Ablation needle with suction structure
By introducing a spiral flow guide groove and a flow limiting hole structure into the ablation needle, the problem of uneven cooling is solved, achieving efficient cooling and improved safety of the ablation needle.
Patent Information
- Application Number
- CN202522825370.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-12-31
AI Technical Summary
The cooling system of existing ablation needles is inefficient, especially in the needle tip and cable end area where the cooling is uneven, which poses a risk of local overheating and affects the ablation effect and safety.
A suction-structured ablation needle was designed, employing a spiral guide groove and a multi-stage flow-limiting hole structure. The coolant flows through the spiral channel and is diverted at the flow-limiting plate to ensure uniform coolant distribution and avoid local overheating.
It improves cooling efficiency, ensures uniform cooling of the needle tip and cable end area, reduces the risk of local overheating, and enhances the stability and safety of the ablation process.
Smart Images
Figure CN223886959U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to interventional surgical instrument technical field, concretely relates to a suction structure ablation needle. BACKGROUND
[0002] The heat ablation technology is an important method in the field of tumor interventional treatment, which punctures the ablation needle to the target tissue through the skin, and uses the energy form such as radio frequency, microwave or laser to make the local tissue coagulation necrosis, so as to achieve the purpose of inactivating the tumor. The technology has the advantages of minimally invasive, safe and strong repeatability, and has been widely used.
[0003] In the ablation process, the needle tip and energy transmission unit of the ablation needle will generate a large amount of heat. If the heat cannot be dissipated in time, the tissue near the needle tip will be over carbonized or even adhered, which will not only increase the needle pulling resistance and the pain of the patient, but also seriously affect the control of the ablation range due to the high impedance or abnormal energy scattering, resulting in tumor residue or excessive damage to the surrounding normal tissue. Therefore, the modern ablation needle is usually integrated with an internal circulation cooling system, which passes cooling liquid (such as physiological saline) between the outer sleeve and the inner sleeve to take away excess heat and ensure the stability and safety of the ablation process.
[0004] However, such a cooling flow channel design still has obvious limitations. First, when the cooling liquid flows through the screw gap between the outer sleeve and the inner sleeve, its main function is to cool the sleeve wall, and the cooling of the core heating component, i.e. the ablation energy transmission cable itself, is indirect conduction, and the efficiency is relatively low. Secondly, the cooling liquid finally needs to be diverted in the buffer space at the needle tip, and the cooling liquid is easy to stay at the needle tip during the diversion process, and the cooling of the needle tip and the cable end area which need heat dissipation most is uneven, and there is a risk of local overheating. UTILITY MODEL CONTENTS
[0005] In view of the above problems, the application discloses a suction structure ablation needle.
[0006] A suction structure ablation needle, which comprises a holding part, a cooling part and an ablation part; the holding part is connected with the cooling part; the cooling part comprises an outer sheath tube and an inner sheath tube; the outer sheath tube is wrapped outside the inner sheath tube; the ablation part enters the inside of the inner sheath tube after passing through the holding part; a spiral flow guide groove is arranged on the inner wall of the inner sheath tube; a first flow guide ring is arranged outside the inner sheath tube; the inner wall of the first flow guide ring is fixedly connected with the inner sheath tube, and the outer wall abuts against the outer sheath tube; the first flow guide ring has a first flow guide hole; a flow limiting plate is fixedly connected to the end of the inner sheath tube away from the holding part; the two sides of the flow limiting plate abut against the inner wall of the outer sheath tube; there is a gap between the end of the flow limiting plate away from the holding part and the inner wall of the outer sheath tube; the first flow guide hole is located in the direction away from the ablation part.
[0007] Further, the holding part is provided with a water outlet port and a water inlet port; the water outlet port is communicated with the outer sheath tube; the water inlet port is communicated with the inner sheath tube.
[0008] Further, the water outlet port is communicated with the outer sheath tube through a first drainage tube; the water inlet port is communicated with the inner sheath tube through a second drainage tube; the outer part of the first drainage tube is wrapped with a first sealing ring; the outer part of the second drainage tube is wrapped with a second sealing ring.
[0009] Further, a second flow guide ring is further included; the inner wall of the second flow guide ring is fixedly connected with the inner sheath tube, and the outer wall is abutted with the outer sheath tube; the second flow guide ring is provided with a second flow guide hole; the second flow guide ring is located in the direction away from the flow limiting plate of the first flow guide ring.
[0010] Further, the distance between the axis of the second flow guide hole and the axis of the first flow guide hole is a; the radius of the first flow guide hole is b; the radius of the second flow guide hole is c, and a > b + c.
[0011] Further, a third flow guide ring is further included; the inner wall of the third flow guide ring is fixedly connected with the inner sheath tube, and the outer wall is abutted with the outer sheath tube; the third flow guide ring is provided with a third flow guide hole; the third flow guide ring is located in the direction away from the flow limiting plate of the second flow guide ring.
[0012] Further, the distance between the axis of the third flow guide hole and the axis of the second flow guide hole is d; the radius of the second flow guide hole is c, and the radius of the third flow guide hole is e, and d > c + e.
[0013] Further, the holding part is provided with a working channel; the ablation part passes through the holding part through the working channel; the inside of the working channel is provided with a sealing ring.
[0014] Further, one end of the cooling part is inserted into the holding part; the side wall of the one end of the cooling part inserted into the holding part is wrapped with a sealing piece.
[0015] Further, the one end of the cooling part away from the holding part is gradually contracted.
[0016] The utility model discloses the beneficial effect:
[0017] The cooling liquid enters the gap between the inner sheath tube and the ablation part through the water inlet port, so that the cooling liquid flows along the spiral flow channel formed by the spiral flow guide plate, the residence time of the cooling liquid on the surface of the ablation part is prolonged, and the cooling efficiency is improved.
[0018] When the cooling liquid reaches the end of the spiral flow channel away from the holding part, the cooling liquid enters the space between the outer sheath and the inner sheath through the gap between the flow limiting plate and the inner wall of the outer sheath, so that the flow rate of the gap between the flow limiting plate and the inner wall of the outer sheath increases, and based on the common sense of physics, the area with high flow rate has low pressure, so that the cooling liquid is attracted to flow to the gap between the flow limiting plate and the inner wall of the outer sheath, so that the cooling liquid at the end of the spiral flow channel away from the holding part is in a flowing state, avoiding the cooling liquid staying at the end of the spiral flow channel away from the holding part, so that the needle tip and the cable end region are uniformly cooled, and local overheating is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is a perspective view of the suction structure ablation needle for realizing the utility model;
[0020] Figure 2 It is a front view of the suction structure ablation needle for realizing the utility model;
[0021] Figure 3 It is Figure 2 A-A sectional view;
[0022] Figure 4 It is Figure 3 A local enlarged view;
[0023] Figure 5 It is a sectional view of the water injection port and the water drainage port for realizing the utility model;
[0024] Figure 6 It is a perspective view of the inner sheath for realizing the utility model;
[0025] Figure 7 It is Figure 6 A local enlarged view;
[0026] Figure 8 It is a perspective view of another inner sheath for realizing the utility model;
[0027] Figure 9 It is Figure 8 A local enlarged view
[0028] In the figure, 1, holding part; 2, cooling part; 3, ablation part; 11, water drainage port; 12, water inlet port; 21, outer sheath; 22, inner sheath; 221, spiral flow guide plate; 222, flow limiting plate; 223, first flow guide ring; 224, second flow guide ring; 225, third flow guide ring; 226, first flow guide hole; 227, third flow guide hole. DETAILED DESCRIPTION
[0029] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with the specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.
[0030] In the present document, "schematic" means "serves as an example, instance or illustration", and any illustration, embodiment described as "schematic" in the present document should not be interpreted as a more preferred or more advantageous technical solution.
[0031] In order to make the drawings simple, only the parts related to the present application are schematically shown in the drawings, which do not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, in some drawings, only one of the parts with the same structure or function is schematically shown, or only one of them is marked.
[0032] In the present document, it should be understood that the terms "upper", "lower", "front", "back", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0033] In the present document, unless otherwise explicitly specified and limited, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" means two or more; the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integrally connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0034] As Figures 1-9 A suction structure ablation needle, as shown in the drawings, comprises a holding part 1, a cooling part 2 and an ablation part 3; the holding part 1 is connected with the cooling part 2; the cooling part 2 comprises an outer sheath tube 21 and an inner sheath tube 22; the outer sheath tube 21 is wrapped outside the inner sheath tube 22; the ablation part 3 enters the inside of the inner sheath tube 22 after passing through the holding part 1; a spiral flow guide groove is arranged on the inner wall of the inner sheath tube 22; the cooling liquid enters the gap between the inner sheath tube 22 and the ablation part 3, so that the cooling liquid flows along the spiral flow channel formed by the spiral flow guide plate 221, prolongs the residence time of the cooling liquid on the surface of the ablation part 3, and improves the cooling efficiency.
[0035] Specifically, the ablation part 3 is an ablation needle.
[0036] The outer part of the inner sheath tube 22 is provided with a first flow guide ring; the inner wall of the first flow guide ring is fixedly connected with the inner sheath tube 22, and the outer wall is in abutment with the inner wall of the outer sheath tube 21; the first flow guide ring is provided with a first flow guide hole 226; the end of the inner sheath tube 22 away from the holding part 1 is fixedly connected with a flow limiting plate 222; the two sides of the flow limiting plate 222 are in abutment with the inner wall of the outer sheath tube 21; and a gap exists between the end of the flow limiting plate 222 away from the holding part 1 and the inner wall of the outer sheath tube 21. The first flow guide hole 226 is located in the direction away from the ablation part 3 of the flow limiting plate 222.
[0037] After the cooling liquid reaches the end of the spiral flow channel away from the holding part 1, it enters between the outer sheath tube 21 and the inner sheath tube 22 through the gap between the flow limiting plate 222 and the inner wall of the outer sheath tube 21, so that the flow rate at the gap between the flow limiting plate 222 and the inner wall of the outer sheath tube 21 increases. According to the common sense of physics, the area with high flow rate has low pressure. Therefore, the cooling liquid will flow to the gap between the flow limiting plate 222 and the inner wall of the outer sheath tube 21, so that the cooling liquid at the end of the spiral flow channel away from the holding part 1 is in a flowing state, avoiding the cooling liquid from staying at the end of the spiral flow channel away from the holding part 1, so that the needle tip and the cable end region are uniformly cooled, avoiding local overheating.
[0038] The end of the cooling part 2 away from the holding part 1 is gradually tapered, so that the distal end of the cooling part 2 is sharp, facilitating puncture.
[0039] As shown in Figure 2 , the ablation part 3 is inserted through the end of the holding part 1 away from the cooling part 2. As shown in Figure 3 , the holding part 1 is provided with a working channel; the ablation part 3 passes through the holding part 1 through the working channel; and the inside of the working channel is provided with a sealing ring. The sealing ring blocks the gap between the working channel and the ablation part 3 to prevent the cooling liquid from leaking out.
[0040] Specifically, the sealing ring is made of soft polymer materials such as silica gel and rubber.
[0041] As shown in Figure 3 , one end of the cooling part 2 is inserted into the holding part 1; and a sealing member is wrapped on the side wall of the end of the cooling part 2 inserted into the holding part 1. The sealing member blocks the gap between the cooling part 2 and the holding part 1 to prevent the cooling liquid from leaking out.
[0042] Specifically, the sealing member is made of soft polymer materials such as silica gel and rubber.
[0043] As shown in Figure 3As shown, the holding part 1 is provided with a water outlet port 11 and a water inlet port 12; the water outlet port 11 is in communication with the outer sheath tube 21; the water inlet port 12 is in communication with the inner sheath tube 22. When in use, a water supply device is connected to the water inlet port 12, so that water can be continuously supplied to the inside of the cooling part 2; a collecting device is connected to the water outlet port 11, so that the cooling liquid overflowing from the water outlet port 11 can be collected.
[0044] Specifically, as shown in Figure 5 , the outer sheath tube 21 is provided with a water outlet hole. One end of the first drainage tube enters the outer sheath tube 21 through the water outlet hole, and the other end is connected to the water outlet port 11. The water outlet port 11 is in communication with the outer sheath tube 21 through the first drainage tube. The outside of the first drainage tube is wrapped with a first sealing ring; the first sealing ring seals the gap between the outer wall of the first drainage tube and the water outlet hole, so as to prevent the cooling liquid from leaking out.
[0045] The outer sheath tube 21 is provided with a first water inlet hole, and the inner sheath tube 22 is provided with a second water inlet hole. One end of the second drainage tube enters the inner sheath tube 22 through the first water inlet hole and the second water inlet hole in sequence, and the other end is connected to the water inlet port 12. The water inlet port 12 is in communication with the inner sheath tube 22 through the second drainage tube. The outside of the second drainage tube is wrapped with a second sealing ring. The second sealing ring seals the gap between the outer wall of the second drainage tube and the first water inlet hole and the second water inlet hole, so as to prevent the cooling liquid from leaking out.
[0046] Specifically, the first sealing ring and the second sealing ring are both made of soft polymer materials such as silica gel and rubber.
[0047] As shown in Figure 4 , 6 , 7, it further comprises a second flow guide ring 224; the inner wall of the second flow guide ring 224 is fixedly connected with the inner sheath tube 22, and the outer wall abuts against the outer sheath tube 21; the second flow guide ring 224 has a second flow guide hole; the second flow guide ring 224 is located in the direction away from the flow limiting plate 222 of the first flow guide ring.
[0048] Specifically, the distance between the axis of the second flow guide hole and the axis of the first flow guide hole 226 is a; the radius of the first flow guide hole 226 is b; the radius of the second flow guide hole is c, and a > b + c. The purpose of this design is to prolong the residence time of the cooling liquid at the distal end of the outer sheath tube 21.
[0049] As shown in Figure 4 , 6As shown in Figure 7, it also includes a third guide ring 225; the inner wall of the third guide ring 225 is fixedly connected to the inner sheath tube 22, and the outer wall abuts against the outer sheath tube 21; the third guide ring 225 has a third guide hole 227; the third guide ring 225 is located in the direction away from the flow limiting plate 222 of the second guide ring 224. The distance between the axis of the third guide hole 227 and the axis of the second guide hole is d; the radius of the second guide hole is c, and the radius of the third guide hole 227 is e, where d > c + e.
[0050] The coolant enters the space between the outer sheath 21 and the inner sheath 22 through the gap between the flow restrictor 222 and the inner wall of the outer sheath 21, and then passes sequentially through the first guide ring, the second guide ring 224, and the third guide ring 225. The first guide hole 226 and the second guide hole do not coincide, and the second guide hole and the third guide hole 227 do not coincide. This means that the coolant must completely fill the gap between the first guide ring and the third guide ring 225 before flowing out through the third guide hole 227, thus allowing the coolant to completely surround the distal end of the ablation needle. Furthermore, the first guide ring, the second guide ring 224, and the third guide ring 225 prolong the residence time of the coolant at the distal end of the outer sheath 21, further improving cooling efficiency.
[0051] In some embodiments of this application, such as Figures 8-9 As shown, in order to prevent the coolant from staying between the first guide ring and the third guide ring 225 for too long, the diameters of the first guide hole 226, the second guide hole, and the third guide hole 227 are enlarged, so that the first guide ring, the second guide ring 224, and the third guide ring 225 are all C-shaped ring structures.
[0052] The above are merely specific embodiments of this application. Under the guidance of the above teachings, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of this application, and the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A suction-structured ablation needle, comprising a holding portion, a cooling portion, and an ablation portion, characterized in that, The gripping part is connected to the cooling part; the cooling part includes an outer sheath and an inner sheath; the outer sheath wraps around the outside of the inner sheath; the ablation part passes through the gripping part and enters the interior of the inner sheath; a spiral guide groove is provided on the inner wall of the inner sheath; a first guide ring is provided on the outside of the inner sheath; the inner wall of the first guide ring is fixedly connected to the inner sheath, and the outer wall abuts against the outer sheath; the first guide ring has a first guide hole; a flow limiting plate is fixedly connected to the end of the inner sheath away from the gripping part; both sides of the flow limiting plate abut against the inner wall of the outer sheath; there is a gap between the end of the flow limiting plate away from the gripping part and the inner wall of the outer sheath; the first guide hole is located in the direction away from the ablation part of the flow limiting plate.
2. The aspiration structure ablation needle according to claim 1, characterized in that, The gripping part is provided with a drain port and a water inlet port; the drain port is connected to the outer sheath tube; the water inlet port is connected to the inner sheath tube.
3. The aspiration structure ablation needle according to claim 2, characterized in that, The drain port is connected to the outer sheath via a first drain pipe; the inlet port is connected to the inner sheath via a second drain pipe; the first drain pipe is wrapped with a first sealing ring; the second drain pipe is wrapped with a second sealing ring.
4. The aspiration structure ablation needle according to claim 1, characterized in that, It also includes a second flow guide ring; the inner wall of the second flow guide ring is fixedly connected to the inner sheath tube, and the outer wall abuts against the outer sheath tube; the second flow guide ring has a second flow guide hole; the second flow guide ring is located in the direction away from the flow limiting plate of the first flow guide ring.
5. The aspiration structure ablation needle according to claim 4, characterized in that, The distance between the axis of the second guide hole and the axis of the first guide hole is a; the radius of the first guide hole is b; the radius of the second guide hole is c, and a > b + c.
6. The aspiration structure ablation needle according to claim 4, characterized in that, It also includes a third flow guide ring; the inner wall of the third flow guide ring is fixedly connected to the inner sheath tube, and the outer wall abuts against the outer sheath tube; the third flow guide ring has a third flow guide hole; the third flow guide ring is located in the direction away from the flow limiting plate of the second flow guide ring.
7. The aspiration structure ablation needle according to claim 6, characterized in that, The distance between the axis of the third guide hole and the axis of the second guide hole is d; the radius of the second guide hole is c, and the radius of the third guide hole is e, where d > c + e.
8. The aspiration structure ablation needle according to claim 1, characterized in that, The gripping part has a working channel inside; the ablation part passes through the gripping part through the working channel; the working channel has a sealing ring inside.
9. The aspiration structure ablation needle according to claim 1, characterized in that, One end of the cooling section is inserted into the gripping section; a sealing element is wrapped around the side wall of the end of the cooling section that is inserted into the gripping section.
10. An aspiration-structured ablation needle according to any one of claims 1-9, characterized in that, The cooling section gradually tapers at the end furthest from the gripping section.