Ablation catheter capable of simultaneously injecting liquid and ablating

Abstract

The utility model belongs to the technical field of medical instrument ablation, and provides an ablation catheter capable of simultaneously injecting liquid and ablating, which comprises a conveying sheathing canal, a first channel, a second channel and a second channel, the ablation electrode is provided with a first cavity, the ablation electrode is arranged at the far end of the conveying sheath tube, the ablation electrode can be configured with ablation energy, the ablation electrode is provided with a plurality of first notches distributed at intervals in the length direction of the ablation electrode, and the first notches communicate with the first cavity; the shunt tube is arranged in the first cavity of the ablation electrode, the shunt tube is provided with a diversion cavity, one end of the diversion cavity is communicated with the first channel, the shunt tube is provided with a plurality of shunt holes distributed at intervals in the length direction of the shunt tube, the shunt holes are communicated with the first cavity of the ablation electrode and the diversion cavity, and the shunt holes correspond to the first notches in position. By the adoption of the structure, uniform circulation of injection can be achieved, the current conduction rate is increased, and the ablation efficiency is further improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the medical instrument ablation technical field, especially a kind of ablation catheter capable of simultaneously injecting liquid and ablation. BACKGROUND

[0002] Tumor is one of common diseases, for the treatment of tumor, when tumor tissue is larger, surgical resection is generally used, when tumor tissue is smaller, under existing medical conditions, radiofrequency ablation or pulse ablation is generally used to remove tumor tissue.

[0003] Pulse electric field ablation refers to the application of intermittent high-intensity pulse electric field in a very short time, causing irreversible damage to cell membrane electroporation, so that tumor cell membrane is broken, causing natural apoptosis of tumor cells.

[0004] Experiments show that when pulse electric field ablation is carried out, the conduction rate of current will affect the ablation effect, and the higher the conduction rate of current, the better the ablation effect. Therefore, how to improve the conduction rate of current during ablation is a problem that needs to be solved by those skilled in the art. UTILITY MODEL CONTENT

[0005] In order to solve the technical problems in the above background, the utility model provides an ablation catheter capable of simultaneously injecting liquid and ablation, which solves the problem of low current conduction rate and low ablation efficiency during ablation in the above background.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] An ablation catheter capable of simultaneously injecting liquid and ablation, comprising:

[0008] A delivery sheath tube is provided with a first channel through both ends, and the delivery sheath tube has a distal end and a proximal end;

[0009] An ablation electrode is provided with a first cavity, and the ablation electrode is arranged at the distal end of the delivery sheath tube, the ablation electrode can be configured with ablation energy, and a plurality of first notches are arranged on the ablation electrode along the length direction, and the plurality of first notches are connected with the first cavity;

[0010] A shunt pipe is arranged in the first cavity of the ablation electrode, and the shunt pipe is provided with a flow guide cavity, and one end of the flow guide cavity is connected with the first channel, wherein a plurality of shunt holes are arranged on the shunt pipe along the length direction, and the plurality of shunt holes are connected with the first cavity of the ablation electrode and the flow guide cavity, and the shunt holes correspond to the positions of the first notches.

[0011] In some embodiments, the ablation electrode and the delivery sheath are integrally formed as a metal tube, and the delivery sheath is coaxially arranged with the ablation electrode, wherein the delivery sheath is provided with a first insulating layer.

[0012] In some embodiments, the ablation electrode is provided with a first opening at a side away from the delivery sheath, and the first opening is in communication with the first cavity of the ablation electrode.

[0013] In some embodiments, the shunt is in abutment and sealed with the inner wall of the ablation electrode at a side close to the delivery sheath, and the shunt is sealed with the first opening at a side away from the delivery sheath, wherein a segment of the shunt provided with the shunt hole is provided with a preset gap between the inner wall of the first cavity of the ablation electrode.

[0014] In some embodiments, the ablation electrode is provided with a first inclined surface at a side away from the delivery sheath, and the first inclined surface constitutes a puncture needle tip.

[0015] In some embodiments, the shunt is made of plastic material, and the shunt is provided with a second inclined surface at a side away from the delivery sheath, and the second inclined surface is coplanar with the first inclined surface.

[0016] In some embodiments, a plurality of the first notches are uniformly distributed along the length direction of the ablation electrode, and a plurality of the first notches are uniformly distributed along the axial direction of the ablation electrode.

[0017] In some embodiments, the flow cross-sectional area of the first notch gradually increases from a side of the ablation electrode away from the delivery sheath to a side of the ablation electrode close to the delivery sheath.

[0018] In some embodiments, the ablation electrode is sequentially divided into a first segment, a second segment and a third segment along the axial line of the ablation electrode, the first segment of the ablation electrode is arranged away from the delivery sheath, and the third segment of the ablation electrode is arranged close to the delivery sheath, wherein the flow cross-sectional area of the first notch located on the same segment of the ablation electrode is the same.

[0019] In some embodiments, the shunt hole is arranged on the shunt in sections, and the position of the shunt hole corresponds to the position of the first notch on the first segment, the second segment and the third segment of the ablation electrode.

[0020] In some embodiments, an operation handle is further included, the proximal end of the delivery sheath is fixed on the operation handle, the operation handle is provided with a liquid injection connector, and one end of the liquid injection connector located in the operation handle is connected with the proximal end of the delivery sheath.

[0021] In some embodiments, the operation handle further comprises a connecting plug located outside the operation handle and an energy delivery wire located inside the operation handle, wherein the delivery sheath tube part is exposed, one end of the energy delivery wire is connected with the exposed part of the delivery sheath tube, and the other end of the energy delivery wire is connected with the connecting plug.

[0022] Compared with the prior art, the utility model brings the beneficial effects that:

[0023] The first cavity is arranged in the inside of the ablation electrode, the plurality of first notches are arranged on the ablation electrode and distributed along the axial direction of the ablation electrode, the shunt pipe is arranged in the first cavity, the shunt pipe comprises a flow guide cavity and a plurality of shunt holes distributed along the axial direction of the shunt pipe, and the positions of the shunt holes correspond to the positions of the first notches, the pre-physiological saline body is subjected to secondary shunting by arranging the shunt pipe in the inside of the ablation electrode, so that the pre-physiological saline body can uniformly flow out from the plurality of first notches, the pre-physiological saline is prevented from flowing out from a certain part, and therefore the conductivity of the contact between the ablation electrode and the human tissue is improved, and the ablation efficiency is improved.

[0024] Additional aspects and advantages of the application will be set forth in part in the following description, and will be apparent from the description, or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a perspective view of an ablation catheter capable of simultaneously injecting and ablation of the utility model;

[0026] Figure 2 It is Figure 1 The enlarged view of A in the middle;

[0027] Figure 3 It is Figure 2 The sectional view of the ablation electrode part in the middle;

[0028] Figure 4 It is a schematic view of the internal structure of the ablation electrode of the utility model;

[0029] Figure 5 It is a perspective view of the shunt pipe of the utility model;

[0030] Figure 6 It is a schematic view of the internal structure of the shunt pipe of the utility model;

[0031] Figure 7 It is a schematic view of the internal structure of the operation handle of the utility model;

[0032] Figure 8 It is a schematic view of the structure of injecting physiological saline by the ablation electrode applied to an ablation handle of the utility model;

[0033] Figure 9 For Figure 8 Schematic diagram of structure for ablation after injection of physiological saline. DETAILED DESCRIPTION

[0034] The application will be further described below in conjunction with specific drawings. In the description of the embodiments, unless otherwise stated, the terms "left", "right", and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the application must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0035] In one embodiment, as Figures 2-3 shown, the ablation catheter capable of simultaneous injection and ablation provided by the utility model mainly comprises a delivery sheath tube 200, which is provided with a first channel 203 penetrating through both ends of the delivery sheath tube 200, and the delivery sheath tube 200 has a distal end and a proximal end. In the embodiment, the delivery sheath tube 200 can be a flexible structure cooperating with an endoscope to enter the inside of a human body cavity for ablation, or the delivery sheath tube 200 can be a rigid structure, which can directly perform extracorporeal puncture ablation. When the delivery sheath tube 200 is a flexible pipe, it can be made of PEEK, PTFE, PA or the like.

[0036] The ablation electrode 201, as Figure 4 shown, is arranged at the distal end of the delivery sheath tube 200, and the ablation electrode 201 is a hollow structure provided with a first cavity 2014. The ablation electrode 201 can be configured with external ablation energy. In the embodiment, the ablation electrode 201 can be configured with radiofrequency ablation energy or pulse ablation energy. It should be particularly pointed out that the ablation electrode 201 is provided with a plurality of first notches 2015 distributed at intervals in the length direction of the ablation electrode 201, and the plurality of first notches 2015 are arranged on the side wall of the ablation electrode 201 and communicate with the first cavity 2014. In the embodiment, the ablation electrode 201 is a columnar structure, and the length direction is the axial direction of the ablation electrode 201.

[0037] The shunt pipe 300 is arranged in the first cavity 2014 of the ablation electrode 201, as Figure 5 and Figure 6 shown, the shunt pipe 300 is provided with a flow guide cavity 301, one end of the flow guide cavity 301 communicates with the first channel 203 of the delivery sheath tube 200,

[0038] 203 flow to the shunt pipe 300 guide cavity 301, wherein the side wall of the guide pipe 300 is provided with a plurality of shunt holes 302 which are axially spaced apart, the shunt hole 302 is communicated with the guide cavity and the first cavity 2014, so that the physiological saline enters the first cavity 2014 from the shunt hole 302, the position of the plurality of shunt holes 302 corresponds to the position of the plurality of first notches 2015. In this embodiment, the shunt pipe 300 is closed away from the delivery sheath pipe 200, so that the physiological saline only flows out of the shunt hole to the first cavity.

[0039] The utility model discloses a shunt pipe 300 is arranged in the first cavity 2014 of ablation electrode 201, and the shunt hole 302 corresponding to the position of the first notch 2015 on the ablation electrode 201 is arranged on the shunt pipe 300, so that the physiological saline can flow to the human tissue through the first notch 2015 evenly, when pulse ablation is used, the conduction rate of current can be improved by injecting physiological saline, the electric field is more stable, the ablation effect is better, and the ablation efficiency is improved.

[0040] In one embodiment, in order to simplify the manufacturing and assembly process of the ablation catheter, it is directly used for external puncture ablation, the delivery sheath pipe 200 and the ablation electrode 201 are integrated, that is, the delivery sheath pipe 200 and the ablation electrode 201 are made of conductive metal pipe material, for example, stainless steel material or titanium alloy. The ablation electrode 201 and the delivery sheath 200 are coaxially arranged, which is convenient for external puncture, when the delivery sheath pipe 200 is made of metal material, the first insulating layer 202 is arranged on the outer side of the delivery sheath pipe 200, and the distal end part of the delivery sheath pipe 200 is exposed to form the ablation electrode 201. In this embodiment, the first insulating layer 202 can be formed by coating the delivery sheath pipe 200 made of metal material with a polyimide insulating material.

[0041] In one embodiment, in order to facilitate the installation and assembly of the shunt pipe 300, the first opening is arranged on the side of the ablation electrode 201 away from the delivery sheath pipe 200, the first opening is communicated with the first cavity 2014, the shunt pipe 300 is assembled into the first cavity 2014 of the ablation electrode 201 through the first opening, the shape of the first opening is matched with the shape of the shunt pipe 300, and in this embodiment, the first opening and the first cavity 2014 are both cylindrical. Alternatively, the first opening and the first cavity 2014 can also be prismatic, and it should be known that the shape of the first opening and the first cavity 2014 is not controlled by the utility model.

[0042] In one embodiment, the shunt pipe 300 abuts against the inner wall of the ablation electrode 201 near one end of the delivery sheath pipe 200, seals the contact between the ablation electrode 201 and the shunt pipe 300, and seals the first opening away from the other end of the delivery sheath pipe 200, so that the physiological saline only flows from the first channel 203 to the guide cavity 301, then through the shunt hole 302 to the first cavity 2014, and finally through the first slot 2015 to the human tissue, achieving uniform physiological saline outflow. It should be noted that a predetermined gap is provided between the section of the shunt pipe 300 provided with the shunt hole 302 and the inner wall of the first cavity 2014 of the ablation electrode 201, so that the physiological saline flows and avoids the ablation electrode 201 first cavity 2014 inner wall abutting and plugging the shunt hole 302. In this embodiment, the diameter of the shunt pipe 300 at both ends is greater than the diameter of the section provided with the shunt hole 302, so that a predetermined gap is formed between the outer wall of the shunt pipe 300 and the inner wall of the first cavity 2014 of the ablation electrode 201. Alternatively, the inner diameter of the first cavity 2014 of the ablation electrode 201 at the position corresponding to the shunt pipe 300 provided with the shunt hole 302 can also be increased to achieve the predetermined gap. In this embodiment, the two ends of the shunt pipe 300 are fixed by interference fit and then glued, or the first opening is welded to fix the shunt pipe 300 at the first opening of the ablation electrode 201.

[0043] Further, referring again to Figure 2 and Figure 4 , in order to achieve direct external puncture, a first inclined surface 2016 is arranged at the end of the ablation electrode 201 away from the delivery sheath pipe 200, the first inclined surface 2016 is obliquely cut on the tubular ablation electrode 201, thereby forming a puncture needle tip 2017, which can be used for external puncture ablation. Alternatively, the puncture needle tip 2017 can also be formed by multiple first inclined surfaces 2016 staggered.

[0044] Further, in order to ensure the smoothness of the puncture needle tip 2017 of the ablation electrode 201, a second inclined surface 303 is arranged at the end of the shunt pipe 300 away from the delivery sheath pipe 200, that is, the shunt pipe 300 is fixed at the first opening of the ablation electrode 201, the second inclined surface 303 is coplanar with the first inclined surface 2016, thereby making the structure of the puncture needle tip 2017 of the ablation electrode 201 smooth, reducing the resistance in the puncture process and the damage to normal human tissues. Alternatively, the end of the shunt pipe 300 close to the puncture needle tip 207 can also be a non-coplanar structure, such as a round head structure or other columnar structure, which is fixed by filling with glue. Further, due to the small size of the shunt pipe 300, metal materials are not conducive to processing, in order to facilitate processing and manufacturing, the shunt pipe 300 is made of plastic material by mold opening.

[0045] In one embodiment, the plurality of first slots 2015 are evenly distributed along the length of the ablation electrode 201 and evenly distributed around the axis of the ablation electrode 201. By adopting the above structure, the uniformity of the physiological saline flowing out of the first slots 2015 is further ensured. In this embodiment, the first slots 2015 are in a spiral distribution, and alternatively, the first slots 2015 can also be in a ring distribution.

[0046] In one embodiment, the flow cross-sectional area of the first slots 2015 near the puncture needle tip 2017 of the ablation electrode 201 is smaller than the flow cross-sectional area of the first slots 2015 near the delivery sheath 200, and the flow cross-sectional area of the first slots 2015 gradually increases from the puncture needle tip 2017 of the ablation electrode 201 to the end of the delivery sheath 200.

[0047] Further, as shown in the drawings, Figure 4 The ablation electrode 201 is sequentially distributed along its axis as a first section 2011, a second section 2012, and a third section 2013. The first section 2011 of the ablation electrode 201 is away from the delivery sheath 200, the third section 2013 of the ablation electrode 201 is close to the delivery sheath 200, and the second section 2012 of the ablation electrode 201 is between the first section 2011 and the third section 2013. The flow cross-sectional area of the first slots 2015 on the same section of the ablation electrode 201 is the same. Since the physiological saline flows out of the first slots 2015 of the first section 2011 of the ablation electrode 201 at a large speed and a large flow rate, and the flow pressure of the second section 2012 and the third section 2013 of the ablation electrode 201 is small, the flow rate decreases slowly, the flow cross-sectional area of the first slots 2015 of the second section 2012 and the third section 2013 is sequentially increased, thereby ensuring the uniform flow rate to achieve uniform physiological saline outflow. In this embodiment, the first slots 2015 are in a rectangular structure, and alternatively, the first slots 2015 can also be in a circular hole or a prism, etc.

[0048] Further, the shunt holes 302 are segmentally arranged on the shunt pipe 300, and the shunt holes 302 correspond to the positions of the first slots 2015 on the first section 2011, the second section 2012, and the third section 2013 of the ablation electrode 201. Specifically, in this embodiment, the shunt holes 302 are circular holes and are evenly distributed in four directions around the axis of the shunt pipe 300. Since the shunt pipe 300 has a small diameter, the shunt holes 302 are arranged in pairs, and the center axes of each pair of shunt holes 302 are coaxial. The shunt holes 302 in each pair are arranged at intervals, thereby ensuring that the physiological saline flows uniformly from the flow guide cavity 301 to the first cavity 2014 of the ablation electrode 201. It can be known that the shape of the shunt holes 302 is not limited by the present application.

[0049] In one embodiment, as shown in the drawings,Figure 1 and Figure 7 As shown in the figure, the ablation catheter further comprises an operation handle 100, and a proximal end of the delivery sheath 200 is fixed on the operation handle 100. An injection communication device 101 is arranged on the operation handle 100, and the injection communication device 101 is connected with the delivery sheath 200 at one end inside the operation handle 100 and communicates with the first channel 203. The operator can realize injection of physiological saline by connecting a syringe to the injection communication device 101.

[0050] Further, an energy delivery wire 102 inside the operation handle 100 is further included, and the energy delivery wire 102 is used for transmission of ablation energy. In the embodiment, the delivery sheath 200 is made of a metal pipe, and the delivery sheath 200 is exposed inside the operation handle 100, and an electrode ring 103 is arranged on the exposed part, one end of the energy delivery wire 102 is connected with the electrode ring 103, and the structure of the connection point can be effectively avoided to be unstable or to cause virtual connection, and the other end of the energy delivery wire 102 is connected with a connection plug 104 which is used for plugging with an external energy generator.

[0051] Optionally, when the delivery sheath 200 is a flexible hose, one end of the energy delivery wire 102 can be directly connected with the ablation electrode 201 through the first channel 203 or a metal braided wire is arranged inside the delivery sheath 200, and the energy delivery wire 102 is connected with the ablation electrode 201 through the metal braided wire, so as to realize transmission of ablation energy.

[0052] As shown in the figure, Figure 8 and Figure 9 As shown in the figure, the ablation electrode 201 of the utility model is applied to the structure of the ablation handle, Figure 8 that is, injection of physiological saline before ablation, Figure 9 the ablation needle is inserted into the first channel 203 after injection of the physiological saline, and ablation operation is performed.

[0053] The above description is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled in the art, without departing from the principle of the utility model, a number of improvements and refinements can be made. These improvements and refinements should also be regarded as the protection scope of the utility model.

Claims

1. An ablation catheter capable of simultaneous injection and ablation, characterized in that: include: The delivery sheath is provided with a first channel running through both ends of the delivery sheath, and the delivery sheath has a distal end and a proximal end; an ablation electrode having a first cavity, the ablation electrode being disposed at the distal end of the delivery sheath, the ablation electrode being capable of being configured with ablation energy, the ablation electrode being provided with a plurality of first notches spaced apart along its length, the plurality of first notches being connected to the first cavity; A shunt tube is arranged in the first cavity of the ablation electrode. The shunt tube is provided with a guide cavity. One end of the guide cavity is connected to the first channel. The shunt tube is provided with a plurality of shunt holes spaced apart along its length. The plurality of shunt holes connect the first cavity of the ablation electrode and the guide cavity. The shunt holes correspond to the position of the first slot.

2. The ablation catheter capable of simultaneous injection and ablation according to claim 1, characterized in that: The ablation electrode and the delivery sheath are integrally constructed as metal pipes. The delivery sheath and the ablation electrode are coaxially arranged, wherein a first insulating layer is provided on the delivery sheath.

3. The ablation catheter capable of simultaneous injection and ablation according to claim 2, characterized in that: The ablation electrode is provided with a first opening at one end away from the delivery sheath, and the first opening is connected to the first cavity of the ablation electrode.

4. The ablation catheter capable of simultaneous injection and ablation according to claim 3, characterized in that: The end of the shunt tube close to the delivery sheath abuts and seals against the inner wall of the ablation electrode, and the end of the shunt tube away from the delivery sheath seals the first opening, wherein a preset gap is provided between a section of the shunt tube with a shunt hole and the inner wall of the first cavity of the ablation electrode.

5. The ablation catheter capable of simultaneous injection and ablation according to claim 4, characterized in that: The ablation electrode has a first inclined surface at one end away from the delivery sheath, and the first inclined surface constitutes a puncture needle tip.

6. The ablation catheter capable of simultaneous injection and ablation according to claim 5, characterized in that: The shunt tube is made of plastic material. An end of the shunt tube away from the delivery sheath is provided with a second inclined surface, and the second inclined surface is coplanar with the first inclined surface.

7. The ablation catheter capable of simultaneous injection and ablation according to claim 1, characterized in that: The plurality of first notches are evenly distributed along the length direction of the ablation electrode, and the plurality of first notches are evenly distributed around the axis direction of the ablation electrode.

8. The ablation catheter capable of simultaneous injection and ablation according to claim 1, characterized in that: The flow cross-sectional area of ​​the first notch gradually increases from an end of the ablation electrode away from the delivery sheath to an end of the ablation electrode close to the delivery sheath.

9. The ablation catheter capable of simultaneous injection and ablation according to claim 8, characterized in that: The ablation electrode is divided into a first section, a second section and a third section along its own axis. The first section of the ablation electrode is arranged away from the delivery sheath, and the third section of the ablation electrode is arranged close to the delivery sheath, wherein the flow cross-sectional areas of the first notches located in the same section on the ablation electrode are the same.

10. The ablation catheter capable of simultaneous injection and ablation according to claim 9, characterized in that: The diversion holes are segmented and arranged on the diversion tube. The positions of the diversion holes correspond to the positions of the first notches of the first section, the second section and the third section on the ablation electrode.

11. The ablation catheter capable of simultaneous injection and ablation according to claim 2, characterized in that: It also includes an operating handle, the proximal end of the delivery sheath is fixed on the operating handle, and the operating handle is provided with an injection connector, one end of the injection connector located in the operating handle is connected to the proximal end of the delivery sheath.

12. The ablation catheter capable of simultaneous injection and ablation according to claim 11, characterized in that: The operating handle also includes a connecting plug located outside the operating handle and an energy delivery wire located inside the operating handle, wherein the delivery sheath is partially exposed, one end of the energy delivery wire is connected to the exposed portion of the delivery sheath, and the other end of the energy delivery wire is connected to the connecting plug.

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