Specifically, Figure 1 and Figure 2 As shown, it also includes an air outlet pipe 5 connected to the third exhaust interlayer 27 , and the air outlet pipe 5 is connected to the end of the sheath tube assembly 1 away from the cutting module 2 to prevent the airflow of the third exhaust interlayer 27 from flowing back into the handle module 3 .

[0099] Embodiment 2:

[0100] like Figure 12As shown in the figure, this embodiment provides a minimally invasive cutting knife system for an endoscope with changeable cold and heat treatment states, which includes a minimally invasive cutting knife for an endoscope with changeable cold and heat treatment states described in Embodiment 1 above, and further includes a controller and a gas source module. The gas source module includes a gas tank 81 and a gas flow control valve 82. The controller is communicatively connected to the signal input end of the gas flow control valve 82;

[0101] The high-pressure gas outlet pipe 5 of the gas source module is communicated with the conductive pipe 12 through the gas flow control valve 82.

[0102] In this embodiment, the gas in the gas tank 81 can be high-pressure carbon dioxide, nitrogen or other gases. The gas flow control valve 82 can adopt conventional components such as an electronically controlled proportional valve. Specific selection can be determined by those skilled in the art according to requirements and will not be elaborated here.

[0103] In this embodiment, due to the presence of the patch-type temperature sensor 7, when the patch-type temperature sensor 7 in this embodiment monitors that the temperature does not meet the standard, the controller can be used to control the gas flow control valve 82 to make adjustments, so that the air pressure is adjusted, and then the temperatures of structures such as the cutter tube structure 23, the cutter tube end cover 24, and the cutter tube end head 232 are increased or decreased to adapt to the cold energy treatment operation.

[0104] The remaining structures of this embodiment are the same as those of Embodiment 1 above and will not be elaborated here.

[0105] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A minimally invasive cutting knife for an endoscope with a changeable cold and heat therapy state, characterized in that, It includes a sheath tube assembly (1) and a cutting module (2); The sheath tube assembly (1) includes a conductive tube (12) disposed inside an outer sheath tube (11); The cutting module (2) includes a cutter tube structure (23) and a high-pressure nozzle (22) fixed inside the cutter tube structure (23); The cutter tube structure (23) is electrically and hermetically fixedly connected to the end of the conductive tube (12), and the air inlet end of the high-pressure nozzle (22) is communicated with the internal channel of the conductive tube (12); A closed pressure relief cavity (29) for quickly relieving pressure after the high-pressure gas in the high-pressure nozzle (22) is ejected is provided at the end of the cutter tube structure (23). The gas jet port (222) of the high-pressure nozzle (22) is arranged towards the closed pressure relief cavity (29), and a second exhaust interlayer (26) communicated with the closed pressure relief cavity (29) is provided between the high-pressure nozzle (22) and the cutter tube structure (23); One end of the cutter tube structure (23) away from the conductive tube (12) is provided with a cutter tube end head (232), and the cross-sectional dimension of the cutter tube end head (232) is larger than that of the cutter tube structure (23); The cutting module (2) further includes a cutter tube end cover (24) and a return spring (25). The cutter tube end cover (24) is buckled on the cutter tube end head (232) and is slidably connected thereto. A closed pressure relief cavity (29) is formed between the buckled cutter tube end cover (24) and the cutter tube end head (232). The return spring (25) is arranged inside the closed pressure relief cavity (29), and its two ends are respectively fixed on the cutter tube end cover (24) and the cutter tube end head (232). Under the action of the return spring (25), the cutter tube end cover (24) can be reset and wrap the cutter tube end head (232) therein; A limit ring protrusion (233) for preventing the cutter tube end cover (24) from slipping and playing a sealing role is further provided on the outer peripheral wall of the cutter tube end head (232).

2. The minimally invasive cutter for an endoscope with a replaceable cold and heat therapy state according to claim 1, characterized in that, The sheath tube assembly (1) further includes an outer sheath tube (11), and a first exhaust interlayer (13) is provided between the outer sheath tube (11) and the conductive tube (12); The cutting module (2) further includes a cutter sleeve structure (21) fixed inside the first exhaust interlayer (13); The cutter tube structure (23) is disposed inside the cutter sleeve structure (21) and is slidably and hermetically connected thereto. A third exhaust interlayer (27) communicated with the first exhaust interlayer (13) is provided between the cutter tube structure (23) and the cutter sleeve structure (21), and a vent hole (231) for communicating the second exhaust interlayer (26) and the third exhaust interlayer (27) is provided on the cutter tube structure (23).

3. The minimally invasive cutter for an endoscope with changeable cold and heat therapy states according to claim 2, characterized in that, An installation ring groove (211), as well as an outer ring edge (212) or / and an inner ring edge (213), are further provided on the inner peripheral wall of the cutter sleeve structure (21); The outer ring edge (212) is located on the side of the installation ring groove (211) away from the conductive tube (12), and the inner ring edge (213) is located on the side of the installation ring groove (211) close to the conductive tube (12); Both the outer ring edge (212) and the inner ring edge (213) are arranged in a ring shape close to the outer peripheral wall of the cutter tube structure (23); The cutting module (2) further includes a cutter tube seal ring (28) installed in the installation ring groove (211), and the cutter tube structure (23) is slidably and sealingly connected to the cutter sleeve structure (21) through the cutter tube seal ring (28).

4. The minimally invasive cutter for an endoscope with changeable cold and heat therapy states according to claim 3, characterized in that, Both an outer ring cutting edge (212) and an inner ring cutting edge (213) are provided in the cutter sleeve structure (21); The cutting edges of the outer ring cutting edge (212) and the inner ring cutting edge (213) are both inclined outwardly.

5. The minimally invasive cutter for endoscope with replaceable cold and heat therapy states according to claim 1, characterized in that, It further includes a patch type temperature sensor (7), the monitoring end of the patch type temperature sensor (7) is fixedly attached to the cutter tube structure (23), and its signal cable extends away from the cutting module (2) through the first exhaust sandwich layer (13).

6. The minimally invasive cutter for an endoscope with a replaceable cold and heat therapy state according to claim 1, characterized in that, It further includes a handle module (3), and a push rod assembly (4) for driving the conductive tube (12) to reciprocate axially. The push rod assembly (4) is arranged on the handle module (3), and the push rod assembly (4) includes a push rod structure (41), a limit slider (42), and a piston sealing rod (43); The conductive tube (12) is fixed to the piston sealing rod (43), the piston sealing rod (43) is inserted into the limit slider (42), and both the limit slider (42) and the piston sealing rod (43) are fixedly connected to the push rod structure (41).

7. A minimally invasive cutter for an endoscope with changeable cold and heat therapy states according to claim 6, characterized in that, A first switch for controlling the current loop and a second switch for controlling the air flow loop are further provided on the handle module (3).

8. The minimally invasive cutter for endoscope with changeable cold and heat therapy state according to claim 1, characterized in that, It further includes an air outlet pipe (5) communicated with the third exhaust sandwich layer (27), and the air outlet pipe (5) is connected to one end of the sheath tube assembly (1) away from the cutting module (2).

9. A minimally invasive cutting knife system for an endoscope with a changeable cold and heat therapy state, characterized in that, It includes a minimally invasive cutter for an endoscope with a changeable cold and heat therapy state according to any one of claims 1-8, and further includes a controller and an air source module. The air source module includes an air tank (81) and an air flow control valve (82), and the controller is communicatively connected to the signal input end of the air flow control valve (82); The high-pressure air outlet pipe (5) of the air source module is communicated with the conductive tube (12) through the air flow control valve (82).

Images