CN115836907A

CN115836907A - Fluid channel and ablation needle system

Info

Publication number: CN115836907A
Application number: CN202211449586.0A
Authority: CN
Inventors: 刘朋; 李雪冬; 杨晶晶; 高维良; 肖剑; 黄乾富
Original assignee: Hygea Medical Technology Co Ltd
Current assignee: Hygea Medical Technology Co Ltd
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2023-03-24
Anticipated expiration: 2042-07-13
Also published as: CN115836906A; CN115137468B; CN115836907B; CN115137468A

Abstract

The invention relates to a fluid channel and an ablation needle system, relates to the technical field of ablation, and aims to improve the flexibility while ensuring convenient operation. The fluid channel comprises an inlet passage and a return passage; the inflow passage comprises a first section of inflow path and a second section of inflow path, and the flow direction of the fluid in the first section of inflow path is redirected to flow into the second section of inflow path; the backflow passage comprises a third section of backflow path and a fourth section of backflow path, and the flow direction of fluid in the third section of backflow path is redirected to flow into the fourth section of backflow path; the flow direction of the fluid in the first section of inflow path is opposite to the flow direction of the fluid in the fourth section of backflow path, and the flow direction of the fluid in the second section of inflow path is opposite to the flow direction of the fluid in the third section of backflow path.

Description

Fluid channel and ablation needle system

The present application is a divisional application with application number CN202210817968.8 entitled "non-vacuum fluid transfer device and ablation needle system".

Technical Field

The invention relates to the technical field of ablation, in particular to a fluid channel and an ablation needle system.

Background

In the surgical operation of eliminating target tissue by using cold-hot ablation, a low-temperature cryosurgery system is connected with an ablation needle by using a transmission device, and a treatment working medium is conveyed to a focus part of a patient so as to absorb heat through evaporation of a liquid refrigerant and take away heat of the focus tissue, so that the temperature of a target ablation part is reduced, and therefore, diseased cell tissue is damaged to achieve the purpose of treatment. In the existing ablation needle system, a transmission device and an ablation needle are generally coaxial, so that the system is overlarge in size in the length direction and is not beneficial to operation; and the performance in terms of flexibility still remains to be improved.

Disclosure of Invention

The invention provides a fluid channel and an ablation needle system, which are used for ensuring convenient operation and improving the flexibility.

According to a first aspect of the present invention, the present invention provides a non-vacuum fluid transfer device, comprising a first transfer unit and a second transfer unit which are communicated with each other, wherein the first transfer unit is used for transferring fluid to the second transfer unit or receiving fluid returned from the second transfer unit;

the first transmission unit comprises a first inlet pipe, a first return pipe and an outer sleeve, and the first inlet pipe and the first return pipe are arranged in the outer sleeve side by side;

the second transmission unit includes:

the second inlet pipe is provided with a first switching device, the second inlet pipe is communicated with the first inlet pipe through the first switching device, and the flow direction of the fluid in the first inlet pipe is redirected through the first switching device to flow into the second inlet pipe; and

the second return pipe is sleeved outside the second inlet pipe, a second switching device is arranged on the second return pipe, the second return pipe is communicated with the first return pipe through the second switching device, and the flow direction of fluid in the second return pipe is redirected through the second switching device to return to the first return pipe;

the first switching device is connected with the second switching device in a matching mode.

In one embodiment, the first adapter device comprises an adapter having first and second mating holes disposed therein that provide fluid communication;

the first matching hole extends along a first direction and is used for accommodating the first inflow pipe;

the second matching hole is a step hole extending along a second direction forming an included angle with the first direction, and the second matching hole is used for accommodating the second inflow pipe;

the second inflow pipe is provided with a matching end face, and the matching end face is abutted to the upper step face in the second matching hole.

In one embodiment, the second switching device comprises a three-way adapter, and a third matching hole and a fourth matching hole are arranged in the three-way adapter;

the third matching hole extends along the first direction and is used for accommodating a first return pipe of the rod;

the fourth matching hole is a stepped hole which penetrates through the three-way adapter in the second direction, the fourth matching hole is used for accommodating the second return pipe, and the penetrating end face of the second return pipe is abutted to the lower stepped surface in the fourth matching hole;

wherein the third mating bore, the fourth mating bore, the second mating bore, and the first mating bore are in fluid communication.

In one embodiment, the adapter is constructed to be an L-shaped structure, a portion of the adapter extending along the second direction is provided with a positioning table and a first taper outer wall extending from the positioning table, the first taper outer wall extends into the fourth matching hole, and an end of the three-way adapter abuts against the positioning table.

In one embodiment, the first transmission unit further comprises:

the heat insulation part is positioned in the outer sleeve and covers the outer walls of the first inlet pipe and the first return pipe; and

a flexible reinforcing part arranged between the heat insulating part and the inner wall of the outer sleeve and used for supporting the first inflow pipe and the first return pipe;

wherein the flexible reinforcement portion extends in a spiral manner in an axial direction of the outer sleeve.

In one embodiment, the second transmission unit further comprises:

the handle assembly is connected with the outer sleeve in a sealing mode, and the first adapter device and the second adapter device are contained in the handle assembly; and

the other side of the handle assembly is connected with the first quick connecting device in a sealing mode, and the first quick connecting device accommodates the second inflow pipe and the second backflow pipe.

In one embodiment, aerogel material is filled between the outer sleeve and the insulating portion and the flexibility enhancing portion;

aerogel materials are filled between the handle assembly and the first adapter device and the second adapter device.

In one embodiment, the outer wall of the first quick-connection means is provided with a mating groove having an inclined wall for forming a rolling or resilient snap-fit connection with the second quick-connection means of the ablation needle.

In one embodiment, the first quick connect device has a wedge-shaped end face with a return bore extending axially of the first quick connect device, the return bore being in fluid communication with the second return conduit.

According to a second aspect of the present invention, there is provided an ablation needle system comprising the above-mentioned non-vacuum fluid delivery device, further comprising an ablation needle detachably connected to the second delivery unit;

the ablation needle comprises a sealing vacuum outer sleeve and a backflow inlet assembly which penetrates through the sealing vacuum outer sleeve and is connected with the sealing vacuum outer sleeve in a vacuum manner;

the inflow and backflow assembly comprises an inflow core pipe in fluid communication with the second inflow pipe and an inner pipe sleeved outside the inflow core pipe, and the inner pipe is in fluid communication with the second backflow pipe;

wherein at least a portion of the inner tube is provided with a cushioning device.

In one embodiment, an outer tube is sleeved outside the inner tube, and a thin film getter is attached to both the outer wall of the inner tube and the inner wall of the outer tube.

In one embodiment, the ablation needle further comprises a needle tip and an energy exchange tube which are integrally or separately arranged, and the energy exchange tube is connected with the outer tube in a direct or indirect mode;

the energy exchange tube comprises a heat insulation cavity and a heat exchange cavity which are physically separated along the axial direction of the energy exchange tube, and the inflow core tube extends into the heat exchange cavity; the heat exchange cavity is respectively communicated with the inflow core tube and the inner tube in a fluid mode, so that the fluid flowing out of the inflow core tube is folded back in the heat exchange cavity and flows back to a position between the inflow core tube and the inner tube.

In one embodiment, the ablation needle further comprises a transfer sleeve and a second quick connect device in sealing communication with the transfer sleeve;

the conversion sleeve comprises a sealing chamber, a guide pipe penetrating through the sealing chamber and drainage holes arranged around the circumferential direction of the guide pipe, the drainage holes are communicated with the sealing chamber through fluid, and the flow inlet core pipe penetrates through the guide pipe;

the second inlet pipe and the second return pipe penetrate through the second quick connecting device and extend into the sealed chamber;

wherein the second inlet pipe is in fluid communication with the inlet core pipe to form an inlet passage;

the second return tube is in fluid communication with a return path formed by the drainage aperture and the sealed chamber to form a return passage;

the distance between the inner wall of the sealing chamber and the sealing member in the second quick connecting device in the axial direction is related to the low temperature resistance degree of the sealing member;

wherein the seal is configured to form a seal between the second quick connect device and the first quick connect device of the non-vacuum fluid transfer device.

In one embodiment, the ablation needle further comprises a sealing vacuum jacket, wherein a backflow inlet and sealing hole is formed in the sealing vacuum jacket, and the backflow inlet assembly penetrates through the backflow inlet and sealing hole;

the sealing vacuum jacket is also provided with at least 4 sealing ports distributed along the circumferential direction of the inlet/return flow and sealing holes.

According to a third aspect of the present invention, there is provided a fluid channel, more particularly, a fluid channel of an ablation needle system, comprising an inflow channel and a return channel;

the flow direction of the fluid in the first section of the flow inlet path is redirected to flow into the second section of the flow inlet path;

the backflow passage comprises a third section of backflow path and a fourth section of backflow path, and the flow direction of fluid in the third section of backflow path is redirected to flow into the fourth section of backflow path;

the flow direction of the fluid in the first section of the inflow path is opposite to the flow direction of the fluid in the fourth section of the backflow path, and the flow direction of the fluid in the second section of the inflow path is opposite to the flow direction of the fluid in the third section of the backflow path.

In one embodiment, the inflow passageway further comprises a third inflow path, wherein the first, second and third inflow paths are defined by the first delivery unit, the second delivery unit, the ablation needle, the first and second adapters.

In one embodiment, the first transfer unit comprises a first inflow tube, the second transfer unit comprises a second inflow tube, the ablation needle comprises an inflow core tube, the first inflow path is defined by the first inflow tube of the first transfer unit, the second inflow path is defined by the second inflow tube of the second transfer unit, and the third inflow path is defined by the inflow core tube of the ablation needle.

In one embodiment, the axes of the first inflow pipe and the second inflow pipe are vertical, and the first inflow pipe is communicated with the second inflow pipe through the first switching device; the first inlet pipe is redirected through the first adapter device to flow into the second inlet pipe;

the first adapter device comprises an adapter, the adapter is used for enabling the first inflow pipe and the second inflow pipe to form fluid communication, and a first matching hole and a second matching hole which form fluid communication are formed in the adapter; the first matching hole extends along a first direction and is used for accommodating a first inflow pipe; the second mating hole is configured as a stepped bore extending in a second direction at an angle to the first direction, the second mating hole for receiving a second inlet flow tube.

In one embodiment, the ablation needle further comprises a conversion sleeve and a second quick-connection device which is connected with the conversion sleeve in a sealing mode, the conversion sleeve comprises a sealing chamber and a guide tube which penetrates through the sealing chamber, and the inflow core tube penetrates through the guide tube; the second flow inlet pipe penetrates through the second quick connecting device and extends into the sealed chamber of the conversion sleeve; the second inlet duct houses a portion of the guide tube and thus a portion of the inlet core tube so as to be in fluid communication with the inlet core tube.

The second inlet pipe and the second return pipe penetrate through the second quick connecting device and extend into the sealing chamber of the conversion sleeve, the inlet core pipe penetrates through the guide pipe and is connected with the guide pipe in a sealing mode at the end side, and the inlet core pipe and the guide pipe extend into the second inlet pipe together, so that the inlet core pipe is communicated with the second inlet pipe in a fluid mode.

In one embodiment, the return circuit further comprises a first section of return path and a second section of return path, the first section of return path, the second section of return path, the third section of return path, and the fourth section of return path being defined by the first delivery unit, the second delivery unit, the ablation needle, the first adapter, and the second adapter.

In one embodiment, the ablation needle further comprises a reflux inlet assembly, the reflux inlet assembly comprises a reflux inlet core tube in fluid communication with the second reflux inlet tube and an inner tube sleeved outside the reflux inlet core tube, and the inner tube is in fluid communication with the second reflux inlet tube; the first section of the return flow path is defined by the inner wall of the inner pipe and the outer wall of the inflow core pipe.

In one embodiment, a groove in fluid communication with the sealed chamber is further provided on an end of the transition piece opposite the sealed chamber; the groove is communicated with the sealing chamber through a drainage hole, and the bottom of the groove is provided with a drainage hole extending towards the sealing chamber; the drainage hole is located the circumferencial direction of guide tube, and the drainage hole is connected with this recess and sealed cavity fluid respectively, and second section backward flow route is injectd by the recess, drainage hole and the sealed cavity of shift collar.

In one embodiment, the inner tube is in fit connection with the groove, the end of the inner tube abuts against the inner wall of the groove, and the inflow core tube is in fit connection with the guide tube, so that a first section of backflow path defined by the inner wall of the inner tube and the outer wall of the inflow core tube together is in fluid communication with the drainage hole, and the first section of backflow path is in fluid communication with a second section of backflow path.

In one embodiment, the sum of the depth of the groove and the depth of the drainage aperture in the axial direction is the axial wall thickness of the sealing chamber.

In one embodiment, the third section of the return path is defined by the return orifice of the first quick connect device, the inner wall of the second return line, and the outer wall of the second inlet line; the first quick connecting device is connected with the sealing chamber of the conversion sleeve in a sealing mode, and the backflow hole in the end portion of the first quick connecting device is communicated with the sealing chamber in a fluid mode, so that the second section backflow path is communicated with the third section backflow path in a fluid mode.

In one embodiment the fourth section of the return path is defined by a first return conduit communicating with a second return conduit via second switching means, the direction of flow of fluid in the second return conduit being redirected by the second switching means back to the first return conduit.

The axes of the first inlet pipe and the second inlet pipe are vertical to each other, the second switching device comprises a three-way adapter, and the three-way adapter is used for being connected with the adapter in a sealing manner; a third matching hole and a fourth matching hole are formed in the three-way adapter; the third mating hole is used for accommodating the first backflow pipe, the fourth mating hole is constructed as a stepped hole which runs through the three-way adapter, one side of the fourth mating hole accommodates the first taper outer wall of the adapter, the three-way adapter and the adapter form a sealing connection at the position, the other side of the fourth mating hole accommodates the second backflow pipe, the running-through end face of the second backflow pipe is abutted to the lower stepped face in the fourth mating hole, the third mating hole, the fourth mating hole, the second mating hole and the first mating hole are in fluid communication, and therefore the third section backflow path and the fourth section backflow path are in fluid communication.

Compared with the prior art, the invention has the advantages that the fluid in the first transmission unit can flow into the second transmission unit after changing the flow direction through the matching of the first switching device and the first transmission unit, the matching of the second transmission unit and the second switching device and the matching of the first switching device and the second switching device, so that the size of the non-vacuum fluid transmission device in the length direction is not too large, and an included angle is formed between the first transmission unit and the second transmission unit, thereby being more beneficial to puncture and positioning; in addition, the first transmission unit and the second transmission unit are both in a non-vacuum structure, so that the flexibility of the transmission device can be improved.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings.

FIG. 1 is an axial cross-sectional view of a non-vacuum fluid transfer device in an embodiment of the present invention as installed for use;

FIG. 2 is an axial cross-sectional view of a non-vacuum fluid transfer device in an embodiment of the present invention;

FIG. 3 is a cross-sectional view of the non-vacuum fluid transfer device shown in FIG. 2 with parts of the handle assembly and the outer sleeve hidden to more clearly show the first and second adapters;

FIG. 4 is an axial cross-sectional view of the first adapter shown in FIG. 3;

FIG. 5 is an axial cross-sectional view of the second adapter shown in FIG. 3;

FIG. 6 is a view of the non-vacuum fluid transfer device of FIG. 2 from a radial perspective;

FIG. 7 is an axial cross-sectional view of an ablation needle coupled to a non-vacuum fluid delivery device in an embodiment of the present invention;

FIG. 8 is an axial cross-sectional view of the intake and return flow assembly of FIG. 7;

FIG. 9 is an enlarged view of FIG. 8 at N;

FIG. 10 is an enlarged view of FIG. 8 at P;

FIG. 11 is an axial cross-sectional view of the energy exchanging tube of FIG. 8;

FIG. 12 is an axial cross-sectional view of the shift collar of FIG. 8;

FIG. 13 is a schematic view of the adaptor sleeve of FIG. 8 in cooperation with the inlet core tube and the inner tube;

FIG. 14 is an axial cross-sectional view of the sealed vacuum jacket of FIG. 7;

FIG. 15 is a side view of the sealed vacuum enclosure of FIG. 7;

FIG. 16 is an enlarged view of one embodiment of the right side portion of the ablation needle of the present invention;

FIG. 17 is an enlarged view of another embodiment of the right side portion of the ablation needle of the present invention;

FIG. 18 is an enlarged view of FIG. 1 at M;

FIG. 19 is an enlarged view of FIG. 1 at Q;

FIG. 20 is a radial cross-sectional view of the second quick connect device of the ablation needle system of the present invention after connection to the first quick connect device;

FIG. 21 is an axial cross-sectional view of the first quick connect apparatus shown in FIG. 2;

FIG. 22 is an axial cross-sectional view of another embodiment of the ablation needle system of the invention with the second quick connect means connected to the first quick connect means;

FIG. 23 is an enlarged view of an upper portion of the ablation needle system shown in FIG. 22;

FIG. 24 is an axial cross-sectional view of the second quick connect apparatus shown in FIG. 22;

FIG. 25 is an axial cross-sectional view of the resilient tip bead illustrated in FIG. 23;

FIG. 26 is an axial cross-sectional view of the first quick connect device and transition piece after attachment in accordance with an embodiment of the present invention.

Reference numerals:

100-a first transmission unit;

110-a first inlet flow pipe; 120-a first return pipe; 130-insulation part; 140-a flexible reinforcement; 150-outer sleeve;

200-a second transmission unit;

210-a second inflow pipe; 220-a second return conduit; 230-a first coupling means; 240-a second switching device; 260-first quick-connect means; 270-a handle assembly; 211-mating end face; 221-through end face;

231-an adapter; 232-first mating hole; 233-a second mating hole; 234-upper step surface; 235-a second tapered outer wall; 237-a first tapered outer wall; 236-a positioning table;

241-a three-way adapter; 242-third mating hole; 243-fourth mating hole; 244-lower step surface;

261-a mating groove; 2611-an inclined wall; 262-a backflow hole; 263-wedge end face;

300-an ablation needle; 310-a flow-in and flow-back assembly;

311-a needle tip; 312-an energy exchange tube; 313-an inner tube; 314-an outer tube; 315-a conversion sleeve; 316-a buffer device; 317-inflow core tube; 318-connecting pipe;

301-a second quick-connect means; 302-sealing the vacuum jacket; 303-a protective sheath;

304-a resiliently movable sleeve; 3041-an elastic member; 3042-a top block;

305-a getter; 306-a seal;

307-resilient snap elements; 3071-top bead; 3072-a spring; 3073-a plunger;

308-connecting sleeve; 3081-connecting holes; 3082-sealing groove; 3083-a recessed portion;

3011-a first flange; 3012-a ball bearing; 3013-a second flange; 3014-ball holes;

3021-a first cavity; 3022-second lumen; 3023-sealing the interface; 3024-entering reflux and sealing holes; 3025-mating table;

3031-mating grooves;

3121-a thermally insulating cavity; 3122-a heat exchange chamber;

3151-sealing the chamber; 3152-a guide tube; 3153-connecting bosses; 3154-grooves; 3155-drainage holes;

31-first segment return path; 32-a second stage return path; 33-third stage return path; 34-fourth stage return path.

Detailed Description

The invention will be further explained with reference to the drawings.

According to a first aspect of the present invention, there is provided a non-vacuum fluid delivery device, more particularly for use with an ablation needle system, as shown in fig. 1, which can deliver fluid to an ablation needle 300 in the ablation needle system or receive fluid returned from the ablation needle 300. The fluid described herein may be a working fluid suitable for cold and hot ablation therapy, such as liquid nitrogen and absolute ethyl alcohol.

As shown in fig. 2 and 3, the non-vacuum fluid transfer device of the present invention includes a first transfer unit 100 and a second transfer unit 200 communicating with each other, and the first transfer unit 100 is used to transfer a fluid into the second transfer unit 200 or to receive a fluid returned from the second transfer unit 200.

The first transmission unit 100 comprises a first inlet pipe 110, a first return pipe 120 and an outer sleeve 150, wherein the first inlet pipe 110 and the first return pipe 120 are arranged in parallel inside the outer sleeve 150, so that the first transmission unit 100 forms a whole, thereby being beneficial to the miniaturization and the light weight of the device.

The second transfer unit 200 includes a second inflow pipe 210 and a second return pipe 220. The second inlet pipe 210 is provided with a first adapter 230, the second inlet pipe 210 is communicated with the first inlet pipe 110 through the first adapter 230, and the flow direction of the fluid in the first inlet pipe 110 is redirected through the first adapter 230 to flow into the second inlet pipe 210. The second return pipe 220 is sleeved outside the second inlet pipe 210, a second adapter 240 is disposed on the second return pipe 220, the second return pipe 220 is communicated with the first return pipe 120 through the second adapter 240, and the flow direction of the fluid in the second return pipe 220 is redirected through the second adapter 240 to return to the first return pipe 120.

Wherein, the first adapter 230 is connected with the second adapter 240 by fitting.

The first inlet pipe 110 and the first return pipe 120 may extend along the X direction shown in fig. 2, and the second inlet pipe 210 and the second return pipe 220 may extend along the Y direction shown in fig. 2, that is, the first inlet pipe 110 and the second inlet pipe 210 are substantially perpendicular, and the first return pipe 120 and the second return pipe 220 are substantially perpendicular, so that the volume of the non-vacuum fluid transfer device can be reduced, and the space can be maximally utilized. In addition, the second inlet line 210 and the second return line 220 of the non-vacuum fluid transfer device are redirected relative to the first inlet line 110 and the first return line 120, thereby facilitating needle positioning and the like when used in conjunction with the ablation needle 300, and also effectively isolating the inflow and return flow paths, such that the inflow and return flow paths form independent flow paths.

With reference to fig. 2, in conjunction with fig. 3 and 4, the first adapter 230 includes an adapter 231, and the adapter 231 is used to connect the first inlet pipe 110 and the second inlet pipe 210 in a fluid communication manner, so that the fluid flowing along the X direction in the first inlet pipe 110 can flow into the second inlet pipe 210 and flow along the Y direction. As shown in fig. 4, the adapter 231 is provided with a first fitting hole 232 and a second fitting hole 233 that form fluid communication. Wherein the first fitting hole 232 extends in a first direction (X direction) for receiving the first inflow pipe 110; the second fitting hole 233 is configured as a stepped hole extending in a second direction (Y direction) at an angle (e.g., 90 ° or slightly larger than 90 °) to the first direction (X direction), and the second fitting hole 233 is used to receive the second inflow pipe 210.

Referring to fig. 3 and 4, the second inflow pipe 210 has a mating end surface 211, and the mating end surface 211 abuts against an upper step surface 234 in the second mating hole 233, so as to indicate that the second inflow pipe 210 and the adapter 231 are installed in place.

The adapter 231 is configured in a generally L-shaped configuration, and as shown in fig. 4, the portion thereof extending in the X direction may be configured with a second tapered outer wall 235 to facilitate machining and weight reduction. The portion of the adapter 231 extending in the Y-direction may be configured to include a locating land 236 and a first tapered outer wall 237 extending over the locating land 236, wherein the locating land 236 may indicate that the adapter 231 is in place with a three-way adapter 241 as described below, and the first tapered outer wall 237 facilitates guiding the insertion of the adapter 231 into the three-way adapter 241 and provides a weight reduction effect.

Referring to fig. 3 and 5, the second adapter 240 includes a three-way adapter 241, the three-way adapter 241 is used for sealing and connecting the adapter 231 and making the first return pipe 120 and the second return pipe 220 form a fluid communication, so that the fluid flowing in the Y direction in the second return pipe 220 can flow back to the first return pipe 120 and flow in the X direction.

Specifically, a third fitting hole 242 and a fourth fitting hole 243 are provided in the three-way joint 241. The third mating hole 242 extends in the X direction for receiving the first return pipe 120. The fourth fitting hole 243 is configured as a stepped hole penetrating the three-way joint 241 in the Y direction, the fourth fitting hole 243 is used for accommodating the second return pipe 220, and the penetrating end surface 221 of the second return pipe 220 abuts against the lower stepped surface 244 in the fourth fitting hole 243, thereby indicating that the second return pipe 220 and the three-way joint 241 are installed in place.

Wherein the third mating hole 242, the fourth mating hole 243, the second mating hole 233 and the first mating hole 232 are in fluid communication.

As described above, the end (upper end) of the three-way adapter 241 abuts the locating land 236 of the adapter 231, indicating that both are in place; at the same time, the fourth mating hole 243 penetrates the three-way joint 241 in the Y direction, and the first tapered outer wall 237 of the joint 231 is accommodated on the upper side of the third mating hole 243, so that the three-way joint 241 and the joint 231 form a sealing connection on the upper side of the fourth mating hole 243. Therefore, during the backflow (please refer to fig. 3 and fig. 6), the fluid flows in the channel formed by the inner wall of the second return pipe 220 and the outer wall of the second inflow pipe 210, and flows into the fourth fitting hole 243, and due to the sealing effect of the adapter 231 and the three-way adapter 241, the fluid only flows into the third fitting hole 242 and enters the first return pipe 120, but not into the first fitting hole 232 of the adapter 231.

Therefore, through the matching and connecting effects of the three-way adapter 241 and the adapter 231, the split first inlet pipe 110 and the first return pipe 120 arranged side by side in the first transmission unit 100 can be connected with the second inlet pipe 210 and the second return pipe 220 sleeved with each other in the second transmission unit 200 in a one-to-one correspondence manner, so that both the inlet flow and the return flow can change directions, the size of the non-vacuum fluid transmission device in the length direction is reduced, and the puncturing and positioning are facilitated due to the configuration.

With continued reference to fig. 2, the first transmission unit 100 further includes a heat insulation portion 130 and a flexible reinforcing portion 140. The heat insulation part 130 is located in the outer sleeve 150 and covers the outer walls of the first inlet pipe 110 and the first return pipe 120. The non-vacuum fluid transfer device of the present invention does not adopt a vacuum heat insulation manner, but provides a heat insulation portion 130 to maintain the first transfer unit 100 at a normal temperature. More specifically, the thermal insulation 130 may be a thermal insulation material, such as an aerogel material, in the outer casing 150 and coated on the outer walls of the first inlet pipe 110 and the first return pipe 120.

The flexible reinforcement part 140 is disposed between the heat insulating part 130 and an inner wall of the outer sleeve 150 for supporting the first inflow pipe 110 and the first return pipe 120. As shown in fig. 2, the flexibility reinforcement portion 140 extends in a spiral manner in the axial direction of the outer sleeve 150 so as to provide support in the entire axial direction.

With continued reference to fig. 2, the second transmission unit 200 further includes a handle assembly 270 and a first quick-connect device 260. The handle assembly 270 is sealingly connected to the first quick-connect means 260 and the outer sleeve 150, respectively. The handle assembly 270 houses the first adaptor device 230 and the second adaptor device 240.

As shown in fig. 2, the wall thickness of the handle assembly 270 is set to be thin for weight reduction, so that the spaces between the inner wall thereof and the first and

second adapters

230 and 240 are large, and the spaces may be filled with aerogel material to perform a stabilizing function. The first quick connector 260 accommodates the second inlet pipe 210 and the second return pipe 220, and the space between the inner wall of the first quick connector 260 and the outer wall of the second return pipe 220 can be filled with aerogel material to achieve the stabilizing effect.

The first quick connector 260 forms a quick-plug arrangement with the second quick connector 301 of the ablation needle 300 to facilitate removal and installation of the non-vacuum fluid delivery device with the ablation needle 300.

As shown in fig. 2, the outer sleeve 150 may be a flexible hose, and the space between the thermal insulation part 130 and the flexible reinforcement part 140 may be filled with aerogel material. The space between the handle assembly 270 and the first and

second adapters

230 and 240 is also filled with aerogel material, so that the angle between the first and

second transfer units

100 and 200 can be slightly increased or decreased, for example, the first transfer unit 100 is slightly inclined upwards or downwards, thereby facilitating the adjustment by the operator.

According to a second aspect of the present invention, as shown in fig. 1, the present invention provides an ablation needle system comprising the non-vacuum fluid delivery device described above, further comprising an ablation needle 300, the ablation needle 300 being detachably connected to the second delivery unit 200.

As shown in fig. 7, the ablation needle 300 includes a sealed vacuum jacket 302 and a feedthrough assembly 310 that extends through and is in vacuum communication with the sealed vacuum jacket 302. The ablation needle 300 extends generally in the Y-direction so that, when connected to the non-vacuum fluid transfer device, an ablation needle system having a corner structure is formed. The part of the ablation needle system in the Y direction performs puncture operation, and the part of the ablation needle system in the X direction can be held by an operator, so that the ablation needle system with the corner structure is more convenient to operate.

As shown in fig. 8, the inlet/return pipe assembly 310 includes an inlet core tube 317 in fluid communication with the second inlet pipe 210 and an inner pipe 313 fitted around the inlet core tube 317, the inner pipe 313 being in fluid communication with the second return pipe 220. The cold fluid and the hot fluid in the inlet and return assembly 310 flow in the inlet core tube 317, and in order to improve the operation safety and ensure the treatment temperature of the working medium, an outer tube 314 is sleeved outside the inner tube 313, and a vacuum space is formed between the inner tube and the outer tube.

In order to obtain an ablation needle as thin as possible (e.g., a 1.7mm ultra-thin ablation needle, where 1.7mm refers to the outer diameter of the inflow/outflow component 310), a thin-walled tube is generally selected and a certain vacuum space is sacrificed on the premise of satisfying the therapeutic effect. This results in that the temperature of the inner tube 313 becomes very low or very high due to the flow of cold or hot fluid during the treatment, while the temperature of the outer tube 314 is always kept at normal temperature due to the vacuum space, so that the temperature difference between the outer tube 314 and the inner tube 313 is large, which causes the inner tube 313 to be subjected to the stress of thermal expansion and contraction. Because the two ends of the backflow inlet assembly 310 are fixed by welding, the stress caused by thermal expansion and cold contraction can cause the inner pipe 313 and the connecting end pipeline thereof to be pulled or pressed, and the acting force can cause the inner pipe 313 to be deformed, so that the welding seam is subjected to certain stress.

Thus, to avoid weld failure due to stress on the weld, at least a portion of the inner tube 313 is provided with a damping device 316, as shown in fig. 8 and 9. By providing the buffer 316 capable of withstanding a certain amount of tensile and compressive deformation, stress due to thermal expansion and contraction can be effectively absorbed.

Preferably, the damping device 316 is a bellows, such as a metal bellows, a helical bellows, or the like.

The outer wall of the inner tube 313 and the inner wall of the outer tube 314 are both attached with a film getter. Specifically, a layer of extremely thin film getter can be coated on the outer wall of the inner tube 313 and the inner wall of the outer tube 314 respectively in a vacuum coating mode, the thin film getter can be activated in the process of degassing materials in the vacuum chamber, and after degassing is completed, vacuum sealing operation can be performed.

Referring to fig. 8 and 10, the ablation needle 300 further includes a needle tip 311 and an energy exchange tube 312, which are integrally or separately arranged, and fig. 10 shows that the needle tip 311 and the energy exchange tube 312 are separately structured and are hermetically connected by welding or the like.

The energy exchanging tube 312 is connected to the outer tube 314 in a direct or indirect manner. The energy exchanging tube 312 shown in fig. 10 is connected to the outer tube 314 in an indirect manner, i.e. both are connected by a connecting tube 318. After connection, the needle tip 311, the energy exchanging tube 312, the connecting tube 318 and the outer tube 314 have a uniform outer diameter.

As shown in fig. 10 and 11, the energy exchange tube 312 includes an insulated cavity 3121 and a heat exchange cavity 3122 that form a physical separation along an axial direction thereof. Therein, the insulated cavity 3121 may be filled with an insulating material, such as aerogel material (particles). In addition, a film getter or a normal temperature getter and the like can be attached to the inner wall of the heat insulation cavity 3121. In other words, the heat insulation material is filled in the heat insulation cavity 3121, so that only the portion of the heat exchange cavity 3122 in the energy exchange tube 312 can exchange heat, and the portion of the heat insulation cavity 3121 does not exchange heat, so that the energy exchange tube 312 can meet the clinical special requirements.

As shown in fig. 10, the influent core pipe 317 extends into the heat exchange chamber 3122, and the axes of the heat exchange chamber 3122 and the influent core pipe 317 are not collinear due to the existence of the adiabatic chamber 3121, so the influent core pipe 317 needs to be slightly bent to extend into the heat exchange chamber 3122.

The heat exchange cavity 3122 is in fluid communication with the inlet core tube 317 and the inner tube 313, respectively, such that the fluid flowing out of the inlet core tube 317 is folded back in the heat exchange cavity 3122 and flows back between the inlet core tube 317 and the inner tube 313. The inlet core tube 317 is in fluid communication with the second inlet tube 210 and the first inlet tube 110, i.e. the fluid flows through the second inlet tube 210 from the first inlet tube 110 and then enters the inlet core tube 317, and the part of the inlet core tube 317 located in the heat exchange cavity 3122 can exchange heat.

The fluid after the heat exchange is turned back in the heat exchange cavity 3122 and flows back to between the core tube 317 and the inner tube 313, and a return path is formed between the inner wall of the inner tube 313 and the outer wall of the core tube 317, and the fluid flows back from the return path to the second return pipe 220 and the first return pipe 120 in sequence.

Alternatively, as shown in fig. 10, the end of the core inlet pipe 317 is an open end so that the fluid therein can flow out from the end to the heat exchange cavity 3122, and the corresponding end of the heat exchange cavity 3122 is a closed end so that the fluid in the heat exchange cavity 3122 can turn back therein.

Optionally, one or more shaping holes (not shown) may be disposed in the sidewall of the inlet core tube 317, and the fluid may flow out of the shaping holes into the heat exchange cavity 3122.

Alternatively, the inlet core tube 317 may be configured to have an open end at its end and one or more forming holes (not shown) formed in its sidewall.

Referring to fig. 7, 8 and 12, ablation needle 300 further includes a transition piece 315 and a second quick connect device 301 sealingly connected to transition piece 315. As shown in fig. 12, the transfer sleeve 315 includes a sealing chamber 3151 and a guide tube 3152 penetrating the sealing chamber 3151, and the core tube 317 penetrates the guide tube 3152. The second inlet flow tube 210 extends through the second quick connect fitting 301 and into the sealed chamber 3151 of the transition piece 315.

Second inlet manifold 210 receives a portion of inlet manifold 3152 and, therefore, a portion of inlet manifold tube 317 to form an inlet flow path in fluid communication with inlet manifold tube 317.

The second inlet pipe 210 and the second return pipe 220 extend through the second quick connect fitting 301 and into the sealed chamber 3151 of the transition piece 315. More specifically, referring to fig. 12 and 16, the inlet core tube 317 penetrates the guide pipe 3152 and is hermetically connected to the guide pipe 3152 at an end side thereof, and the inlet core tube 317 is extended into the second inlet pipe 210 together with the guide pipe 3152, so that the inlet core tube 317 and the second inlet pipe 210 are in fluid communication, and thus, the first inlet pipe 110, the second inlet pipe 210, and the inlet core tube 317 form an inlet passage for flowing a fluid to be heat-exchanged.

As shown in fig. 12 and 13, the end of the transfer sleeve 315 opposite the sealing chamber 3151 is also provided with a groove 3154 in fluid communication with the sealing chamber 3151, specifically, the groove 3154 is in fluid communication with the sealing chamber 3151 through a drainage aperture 3155. As shown in fig. 12, a drainage hole 3155 extending toward the sealing chamber 3151 is provided at the bottom of the groove 3154; a drainage aperture 3155 is located in the circumferential direction of guide tube 3152, the drainage aperture 3155 being in fluid communication with the groove 3154 and the sealing chamber 3151, respectively. And in the axial direction (Y-axis direction), the sum of the depth of the groove 3154 and the depth of the drainage hole 3155 is the axial wall thickness of the sealing chamber 3151.

The inner tube 313 is arranged in this groove 3154 and the end of the inner tube 313 abuts against the inner wall of the groove 3154, i.e. the inner tube 313 ends in this groove 3154. Thus, the groove 3154, the drainage hole 3155, and the sealing chamber 3151 form a backflow path. Further, referring to fig. 2, 18 and 21, the first quick-connect means 260 has a tapered end surface 263, the tapered end surface 263 facilitating guiding the first quick-connect means 260 for insertion into the sealed chamber 3151 of the shift collar 315. The wedge-shaped end surface 263 is provided with a return bore 262 extending in the axial direction of the first quick-connection means 260, and when the first quick-connection means 260 is inserted into the sealing chamber 3151 and sealingly connected to the sealing chamber 3151, the wedge-shaped end surface 263 of the first quick-connection means 260 is at a distance from the inner bottom wall of the sealing chamber 3151, in other words, the first quick-connection means 260 does not fully occupy the sealing chamber 3151, so that fluid flowing into the sealing chamber 3151 can flow into the return bore 262, i.e. the return bore 262 is in fluid communication with the sealing chamber 3151. Further, the return hole 262 is in fluid communication with a return path formed by an inner wall of the second return pipe 220 and an outer wall of the second inlet pipe 210.

That is, when the end of the inner tube 313 abuts against the inner wall of the groove 3154, a backflow path is formed between the inner wall of the inner tube 313 and the outer wall of the core barrel 317 as a first-stage backflow path; the backflow path formed by the groove 3154, the drainage hole 3155 and the sealing chamber 3151 is a second-segment backflow path; the backflow hole 262, the inner wall of the second backflow pipe 220, and the outer wall of the second inflow pipe 210 form a third-stage backflow path, and the first backflow pipe 120 forms a fourth-stage backflow path, which are in fluid communication to form a backflow passage together. The return path is used for flowing the heat-exchanged fluid, and the fluid can be returned to the end of the first return pipe 120 for further processing, such as recycling or discharging.

Referring to fig. 12 and 16, the distance a between the inner wall of the sealing chamber 3151 and the sealing member 306 in the second quick connector 301 in the axial direction (i.e., the length in the Y direction) is related to the low temperature resistance of the sealing member 306. More specifically, the distance a (i.e., the length in the Y direction) between the inner wall of the seal chamber 3151 and the seal 306 in the second quick-connection device 301 in the axial direction thereof is inversely related to the degree of low-temperature resistance of the seal 306. For example, the higher the degree of low temperature resistance of the seal 306, the smaller the distance A. Thus, if the seal 306 is made of a material with better low temperature resistance, such as PTFE (polytetrafluoroethylene), the distance a can be relatively shortened; if the sealing member 306 is made of a common rubber material, the distance a can be relatively increased to satisfy the requirement of sealing reliability.

In addition, the sealing member 306 may be made of nitrile rubber, fluoro rubber, silicone rubber, or polyurethane, and the distance a may be adjusted according to the characteristics of these different materials.

Wherein the seal 306 is used to form a seal between the second quick connector 301 and the first quick connector 260 of the non-vacuum fluid transfer device. The alternative to the seal 306 being located on the inner wall of the second quick coupling device 301 is therefore that the seal 306 is located on the outer wall of the first quick coupling device 260, again ensuring a seal between the two.

With continuing reference to fig. 7 and with reference to fig. 14, 15 and 16, the ablation needle 300 further includes a sealing vacuum jacket 302, wherein a first cavity 3021 and a second cavity 3022 are respectively disposed on two sides of the sealing vacuum jacket 302 for weight reduction, a backflow inlet and sealing hole 3024 is disposed in a central portion of a partition between the first cavity 3021 and the second cavity 3022, and the backflow inlet assembly 310 penetrates through the backflow inlet and sealing hole 3024. A portion of the space in the reflow and sealing hole 3024 is occupied by the reflow element 310, and another portion of the space is used for the sealing port for the vacuum operation. In other words, the inlet/return flow and seal bore 3024 is used to accommodate both the inlet/return flow assembly 310 and the sealing port for the evacuation operation.

In addition to sealing through the inflow/backflow and sealing hole 3024, at least 4 sealing ports 3023 circumferentially distributed along the inflow/backflow and sealing hole 3024 on the partition board can perform a vacuum pumping operation on the ablation needle 300 through the sealing ports 3023, thereby ensuring a desired vacuum environment inside the ablation needle 300.

As shown in fig. 9, 14 and 16, the outer tube 314 terminates in a second chamber 3022, and a getter 305 is disposed in the second chamber 3022 where the outer tube 314 terminates for maintaining a vacuum environment within the first chamber 3021. Preferably, the getter 305 is an ambient temperature getter, such as PdO + molecular sieve, activated carbon, or heat insulating material, which does not require high temperature activation, but only needs degassing, and thus has simple process and easy operation.

As shown in fig. 12, 14 and 16, a protective sleeve 303 is hermetically connected to one side of the sealed vacuum enclosure 302. Specifically, the outer wall of the first cavity 3021 is provided with a matching platform 3025, which is positioned with a matching groove 3031 on the protection sleeve 303 to connect the sealing vacuum jacket 302 and the protection sleeve 303 in a sealing manner, such as welding. The other side of the protective sleeve 303 mates with the in-and-out flow assembly 310, specifically the outer tube 314. The inflow/outflow component 310 sequentially passes through the protective sheath 303 and the sealing vacuum jacket 302, and performs vacuum pumping and sealing operations through the sealing ports to ensure a desired vacuum environment inside the ablation needle 300.

The protective sleeve 303 may provide some protection to the backflow assembly 310 (specifically, the outer tube 314). In addition, the protective sleeve 303 is integrally constructed into a cone-shaped structure, and has the characteristics of attractive appearance and lightness.

The other side of the sealing vacuum jacket 302 is hermetically connected with the conversion sleeve 315. Specifically, a connecting boss 3153 (as shown in fig. 12) is disposed on an outer wall of the transition sleeve 315, a side end of the sealing vacuum outer sleeve 302 abuts against one side of the connecting boss 3153, and the other side of the second quick connecting device 301 abuts against the other side of the connecting boss 3153 to ensure that the sealing vacuum outer sleeve 302, the transition sleeve 315 and the second quick connecting device 301 are mounted in place, so as to perform a sealing connection. As shown in FIG. 10, the sealed vacuum jacket 302, the transition piece 315 and the second quick connect device 301 have a uniform outer diameter after being sealed.

The second quick-connection device 301 and the first quick-connection device 260 can be quickly assembled and disassembled through a snap connection.

In one embodiment, as in the embodiment shown in fig. 1, 2, 16, 17, 19 and 20, the second quick connector 301 is connected to the first quick connector 260 by a sliding snap fit.

Optionally, referring to fig. 1 and 16, the second quick connect device 301 includes a first flange 3011, and the diameter of the first flange 3011 is slightly larger than the diameter of the sealing vacuum jacket 302 for easy placement of the sealing member 306.

Optionally, referring to fig. 1 and 17, the second quick-connect means 301 includes a second flange 3013 having a diameter substantially the same as the diameter of the sealing vacuum jacket 302, i.e., the second quick-connect means 301, the sealing vacuum jacket 302 and the transition sleeve 315 have a uniform outer diameter, thereby maintaining the ablation needle 300 with a uniform overall profile.

It will therefore be further appreciated that the second quick connect device 301 further includes a flexible traveling sleeve 304 for quick connection, and the wall thickness of the flexible traveling sleeve 304 can be made thinner, as shown in fig. 17, the wall thickness of the flexible traveling sleeve 304 is significantly smaller than that of the flexible traveling sleeve 304 shown in fig. 16, so as to facilitate the overall contour of the ablation needle 300 to be uniform.

Referring to fig. 1, fig. 2, fig. 16, fig. 19, fig. 20 and fig. 21, the elastic moving sleeve 304 is sleeved outside the first flange 3011 (or the second flange 3013 shown in fig. 17), and a space for accommodating the elastic member 3041 is formed between the two flanges. One end of the elastic member 3041 abuts on the protruding end portion of the first flange 3011, and the other end of the elastic member 3041 abuts on the top block 3042 of the elastic moving sleeve 304. Therefore, when the elastic moving sleeve 304 moves along the Y-axis negative direction, the elastic member 3041 is compressed (at this time, the second quick connector 301 and the first quick connector 260 can be unlocked), and conversely, the elastic moving sleeve 304 moves along the Y-axis positive direction under the restoring force of the elastic member 3041 (at this time, the second quick connector 301 and the first quick connector 260 can be locked).

The first flange 3011 is provided with a ball hole 3014, and the ball hole 3014 is configured as a tapered hole with a diameter gradually decreasing along a direction from an outer wall to an inner wall of the first flange 3011. Ball holes 3014 are provided with balls 3012 (see fig. 19). The balls 3012 are in ball holes 3014, and the top block 3042 of the elastic movement sleeve 304 is disposed at a position corresponding to the ball holes 3014, so that the balls 3012 are exposed from a part of the inner side of the ball holes 3014 (as shown in fig. 20). Since the ball hole 3014 is a tapered hole, the ball 3012 can freely roll in the ball hole 3014 without coming out.

The outer wall of the first quick connector 260 is provided with a mating groove 261 (see fig. 2 and 21), and the mating groove 261 has an inclined wall 2611 (as shown in fig. 21), so that the mating groove 261 has a structure with a large outer side and a small inner side. When the second quick connector 301 is connected to the first quick connector 260, the portion of the ball 3012 exposed out of the ball hole 3014 enters the engagement groove 261. In other words, the balls 3012 are caught in the ball holes 3014 and the fitting grooves 261.

Further, when the elastic moving sleeve 304 moves in the Y-axis negative direction, the top block 3042 of the elastic moving sleeve 304 and the ball hole 3014 are offset from each other, so that the ball 3012 can be pushed into the ball hole 3014 by the inclined wall 2611 of the matching groove 261, and the second quick connector 301 and the first quick connector 260 are unlocked and can be separated from each other. The second quick connect device 301 is unlocked from the first quick connect device 260 so the non-vacuum fluid transfer device can be unlocked from the ablation needle 300.

On the contrary, when the elastic moving sleeve 304 moves in the positive Y-axis direction under the restoring force of the elastic member 3041, the top block 3042 of the elastic moving sleeve 304 corresponds to the ball hole 3014, so that the ball 3012 is exposed from the inner side of the ball hole 3014 and enters the matching groove 261, thereby locking the second quick connector 301 with the first quick connector 260, and thus the non-vacuum fluid delivery device can be locked with the ablation needle 300. Thereby allowing the second quick connect means 301 to be quickly assembled with the first quick connect means 260.

It is to be understood that the balls 3012 may be provided in plural in the circumferential direction of the first flange 3011. As shown in fig. 19 and 20, 4 balls 3012 are arranged at equal intervals in the circumferential direction of the first flange 3011.

In another embodiment, as shown in fig. 22, 23, 24 and 25, the second quick coupling means 301 is connected to the first quick coupling means 260 by a sliding elastic snap. In this embodiment, the connection manner of the second quick connection device 301 and the first quick connection device 260 will be mainly described, and the rest of the components can refer to other embodiments described herein.

As shown in fig. 22 and 23, the second quick coupling device 301 includes a connection sleeve 308 and a resilient snap member 307 provided on the connection sleeve 308. As shown in fig. 24, the connection sleeve 308 is provided with a connection hole 3081, and the elastic snap-fit member 307 is disposed in the connection hole 3081, and as shown in fig. 24 and 25, the elastic snap-fit member 307 includes a plunger 3073, a spring 3072, and a top ball 3071. The plunger 3073 may be fixedly coupled to the coupling hole 3081 by means of a screw coupling.

The plunger 3073 has a tapered bore provided therein, and a top ball 3071 and a spring 3072 are provided in the tapered bore. A portion of the knock bead 3071 is exposed outside the tapered hole of the plunger 3073 by the urging force of the spring 3072. Since the inside diameter of the tapered hole is small, the tip bead 3071 can freely rotate therein without coming out.

The first quick coupling device 260 is similar to the previous embodiment in that a fitting groove 261 is provided, and after the second quick coupling device 301 is coupled to the first quick coupling device 260, the portion of the top ball 3071 exposed outside the tapered hole of the plunger 3073 is caught in the fitting groove 261, i.e., the top ball 3071 is caught in the plunger 3073 and the fitting groove 261.

When the first quick connector 260 is pulled in the positive Y-axis direction, the engagement groove 261 is misaligned with the top bead 3071, the top bead 3071 is pushed by the inclined wall 2061 of the engagement groove 261, thereby compressing the spring 3072, and the top bead 3071 retracts into the tapered bore of the plunger 3073, thereby unlocking the second quick connector 301 from the first quick connector 260 and separating the non-vacuum fluid delivery device from the ablation needle 300.

Conversely, when the first quick connector 260 is pushed in the negative Y-axis direction to be inserted into the second quick connector 301, the engagement groove 261 corresponds to the top ball 3071, and the top ball 3071 is pushed by the spring 3072 to be engaged in the engagement groove 261 by the tapered hole of the plunger 3073, so that the second quick connector 301 is locked with the first quick connector 260, and the non-vacuum fluid delivery device can be connected with the ablation needle 300.

In addition, as shown in fig. 24, a sealing groove 3082 is further provided in the connecting sleeve 308, and the sealing groove 3082 is used for accommodating the sealing member 306, so that a seal is formed between the second quick-connection device 301 and the first quick-connection device 260.

The connection sleeve 308 is further provided with a concave portion 3083, and the concave portion 3083 is convenient for holding during operation.

On the basis of fig. 22, 23, 24 and 25, another snap connection between the second quick connection means 301 and the first quick connection means 260, namely an elastic snap connection, is also conceivable. For example, the resilient latching element 307 may be configured as a push switch, which, when a force is applied to the push switch, disengages the resilient latching element 307 from the mating groove 261, so that the second quick-connect device 301 can be unlocked from the first quick-connect device 260.

Ablation needles 300 have a variety of diameters, with different diameters of ablation needles 300 providing different resistance to assembly than non-vacuum fluid transfer devices. Generally, ablation needles 300 with larger diameters have less resistance to assembly because the diameter of the flow tubes for the hot and cold fluids is larger; while the ablation needle 300 with a smaller diameter has a greater resistance to assembly due to the smaller diameter of the cold and hot fluid flow tubes. In order to enable the non-vacuum fluid transfer device to match the ablation needles 300 with different diameters, the cooling speed and performance can be ensured by adjusting the air-tight fit clearance of the second transfer unit 200 of the non-vacuum fluid transfer device and the ablation needles 300.

Since the flow resistance is consistent for ablation needles 300 of the same diameter, adjustments are made for ablation needles 300 of different diameters.

Please refer to fig. 1, 12 and 17, the non-vacuum fluid transfer device is matched with the ablation needle 300, so as to match the resistance of different ablation needles by the matching gap. The distance L between the end of the cartridge core 317 and the inner wall of the sealed chamber 3151 of the shift collar 315 is a fixed value as shown in fig. 12 and 17. The depth of the inlet core tube 317 (and guide tube 3152) extending into the second inlet flow tube 210 (or what can be considered as extending into the second return tube 220) is the fitting length L1.

The flow resistance between the inlet core tube 317 (and the guide tube 3152) and the second inlet pipe 210 is related to the aforementioned fitting length L1 and the fitting clearance between the inlet core tube 317 (and the guide tube 3152) and the second inlet pipe 210. Generally, a fitting resistance greater than the resistance of the forward end of the ablation needle 300 is required to avoid backflow of hot and cold fluids directly through the fitting gap to the second return line 220 of the non-vacuum fluid delivery device and not through the return path of the ablation needle 300. For example, a larger mating length L1 and a larger mating clearance, or a shorter mating length L1 and a smaller mating clearance.

Referring to fig. 1, 3 and 18, the diameter of the inner bore of the non-vacuum fluid transfer device is C1, i.e., the inner diameter of the second inflow pipe 210 (as shown in fig. 3 and 17), which is a fixed value. The inner bore diameter of the ablation needle 300 is C, the outer diameter of the guide tube 3152 (as shown in fig. 12 and 17). Different matching requirements can be met by adjusting the value of C. For example, for a thinner diameter ablation needle 300, a relatively small gap may be selected; for ablation needles 300 with larger diameters, a relatively large gap may be selected.

In addition, by selecting a proper fit clearance, the fluid vaporized in the early stage can directly flow out from the fit clearance, and the fluid (liquid nitrogen) can reach the front end of the ablation needle 300 quickly, so that the cooling speed can be improved. And the vaporized fluid flowing out from the fit clearance can flow out through the second return pipe 220 of the non-vacuum fluid transfer device, so that the pre-cooling effect can be also realized on the second return pipe 220, the later-stage return resistance is reduced, and the cooling speed is further improved.

According to a third aspect of the present invention, the present invention provides a fluid channel, more particularly a fluid channel of an ablation needle system as described above.

The fluid channel of the invention comprises an inlet channel and a return channel; the flow direction of the fluid in the first section of the flow inlet path is redirected to flow into the second section of the flow inlet path; the return passage comprises a third-stage return path 33 and a fourth-stage return path 34, and the flow direction of the fluid in the third-stage return path 33 is redirected to flow into the fourth-stage return path 34; the flow direction of the fluid in the first section of the inflow path is opposite to the flow direction of the fluid in the fourth section of the return path 34, and the flow direction of the fluid in the second section of the inflow path is opposite to the flow direction of the fluid in the third section of the return path 33.

In one embodiment, the inflow passageway further comprises a third inflow path, wherein the first, second and third inflow paths are defined by the first delivery unit 100, the second delivery unit 200, the ablation needle 300, the first adaptor device 230 and the second adaptor device 240 as described above.

Specifically, the first transfer unit 100 includes a first inflow tube 110, the second transfer unit 200 includes a second inflow tube 210, and the ablation needle 300 includes an inflow core tube 317. The inflow passage comprises a first section of inflow path, a second section of inflow path and a third section of inflow path.

Wherein, a first section of the inflow path is defined by the first inflow tube 110 of the first transmission unit 100 (the inner cavity/inner wall of the first inflow tube 110), a second section of the inflow path is defined by the second inflow tube 210 of the second transmission unit 200 (the inner cavity/inner wall of the second inflow tube 210), and a third section of the inflow path is defined by the inflow core tube 317 of the ablation needle 300 (the inner cavity/inner wall of the inflow core tube 317).

The axes of the first inlet pipe 110 and the second inlet pipe 210 are substantially perpendicular, and the first inlet pipe 110 is in fluid communication with the second inlet pipe 210 through the first adapter 230.

Referring to fig. 2 in combination with fig. 3 and 4, the first adapter 230 includes an adapter 231, and the adapter 231 is used for enabling the first inlet pipe 110 and the second inlet pipe 210 to form a fluid communication, so that the fluid flowing along the X direction in the first inlet pipe 110 can flow into the second inlet pipe 210 and flow along the Y direction. As shown in fig. 4, the adapter 231 is provided with a first fitting hole 232 and a second fitting hole 233 that form fluid communication. Wherein the first fitting hole 232 extends in a first direction (X direction) for receiving the first inflow pipe 110; the second fitting hole 233 is configured as a stepped hole extending in a second direction (Y direction) at an angle (e.g., 90 °) to the first direction (X direction), and the second fitting hole 233 is for receiving the second inflow pipe 210.

The first and second mating holes 232 and 233 are in fluid communication, such that the first and

second inlet pipes

110 and 210 are in fluid communication.

The second inlet tube 210 is in fluid communication with the inlet core tube 317. In particular, as may be seen in conjunction with fig. 8, 12, 13 and 18, ablation needle 300 further includes a transfer sleeve 315 and a second quick connect device 301 sealingly connected to transfer sleeve 315. As shown in fig. 12, the transfer sleeve 315 includes a sealing chamber 3151 and a guide tube 3152 penetrating the sealing chamber 3151, and the core tube 317 penetrates the guide tube 3152. The second inlet flow tube 210 extends through the second quick connect fitting 301 and into the sealed chamber 3151 of the transition piece 315.

Second inlet manifold 210 receives a portion of inlet manifold 3152 and, therefore, a portion of inlet manifold tube 317 so as to be in fluid communication with inlet manifold tube 317.

The second inlet conduit 210 and the second return conduit 220 extend through the second quick connect fitting 301 and into the sealed chamber 3151 of the transition piece 315. More specifically, referring to fig. 12 and 16, the inflow core tube 317 penetrates the guide tube 3152 and is hermetically connected to the guide tube 3152 at the end side, and the inflow core tube 317 is extended into the second inflow tube 210 together with the guide tube 3152, so that the inflow core tube 317 and the second inflow tube 210 are in fluid communication, and thus the first inflow tube 110, the second inflow tube 210, and the inflow core tube 317 form an inflow passage for flowing a fluid to be heat-exchanged, whereby the fluid can flow in the X-axis negative direction to the Y-axis negative direction shown in fig. 1 up to the needle tip 311 of the ablation needle 300.

Further, the return path further includes a first-stage return path 31 and a second-stage return path 32. The first, second, third and

fourth segments

31, 32, 33, 34 are defined by the first and

second delivery units

100, 200, the ablation needle 300, the first and

second adapters

230, 240 described above.

Ablation needle 300 further includes inflow and backflow assembly 310, and inflow and backflow assembly 310 includes an inflow core tube 317 in fluid communication with second inflow tube 210 and an inner tube 313 sleeved outside inflow core tube 317, and inner tube 313 is in fluid communication with second backflow tube 220. In order to improve the operation safety and ensure the treatment temperature of the working medium, an outer tube 314 is sleeved outside the inner tube 313, and a vacuum space is formed between the outer tube and the inner tube.

The first section of the return flow path 31 is defined by the inner wall of the inner tube 313 and the outer wall of the core barrel 317 (see fig. 8, 9 and 10).

As shown in fig. 12 and 13, the end of the transition sleeve 315 opposite the sealing chamber 3151 is further provided with a groove 3154 in fluid communication with the sealing chamber 3151, specifically, the groove 3154 is in fluid communication with the sealing chamber 3151 through a drainage aperture 3155. As shown in fig. 12, a drainage hole 3155 extending toward the sealing chamber 3151 is provided at the bottom of the groove 3154; a drainage aperture 3155 is located in the circumferential direction of guide tube 3152, the drainage aperture 3155 being in fluid communication with the groove 3154 and the sealing chamber 3151, respectively. And in the axial direction (Y-axis direction), the sum of the depth of the groove 3154 and the depth of the drainage hole 3155 is the axial wall thickness of the sealing chamber 3151.

The inner tube 313 is arranged in this groove 3154 and the end of the inner tube 313 abuts against the inner wall of the groove 3154, i.e. the inner tube 313 ends in this groove 3154. Thus, the groove 3154, the drainage hole 3155, and the sealing chamber 3151 form the second-stage backflow path 32. Referring to fig. 12 and 13, the inner tube 313 extends into the groove 3154, the end of the inner tube 313 abuts against the inner wall of the groove 3154, and the core tube 317 extends into the guide tube 3152, so that the first section of the return flow path 31 defined by the inner wall of the inner tube 313 and the outer wall of the core tube 317 is in fluid communication with the drainage hole 3155, that is, the first section of the return flow path 31 is in fluid communication with the second section of the return flow path 32.

The second delivery unit 200 further comprises a first quick connection 260 and a second quick connection 301 of the ablation needle 300 forming a quick-plug configuration. The first quick-coupling device 260 has a wedge-shaped end surface 263 (see fig. 2, 18 and 21), a return hole 262 is formed in the wedge-shaped end surface 263 and extends in the axial direction of the first quick-coupling device 260, and the third-stage return path 33 is defined by the return hole 262, the inner wall of the second return pipe 220, and the outer wall of the second inflow pipe 210 (see fig. 26).

Referring to fig. 18 and 26, the first quick connector 260 is inserted into the sealing chamber 3151 of the transition sleeve 315 to be connected to the sealing chamber 3151 in a sealing manner, and the return hole 262 at the end of the first quick connector 260 is in fluid communication with the sealing chamber 3151, i.e., the second-stage return path 32 and the third-stage return path 33.

The fourth section 34 is defined by a first return pipe 120 (shown in fig. 2), the first return pipe 120 is communicated with a second return pipe 220 through a second adapter 240, and the flow direction of the fluid in the second return pipe 220 is redirected by the second adapter 240 to return to the first return pipe 120.

Referring to fig. 3 and 5, the second adapter 240 includes a three-way adapter 241, the three-way adapter 241 is used for sealing the adapter 231 and making the first return pipe 120 and the second return pipe 220 form a fluid communication, so that the fluid flowing in the Y direction in the second return pipe 220 can flow back to the first return pipe 120 and flow in the X direction.

Wherein the third matching hole 242, the fourth matching hole 243, the second matching hole 233 and the first matching hole 232 are in fluid communication, so that the second return pipe 220 and the fourth section return path 34 defined by the first return pipe 120 are in fluid communication, that is, the third section return path 33 and the fourth section return path 34 are in fluid communication.

As described above, the end (upper end) of the three-way adapter 241 abuts the locating land 236 of the adapter 231, indicating that both are in place; meanwhile, the fourth fitting hole 243 penetrates through the three-way adapter 241 in the Y direction, and the first tapered outer wall 237 of the adapter 231 is accommodated on the upper side of the fourth fitting hole 243, so that the three-way adapter 241 and the adapter 231 are in sealing connection on the upper side of the fourth fitting hole 243. Therefore, during the backflow (see fig. 3 and 6), the fluid flows in the channel formed by the inner wall of the second backflow pipe 220 and the outer wall of the second inflow pipe 210 and flows into the fourth matching hole 243, and due to the sealing effect of the adapter 231 and the three-way adapter 241, the fluid can only flow into the third matching hole 242 and enter the first backflow pipe 120 and can not enter the first matching hole 232 of the adapter 231.

Therefore, through the matching connection effect of the three-way adapter 241 and the adapter 231, the split first inlet pipe 110 and the first return pipe 120 arranged side by side in the first transmission unit 100 can be respectively connected with the second inlet pipe 210 and the second return pipe 220 sleeved with each other in the second transmission unit 200 in a one-to-one correspondence manner, so that the inlet flow and the return flow can change directions, the size of the non-vacuum fluid transmission device in the length direction is reduced, and the puncturing and positioning are more convenient due to the structure of the non-vacuum fluid transmission device.

The fluid channel of the present invention is based on the non-vacuum delivery device and ablation needle system of the present invention, and thus the particular form of the components involved are not described in detail. The fluid channel of the present invention can incorporate various components and their connections in the non-vacuum delivery device and/or ablation needle system described in any one or more of the embodiments/examples above without any impediments.

It should be noted that the arrows shown in the drawings of the present invention indicate the flow direction of the fluid. Furthermore, the elongated members (e.g., the first delivery unit, the second delivery unit, the ablation needle, etc.) are illustrated in broken outline in the drawings of the present invention, and thus, it will be understood and unambiguous by those skilled in the art from the drawings that the overall construction of the non-vacuum fluid delivery device, the fluid channel, and the ablation needle system as claimed herein is complete.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A fluid channel comprising an inlet flow path and a return flow path;

the flow inlet passage comprises a first section of flow inlet path and a second section of flow inlet path, and the flow direction of the fluid in the first section of flow inlet path is redirected to flow into the second section of flow inlet path;

the backflow passage comprises a third-segment backflow path (33) and a fourth-segment backflow path (34), and the flow direction of the fluid in the third-segment backflow path (33) is redirected to flow into the fourth-segment backflow path (34);

the flow direction of the fluid in the first section of the inflow path is opposite to the flow direction of the fluid in the fourth section of the backflow path (34), and the flow direction of the fluid in the second section of the inflow path is opposite to the flow direction of the fluid in the third section of the backflow path (33).

2. The fluid channel according to claim 1, characterized in that the inflow channel further comprises a third section of inflow path, wherein the first, second and third section of inflow path are defined by a first transfer unit (100), a second transfer unit (200), an ablation needle (300), a first adapter means (230) and a second adapter means (240).

3. The fluid channel according to claim 2, wherein the first transfer unit (100) comprises a first inflow tube (110), the second transfer unit (200) comprises a second inflow tube (210), the ablation needle (300) comprises an inflow core tube (317), a first section of an inflow path is defined by the first inflow tube (110), a second section of an inflow path is defined by the second inflow tube (210), and a third section of an inflow path is defined by the inflow core tube (317);

the second inlet tube (210) is in fluid communication with the inlet core tube (317).

4. A fluid passage according to claim 3, characterized in that the axes of the first inlet pipe (110) and the second inlet pipe (210) are perpendicular, the first inlet pipe (110) being in fluid communication with the second inlet pipe (210) by means of a first adapter means (230); -the fluid in the first inlet pipe (110) is redirected by the first diverting means (230) to flow into the second inlet pipe (210);

the first adapter device (230) comprises an adapter (231), the adapter (231) is used for enabling the first inflow pipe (110) and the second inflow pipe (210) to be in fluid communication, and a first matching hole (232) and a second matching hole (233) which are in fluid communication are arranged in the adapter (231);

wherein the first mating hole (232) extends in a first direction for receiving a first inlet pipe (110); the second matching hole (233) is formed into a step hole extending along a second direction forming an included angle with the first direction, and the second matching hole (233) is used for accommodating the second inflow pipe (210).

5. The fluid channel according to claim 4, wherein the ablation needle (300) further comprises a transition sleeve (315) and a second quick-connect device (301) sealingly connected to the transition sleeve (315), the transition sleeve (315) comprising a sealing chamber (3151) and a guide tube (3152) extending through the sealing chamber (3151), the inlet core tube (317) extending through the guide tube (3152);

the second inlet flow pipe (210) penetrates through the second quick connection device (301) and extends into the sealed chamber (3151); the second inflow pipe (210) accommodates a part of the guide pipe (3152) and a part of the inflow core pipe (317) so as to be in fluid communication with the inflow core pipe (317);

the inlet core tube (317) penetrates through the guide pipe (3152) and is connected to the guide pipe (3152) at the end side in a sealing manner, and the inlet core tube (317) is inserted into the second inlet pipe (210) together with the guide pipe (3152), so that the inlet core tube (317) and the second inlet pipe (210) are in fluid communication.

6. The fluid channel according to claim 5, characterized in that the return channel further comprises a first section of return path (31) and a second section of return path (32), the first section of return path (31), the second section of return path (32), the third section of return path (33) and the fourth section of return path (34) being defined by the first transfer unit (100), the second transfer unit (200), the ablation needle (300), the first adapter means (230) and the second adapter means (240).

7. The fluid channel according to claim 6, wherein the ablation needle (300) further comprises a flow inlet and return assembly (310), the flow inlet and return assembly (310) comprising an inner tube (313) connected to the flow inlet tube (317) and disposed outside the flow inlet tube (317), the inner tube (313) being in fluid communication with the second return tube (220) of the second delivery unit (200);

the first section of the backflow path (31) is defined by the inner wall of the inner pipe (313) and the outer wall of the inflow core pipe (317).

8. The fluid channel of claim 7, wherein an end of the transition sleeve (315) opposite the sealed chamber (3151) is further provided with a groove (3154) in fluid communication with the sealed chamber (3151);

the groove (3154) is in fluid communication with the sealing chamber (3151) through a drainage aperture (3155);

the bottom of the groove (3154) is provided with a drainage hole (3155) extending towards the sealing chamber (3151), the drainage hole (3155) is located in the circumferential direction of the guide tube (3152), the drainage hole (3155) is in fluid communication with the groove (3154) and the sealing chamber (3151), respectively;

the second segment return path (32) is defined by the groove (3154), the drainage aperture (3155), and the sealing chamber (3151).

9. The fluid channel according to claim 8, characterized in that the inner tube (313) is in a fitting connection with the groove (3154) and that the end of the damping means (316) of the inner tube (313) abuts against the inner wall of the groove (3154);

the inflow core tube (317) is in fit connection with the guide tube (3152) so that the first section of the backflow path (31) defined by the inner wall of the inner tube (313) and the outer wall of the inflow core tube (317) is in fluid communication with the drainage hole (3155) so that the first section of the backflow path (31) is in fluid communication with the second section of the backflow path (32).

10. The fluid channel according to claim 8 or 9, characterized in that the sum of the depth of the groove (3154) and the depth of the drainage hole (3155) in axial direction is the axial wall thickness of the sealing chamber (3151).

11. A fluid passage according to any one of claims 7-9, c h a r a c t e r i z e d in that the third section return path (33) is defined by a return aperture (262) at the end of the first quick connection means (260), the inner wall of the second return conduit (220) and the outer wall of the second inlet conduit (210);

the first quick connection device (260) is in sealing connection with the sealing chamber (3151), and the return hole (262) is in fluid communication with the sealing chamber (3151) to place the second section return path (32) and the third section return path (33) in fluid communication.

12. A fluid channel according to any of claims 7-9, characterised in that the fourth section of the return path (34) is defined by a first return pipe (120) of the first transfer unit (100), which first return pipe (120) communicates with the second return pipe (220) via the second adapter means (240), the direction of flow of the fluid in the second return pipe (220) being redirected by the second adapter means (240) to return to the first return pipe (120).

13. A fluid passage according to claim 12, characterized in that the axes of the first inlet pipe (110) and the second inlet pipe (210) are perpendicular, and the second adapter device (240) comprises a three-way adapter (241), wherein the three-way adapter (241) is used for sealing connection with the adapter (231);

a third matching hole (242) and a fourth matching hole (243) are formed in the three-way adapter (241); the third mating hole (242) is used for accommodating the first return pipe (120), the fourth mating hole (243) is configured to penetrate through a stepped hole of the three-way adapter (241), and one side of the fourth mating hole (243) is used for accommodating a first conical outer wall (237) of the adapter (231) so that the three-way adapter (241) and the adapter (231) form a sealing connection at the position;

the other side of the fourth matching hole (243) accommodates the second return pipe (220), the penetrating end surface of the second return pipe (220) is abutted against the lower step surface in the fourth matching hole (243), and the third matching hole (242), the fourth matching hole (243), the second matching hole (233) and the first matching hole (232) are in fluid communication, so that the third-section return path (33) and the fourth-section return path (34) are in fluid communication.

14. An ablation needle system comprising the fluid channel of any of claims 1-13.