Vacuum-pumping pipe cavity switching structure of flexible freezing conduit

Abstract

The utility model provides a flexible freezing catheter vacuumizing pipe cavity switching structure which comprises a first cavity, a second cavity, a first connecting pipe, a second connecting pipe, a second connecting pipe and a third cavity, the far end of the first cavity is communicated with a first pipeline, and the near end of the first cavity is communicated with a second pipeline; the far end of the second chamber is communicated with the third pipeline, and the near end of the second chamber is communicated with the fourth pipeline; the fifth pipeline penetrates through the first chamber and the second chamber, and the fifth pipeline comprises a first end part and a second end part; the first end parts of the first pipeline, the third pipeline and the fifth pipeline are sequentially sleeved from outside to inside along the radial direction, and the second end parts of the second pipeline, the fourth pipeline and the fifth pipeline are mutually independent. According to the flexible freezing conduit vacuumizing pipe cavity switching structure, the concentric structure formed by sequentially sleeving the first ends of the first pipeline, the third pipeline and the fifth pipeline in the radial direction from outside to inside is converted into the parallel tubular structure, so that all gas paths are separated and do not interfere with one another, and the high vacuum degree can be formed.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of medical device technology, and in particular to a flexible cryocatheter vacuum lumen transition structure. Background Art

[0002] At present, the multiple pipelines are arranged in a relatively simple manner, such as multiple pipelines are arranged on top of each other or multiple pipelines are independent of each other. However, in some cases, the mutually arranged pipelines need to be converted into multiple independent pipelines. For example, in tumor ablation technology, ablation needles are required for treatment.

[0003] If an ablation needle with a flexible external tube is used, the tube that enters the human body is relatively long (about 1m), and the outer tube material is usually a flexible polymer material, and the degassing coefficient under vacuum conditions is very high, so it will be difficult to maintain the high vacuum of the needle tube for a long time. It is also difficult to form a high vacuum in the ablation needle. The working end is a coaxial tube sleeve structure, and the air inlet, return and vacuum layers are coaxial structures. Such a structure is not conducive to the formation of a high vacuum. It is necessary to study a method of converting the coaxial structure into a side-by-side three-way structure, so that the vacuum layer becomes a single way to achieve a high vacuum using a vacuum pump. Utility Model Content

[0004] In view of the above problems, the present application provides a flexible cryocatheter vacuum lumen transition structure to overcome the above problems or at least partially solve the above problems.

[0005] The embodiment of the present application provides a flexible cryoconduit vacuum tube cavity transition structure, which includes: a first chamber, the distal end of the first chamber is connected to a first pipeline, and the proximal end of the first chamber is connected to a second pipeline; a second chamber, the distal end of the second chamber is connected to a third pipeline, and the proximal end of the second chamber is connected to a fourth pipeline; a fifth pipeline, which runs through the first chamber and the second chamber, and the fifth pipeline includes a first end and a second end; the first ends of the first pipeline, the third pipeline and the fifth pipeline are sequentially sleeved from the outside to the inside in the radial direction, and the second ends of the second pipeline, the fourth pipeline and the fifth pipeline are independent of each other.

[0006] Optionally, the first chamber includes: a first shell, the distal end of which is connected to the first pipeline; a second shell, the proximal end of which is suitable for being connected to the distal end of the first shell; the second chamber includes a return air shell, the distal end of which is suitable for being connected to the fifth pipeline and the third pipeline respectively, and the return air shell forms the first chamber with the first shell and the second shell; the proximal end of the tubular cavity transition structure is provided with a base which is respectively connected to the second chamber and the first chamber, the base forms the second chamber with the return air shell, and the base is suitable for being connected to the proximal end of the second shell, and the second shell can adjust the connection position with the first shell and the air seat based on the length of the fifth pipeline.

[0007] Optionally, the proximal end of the first shell is provided with a first side wall and a first boss connected to the first side wall, and the distal end of the second shell is provided with a second boss and a second side wall connected to the second boss. The second boss can move relative to the first boss to adjust the contact area between the second boss and the first boss. When the second boss moves to the farthest end, the second boss abuts the first side wall, and the second side wall abuts the first boss.

[0008] Optionally, the base is provided with a guide pipeline sleeved on the outside of the fifth pipeline, and the guide pipeline can move axially relative to the fifth pipeline during assembly, and the guide pipeline is connected to the fifth pipeline when the assembly is completed.

[0009] Optionally, the base is provided with a connecting portion extending in the axial direction, and the axial width of the connecting portion is such that when the fifth pipeline and the guide pipeline are assembled, at least a part of the connecting portion contacts the proximal end of the second shell.

[0010] Optionally, a base is provided at the proximal end of the flexible cryocatheter vacuum lumen transition structure, the base is connected to the first chamber and the second chamber respectively, and the second pipeline and the fourth pipeline are connected to the first chamber and the second chamber respectively via the base, and the fifth pipeline runs through the base.

[0011] Optionally, at least one of the second pipeline and the fourth pipeline is communicated with the first chamber and / or the second chamber respectively through a transfer pipeline provided on the base.

[0012] Optionally, the transfer pipe includes a first pipe portion and a second pipe portion extending in the axial direction, and a third pipe portion extending in the radial direction, and the third pipe portion is communicated with the first pipe portion and the second pipe portion respectively.

[0013] Optionally, the first pipeline is clamped between the external pipeline and the second pipeline, and the external pipeline is closed and connected to the distal end of the second pipeline. The flexible freezing catheter vacuum lumen transition structure also includes a needle connected to the distal end of the external pipeline, and the third pipeline is connected to the first end of the fifth pipeline.

[0014] Optionally, the first end is connected to the needle, and a distal end of the first end is provided with at least one through hole.

[0015] Optionally, a gap is provided between the distal end of the first end and the needle.

[0016] Optionally, the second pipeline is connected to a vacuum forming device, and when the vacuum forming device is in operation, a vacuum is formed among the first pipeline, the first chamber and the second pipeline.

[0017] Optionally, the proximal ends of the second ends of the second pipeline, the fourth pipeline and the fifth pipeline are connected to quick connectors, and the quick connectors are connected to the refrigerant medium output device and the refrigerant medium recovery device.

[0018] Optionally, a temperature measuring device is passed through the third pipeline, and the temperature measuring device is in contact with the needle; the needle is connected to a radio frequency circuit, and the radio frequency circuit is also electrically connected to an energy generating device to transmit the energy generated by the energy generating device to the needle.

[0019] It can be seen from the above technical solutions that the first end of the first pipeline, the third pipeline and the fifth pipeline of the flexible cryotube vacuum lumen transition structure of the embodiment of the present application is converted into a parallel tubular structure by sequentially sleeved from the outside to the inside along the radial direction, so that each gas path is separated and does not interfere with each other, and a high vacuum degree can be formed. The vacuum forming layer is expanded to the first chamber with a larger space through the flexible cryotube vacuum lumen transition structure, so that the vacuuming technology is realized inside the second pipeline and the first chamber.

[0020] The design of the first boss 113 and the second boss 114 of the embodiment of the present application can be adjusted to cooperate with the position of the base 111. Even if a gap is generated between the first side wall 112 of the first shell 102 and the side wall of the second boss 114 of the second shell 134, the first boss 113 and the second boss 114 can be tightly sealed and connected.

[0021] At the same time, since the first shell 102 and the second shell 134 are independent of each other before assembly and are only assembled when used, compared with the structure in which the first shell 102 and the second shell 134 are integrally formed, the distal end of the second chamber 110 of the embodiment of the present application can be more accurately and efficiently welded to the outside of the intake pipe and the return pipe. However, in the structure in which the first shell 102 and the second shell 134 are integrally formed, since the axial depth of the first shell 102 and the second shell 134 is large, the distal end of the second chamber 110 requires multiple attempts to be welded to the accurate position. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a cross-sectional view along an angle of an embodiment of a flexible cryo-catheter vacuum lumen transition structure of the present application;

[0024] Figure 2 It is a cross-sectional view along another angle of an embodiment of a flexible cryo-catheter vacuum lumen transition structure of the present application;

[0025] Figure 3 It is a stereoscopic view of an embodiment of a flexible cryo-catheter vacuum lumen transition structure of the present application, with the base facing the distal end;

[0026] Figure 4 It is a stereoscopic view of an embodiment of a flexible cryo-catheter vacuum lumen transition structure of the present application, with the base facing the proximal end;

[0027] Figure 5A-5B They are cross-sectional views of a base of a flexible cryo-catheter vacuum lumen adapter structure of the present application along different viewing angles;

[0028] Figure 6A-6B They are cross-sectional views of two embodiments of the needle part of the present application;

[0029] Figure 7 It is a schematic diagram of an application embodiment of a flexible cryo-catheter vacuum lumen transition structure of the present application;

[0030] Figure 8 It is a cross-sectional view of a split structure of a flexible multi-modal ablation needle vacuum housing of the present application;

[0031] Fig. 9 It is a cross-sectional view of a first shell and a second shell of a split structure of a flexible multi-modal ablation needle vacuum shell of the present application when they are not assembled;

[0032] Figure 10-12 They are schematic diagrams of different embodiments of the connection part between the split structure first shell and the second shell of a flexible multi-modal ablation needle vacuum shell of the present application.

[0033] Component number

[0034] 10: tube cavity transfer structure; 103: first chamber; 105: first pipeline; 121: second pipeline; 110: second chamber; 104: third pipeline; 122: fourth pipeline; 123: fifth pipeline; 124: first end; 125: second end; 111: base; 112: transfer pipeline; 126: first tube; 127: second tube; 128: third tube; 102: external pipeline; 101: needle; 106: through hole; 129: gap; 114: quick connector; 115: handle;

[0035] 201: vacuum housing; 102: first housing; 105: first pipeline; 134: second housing; 105: return air housing; 123: fifth pipeline; 104: third pipeline; 103: first chamber; 111: base; 110: second chamber; 112: first side wall; 113: first boss; 114: second boss; 115: second side wall; 116: guide pipeline; 117: connecting part; 118: first transfer pipeline; 119: second transfer pipeline; 221: temperature measuring device; 222: radio frequency circuit. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0037] The “distal end” mentioned here refers to the left end of the flexible cryocatheter vacuum lumen transition structure shown in the figure; the “proximal end” mentioned here refers to the right end of the flexible cryocatheter vacuum lumen transition structure shown in the figure.

[0038] The specific implementation of the embodiment of the present application is further explained below in conjunction with the accompanying drawings of the embodiment of the present application.

[0039] See also Figures 1 to 8In a specific implementation of the present application, a flexible cryo-catheter vacuum tube cavity transition structure 10 is provided, and the flexible cryo-catheter vacuum tube cavity transition structure 10 includes: a first chamber 103, the distal end of the first chamber 103 is connected to the first pipeline 105, and the proximal end of the first chamber 103 is connected to the second pipeline 121; a second chamber 110, the distal end of the second chamber 110 is connected to the third pipeline 104, and the proximal end of the second chamber 110 is connected to the fourth pipeline 122; a fifth pipeline 123, which runs through the first chamber 103 and the second chamber 110, and the fifth pipeline 123 includes a first end 124 and a second end 125; the first end 124 of the first pipeline 105, the third pipeline 104 and the fifth pipeline 123 are sequentially arranged from the outside to the inside in the radial direction, and the second end 125 of the second pipeline 121, the fourth pipeline 122 and the fifth pipeline 123 are independent of each other.

[0040] The external pipeline 102 can be made of a flexible pipe with good lubricity and insulation. The material of the external pipeline 102 can be a polymer material such as PTFE, Nylon, PEBAX, etc. The outer diameter of the external pipeline 102 can be between 1 mm and 4 mm, and the length can be between 100 mm and 3000 mm. The material of the fifth pipeline 123105 can be metal, such as stainless steel 304, 316L, brass, copper, etc. The material of the third pipeline 104 and the fourth pipeline 122 can be PTFE, Nylon, PEBAX, etc.

[0041] In one embodiment, a base 111 is provided at the proximal end of the flexible cryocatheter vacuum lumen adapter structure 10, and the base 111 is respectively connected to the first chamber 103 and the second chamber 110, and the second pipeline 121 and the fourth pipeline 122 are respectively connected to the first chamber 103 and the second chamber 110 via the base 111, and the fifth pipeline 123 runs through the base 111.

[0042] In one embodiment, at least one of the second pipeline 121 and the fourth pipeline 122 is communicated with the first chamber 103 and / or the second chamber 110 respectively through a transfer pipeline 112 disposed on the base 111 .

[0043] In one embodiment, the transfer pipe 112 includes a first pipe portion 126 and a second pipe portion 127 extending in the axial direction, and a third pipe portion 128 extending in the radial direction. The third pipe portion 128 is connected to the first pipe portion 126 and the second pipe portion 127 respectively.

[0044] In one embodiment, the first pipeline 105 is clamped between the external pipeline and the second pipeline 121, and the external pipeline is closed and connected to the distal end of the second pipeline 121. The flexible cryocatheter vacuum lumen adapter structure 10 also includes a needle 101 connected to the distal end of the external pipeline, and the third pipeline 104 is connected to the first end 124 of the fifth pipeline 123.

[0045] In one embodiment, the first end portion 124 is connected to the needle 101 , and at least one through hole 106 is disposed at a distal end of the first end portion 124 .

[0046] In one embodiment, a gap 129 is defined between the distal end of the first end portion 124 and the needle 101 .

[0047] In one embodiment, the second pipeline 121 is connected to a vacuum forming device. When the vacuum forming device is in operation, a vacuum is formed among the first pipeline 105, the first chamber 103 and the second pipeline 121.

[0048] In one embodiment, the proximal ends of the second ends 125 of the second pipeline 121 , the fourth pipeline 122 , and the fifth pipeline 123 are connected to a quick connector 114 , and the quick connector 114 is connected to a refrigerant medium output device and a refrigerant medium recovery device.

[0049] In one embodiment, a temperature measuring device is provided in the third pipeline 104, and the temperature measuring device is in contact with the needle 101; the needle 101 is connected to a radio frequency circuit, and the radio frequency circuit is also electrically connected to an energy generating device to transmit the energy generated by the energy generating device to the needle 101. The temperature measuring device 115 may be a thermocouple or other temperature measuring devices.

[0050] In one embodiment, the flexible cryocatheter vacuum lumen adapter structure 10 is applied to a multimodal ablation device, the first chamber 103, the first pipeline 105 and the second pipeline 121 together form a vacuum layer, the third pipeline 104, the second chamber 110 and the fourth pipeline 122 together form a return air pipeline, and the fifth pipeline 123 is an air intake pipeline.

[0051] In one embodiment, the flexible cryocatheter vacuum lumen adapter structure 10 includes: a needle 101; an external pipeline 102, the distal end of which is connected to the needle 101, and the external pipeline 102 radially covers the distal ends of a first pipeline 105, a third pipeline 104 and a fifth pipeline 123 in sequence from the outside to the inside, wherein the distal end of the fifth pipeline 123 is connected to the needle 101, and the distal end of the fifth pipeline 123 is provided with an exhaust hole 106; the freezing medium enters the third pipeline 104 from the fifth pipeline 123 via the exhaust hole 106; the first pipeline 105 is connected to a vacuum forming device 107, so that when the vacuum forming device 107 is working, the first pipeline 105 forms a vacuum.

[0052] The flexible cryo-catheter vacuum lumen adapter structure 10 is provided with: a first chamber 103 , which is communicated with the first pipeline 105 ; and a second chamber 110 , which is communicated with the third pipeline 104 .

[0053] In one embodiment, a hollow handle 115 may be provided on the outside of the flexible cryocatheter vacuum lumen transition structure 10, and the handle 115 covers the flexible cryocatheter vacuum lumen transition structure 10 from the outside.

[0054] The main difference between the flexible multimodal ablation needle in the embodiment of the present application and the traditional multimodal ablation needle (percutaneous puncture type) is that the pipeline of the flexible multimodal ablation needle entering the human body is longer (about 1m), and the outer tube material is usually a flexible polymer material with a high degassing coefficient under vacuum conditions. Therefore, if a conventional probe is used to pre-make a vacuum tube, the high vacuum degree of the flexible probe needle tube will be difficult to maintain for a long time.

[0055] During the operation, the endoscope first passes through the natural cavity of the human body (oral cavity, anus, urethra, etc.), cooperates with the light source and imaging system of the endoscope to enter and find the lesion location, and then the flexible cryo-catheter vacuum lumen adapter structure 10 enters through the instrument channel of the endoscope until the lesion tissue is surgically treated, thereby solving the technical problem that the metal hard rod of the probe cannot bend and enter the natural cavity, and can only enter through puncture of the needle 101. It avoids skin damage and bleeding caused by puncture.

[0056] The working modes of existing probes are all single freezing or radio frequency modes, which are difficult to achieve the freezing requirements of precise control and rapid pre-cooling of multimodal ablation. Due to different patients and different lesion organs, the location of the lesion will also be different. For example, if the lesion location is more demanding, the difficulty of the operation will be increased, the operation time will be prolonged, and the success rate of the operation will be reduced. The endoscope can enter the demanding lesion location from the natural cavity of the human body through the bending angle of the front end. The multimodal ablation device uses the internal channel of the endoscope to enter and finally reach the lesion location through its own bending for surgical treatment. The probe can only perform destructive puncture on the tissue, and once the wall of the cavity is penetrated, the result is often fatal.

[0057] The first pipeline 105, the first chamber 103 and the second pipeline 121 form a vacuum layer structure. The vacuum forming device 107 can evacuate the vacuum layer structure in real time. When the vacuum degree of the vacuum layer structure reaches the required requirement, the multimodal ablation device starts the transmission work. During the entire operation of the multimodal ablation device, the vacuum forming device 107 always keeps working to ensure the maintenance of the vacuum degree of the vacuum layer structure. When the flexible cryocatheter vacuum lumen adapter structure 10 finishes working, the vacuum forming device 107 also stops working.

[0058] When the multimodal ablation device is working during surgery, the cryogenic medium will reach the needle 101 through the fifth pipeline 123 to perform cryoablation on the tumor tissue. If the flexible cryocatheter vacuum lumen adapter structure 10 is frosted on other parts except the needle 101, the liquid nitrogen cooling will be lost, so that the temperature at the needle 101 cannot reach the cryotherapy temperature, and other frosted parts will damage the normal tissue in the human body cavity. Therefore, the vacuum layer is indispensable. The real-time vacuuming technology ensures the maintenance of the vacuum degree of the vacuum layer during the operation, improves the success rate of the operation, and the vacuum layer plays an insulating role when the ablation needle is working. At present, the vacuum layer of the probe is mostly pre-processed, rather than real-time suction. If the vacuum layer leaks or the vacuum degree decreases before use, it will cause damage to the patient and the instrument. The connection method between the second pipeline 121 and the vacuum forming device 107 can be a VCR joint sealing connection, or it can be connected and sealed by a metal lead-out tube and a latex tube. The connection method is not limited as long as it can play a sealing role.

[0059] The base 111 can play the role of connection, sealing and transition. The fifth pipeline 123 can be connected to the base 111 by welding, the third pipeline 104 can be connected to the first chamber 103 by welding, and the proximal end of the external pipeline 102 is connected to the handle 115 or the flexible cryo-catheter vacuum lumen transfer structure 10 to play the role of fixing and sealing. The proximal end of the base 111 is provided with five channels, one of which is a radio frequency channel, and the radio frequency line is connected to the base 111 to realize the radio frequency function; one is a temperature measurement channel, and the far end of the thermocouple is connected to the needle 101, and the middle passes through the base 111 to reach the quick connector 114 to realize the temperature measurement function; the remaining three are gas channels, the fifth pipeline 123 is connected to the second air inlet pipeline through a welding joint, the second chamber 110 is connected to the fourth pipeline 122 through a welding joint, and the first chamber 103 is connected to the second pipeline 121 through a welding joint, thereby, the first pipeline 105, the third pipeline 104 and the fifth pipeline 123 are converted from the concentric structure of the pipeline to a parallel tubular structure, so that each gas path is separated and does not interfere with each other, and the formation of a high vacuum degree can be realized. The first pipeline 105 is expanded to the first chamber 103 with a larger space through the flexible cryotube vacuum lumen adapter structure 10, so that the vacuum technology is realized inside the second pipeline 121 and the first chamber 103.

[0060] The thermocouple can reach the needle 101 through the first pipeline 105 or the third pipeline 104. The reaching method is not limited as long as the radiofrequency ablation function can be realized. The freezing line connector and the radiofrequency line 116 connector connected to the host are internally installed with identification resistors. When the ablation needle is connected to the host, the host can identify whether it is inserted in place. When it is not inserted in place or missed, an alarm will be prompted.

[0061] See also Figures 8 to 12In a specific implementation of the present application, the first chamber includes a vacuum housing 201, including: a first housing 102, the distal end of which is connected to the first pipeline 105; a second housing 134, the proximal end of which is suitable for connecting to the distal end of the first housing 102; the second chamber includes a return air housing 105, the distal end of which is suitable for connecting to the fifth pipeline 123 and the third pipeline 104 respectively, and the return air housing 105 and the vacuum housing 201 form a first chamber. The first housing 103 is provided with a base 111, which forms a second chamber 110 with the return air housing 105, and the base 111 is suitable for connecting with the distal end of the second housing 134; the fifth pipeline 123 is arranged in the first pipeline 105, and passes through the first chamber 103, the second chamber 110 and the base 111 respectively, and extends from the proximal end of the base 111, and the second housing 134 can adjust the connection position with the first housing 102 and the base 111 based on the length of the fifth pipeline 123. The "distal end" refers to the left end of the split structure shown in the figure; the "proximal end" refers to the right end of the split shown in the figure.

[0062] In one embodiment, the first housing 102 has a first side wall 112 and a first boss 113 connected to the first side wall 112 at its proximal end, and a second boss 114 and a second side wall 115 connected to the second boss 114 at its distal end. The second boss 114 can move relative to the first boss 113 to adjust the contact area between the second boss 114 and the first boss 113. When the second boss 114 moves to the farthest end, the second boss 114 abuts against the first side wall 112, and the second side wall 115 abuts against the first boss 113. The shapes of the upper surfaces of the first boss 113 and the second boss 114 can be Figure 8 and Fig. 9 The side walls of the first boss 113 and the second boss 114 may be vertical planes ( Figure 8-9 ), obliquely extending planes (such as Figure 10-11 ), curved planes (such as Fig.12 ) or any other suitable plane.

[0063] In one embodiment, the base 111 is provided with a guide pipe 116 sleeved on the outside of the fifth pipe 123, and the guide pipe 116 can move axially relative to the fifth pipe 123 during assembly, and the guide pipe 116 is connected to the fifth pipe 123 when the assembly is completed.

[0064] In one embodiment, the base 111 is provided with a connecting portion 117 extending in the axial direction, and the axial width of the connecting portion 117 is such that when the fifth pipeline 123 is assembled with the guide pipeline 116, at least a portion of the connecting portion 117 contacts the proximal end of the second housing 134. The base 111 is communicated with the second chamber 110 and the first chamber 103 respectively. The fifth pipeline 123 and the third pipeline 104 are both disposed in the first pipeline 105, and the proximal end of the third pipeline 104 is communicated with the second chamber 110.

[0065] In one embodiment, the base 111 is provided with: a first transfer tube 118 communicating with the second chamber 110 ; and a second transfer tube 119 communicating with the first chamber 103 .

[0066] In one embodiment, the third pipeline 104 is coaxially sleeved on the outside of the fifth pipeline 123, and a vacuum forming layer is provided between the third pipeline 104, the needle and the first pipeline 105. In another embodiment, the third pipeline 104 and the fifth pipeline 123 can be and are set to be independent of each other, and a vacuum forming layer is provided between the third pipeline 104 and the fifth pipeline 123, the needle and the first pipeline 105. The first chamber and the second chamber form an independent cavity structure for the air intake pipeline and the air return pipeline, and they do not interfere with each other during operation.

[0067] In one embodiment, the distal end of the first pipeline 105 is connected to the needle, and the fifth pipeline 123 is connected to the needle; the third pipeline 104 is provided with a temperature measuring device 221, and the proximal end of the temperature measuring device 221 is connected to the host. The temperature measuring device 221 can be a thermocouple. The base 111 is connected to the radio frequency line 222, and the proximal end of the radio frequency line 222 is connected to the host to transmit the energy generated by the host to the base 111, and then to the needle via the fifth pipeline 123.

[0068] The first pipeline 105 can be made of a flexible pipe with good lubricity and insulation. The material of the first pipeline 105 can be a polymer material such as PTFE, Nylon, PEBAX, etc. The outer diameter of the first pipeline 105 can be between 1 mm and 4 mm, and the length can be between 100 mm and 3000 mm. The material of the fifth pipeline 123105 can be metal, such as stainless steel 304, 316L, brass, copper, etc. The material of the third pipeline 104 and the fourth pipeline 222 can be PTFE, Nylon, PEBAX, etc.

[0069] In one embodiment, the first chamber 103 may be connected to a vacuum pipeline, and connected to a vacuum forming device (such as a vacuum pump) through the vacuum pipeline. When the vacuum forming device is working, the vacuum forming layer, the first chamber 103, and the vacuum pipeline form a vacuum. When the vacuum degree reaches the required requirement, the multimodal ablation device starts the transmission work. During the entire working period of the multimodal ablation device, the vacuum forming device always keeps working to ensure the maintenance of the vacuum degree of the vacuum layer structure.

[0070] The second chamber 110 can also be connected to the freezing medium recovery device through another third pipeline, and the fifth pipeline 123 is connected to the freezing medium output device. When the freezing medium output device and the freezing medium recovery device are working, the freezing medium output by the freezing medium output device enters the fifth pipeline 123, and then is recovered to the freezing medium recovery device through the third pipeline 104.

[0071] The pipelines and parts all have dimensional tolerances, and when assembled together, the tolerances will be accumulated. The assembled parts need to be fixed and sealed, so there are certain requirements for the assembly dimensions. The split structure of the vacuum housing 201 can effectively make up for the assembly difficulty caused by the accumulated tolerances, and can become a dimensional compensation structure. If there is a slight error in the assembly dimensions, the assembly position of the second housing 134 can be adjusted by displacement when the first housing 102 and the second housing 134 are assembled, ensuring that the welding points between the two vacuum housings 201 and the welding points between the second housing 134 and the base 111 both play a fixing and sealing role.

[0072] In one embodiment, the distal end of the first housing 102 is first assembled with the first pipeline 105, and then the guide pipeline 116 is assembled on the base 111, and then the fifth pipeline 123 is assembled in the guide pipeline 116. At this time, the proximal end of the guide pipeline 116 needs to be aligned with the proximal end of the fifth pipeline 123, so the relative position of the base 111 and the second housing 134 needs to be adjusted. When the base 111 needs to be adjusted toward the proximal end, a gap will be generated between the first side wall 112 of the first housing 102 and the side wall of the second boss 114 of the second housing 134, and the design of the first boss 113 and the second boss 114 can be coordinated with the position adjustment of the base 111. Even if a gap is generated between the first side wall 112 of the first housing 102 and the side wall of the second boss 114 of the second housing 134, the first boss 113 and the second boss 114 can be tightly sealed and connected. The sealed connection method can be welding.

[0073] At the same time, since the first shell 102 and the second shell 134 are independent of each other before assembly and are only assembled when used, compared with the structure in which the first shell 102 and the second shell 134 are integrally formed, the distal end of the second chamber 110 of the embodiment of the present application can be more accurately and efficiently welded to the outside of the intake pipe and the return pipe. However, in the structure in which the first shell 102 and the second shell 134 are integrally formed, since the axial depth of the first shell 102 and the second shell 134 is large, the distal end of the second chamber 110 requires multiple attempts to be welded to the accurate position.

[0074] During the operation, the endoscope first passes through the natural cavity of the human body (oral cavity, anus, urethra, etc.), and enters and finds the lesion with the help of the endoscope's own light source and imaging system. Then the flexible cryo-catheter enters through the instrument channel of the endoscope until the lesion tissue is located for surgical treatment, thus solving the technical problem that the metal hard rod of the probe cannot bend and enter the natural cavity and can only enter through needle puncture. It avoids skin damage and bleeding caused by puncture.

[0075] When the multimodal ablation device is working during surgery, the cryogenic medium will reach the needle through the fifth pipeline 123 to perform cryoablation on the tumor tissue, and the vacuum layer will play an insulating role when the ablation needle is working. However, the vacuum layer of the current probe is mostly pre-processed, rather than being sucked in real time. If the vacuum layer leaks or the vacuum degree decreases before use, it will cause damage to the patient and the device. The connection method between the vacuum pipeline and the vacuum forming device can be a VCR joint sealing connection, or it can be sealed by connecting a metal lead-out tube to a latex tube. There is no restriction on the connection method as long as it can play a sealing role.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the present application 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A flexible cryo-catheter vacuum lumen switching structure, characterized in that: The lumen switching structure comprises: A first chamber, wherein a distal end of the first chamber is communicated with a first pipeline, and a proximal end of the first chamber is communicated with a second pipeline; a second chamber, wherein the distal end of the second chamber is communicated with the third pipeline, and the proximal end of the second chamber is communicated with the fourth pipeline; a fifth pipeline, which runs through the first chamber and the second chamber, and includes a first end and a second end; The first ends of the first pipeline, the third pipeline and the fifth pipeline are sleeved in sequence from outside to inside along the radial direction, and the second ends of the second pipeline, the fourth pipeline and the fifth pipeline are independent of each other.

2. The tubular cavity switching structure according to claim 1, characterized in that: The first chamber comprises: A first housing, a distal end of which is connected to a first pipeline; A second housing, the proximal end of the second housing being adapted to be connected to the distal end of the first housing; The second chamber comprises a return air housing, the distal end of which is suitable for being connected to the fifth pipeline and the third pipeline respectively, and the return air housing, the first housing and the second housing form the first chamber; The proximal end of the tubular cavity transition structure is provided with a base which is respectively connected to the second chamber and the first chamber, the base and the return air shell form the second chamber, and the base is suitable for being connected to the proximal end of the second shell, and the second shell can adjust the connection position with the first shell and the base based on the length of the fifth pipeline.

3. The tubular cavity switching structure according to claim 2, characterized in that: The proximal end of the first shell is provided with a first side wall and a first boss connected to the first side wall, and the distal end of the second shell is provided with a second boss and a second side wall connected to the second boss. The second boss can move relative to the first boss to adjust the contact area between the second boss and the first boss. When the second boss moves to the farthest end, the second boss abuts the first side wall, and the second side wall abuts the first boss.

4. The lumen switching structure according to claim 2, characterized in that: The base is provided with a guide pipeline sleeved on the outside of the fifth pipeline, and the guide pipeline can move axially relative to the fifth pipeline during assembly, and the guide pipeline is connected to the fifth pipeline when the assembly is completed.

5. The lumen switching structure according to claim 4, characterized in that: The base is provided with a connecting portion extending in the axial direction, and the axial width of the connecting portion is such that when the fifth pipeline and the guide pipeline are assembled, at least a part of the connecting portion contacts the proximal end of the second shell.

6. The tubular cavity switching structure according to claim 2, characterized in that: At least one of the second pipeline and the fourth pipeline is communicated with the first chamber and / or the second chamber respectively through a transfer pipeline arranged on the base.

7. The tubular cavity switching structure according to claim 6, characterized in that: The transfer pipe includes a first pipe portion and a second pipe portion extending in an axial direction, and a third pipe portion extending in a radial direction, wherein the third pipe portion is communicated with the first pipe portion and the second pipe portion respectively.

8. The tubular cavity switching structure according to claim 1, characterized in that: The first pipeline is clamped between the external pipeline and the second pipeline, and the external pipeline is closed and connected to the distal end of the second pipeline. The flexible freezing catheter vacuum lumen transition structure also includes a needle connected to the distal end of the external pipeline, and the third pipeline is connected to the first end of the fifth pipeline.

9. The tubular cavity switching structure according to claim 1, characterized in that: The second pipeline is connected to a vacuum forming device. When the vacuum forming device is in operation, a vacuum is formed between the first pipeline, the first chamber and the second pipeline.

10. The tubular cavity switching structure according to claim 8, characterized in that: A temperature measuring device is provided in the third pipeline, and the temperature measuring device is in contact with the needle; The needle is connected to a radio frequency circuit, and the radio frequency circuit is also electrically connected to an energy generating device so as to transmit the energy generated by the energy generating device to the needle.

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