Interventional catheter and on-off device thereof
By installing a valve core control component inside the interventional catheter and using a magnetic switch or elastic control component to achieve non-contact on/off control of the interventional catheter, the problems of poor sealing and insufficient multi-functional adaptability in the prior art are solved, and sealing performance and multi-functional adaptability are achieved in low-temperature environments.
Patent Information
- Application Number
- CN202423060566.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2034-12-12
AI Technical Summary
The current method of controlling the on/off state of interventional catheters mainly relies on external equipment, resulting in poor sealing. Mechanical valves are prone to failure, especially in low-temperature environments, making it impossible to achieve multi-functional use.
The valve core inside the valve body is used for on/off control. Non-contact control is achieved by using a magnetic switch or elastic control element to ensure sealing. Various on/off devices are set on the interventional catheter to meet various functional requirements.
It achieves the maintenance of the sealing of interventional catheters in low-temperature environments, reduces dependence on external equipment, has a simple and reliable structure, and is suitable for various functional applications of interventional catheters.
Smart Images
Figure CN223944776U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of medical apparatus and instruments, especially to an on-off device of an interventional catheter and the interventional catheter. BACKGROUND
[0002] The interventional catheter is an essential medical apparatus and instrument in an interventional operation, and can be divided into ablation catheters, expansion catheters, delivery catheters and contrast catheters based on its functions; the ablation catheter is a key component for delivering or generating physical energy to ablate tumor tissue for treatment, and can be further divided into cryoablation catheters, radiofrequency ablation catheters, microwave ablation catheters and thermal steam ablation catheters based on its ablation principle; the expansion catheter is usually used to expand and / or support the local lumen during the operation, for example, for pulmonary valve stenosis, the balloon expansion catheter is sent to the pulmonary valve stenosis and pressurized, and the balloon expansion catheter tension causes the stenosis valve to tear, thereby relieving the pulmonary valve stenosis; the delivery catheter is used to build a delivery channel, which can help the doctor to deliver drugs, instruments and the like during the operation.
[0003] To facilitate further understanding, taking the cryoablation interventional catheter and the balloon expansion catheter as examples, the cryoablation interventional catheter delivers the cryogen in its lumen to achieve the treatment purpose, and uses the channel in its cavity to deliver the refrigerant to form a low temperature in the local area for treatment. The balloon expansion catheter uses the delivery medium to change the pressure inside the balloon to achieve the expansion effect. However, the on-off of the existing interventional catheter pipeline is controlled by the external equipment connected to the catheter. The flow of the medium in the catheter pipeline is controlled by the matching equipment, such as a valve provided on the external equipment to control the on-off of the pipeline. However, the on-off of the internal pipeline of the catheter by the external equipment is only applicable to simple pipeline structures, which limits the possibility of realizing multiple functions by the same catheter. In addition, if a common mechanical valve control scheme is used on the interventional catheter, the control member of the mechanical valve needs to be arranged outside the catheter, which poses a challenge to the sealing of some types of interventional catheters. For example, when the cryogenic interventional catheter is used for treatment, the liquid nitrogen cryogen flows in the interventional catheter, and the external control member of the mechanical valve will freeze due to contact with the water molecules in the air under the action of low temperature, thereby affecting the use and even failing, and losing the control of the flow of the medium in the catheter.
[0004] Therefore, there is an urgent need for an on-off device and an interventional catheter which can be installed on the interventional catheter without affecting the sealing of the interventional catheter and can be normally used in the working environment of the medium. SUMMARY
[0005] The utility model provides an on-off device and an interventional catheter, which controls the on-off by controlling the valve core sealed in the valve body through the valve core control member, has a simple and reliable structure, and does not affect the sealing of the interventional catheter during installation.
[0006] The utility model provides a kind of on-off device of intervention catheter, comprising: intervention catheter interface, valve body, valve core, valve core control piece;The valve body includes the first end of working medium inflow and the second end of working medium outflow, the intervention catheter interface is set in the first end and the second end, for accessing intervention catheter, so that the working medium in the intervention catheter flows into and flows out the valve body, the valve body includes valve core cavity, the diameter of the valve core cavity is greater than the maximum diameter of the valve core, and greater than the intervention catheter interface diameter, the valve core is placed in the valve core cavity, the valve core diameter is less than the valve core cavity, and the diameter of the valve core is greater than the diameter of the intervention catheter interface, the valve core control piece is arranged outside valve body and is not connected with valve core, the valve core control piece can control the valve core cut off or communicate the intervention catheter interface and the valve core cavity in non-physical contact mode.
[0007] Further, the on-off device of intervention catheter also includes valve core gasket, the valve core gasket is arranged in the intervention catheter interface of the second end.
[0008] Further, the valve core control piece is magnetic control switch, when the magnetic control switch adsorbs the valve core, the valve core is in intermediate position, the valve core cavity is communicated with the intervention catheter interface;When the magnetic control switch is separated from adsorbing the valve core, the valve core cavity is cut off with the intervention catheter interface.
[0009] Further, the valve core gasket is arranged in the first end and the second end of the intervention catheter interface.
[0010] Further, the valve core control piece is magnetic control piece, when the magnetic control piece adsorbs the valve core in intermediate position, the valve core cavity is communicated with the intervention catheter interface;When the magnetic control piece adsorbs the valve core to the first end or the second end, the valve core cavity is cut off with the intervention catheter interface.
[0011] Further, the valve core control piece is elastic control switch.
[0012] Further, the elastic control switch includes elastic cavity, the elastic cavity is used to accommodate the valve core, the elastic cavity is deformed under external force, and the valve core is ejected to cut off the valve core cavity and the intervention catheter interface.
[0013] Further, the valve core cavity is dumbbell-shaped.
[0014] Further, it also includes isolation pipeline and magnetic conducting part, the magnetic control switch is arranged outside the isolation pipeline;The isolation pipeline is sleeved outside the valve body;The magnetic conducting part is arranged between the valve body and the isolation pipeline, and the magnetic control switch can control the valve core to move through the magnetic conducting part.
[0015] The utility model provides a kind of intervention catheter, including balloon, catheter air inlet pipe, catheter air return pipe and three like above any one intervention catheter's on-off device;The on-off device of intervention catheter includes first on-off device, second on-off device and third on-off device;The first on-off device is connected with the catheter air inlet pipe, the second on-off device is connected with the catheter air return pipe, the third on-off device is connected between the catheter air inlet pipe and the catheter air return pipe, and the third on-off device is compared with the first on-off device and the second on-off device close to proximal end setting.
[0016] Compared with prior art, the present application has at least the following beneficial effects:
[0017] 1, the valve core control piece of the utility model is magnetic control switch, and work is completed by magnetic force acting on the valve core sealed in the valve body, to ensure the sealing of intervention catheter in non-contact control mode;And magnetic control switch can be set at a certain distance from the outer surface of catheter, to prevent the failure of catheter in working medium environment. For example, prevent the outer layer of catheter from icing under the low temperature effect of internal frozen working medium, causing the failure of control piece.
[0018] 2, the utility model also proposes that elastic control piece is used as valve core control piece, to ensure the sealing of intervention catheter and on-off device in a completely closed structure.
[0019] 3, the utility model sets up on-off device on intervention catheter, reduces the dependence on external equipment control on-off, and mechanical on-off structure is simple and reliable, and can be applied to various purposes of intervention catheter. BRIEF DESCRIPTION OF DRAWINGS
[0020] The drawings incorporated herein and forming a part of the specification, illustrate embodiments consistent with the present utility model, and together with the specification serve to explain the principles of the utility model.
[0021] Figure 1 It is the cross-sectional view of the on-off device of intervention catheter of one embodiment of the utility model.
[0022] Figure 2 It is the cross-sectional view of the on-off device of intervention catheter of another embodiment of the utility model
[0023] Figure 3 It is the cross-sectional view of the on-off device of intervention catheter of another embodiment of the utility model
[0024] Figure 4 It is the cross-sectional view of the on-off device of intervention catheter of another embodiment of the utility model
[0025] Figure 5The utility model discloses a connection diagram of intervention catheter of one embodiment of the utility model
[0026] Reference signs: intervention catheter interface 11, valve body 12, valve core 13, first end 121, second end 122, valve core gasket 15, magnetic control switch 141, magnetic control member 142, elastic cavity 144, dumbbell-shaped cavity 16, isolation pipeline 17, magnetic conductive component 18, balloon 19, catheter air inlet pipe 20, catheter air return pipe 21, first on-off device 22, second on-off device 23, third on-off device 24, large-diameter cavity 25, small-diameter cavity 26, valve core cavity 27, limiting portion 28, limiting film 29, wire 30. DETAILED DESCRIPTION
[0027] The exemplary embodiments are described herein with reference to the accompanying drawings, of which examples are shown. Aspects of the following exemplary embodiments are intended for discussion, unless otherwise indicated, and are not intended for limitation. That is, this detailed description is exemplified to assist in providing a thorough understanding of aspects of the application as defined by the claims included herein and their equivalents. Accordingly, those skilled in the art will recognize that other systems and methods can be developed and used, and are encompassed within the scope of the application presented herein.
[0028] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The use of the terms "including", "comprising", "comprises" or "having" and the like in the detailed description are used herein to mean including at least the recited elements or steps, and not excluding other elements or steps. The use of the terms "connected" or "coupled" or the like does not exclude the presence of intermediate elements or intervening components between the connected or coupled components and that the term so used is intended to connote a relationship between components or elements without necessarily being directly connected or coupled.
[0029] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The use of the terms "including", "comprising", "comprises" or "having" and the like in the detailed description are used herein to mean including at least the recited elements or steps, and not excluding other elements or steps. The use of the terms "connected" or "coupled" or the like does not exclude the presence of intermediate elements or intervening components between the connected or coupled components and that the term so used is intended to connote a relationship between components or elements without necessarily being directly connected or coupled.
[0030] In the present application, the distal end refers to the end of the medical device that is far away from the operator during normal use, and the proximal end is usually close to the operator. The proximal end and the distal end are relative to each other to describe the relative position, and do not specifically refer to a certain specific part.
[0031] Example 1
[0032] like Figure 1 As shown, an interventional catheter connection / disconnection device includes: an interventional catheter interface 11, a valve body 12, a valve core 13, a valve core control component, and a valve core gasket 15. The valve body 12 includes a first end 121 for working fluid inflow and a second end 122 for working fluid outflow. The interventional catheter interface 11 is disposed at the first end 121 and the second end 122 for connecting the interventional catheter, allowing the working fluid in the interventional catheter to flow into and out of the valve body 12. The valve body 12 includes a valve core cavity 27, the diameter of which is larger than the maximum diameter of the valve core 13 and larger than the diameter of the interventional catheter interface 11. The valve core 13 is placed in the valve core cavity 27, the diameter of which is smaller than that of the valve core cavity 27 and larger than the diameter of the interventional catheter interface 11. The valve core control component is disposed outside the valve body 12 and can control the valve core 13 to cut off or open the interventional catheter interface 11 and the valve core cavity 27. In this embodiment, the valve core control component is a magnetic switch 141. When the magnetic switch 141 attracts the valve core 13, the valve core 13 is in the middle position. The middle position means that the valve core 13 is attracted by the magnetic switch 141 and is located in the center of the valve core cavity 27, allowing the working fluid to flow through the gap between the valve core 13 and the valve core cavity 27. Since the diameter of the valve core 13 is smaller than that of the valve core cavity 27, the working fluid can flow through the gap between the valve core cavity 27 and the valve core 13 to pass through the valve body 12, forming a passage between the interventional catheter interface 11 and the valve core cavity 27. The on / off device is in the conducting state. When the valve core 13 is detached from the magnetic switch 141, since the diameter of the valve core 13 is larger than that of the interventional catheter interface 11, the valve core 13 blocks the interventional catheter interface 11 under the action of the flowing working fluid, and the working fluid is cut off. At this time, the on / off device is in the cut-off state. The valve core gasket 15 surrounds the conduit interface at the second end 122. The valve core gasket 15 allows the valve core 13 to adhere tightly to the valve core gasket 15 under the pressure of the flowing working fluid after it is detached from the magnetic switch 141, thus enhancing the sealing performance of the on / off device when it is turned off.
[0033] Example 2
[0034] like Figure 2As shown, unlike Embodiment 1, the valve core gasket 15 is provided at both the first end 121 and the second end 122 of the interventional catheter interface 11. In this embodiment, the valve core control element is a magnetic control element 142, with the valve core 13 in the middle position, and the valve core cavity 27 communicating with the interventional catheter interface 11. The middle position here refers to the magnetic control element 142 attracting the valve core 13 away from the first end 121 and the second end 122, i.e., the valve core 13 is in the center of the valve core cavity 27, allowing the working fluid to flow through the gap between the valve core 13 and the valve core cavity 27, connecting the interventional catheter interface 11 and the valve core cavity 27. At this point, the on / off device is activated. When the magnetic control element 142 attracts the valve core 13 to the first end 121 or the second end 122, the valve core 13 blocks the interventional catheter interface 11, thus cutting off the working fluid. Both ends are equipped with valve core gaskets 15, which allows the on / off device to block the flow of working fluid in both directions, so that when used in interventional catheters, such as balloon dilation catheters, the pressure inside the catheter channel is greater than the external air pressure, it still has a sealing effect.
[0035] In some embodiments, the valve core cavity 27 is a dumbbell-shaped cavity 16, meaning the valve core cavity 27 has a small-diameter cavity 26, and both ends of the dumbbell-shaped cavity 16 are large-diameter cavities 25. The valve core 13 is also configured in a dumbbell shape to adapt to the dumbbell-shaped cavity 16. When the on / off device is turned off, the dumbbell-shaped valve core 13 can block both the interventional catheter interface 11 and the small-diameter cavity 26. Compared to Embodiment 1, this embodiment can enhance the effect of the valve core 13 in blocking the flow of the working fluid and has better sealing performance.
[0036] Example 3
[0037] like Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that the valve core control component is an elastic control switch. In this embodiment, the elastic control switch includes an elastic cavity 144, and the valve core 13 is movably disposed in the elastic cavity 144. The intervention catheter interface 11 of the first end 121 and the second end 122 is connected to the valve core cavity 27, and the working fluid can flow unimpeded from the first end 121 to the second end 122.
[0038] The elastic cavity 144 is used to accommodate the valve core 13. Under external force, the elastic cavity 144 deforms, ejecting the valve core 13 to disconnect the valve body 12 from the interventional catheter interface 11. The elastic cavity 144 is generally made of a flexible material. Pressing the elastic cavity 144 causes it to deform in the radial direction, thereby causing the valve core 13 to detach. Under the action of the flowing working fluid, the valve core 13 blocks the interventional catheter interface 11 located at the second end 122, thus preventing the working fluid from flowing from the first end 121 to the second end 122, achieving the purpose of blocking the flow of the working fluid at the location of the on / off device.
[0039] In some embodiments, the valve core 13 is movably arranged in the valve core cavity 144. The movable arrangement can be a flexible control switch including a limiting part 28 made of flexible material, which limits the valve core 13 in the valve core cavity 144 and allows the valve core 13 to exert pressure on the limiting part 28 to deform the limiting part 28 and make the valve core 13 move out under the action of external force. The movable arrangement can also be a flexible control switch including a limiting film 29 having a small-diameter aperture, which limits the valve core 13 in the valve core cavity 144. The small-diameter aperture has a certain tension, so that the valve core 13 can move out of the limiting film 29 under the action of external force. The limiting film 29 can also be arranged in a closed manner, so that the valve core 13 exerts pressure on the limiting film 29 to break the limiting film 29 and move out under the action of external force. The valve core 13 is movably connected inside the elastic cavity 144. In this embodiment, the connection is a wire 30, which is used to reset the valve core 13 after the valve core 13 is moved out. The valve core 13 is pulled / pressed into the elastic cavity 144, so that the on-off device of this embodiment can be used multiple times.
[0040] Compared with the above embodiments, the arrangement of the flexible control switch in this embodiment makes the on-off device less affected by the valve core 13 in the on state, and the installation of the on-off device does not affect the working medium flow, thereby reducing the influence of the on-off device on the working medium flow.
[0041] Embodiment Four
[0042] As Figure 4As shown, compared with the first embodiment, the embodiment adds isolation pipeline 17 and magnetic component 18, magnetic control switch 141 is arranged outside isolation pipeline 17, isolation pipeline 17 is sleeved outside valve body 12, magnetic component 18 is fixedly arranged between valve body 12 and isolation pipeline 17, the magnetic component 18 can be annular, and is fixedly arranged outside the valve body 12 in a manner of gluing or welding, and the magnetic component 18 can cover the moving range of the magnetic control switch in the axial direction. In this way, the magnetic control switch 141 can act on the valve core 13 through the magnetic component 18. When the magnetic control switch 141 adsorbs the valve core 13 through the magnetic component 18, the valve core 13 is in the intermediate position. The intermediate position refers to that the valve core 13 is attracted by the magnetic control switch 141 and is in the center of the valve core cavity 27, so that the working medium can flow between the valve core 13 and the valve core cavity 27. Since the diameter of the valve core 13 is smaller than that of the valve core cavity 27, the working medium can flow between the valve core cavity 27 and the valve core 13 to pass through the valve body 12, and the valve core cavity 27 and the intervention catheter interface 11 are connected to form a passage. The on-off device is in the on state. Push the magnetic control switch 141 to a position away from the valve core 13, and the valve core 13 falls off under the action of the flowing working medium and tightly presses the valve core gasket 15 of the second end 122 after losing the attraction force, and the intervention catheter interface 11 and the valve core cavity 27 are cut off to prevent the working medium from flowing, and the on-off device is in the off state. The isolation pipeline 17 of the embodiment can increase the airtightness of the intervention catheter, and the flowing working medium in the intervention catheter is generally used for heat exchange. The internal space formed between the isolation pipeline 17 and the valve body 12 can be used for multiple functions, for example, in a cryoablation intervention catheter, the internal space is vacuumized to improve the heat insulation effect. Therefore, the arrangement of the isolation pipeline 17 helps to enhance the heat insulation of the intervention catheter and improve the efficiency of heat exchange of the intervention catheter.
[0043] Embodiment five
[0044] As Figure 5As shown, the embodiment provides an interventional catheter, which includes a balloon 19, a catheter air inlet pipe 20, a catheter air return pipe 21, and three on-off devices of the interventional catheter as described above, which are a first on-off device 22, a second on-off device 23, and a third on-off device 24. The first on-off device 22 is connected with the catheter air inlet pipe 20 to conduct or block the flow of the working medium in the catheter air inlet pipe 20; the second on-off device 23 is connected with the catheter air return pipe 21 to conduct or block the flow of the working medium in the catheter air return pipe 21. The third on-off device 24 is connected between the catheter air inlet pipe 20 and the catheter air return pipe 21, and the third on-off device 24 is arranged closer to the proximal end than the first on-off device 22 and the second on-off device 23, and the third on-off device 24 can connect the catheter air inlet pipe 20 and the catheter air return pipe 21. Taking a cryoablation catheter as an example, the first on-off device 22 and the second on-off device 23 are turned off, and the third on-off device 24 is turned on, so that the cryogenic working medium flows in the air inlet pipe and the proximal end of the catheter air return pipe 21 to play a precooling role, reducing the precooling time of the catheter during treatment; during treatment, the first on-off device 22 and the second on-off device 23 are turned on, and the third on-off device 24 is turned off to make the working medium flow to the distal balloon 19, so that the interventional catheter can play a precooling role and a treatment role. The on-off device is installed on the interventional catheter, so that the structure of the interventional catheter can be multifunctional to meet various actual needs.
[0045] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the claims and their equivalents. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the application being indicated by the following claims.
Claims
1. An on-off device for an interventional catheter, comprising: The intervention catheter interface, valve body, valve core, valve core control; the valve body includes a first end of working fluid inflow and a second end of working fluid outflow, the intervention catheter interface is arranged at the first end and the second end, and is used for accessing the intervention catheter, so that the working fluid in the intervention catheter flows into and out of the valve body, characterized in that the valve body includes a valve core cavity, the diameter of the valve core cavity is greater than the maximum diameter of the valve core and is greater than the diameter of the intervention catheter interface, the valve core is arranged in the valve core cavity, the diameter of the valve core is smaller than the valve core cavity, and the diameter of the valve core is greater than the diameter of the intervention catheter interface, the valve core control is arranged outside the valve body and is not connected with the valve core, and the valve core control can control the valve core to cut off or communicate the intervention catheter interface and the valve core cavity in a non-physical contact manner.
2. The on-off device of an interventional catheter according to claim 1, characterized in that Further comprising a valve core gasket arranged at the intervention catheter interface of the second end.
3. The on-off device of an interventional catheter according to claim 2, characterized in that The valve core control is a magnetic control switch, when the magnetic control switch adsorbs the valve core, the valve core is in an intermediate position, the valve core cavity communicates with the intervention catheter interface; when the magnetic control switch is separated from the valve core, the valve core cavity is cut off from the intervention catheter interface.
4. The on-off device of an interventional catheter according to claim 2, characterized in that The valve core gasket is arranged at the first end and the second end of the intervention catheter interface.
5. The on-off device of an interventional catheter according to claim 4, characterized in that When the valve core control is a magnetic control switch, when the magnetic control switch adsorbs the valve core to the intermediate position, the valve core cavity communicates with the intervention catheter interface; when the magnetic control switch adsorbs the valve core to the first end or the second end, the valve core cavity is cut off from the intervention catheter interface.
6. The on-off device of an interventional catheter according to claim 1, characterized in that The valve core control is an elastic control switch.
7. The on-off device of an interventional catheter according to claim 6, characterized in that The elastic control switch includes an elastic cavity for accommodating the valve core, and the elastic cavity deforms under external force to pop out the valve core to cut off the valve core cavity from the intervention catheter interface.
8. The on-off device of an interventional catheter according to claim 5, characterized in that, The valve core cavity is dumbbell-shaped.
9. The on-off device of an interventional catheter according to claim 3, characterized in that, Further comprising an isolation pipeline and a magnetic conducting component, the magnetic control switch is arranged outside the isolation pipeline; the isolation pipeline is sleeved outside the valve body; the magnetic conducting component is arranged between the valve body and the isolation pipeline, and the magnetic control switch can control the valve core to move through the magnetic conducting component.
10. An intervention catheter, comprising a balloon, a catheter air inlet pipe, a catheter air return pipe, and three intervention catheter on-off devices according to any one of claims 1-9; the intervention catheter on-off devices include a first on-off device, a second on-off device, and a third on-off device; the first on-off device is connected with the catheter air inlet pipe, the second on-off device is connected with the catheter air return pipe, and the third on-off device is connected between the catheter air inlet pipe and the catheter air return pipe, and the third on-off device is arranged closer to the proximal end than the first on-off device and the second on-off device.