Cannulated, blunt-tipped ablation needle
By designing a blunt-tipped ablation needle with a cannula, and using a blunt tip and cannula structure, the problem of complications in microwave ablation surgery in high-risk areas has been solved, achieving safe and efficient ablation surgery results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI PEOPLES HOSPITAL
- Filing Date
- 2025-01-23
- Publication Date
- 2026-06-16
AI Technical Summary
When performing microwave ablation surgery in high-risk areas, existing cannulas are prone to causing serious complications such as massive bleeding, air embolism, and bronchospasm, and changing the cannulas is difficult. In particular, in high-risk areas around the hilum of the lung, the sharp cannulas of traditional methods can easily puncture important tissue structures.
A blunt-tipped ablation needle with a cannula was designed. It adopts a blunt tip and cannula structure. After the needle core punctures the skin layer, the blunt tip is replaced to pass through the lung. The cannula and ablation needle are seamlessly connected. A sealing connection mechanism is used to avoid bleeding. It is equipped with a needle core and a blunt-tipped ablation needle to reduce complications.
It significantly reduced the incidence and severity of complications, improved the smoothness of needle insertion and surgical safety, avoided the problem of needle withdrawal due to puncture bleeding, and enhanced the safety of ablation needle use and the success rate of surgery.
Smart Images
Figure CN224357668U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a blunt-tipped ablation needle with a sleeve, belonging to the field of ablation needle technology. Background Technology
[0002] An ablation needle is a medical tool used to treat various pathological tissues. It heats the target tissue using energy forms such as high-frequency current or microwaves, thereby destroying and removing the diseased tissue. Specifically, microwave ablation needles utilize microwave energy to generate high temperatures, causing coagulative necrosis of tumors or diseased tissues. When microwaves act on tissue, polar molecules such as water molecules within the tissue vibrate and rub against each other at high speeds, generating heat. This rapidly raises the local tissue temperature, typically to 60–100°C, causing protein denaturation and cell membrane rupture, ultimately leading to coagulative necrosis of the tissue. This destroys the structure and function of the diseased tissue, achieving a therapeutic effect.
[0003] An ablation needle typically consists of a microwave antenna (or ablation needle tip), a needle shaft, a cooling system, and a handle. The microwave antenna is the core component, responsible for emitting microwave energy. The needle shaft is generally made of a special material with excellent thermal conductivity and insulation, ensuring effective microwave energy transmission while preventing unintended damage to surrounding healthy tissue. Some ablation needles have a PTFE insulator between the ablation needle tip and one end of the ablation needle tube, with the other end of the ablation needle tube connected to the head of the handle. Protrusions are present on the outer surfaces of both the ablation needle tip and the ablation needle tube.
[0004] During ablation procedures, to facilitate simultaneous biopsy or reduce the risk of complications from the ablation needle tract, ablation needles are typically used in conjunction with cannulas. After the cannulas are inserted into the correct position, the needle core is removed, and the ablation needle is inserted before ablation. This approach yields good results in low-risk areas. However, inserting and changing needles in high-risk areas is difficult and risky. Furthermore, the sharp tip of the cannulas can easily puncture vital structures, especially in lesions around the hilum of the lung, which are surrounded by large arteries, veins, and bronchi. The existing cannula tip is also not sealed to the ablation needle shaft. These characteristics of traditional methods make ablation procedures in high-risk areas prone to serious complications such as massive hemorrhage, air embolism, and bronchopulmonary fistula. Utility Model Content
[0005] This invention provides a blunt-tipped ablation needle with a cannula to address the safety concerns of performing microwave ablation surgery in high-risk areas.
[0006] This utility model solves the above-mentioned technical problems through the following technical solutions:
[0007] This utility model provides a blunt-tipped ablation needle with a cannula, comprising:
[0008] The device comprises a handle, a cannula, and a needle core. The handle is fixedly connected to the ablation needle via a connecting mechanism. The ablation needle has a blunt end at one end away from the handle. The cannula is sleeved with the ablation needle, and an end tube matching the connecting mechanism is fixedly connected to the end of the cannula. The needle core has the same diameter as the ablation needle and has a pointed end at one end.
[0009] In this technical solution, the handle is connected to a connecting wire, which is located inside the ablation needle and connected to the blunt end.
[0010] In this technical solution, the connecting mechanism consists of a boss and a connector. The boss is fixedly connected to the handle, and the boss is fixedly connected to the ablation needle through the connector. The diameter of the boss is larger than the diameter of the connector.
[0011] In this technical solution, two L-shaped guide grooves are formed on the surface of the connector, and the two guide grooves are located on both sides of the connector. Each guide groove has a triangular notch.
[0012] In this technical solution, the ablation needle is fitted and inserted into the inside of the cannula, and the connector at one end of the ablation needle is fitted and inserted into the inside of the end tube.
[0013] In this technical solution, a first rubber ring is fixedly connected inside the end tube, and a second rubber ring is fixedly connected to the outer edge of the end tube. When the connector is located inside the end tube, the first rubber ring is fitted and connected to the edge of the connector, and the second rubber ring is fitted and connected to the edge of the boss.
[0014] In this technical solution, two symmetrically distributed guide blocks are fixedly connected to the inner wall of the end tube. When the joint is located inside the end tube, the guide blocks are engaged and slid with the inside of the guide groove.
[0015] In this technical solution, one end of the guide groove is a vertical structure, and the other end of the guide groove is a spiral structure.
[0016] In this technical solution, the end of the sleeve near the blunt end has a rounded edge, and the distance between the sleeve at the rounded edge and the blunt end is 3cm.
[0017] In this technical solution, the needle core and the ablation needle are of the same length, and the needle core is fixedly connected to the needle handle through a connector.
[0018] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.
[0019] The positive and progressive effects of this utility model are as follows:
[0020] The aforementioned blunt-tipped ablation needle with a cannula features a cannula structure and a suitable needle core for insertion. It allows for puncture at the skin level using the needle core and cannula, and once inside the lung, the blunt-tipped ablation needle is used for further insertion. This significantly reduces the incidence and severity of complications. The cannula and ablation needle are seamlessly connected, and the exposed microwave area at the tip does not affect the normal use of the ablation needle. The blunt tip of the ablation needle avoids puncturing blood vessels, effectively resolving the issue of forced needle withdrawal due to bleeding, thus improving insertion smoothness. Furthermore, the convenient locking and sealing of the cannula and connector facilitates cannula installation while ensuring that no needle replacement is needed during puncture, and microwave hemostasis can be initiated without causing excessive bleeding. This improves the safety of the ablation needle and the success rate of the procedure. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.
[0022] Figure 2 This is a three-dimensional structural diagram of the ablation needle and needle core of this utility model.
[0023] Figure 3 This is a schematic diagram of the internal three-dimensional structure of this utility model.
[0024] Figure 4 This utility model Figure 3 A magnified schematic diagram of the structure at point A in the middle.
[0025] Figure 5 This is a schematic diagram of the external front view of the present invention.
[0026] Figure 6 This utility model Figure 5 A magnified schematic diagram of the structure at point B in the middle.
[0027] Explanation of reference numerals in the attached figures
[0028] 10. Handle; 11. Connecting wire; 12. Boss; 13. Connector; 14. Guide groove; 15. Notch; 16. Ablation needle; 17. Blunt tip; 20. Sleeve; 21. End tube; 22. First rubber ring; 23. Second rubber ring; 24. Guide block; 30. Needle core; 31. Needle handle; 32. Pointed tip. Detailed Implementation
[0029] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.
[0030] like Figure 1-6 As shown, the blunt-tipped ablation needle with a cannula includes:
[0031] The device comprises a handle 10, a sleeve 20, and a needle core 30. The handle 10 can be fixedly connected to the ablation needle 16 through a connecting mechanism. The ablation needle 16 has a blunt end 17 at one end away from the handle 10. The sleeve 20 is sleeved with the ablation needle 16, and an end tube 21 matching the connecting mechanism is fixedly connected to the end of the sleeve 20. The needle core 30 has the same diameter as the ablation needle 16, and has a pointed end 32 at one end.
[0032] The handle 10 is connected to the connecting line 11, which is located inside the ablation needle 16 and connected to the blunt end 17. The connecting mechanism consists of a boss 12 and a connector 13. The boss 12 is fixedly connected to the handle 10 and to the ablation needle 16 via the connector 13. The diameter of the boss 12 is larger than the diameter of the connector 13. Two L-shaped guide grooves 14 are provided on the surface of the connector 13. The two guide grooves 14 are located on both sides of the connector 13, and each guide groove 14 has a triangular notch 15.
[0033] In this technical solution, the connecting wire 11 is used to connect to the blunt end 17 for microwave generation, and the ablation needle 16 is connected to the handle 10 through the connecting mechanism to facilitate the subsequent assembly of the sleeve 20.
[0034] The ablation needle 16 is fitted into the inside of the cannula 20, and the connector 13 at one end of the ablation needle 16 is fitted into the inside of the end tube 21; a first rubber ring 22 is fixedly connected inside the end tube 21, and a second rubber ring 23 is fixedly connected to the outer edge of the end tube 21. When the connector 13 is inside the end tube 21, the first rubber ring 22 is fitted to the edge of the connector 13, and the second rubber ring 23 is fitted to the edge of the boss 12; two symmetrically distributed guide blocks 24 are fixedly connected to the inner wall of the end tube 21. When the connector 13 is inside the end tube 21, the guide blocks 24 are fitted into the guide groove 14 and slide; one end of the guide groove 14 is a vertical structure, and the other end of the guide groove 14 is a spiral structure.
[0035] In this technical solution, when the cannula 20 is fitted onto the ablation needle 16 or the needle core 30, the end tube 21 moves to the structure. At this time, the guide block 24 is aligned with the guide groove 14. By setting the notch 15, the guide block 24 can smoothly enter the guide groove 14. After the guide block 24 moves, the end tube 21 is rotated so that the guide block 24 rotates inside the spiral structure, thereby locking the end tube 21. At the same time, the second rubber ring 23 abuts against the edge of the boss 12, and the first rubber ring 22 abuts against the edge of the connector 13 to achieve a seal at the connection position. When the needle is inserted at this time, since the outer end is in a closed state, even if a puncture occurs, there will be no bleeding problem.
[0036] The end of the cannula 20 near the blunt end 17 has a rounded edge, and the distance between the cannula 20 at the rounded edge and the blunt end 17 is 3cm; the needle core 30 and the ablation needle 16 have the same length, and the needle core 30 is fixedly connected to the needle handle 31 through the connector 13.
[0037] In this technical solution, when in the skin layer, the needle core 30 is inserted into the cannula 20 for needle insertion. The needle handle 31 is connected to the outside to achieve puncture and needle insertion. After entering the lung, the needle core 30 is withdrawn, and the ablation needle 16 is inserted. The blunt end 17 is used to pass through the lung without puncturing blood vessels, making it easy to reach the deep target location.
[0038] This utility model is not limited to the above-described embodiments. Any changes in its shape or structure fall within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the protection scope of this utility model.
Claims
1. A blunt-tipped ablation needle with a cannula, characterized in that, include: The device comprises a handle (10), a cannula (20), and a needle core (30). The handle (10) can be fixedly connected to the ablation needle (16) through a connecting mechanism. The ablation needle (16) has a blunt end (17) at one end away from the handle (10). The cannula (20) is sleeved with the ablation needle (16), and the end of the cannula (20) is fixedly connected with an end tube (21) that matches the connecting mechanism. The needle core (30) has the same diameter as the ablation needle (16), and one end has a pointed end (32).
2. The blunt-tipped ablation needle with a cannula as described in claim 1, characterized in that: The handle (10) is connected to the connecting line (11), which is located inside the ablation needle (16) and connected to the blunt end (17).
3. The blunt-tipped ablation needle with a cannula as described in claim 1, characterized in that: The connecting mechanism consists of a boss (12) and a connector (13). The boss (12) is fixedly connected to the handle (10), and the boss (12) is fixedly connected to the ablation needle (16) through the connector (13). The diameter of the boss (12) is larger than the diameter of the connector (13).
4. The blunt-tipped ablation needle with a cannula as described in claim 3, characterized in that: The surface of the connector (13) has two L-shaped guide grooves (14), which are located on both sides of the connector (13). Each guide groove (14) has a triangular notch (15).
5. The blunt-tipped ablation needle with a cannula as described in claim 1, characterized in that: The ablation needle (16) The ablation needle (16) is inserted into the sleeve (20) and the connector (13) at one end of the ablation needle (16) is inserted into the end tube (21).
6. The blunt-tipped ablation needle with a cannula as described in claim 5, characterized in that: The end tube (21) is fixedly connected to the first rubber ring (22), and the outer edge of the end tube (21) is fixedly connected to the second rubber ring (23). When the connector (13) is located inside the end tube (21), the first rubber ring (22) is attached to the edge of the connector (13), and the second rubber ring (23) is attached to the edge of the boss (12).
7. The blunt-tipped ablation needle with a cannula as described in claim 5, characterized in that: Two symmetrically distributed guide blocks (24) are fixedly connected to the inner wall of the end tube (21). When the joint (13) is located inside the end tube (21), the guide blocks (24) are engaged and slide inside the guide groove (14).
8. The blunt-tipped ablation needle with a cannula as described in claim 7, characterized in that: The guide groove (14) One end is a vertical structure, and the other end of the guide groove (14) is a spiral structure.
9. The blunt-tipped ablation needle with a cannula as described in claim 1, characterized in that: The sleeve (20) has a rounded edge at one end near the blunt end (17), and the distance between the sleeve (20) at the rounded edge and the blunt end (17) is 3cm.
10. The blunt-tipped ablation needle with a cannula as described in claim 1, characterized in that: The needle core (30) and the ablation needle (16) are of the same length, and the needle core (30) is fixedly connected to the needle handle (31) through the connector (13).