Air exhaust spray cryoablation catheter

Abstract

The utility model discloses an air exhaust spray cryoablation catheter, which comprises a catheter main body, the catheter main body comprises a medium pipeline and a vacuum pipeline, the outer wall of the catheter main body is provided with an air exhaust table piece which is convexly arranged relative to a spray part, and an air exhaust surface is formed on one side, facing the spray part, of the air exhaust table piece; one end of the air exhaust pipeline is communicated to the air exhaust opening, and the other end of the air exhaust pipeline is used for being connected to air exhaust equipment. The active exhaust mechanism is arranged on the catheter, so that the defect that exhaust is unstable when an existing catheter adopts a passive exhaust channel is overcome, the complication risk is reduced, the operation safety is improved, the life safety of a patient is effectively guaranteed, and the doctor-patient relationship is effectively maintained.

Description

Technical Field

[0001] The utility model belongs to the field of medical instruments, and in particular relates to a spray cryoablation catheter used for cryoablation. Background Art

[0002] Spray cryoablation is an emerging treatment method. It has achieved good results in clinical trials at home and abroad due to its high efficiency, safety and lack of complications. It is widely used in minimally invasive surgery for multiple lesions.

[0003] When spray freezing is performed through bronchoscope for the treatment of COPD (chronic obstructive pulmonary disease), the therapeutic medium needs to be evenly applied to the lesion site through the nozzle structure at the head end. During the process, the therapeutic medium will expand instantly in volume during heat exchange due to its own physical properties. Therefore, it is necessary to ensure sufficient exhaust channels to allow the expanded gas to be discharged smoothly, thereby reducing the occurrence of complications.

[0004] In the prior art, the gap exhaust method is generally used for exhaust. During clinical operation, the operator first selects a tracheal tube and a bronchoscope of matching size to create a gap between the two to achieve the purpose of artificially constructing an exhaust channel. The principle is to spray the human bronchial tree. Since the end of the bronchial tree is closed, the pressure difference between it and the external environment allows the therapeutic medium to be smoothly discharged from the gap between the tracheal tube and the bronchoscope, thereby ensuring the safety of the bronchi in the body.

[0005] However, since the exhaust process is passive, it has the following defects:

[0006] 1. When the surgical operator uses an endotracheal tube or bronchoscope of the wrong specifications and models, it is easy for the exhaust gap to be too small, making it difficult for the gas to be discharged smoothly, which in turn causes risks such as pneumothorax.

[0007] Second, the driving force for the expulsion of the therapeutic medium comes from the pressure difference between the bronchial tree and the external environment. Therefore, during treatment, the bronchial tree is subjected to a higher pressure. Excessive pressure will compress the bronchial tree wall and even cause irreversible damage.

[0008] 3. The extremely low temperature of the treatment medium may cause foreign matter such as sputum in the bronchi to be frozen in the exhaust passage, thereby blocking the exhaust and increasing the risk of surgery. Utility Model Content

[0009] Based on the instability of the passive exhaust channel of the spray cryoablation treatment device in the prior art, there are hidden dangers to the safety of patients during the operation. It is planned to use a catheter with a self-exhaust function to solve this technical problem. To this end, the technical solution adopted is:

[0010] A vacuum spray cryoablation catheter comprises a catheter body, the catheter body comprises a medium pipeline and a vacuum pipeline, and the spray component is connected with the medium pipeline, so as to realize the function of the spray cryoablation catheter consistent with the prior art. A vacuum table is sleeved on the outer wall of the catheter body, and a vacuum surface is formed on the side of the vacuum table facing the spray component, and a vacuum port is through-set on the vacuum surface, one end of the vacuum pipeline is connected to the vacuum port, and the other end is used to connect to a vacuum device for vacuuming.

[0011] After adopting this technical solution, by setting a vacuum platform on the front outer wall of the spray cryoablation catheter and setting a vacuum port thereon, the vacuum port is not easily blocked during the cryoablation operation to affect the exhaust effect, thereby achieving effective extraction of gas during the cryoablation operation and reducing the occurrence of complications.

[0012] According to the above-mentioned vacuum spray cryoablation catheter, wherein: the vacuum platform is a circular ring-shaped component and is sleeved on the outer wall of the catheter body; the vacuum platform includes a first diameter portion, a second diameter portion and a platform body connected therebetween, so as to form a vacuum cavity in the vacuum platform that is connected to the vacuum port; the size of the first diameter portion is smaller than the second diameter portion. Compared with other methods of only setting the vacuum structure on one side of the catheter body, setting the vacuum platform as a ring-shaped component and sleeved on the outside of the catheter body can, on the one hand, reduce the radial protrusion of the vacuum platform relative to the catheter body and avoid the vacuum platform from harming the human body during the catheter pushing process; on the other hand, it can also increase the area of ​​the vacuum port and improve the vacuum efficiency.

[0013] According to the above-mentioned vacuum spray cryoablation catheter, wherein: the platform body is of a conical structure, so that the catheter has a relatively smooth outer wall from front to back to reduce the possibility of harming the human body during the pushing process, and this is also conducive to pushing the catheter into the human body.

[0014] According to the above-mentioned vacuum spray cryoablation catheter, wherein: the first diameter portion and the second diameter portion are both cylindrical portions, which is conducive to smooth connection and tight sealing between the vacuum platform and the catheter body.

[0015] According to the above-mentioned vacuum spray cryoablation catheter, wherein: the number of the vacuum pipelines is one or more, and they are connected to the vacuum port through the vacuum cavity; compared with having only one vacuum pipeline, multiple vacuum pipelines can further improve the vacuum efficiency during surgery and reduce the probability of blockage.

[0016] According to the above-mentioned suction spray cryoablation catheter, wherein: the suction surface is convexly arranged relative to the spray component and the suction port is arranged toward the spray component, so that the suction surface is not easily blocked and it is more conducive to the gas being smoothly sucked out through the suction port. Optimally, the suction port is arranged to be axially through to make the air flow smooth.

[0017] According to the above-mentioned vacuum spray cryoablation catheter, it also includes a temperature control module and a heating component. The vacuum table is made of heat-conductive material, and the heating component is arranged in the vacuum cavity, so that the vacuum table is heated by the heating component to increase the temperature of the extracted gas, and the gas passing through the cross-section is heated, thereby avoiding the hidden danger of the gas freezing and blocking the vacuum channel due to foreign matter (sputum, blood clots, etc.).

[0018] According to the above-mentioned vacuum spray cryoablation catheter, it also includes a sheath that is movably arranged axially or circumferentially relative to the vacuum platform, and the number or size of the vacuum ports for vacuum operation can be changed by covering the vacuum ports by the sheath to adjust the vacuum power to meet different usage needs.

[0019] According to the above-mentioned vacuum spray cryoablation catheter, wherein: the catheter body is a three-layer pipeline, and the three-layer pipeline is concentrically arranged; the outer layer of the pipeline is the vacuum layer, which is used to absorb the vaporized medium after cryoablation; the middle layer of the pipeline is the vacuum layer, which is used for heat insulation; the inner layer of the pipeline is the medium pipeline, which is used to input the cryoablation medium.

[0020] According to the above-mentioned vacuum spray cryoablation catheter, wherein: the distance between the vacuum platform and the spray component is 0.5-20 cm.

[0021] According to the above-mentioned vacuum spray cryoablation catheter, wherein: the vacuum port is in various shapes such as circular, elliptical, fan-shaped, rectangular, racetrack, etc., and the number and setting positions of the vacuum ports can also be set as needed.

[0022] According to the above-mentioned vacuum spray cryoablation catheter, wherein: the shape of the vacuum surface is a conical surface, a curved surface or a group of flat surfaces.

[0023] The vacuum spray cryoablation catheter of the utility model has at least the following beneficial effects:

[0024] 1. The catheter used for cryoablation treatment has an active exhaust function, which avoids the various deficiencies caused by the instability of the existing passive exhaust channel, achieves continuous exhaust during the operation, reduces the risk of complications and improves the safety of the operation, effectively protects the patient's life safety and maintains the doctor-patient relationship.

[0025] 2. The air extraction platform is arranged on the outer wall of the duct body and is convexly arranged relative to the spray component, so that the air extraction port is not easily blocked and ensures that the duct can always effectively enhance active exhaust.

[0026] 3. The suction table is preferably formed of a sleeve-shaped component, which is sleeved on the outer wall of the catheter body to avoid harming the patient when the catheter is pushed, and to avoid the catheter being too large and unsuitable for use due to the provision of an exhaust structure.

[0027] 4. With the heating function, the gas passing through the cross section can be heated to prevent the gas from freezing when encountering foreign matter such as sputum and blood clots, thereby blocking the suction channel.

[0028] 5. The size or number of the air extraction port can be adjusted as needed with the movable sheath to meet the needs of more usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic cross-sectional structure diagram of the vacuum spray cryoablation catheter of the first embodiment of the utility model;

[0030] Figure 2 yes Figure 1 A schematic structural diagram of the vacuum table in the embodiment;

[0031] Figure 3 yes Figure 2 A front view of the exhaust table;

[0032] Figure 4 a-4d are structural schematic diagrams and front views of the vacuum table in other embodiments; two embodiments are included, Figure 4 a, 4b are schematic diagrams of structures from different viewing angles in the same embodiment, Figure 4 c and 4d are schematic diagrams of structures in different perspectives of another embodiment, the difference between the two is that the size and number of the air extraction ports 112 are different;

[0033] Figure 5 a-5b is a partial cross-sectional schematic diagram and a cross-sectional view of the vacuum spray cryoablation catheter of the second embodiment of the present utility model. In this embodiment, the catheter body 100 is composed of three layers of concentrically arranged pipes and the number of the vacuum pipelines 117 is three, namely, a first vacuum pipeline 1171, a second vacuum pipeline 1172 and a third vacuum pipeline 1173;

[0034] Figure 6 It is a schematic cross-sectional structure diagram of the vacuum spray cryoablation catheter of the third embodiment of the utility model;

[0035] Figure 7 yes Figure 1 A schematic diagram of the use of the vacuum spray cryoablation catheter of the embodiment when acting on the lungs and a partial enlarged diagram thereof;

[0036] Figure 8 is a schematic diagram of another embodiment of the use of the vacuum spray cryoablation catheter when acting on the lungs and a partial enlarged diagram thereof, which is similar to Figure 7 The difference is that the shape of the air extraction surface 111 changes from a conical surface to an arc surface.

[0037] Among them, there are a catheter body 100, a medium pipeline 101, a vacuum pipeline 102, a spray component 103, a spray hole 104, a vacuum table 110, a vacuum surface 111, a vacuum port 112, a vacuum cavity 113, a first diameter portion 114, a second diameter portion 115, a table body 116, a vacuum pipeline 117, a temperature control module 201, a heating component 202, an outer layer pipeline 121, a middle layer pipeline 122, an inner layer pipeline 123, a first vacuum pipeline 1171, a second vacuum pipeline 1172 and a third vacuum pipeline 1173. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the present invention, and thus to more clearly define the scope of protection claimed by the present invention, the present invention is described in detail below with respect to certain specific embodiments of the present invention. It should be noted that the following are only certain specific implementation methods of the present invention, which are only part of the embodiments of the present invention, wherein the specific and direct description of the relevant structures is only for the convenience of understanding the present invention, and each specific feature does not naturally and directly limit the scope of implementation of the present invention. The conventional selections and substitutions made by those skilled in the art under the guidance of the present invention shall be deemed to be within the scope of protection claimed by the present invention.

[0039] Embodiment 1

[0040] A vacuum spray cryoablation catheter includes a catheter body 100, wherein a medium pipeline 101 and a vacuum pipeline 102 are formed in the catheter body 100, and a spray component 103 is connected to the medium pipeline 101, wherein one end of the medium pipeline 101 is connected to a medium source, and the other end is connected to the spray component 103 to transport the medium in the medium source to the spray component 103 for spraying to achieve cryoablation; the vacuum pipeline 102 is connected to a vacuum generator to generate a vacuum. The catheter body 100 can be composed of a single or assembled pipeline, and the medium pipeline 101, the vacuum pipeline 102 and the spray component 103 are sleeved therein or formed thereon, or the catheter body 100 is formed by the vacuum pipeline 102. A plurality of spray holes 104 are provided on the side wall of the spray component 103, which are used to spray the treatment medium transported by the medium pipeline 101 in a spray manner for cryoablation treatment.

[0041] For example, in Figure 1 In the illustrated embodiment, the medium pipeline 101 and the vacuum pipeline 102 are both pipeline-shaped components. The diameter of the medium pipeline 101 is smaller than that of the vacuum pipeline 102 so that the medium pipeline 101 can be sleeved inside the vacuum pipeline 102 , so that the vacuum pipeline 102 can form the catheter body 100 .

[0042] For example, in other embodiments, the catheter body 100 is formed of a pipe-shaped component having a larger diameter to allow the medium pipeline 101 and the vacuum pipeline 102 to be sleeved therein, that is, the catheter body 100, the medium pipeline 101 and the vacuum pipeline 102 are all tubular components and the latter two are sleeved inside the former.

[0043] In this embodiment, the catheter body 100 also has a heat insulation function, which may be implemented in two ways. One is that the vacuum pipeline 102 is formed into the catheter body 100 as described above, so as to utilize the vacuum pipeline 102 for heat insulation. The other is that the specially arranged catheter body 100 as described above is made of a heat insulation material or its outer surface is wrapped with a heat insulation material, so that the catheter body 100 has a heat insulation function to avoid unnecessary frostbite of the low-temperature medium flowing through the medium pipeline 101.

[0044] On the outer wall of the catheter body 100, there is provided an air extraction platform 110 protruding relative to the spray component 103. The air extraction platform 110 is formed with an air extraction surface 111 on the side facing the spray component 103. The air extraction surface 111 can be composed of an inclined surface. The air extraction port 112 is provided through the air extraction surface 111. One end of the air extraction pipeline 117 is connected to the air extraction port 112, and the other end is used to connect to the air extraction device, so as to achieve the purpose of exhausting gas. The air extraction port 112 is provided on the air extraction surface 111 facing the spray component 103, so that the air extraction port 112 is not easy to be blocked during use, and the gas can be smoothly extracted through the air extraction port 112.

[0045] In this embodiment, an air extraction platform 110 is provided on the duct body 100 at an appropriate position away from the spray component 103, and an air extraction port 112 is provided through the air extraction platform 110; the air extraction platform 110 has a first diameter portion 114, a second diameter portion 115, and a platform body 116 connected therebetween, the first diameter portion 114 is smaller than the second diameter portion 115, for example, when the air extraction platform 110 is a circular cross-section structure, the diameter of the first diameter portion 114 is smaller than the diameter of the second diameter portion 115, the platform body 116 includes an inclined surface or a curved surface to connect between the first diameter portion 114 and the second diameter portion 115, and the air extraction port 112 is provided through the platform body 116 to connect the air extraction cavity 113 of the air extraction platform 110 with the outside. Among them, the platform body 116 is formed as an air extraction surface 111.

[0046] Preferably, if Figure 2-3As shown, the vacuum table 110 is composed of a tubular component, which has a first diameter portion 114 with a smaller diameter, a second diameter portion 115 with a larger diameter, and a table body 116 composed of a conical surface and connected between the first diameter portion 114 and the second diameter portion 115, and the vacuum port 112 is arranged on the table body 116; and the size of the first diameter portion 114 matches the catheter body 100 so that it can form a sealed connection with the outer wall of the catheter body 100 after assembly.

[0047] like Figure 1 As shown, in this embodiment, the spray component 103 and the medium pipeline 101 have almost the same outer diameter size, so that the second diameter portion 115 of the exhaust platform 110 is arranged to protrude radially from the spray component 103 and the exhaust port 112 is arranged toward the spray component 103 to facilitate exhaust.

[0048] In this embodiment, the distance between the suction table 110 and the spray component 103 can be 0.5-20 cm, and the suction port 112 is elliptical and distributed along the table body 116. Of course, in other embodiments, the shape and location of the suction port 112 can also be set separately as needed, such as various shapes such as circular, fan-shaped, rectangular, annular, or a combination thereof. Preferably, as Figure 3 As shown, the air suction port 112 is axially penetrated on the platform body 116 so as to make the air flow through the air suction port 112 smoother.

[0049] like Figure 4 As shown in a-4d, in other embodiments, the shape of the air outlet 112 can be changed while the overall shape and setting position of the exhaust table 110 remain basically unchanged. For example, the air outlet 112 can be set to have 3 or 6 elongated hole portions along the circumferential direction, and the air outlet 112 can also be partially extended to the second diameter portion 115, so that the ventilation area of ​​the air outlet 112 is different to meet the needs of various scenes.

[0050] In addition, the shape of the exhaust surface 111 of the exhaust table 110 can be specifically designed as needed, for example, it can be a conical surface, an arcuate surface or a group of planes; among them, the exhaust surface 111 of the truncated cone-shaped table body 116 is a conical surface shape, and the exhaust surface 111 of the prism-shaped table body 116 is a group of planes. By replacing the conical surface with an arcuate surface on the basis of the truncated cone shape, an exhaust surface 111 with an arcuate surface shape can be obtained.

[0051] In this embodiment, the size of the suction port 112 provided on the suction table 110 is fixed, so that its discharge speed is relatively determined. In other embodiments, a sheath tube that can be movably provided in the axial direction or circumferential direction relative to the suction table 110 can also be provided. The suction table 110 is fixedly provided and the sheath tube is movably provided in the axial direction or rotatably provided relative to the suction table 110, so that the number or size of the suction ports 112 for the suction operation can be changed by covering the suction port 112 of the suction table 110 with the sheath tube, thereby realizing the function of adjustable suction power. The axial displacement movement or circumferential rotation of the sheath tube can be manually driven or electrically driven.

[0052] The vacuum spray cryoablation catheter of this embodiment, on the one hand, has the functions and required structure of a spray cryoablation catheter, and its implementation method can also be replaced by an existing spray cryoablation catheter. On the other hand, by providing a vacuum table 110 to perform vacuum operation at an appropriate distance from the spray port, the vaporized cryogenic medium can be discharged from the body and the residual gas amount in the body can be effectively controlled, and this process does not affect the implementation of the original spray cryoablation function.

[0053] Embodiment 2

[0054] like Figure 5 As shown in a-5b, in this embodiment, the catheter body 100 is a three-layer pipeline and is concentrically sleeved; the outer layer pipeline 121 is an air extraction layer, which is used to extract the vaporized medium after cryoablation; the middle layer pipeline 122 is a vacuum layer, which is used for heat insulation; the inner layer pipeline 123 is a medium pipeline, which is used to input the cryoablation medium. An annular gap is formed between the outer layer pipeline 121 and the middle layer pipeline 122, and three air extraction pipelines 117 are evenly distributed in it along the circumference, respectively constituting a first air extraction pipeline 1171, a second air extraction pipeline 1172 and a third air extraction pipeline 1173, and the two ends of each air extraction pipeline 117 are respectively connected to the air extraction cavity 113 of the air extraction table 110 and the air extraction device to realize air extraction; the medium pipeline 101 is sleeved in the inner layer pipeline 123, and the vacuum pipeline 102 is arranged between the middle layer pipeline 112 and the inner layer pipeline 123.

[0055] In this embodiment, the risk of overall function loss caused by blockage failure of the air extraction pipeline 117 that may occur when a single air extraction pipeline 117 is used is reduced by increasing the number of air extraction pipelines 117 .

[0056] In other embodiments, the exhaust pipeline 117 is composed of a plurality of pipelines arranged along the outer wall of the catheter body 100. At this time, the exhaust table 110 is sealedly connected to the outer wall of the catheter body 100 at the first diameter portion 114 and the second diameter portion 115, and one end of the pipeline arranged along the outer wall of the catheter body 100 to form the exhaust pipeline 117 is connected to the exhaust cavity 113 of the exhaust table 110, and the other end is connected to the exhaust device. Alternatively, the vacuum pipeline can be coated on the outer layer of the exhaust pipeline.

[0057] Embodiment 3

[0058] like Figure 6 As shown, a vacuum spray cryoablation catheter also includes a temperature control module 201 and a heating component 202. The vacuum table 110 is made of a heat-conducting material, such as metal. The heating component 202 is arranged in the vacuum cavity 113. For example, the heating component 202 is connected to the vacuum table 110, so that the vacuum table 110 is heated by the heating component 202 to heat the extracted gas to increase its temperature. The temperature control module 201 is electrically connected to the heating component 202 via the vacuum pipeline 117 (or the gap layer between the outer pipeline 121 and the middle pipeline 122) to control its heating function (that is, the electrical connection line of the temperature control module 201 is arranged in the vacuum pipeline 117 or the gap layer), so that the low-temperature medium gas passing through the cross-section is heated, thereby avoiding the hidden danger of the low-temperature medium gas encountering foreign matter (sputum, blood clots, etc.) freezing the vacuum channel, so that the medium gas can be smoothly discharged from the body.

Claims

1. An air-suction spray cryoablation catheter, comprising a catheter body (100), wherein the catheter body (100) comprises a medium pipeline (101) and a vacuum pipeline (102), and a spray component (103) is connected to the medium pipeline (101); characterized in that: An exhaust platform (110) is sleeved on the outer wall of the catheter body (100), and an exhaust surface (111) is formed on the exhaust platform (110) facing the spray component (103). An exhaust port (112) is provided through the exhaust surface (111), and one end of an exhaust pipeline (117) is connected to the exhaust port (112), and the other end is used to be connected to an exhaust device.

2. The vacuum spray cryoablation catheter according to claim 1, characterized in that: The vacuum table (110) is a circular ring-shaped component and is sleeved on the outer wall of the catheter body (100); the vacuum table (110) includes a first diameter portion (114), a second diameter portion (115) and a table body (116) connected therebetween, so as to form a vacuum cavity (113) in the vacuum table (110) that is connected to the vacuum port (112); the size of the first diameter portion (114) is smaller than that of the second diameter portion (115).

3. The vacuum spray cryoablation catheter according to claim 2, characterized in that: The platform body (116) is a conical structure.

4. The vacuum spray cryoablation catheter according to claim 3, characterized in that: The first diameter portion (114) and the second diameter portion (115) are both cylindrical portions.

5. The vacuum spray cryoablation catheter according to claim 4, characterized in that: The number of the air extraction pipelines (117) is one or more and they are connected to the air extraction port (112) via the air extraction cavity (113).

6. The vacuum spray cryoablation catheter according to any one of claims 1 to 5, characterized in that: The air extraction surface (111) is convexly arranged relative to the spray component (103), and the air extraction port (112) is arranged toward the spray component (103). The air extraction port (112) is arranged to penetrate along the axial direction.

7. The vacuum spray cryoablation catheter according to any one of claims 2 to 5, characterized in that: It also includes a temperature control module (201) and a heating component (202); the vacuum table (110) is made of a heat-conducting material, and the heating component (202) is arranged in the vacuum cavity (113).

8. The vacuum spray cryoablation catheter according to any one of claims 1 to 5, characterized in that: It also includes a sheath tube movably arranged in the axial or circumferential direction relative to the suction platform (110), and the number or size of the suction ports (112) for suction is changed by covering the suction ports (112) with the sheath tube to adjust the suction power.

9. The vacuum spray cryoablation catheter according to any one of claims 1 to 5, characterized in that: The catheter body (100) is a three-layer pipeline, which is concentrically arranged; the outer layer of the pipeline is an air extraction layer, which is used to extract the vaporized medium after cryoablation; the middle layer of the pipeline is a vacuum layer, which is used for heat insulation; and the inner layer of the pipeline is a medium pipeline, which is used to input the cryoablation medium.

10. The vacuum spray cryoablation catheter according to claim 9, characterized in that: The suction port (112) of the suction table (110) is circular, elliptical, fan-shaped, rectangular, annular or a combination of shapes thereof. The air extraction surface (111) is in the shape of a conical surface, a curved surface or a group of plane surfaces.

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