Ablation device for percutaneous puncture
By setting an ablation device with elastic elements between the outer sheath tube and the puncture needle, the displacement problem caused by the ablation electrode due to respiration and heartbeat is solved, achieving a more efficient and accurate ablation effect.
Patent Information
- Application Number
- CN202421001897.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-05-09
AI Technical Summary
In percutaneous puncture ablation technology, the body's breathing ups and downs and heart beats lead to displacement of the ablation electrode, which is difficult to maintain in the expected working area, leading to the risk of poor treatment and incomplete ablation.
A percutaneous puncture ablation device is designed. By setting an elastic element between the outer sheath tube and the puncture needle, the elastic connection between the puncture needle and the outer sheath tube is realized, absorbing the shaking caused by the heartbeat and the opening and closing of the lungs, ensuring that the puncture needle is relatively stationary and keeping the ablation electrode within the target range.
Effectively avoiding the puncture needle off-target, improving the ablation efficiency and quality, and ensuring that the ablation electrode always works within the expected range.
Smart Images
Figure CN222565929U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of energy ablation, in particular to a percutaneous puncture ablation device. Background Art
[0002] In the clinical treatment of tumors using irreversible electroporation technology, electric pulses are used to ablate biological tissues. This is done by sending electric field pulses to target cells, causing ions inside and outside the cells to move and gather on both sides of the outer membrane, causing a sharp change in transmembrane potential, causing irreversible electroporation of the cells, breaking the balance inside and outside the cells, and ultimately causing cell death. Compared with traditional thermal ablation technology, pulse ablation can avoid the problem of heat sink effect.
[0003] Although percutaneous ablation technology is relatively mature, the fluctuations in the body's breathing during the ablation process will cause the ablation electrode to move, especially when ablation is performed on tumor tissue close to the heart or lungs. The ablation electrode is easily displaced due to the beating of the heart and the opening and closing of the lung lobes caused by breathing, so that the ablation electrode does not work in the expected working area or is separated from the target tissue, resulting in poor treatment effect and the risk of incomplete ablation. Utility Model Content
[0004] The utility model provides a percutaneous ablation device, which solves the problem in the background technology that during subcutaneous ablation, the ablation electrode is displaced and is not within the expected working range or is separated from the target tissue.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A percutaneous ablation device, comprising:
[0007] An outer sheath tube is provided with a first channel, the outer sheath tube has a proximal end and a distal end, and the first channel runs through the proximal end and the distal end of the outer sheath tube;
[0008] A puncture needle, on which a first ablation electrode is provided, the puncture needle is movably arranged at the distal end of the outer sheath tube, and the puncture needle can reciprocate along the axial direction of the outer sheath tube;
[0009] An elastic element is arranged between the outer sheath and the puncture needle, one end of the elastic element is connected to the puncture needle, and the other end of the elastic element is connected to one end of the outer sheath, wherein the outer sheath, the elastic element and the puncture needle are coaxially arranged.
[0010] In some embodiments, the elastic element is a spring.
[0011] In some embodiments, a traction rope is further included, wherein the traction rope is movably inserted into the first channel of the outer sheath tube, and one end of the traction rope passes through the spring and is connected to the puncture needle.
[0012] In some embodiments, the traction rope includes a first traction wire and a second traction wire, a first connection point between the first traction wire and the puncture needle and a second connection point between the second traction wire and the puncture needle are symmetrically arranged, and the first connection point and the second connection point pass through the axis of the puncture needle.
[0013] In some embodiments, the outer sheath is further provided with two first control channels, and the first traction wire and the second traction wire are respectively located in the corresponding first control channels.
[0014] In some embodiments, the outer diameter of the puncture needle is equal to the outer diameter of the outer sheath, and the outer diameter of the spring is not greater than the outer diameter of the puncture needle.
[0015] In some embodiments, a second ablation electrode is disposed at the distal end of the outer sheath, and the polarity of the second ablation electrode is opposite to that of the first ablation electrode.
[0016] In some embodiments, the outer sheath is made of a conductive metal material, and a first insulating layer is provided on the outer sheath, wherein a distal end portion of the outer sheath is exposed to form a second ablation electrode.
[0017] In some embodiments, a first wire is further included, on which a second insulating layer is provided. The first wire is disposed in a first channel of the outer sheath tube, and one end of the first wire passes through the outer sheath tube and the elastic element and is connected to the first ablation electrode.
[0018] In some embodiments, a developing ring is provided on the puncture needle.
[0019] In some embodiments, the outer sheath tube is provided with scale markings, and the scale markings are evenly distributed along the axial direction of the outer sheath tube.
[0020] In some embodiments, a limit block is provided on the outer sheath tube, the limit block is tightly matched with the outer sheath tube, and the limit block can move along the axial direction of the outer sheath tube.
[0021] In some embodiments, an operating handle is further included, wherein the operating handle is coaxially arranged with the outer sheath tube, and the proximal end of the outer sheath tube is fixedly connected to the operating handle.
[0022] In some embodiments, it also includes a knob arranged on the outside of the operating handle, the knob is provided with a first rotating shaft, and the knob is rotatably arranged on the operating handle via the first rotating shaft, wherein the first rotating shaft is provided with a first receiving groove and a second receiving groove parallel to each other, one end of the first traction wire is connected to the first receiving groove, and one end of the second traction wire is connected to the second receiving groove, and the distance between the first receiving groove and the second receiving groove is equal to the distance between the first traction wire and the second traction wire.
[0023] Compared with the prior art, the beneficial effects brought by the utility model are:
[0024] The present application elastically connects the coaxially arranged outer sheath and the puncture needle by setting an elastic element between the outer sheath and the puncture needle. When ablation is performed, the beating of the heart or the opening and closing of the lungs will be absorbed by the elastic element. The elastic element can be expanded and contracted to achieve relative stillness between the puncture needle and the target tissue, thereby ensuring that the first ablation electrode is always within the target ablation range, preventing the puncture needle from missing the target, and improving ablation efficiency and quality.
[0025] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is a stereoscopic diagram of the overall assembly of a percutaneous ablation device of the utility model;
[0027] Figure 2 It is a schematic diagram of the elongated state of an elastic element of a percutaneous ablation device of the utility model;
[0028] Figure 3 It is a schematic diagram of a compressed state of an elastic element of a percutaneous ablation device of the utility model;
[0029] Figure 4 A schematic diagram of the scale markings on the outer sheath of a percutaneous ablation device of the utility model;
[0030] Figure 5 It is a cross-sectional schematic diagram of an outer sheath of a percutaneous ablation device of the utility model;
[0031] Figure 6 It is a schematic diagram of a percutaneous ablation device of the utility model, in which a limit block is at a preset puncture depth;
[0032] Figure 7 This is a schematic diagram of a monopolar ablation structure of a percutaneous ablation device of the utility model;
[0033] Figure 8 This is a schematic diagram of a bipolar ablation structure of a percutaneous ablation device of the utility model;
[0034] Fig. 9 This is a schematic diagram of the internal structure of a monopolar ablation operating handle of a percutaneous ablation device of the utility model;
[0035] Fig.10 This is a schematic diagram of the internal structure of a bipolar ablation operating handle of a percutaneous ablation device of the utility model;
[0036] Fig.11 It is a structural schematic diagram of another connection method between the puncture needle and the outer sheath of a percutaneous puncture ablation device of the utility model;
[0037] Fig.12 It is a cross-sectional view of the first connection point and the second connection point of a percutaneous ablation device of the utility model. DETAILED DESCRIPTION
[0038] The present application is further described in detail below in conjunction with specific drawings. In the description of this embodiment, unless otherwise specified, the terms "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the present application must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application.
[0039] In one embodiment, Figure 1 and Figure 2 As shown, a percutaneous ablation device provided by the utility model mainly includes an outer sheath tube 2, a puncture needle 4 and an elastic element 3. The outer sheath tube 2 is provided with a first channel 21, which has a distal end and a proximal end, wherein the proximal end is the left side and the distal end is the right side as shown in the figure, and the first channel 21 runs through its proximal end and distal end; the elastic element 3 is arranged at the distal end of the outer sheath tube 2, and one end of the elastic element 3 is fixedly connected to the distal end of the outer sheath tube 2; the puncture needle 3 is arranged at the other end of the elastic element 3, and a first ablation electrode 41 is arranged on the puncture needle 4. In this embodiment, the puncture needle 4 is integrally formed of a metal material to form the first ablation electrode 41; the puncture needle 4 can reciprocate along the axial direction of the outer sheath tube 2 to compress or stretch the elastic element 3. In this embodiment, the outer sheath tube 2 is a rigid structure, which cannot be bent, and can effectively ensure the puncture force. The outer sheath tube 2 is coaxially arranged with the elastic element 3 and the puncture needle 4 to ensure the smoothness and puncture strength of the subcutaneous puncture. When the structure is monopolar ablation, such as Fig. 9 As shown, at this time, the outer sheath 2 , the elastic element 3 and the puncture needle 4 are all made of conductive materials and can conduct electricity. The outer sheath 2 is electrically connected through the second wire 62 to communicate with the first ablation electrode 41 .
[0040] The present application realizes an elastic connection between the puncture needle 4 and the outer sheath 2 by setting an elastic element 3 between the outer sheath 2 and the puncture needle 4. When the puncture needle 4 penetrates into the tumor tissue, the opening and closing of the lungs and the shaking caused by the beating of the heart will be absorbed by the elastic element 3 so that the puncture needle 4 will not be displaced relative to the target tissue, thereby ensuring that the first ablation electrode 41 on the puncture needle 4 is always within the target range for effective ablation, improving the ablation quality, and preventing the puncture needle 4 from missing the target.
[0041] In one embodiment, the elastic element 3 is preferably a spring. Since the spring is also a tubular structure, and the deformation of the spring is elastic deformation, it is easy to recover. The spring itself is a hollow structure, leaving a preset space for the subsequent first wire 61 to pass through the elastic element 3. At the same time, the outer diameter of the spring and the outer diameter of the outer sheath 2 can be set equal, and the continuity of the connection between the outer sheath 2 and the puncture needle 4 can be guaranteed in the extruded state. Optionally, the elastic element 3 can also be set as a spring. In this case, a through hole needs to be opened on the spring to reserve space for the first wire 61.
[0042] In one embodiment, it also includes a traction rope, which is movably inserted into the first channel 21 of the outer sheath tube 2, and one end of the traction rope passes through the elastic element 3 and is fixedly connected to the puncture needle 4. During puncture, since the puncture needle 4 is subjected to force and the spring is squeezed, in order to ensure the stability of the puncture, the puncture needle 4 is pulled by controlling the traction rope before puncture to compress the elastic element 3, so that the chain structure between the puncture needle 4 and the outer sheath tube 2 is rigid, thereby ensuring the puncture force and preventing the puncture needle from bending. Optionally, as Fig.11 As shown, a guide rod 7 may be provided between the puncture needle 4 and the outer sheath tube 2, an adaptable guide hole may be provided in the outer sheath tube 2, and a limiting boss may be provided at one end of the guide rod 7 to prevent the guide rod 7 from being separated from the guide hole. By providing such a structure, the puncture needle 4 may be guided to squeeze the elastic element 3 during puncture.
[0043] A step forward, such as Figure 7 As shown, the traction rope is composed of a first traction wire 51 and a second traction wire 52. Specifically, the first traction wire 51 is fixedly connected to the puncture needle 4 to form a first connection point 511, and the second traction wire 52 is fixedly connected to the puncture needle 4 to form a second connection point 521, wherein the first connection point 511 and the second connection point 521 are symmetrically arranged on the inner wall of the puncture needle 4, as shown in FIG. Fig.12As shown, the line between the first connection point 511 and the second connection point 521 passes through the central axis of the puncture needle 4. By adopting the above structure, it is ensured that the puncture needle 4 is subjected to uniform force during the compression of the elastic element 3, and the elastic element 3 will not cause the puncture needle 4 to bend. Optionally, a traction wire can also be used, and in this case, the fixing point of the traction wire needs to be set on the central axis of the puncture needle 4.
[0044] Furthermore, in order to avoid mutual interference between the first traction wire 51 and the second traction wire 52, as Figure 5 As shown, two symmetrical control channels 24 are provided on the outer sheath tube 2 , wherein the first traction wire 51 is movably inserted into one of the control channels 24 , and the second traction wire 52 is movably inserted into the other control channel 24 .
[0045] In one embodiment, the outer diameter of the puncture needle 4 is equal to the outer diameter of the outer sheath tube 2, and the elastic element 3 is a spring structure, and its outer diameter is not greater than the outer diameter of the puncture needle 4. By limiting the shape of the spring, when the puncture needle 4 presses the elastic element 3, it is ensured that the outer wall of the elastic element 3 will not bulge out, thereby ensuring that the puncture process will not be obstructed. Preferably, the outer diameter of the elastic element 3 is equal to the outer diameter of the puncture needle 4 and the outer sheath tube 2, so that the outer walls of the three are coplanar, thereby ensuring the flexibility of the puncture of the puncture needle 4.
[0046] In one embodiment, Figure 8 and Fig.10 As shown, the distal end of the outer sheath tube 2 is provided with a second ablation electrode 26, and the polarity of the second ablation electrode 26 is opposite to that of the first ablation electrode 41. Further, in the present application, the outer sheath tube 2 is made of a conductive metal pipe, and a first insulating layer 25 is provided on the outer sheath tube 2, and the distal end of the outer sheath tube 2 is partially exposed to form a second ablation electrode 26, corresponding to the first ablation electrode 41, to form a pulse electric field near the tumor tissue. Specifically, one end of the first wire 61 passes through the first channel 21 and the elastic element 3 to connect with the puncture needle 4. In this embodiment, the two are fixedly connected by welding. At this time, the puncture needle 4 and the outer sheath tube 2 are insulated. For example, an insulating coating can be provided between the elastic element 3 and the outer sheath tube 2, or an insulating coating can be provided between the puncture needle 4 and the elastic element 3. A second insulating layer is provided on the first wire 61 to avoid the situation where the first wire 61 is connected to the outer sheath tube 2 when passing through the first channel 21 to form a short circuit. When the first ablation electrode 41 on the puncture needle 4 is positive, the second ablation electrode 26 on the outer sheath 2 is negative. When the first ablation electrode 41 on the puncture needle 4 is negative, the second ablation electrode 26 on the outer sheath 2 is positive.
[0047] In one embodiment, Figure 2 and Figure 3As shown, in order to facilitate the operator to observe the position of the puncture needle in real time, a developing ring 43 is provided on the puncture needle 4. Specifically, the operator needs to use CT, and the developing ring 43 is used for developing under CT scanning so that the operator knows the position of the puncture needle 4. Optionally, the developing ring 43 can be made of a platinum iridium ring or barium sulfate.
[0048] In one embodiment, Figure 4 As shown, the outer sheath tube 2 is provided with scale marks 23, and the scale marks 23 are evenly distributed along the axial direction of the outer sheath tube 2. In this embodiment, before puncturing, a CT scan is first performed to determine the puncture layer and puncture point, and then the straight-line distance (or the shortest distance) between the skin needle entry point and the lesion is measured with a CT cursor to determine the puncture depth 27 and angle. Figure 6 as shown to prevent the operator from puncturing too much or too little.
[0049] Furthermore, in order to ensure the accuracy of the puncture depth and prevent the operator from over-puncturing during the puncture process, a stopper 22 is provided on the outer sheath tube 2, and the stopper 22 is tightly fitted with the outer sheath tube 2. Under the action of external force, the stopper 22 can move along the axial direction of the outer sheath tube 2. Preferably, the stopper 22 is made of elastic rubber. When the needle insertion depth 27 and the needle insertion angle are confirmed by CT, the operator pushes the stopper 22 to the corresponding scale mark 23, and then performs puncture. When the stopper 22 abuts against the operator's skin, the puncture can be stopped.
[0050] In one embodiment, the ablation device further includes an operating handle 1 , on which a grip is provided. The operating handle 1 is coaxially arranged with the outer sheath tube 2 to ensure the puncture force. Meanwhile, the proximal end of the outer sheath tube 2 is fixedly connected to the operating handle 1 .
[0051] Furthermore, a knob 11 is further provided on the operating handle 1, and the knob 11 is located outside the housing of the operating handle 1. The knob 11 is provided with a first rotating shaft 12, and the first rotating shaft 12 realizes the rotation connection between the knob 11 and the operating handle 1. In this embodiment, the first rotating shaft 12 is rotated by the hole axis limit rotation or the bearing is set for rotation, wherein the first receiving groove 121 and the second receiving groove 122 are arranged on the first rotating shaft 12, and one end of the first traction wire 51 is fixedly connected to the first receiving groove 121, and one end of the second traction wire 52 is fixedly connected to the second receiving groove 122. In order to ensure that the first traction wire 51 and the second traction wire 52 have less resistance in the process of pulling the puncture needle 4 to compress the elastic element 3, the spacing between the first receiving groove 121 and the second receiving groove 122 is equal to the spacing between the first traction wire 51 and the second traction wire 52, so as to ensure that one end of the first traction wire 51 and one end of the second traction wire 52 are arranged parallel to the outer sheath tube 2 when extending out of the outer sheath tube 2, thereby reducing the friction resistance between the two and the outer sheath tube 2.
[0052] Furthermore, it also includes a cable assembly 6. When a bipolar structure is adopted and the polarities are opposite, the outer sheath tube 2 is connected to the external energy generator through the second wire 62. In order to ensure the stability of the connection between the second wire 62 and the outer sheath tube 2, a conductive connecting ring 621 is provided at one end of the second wire 62. The contact surface between the second wire 62 and the outer sheath tube 2 is increased by the connecting ring 621 to avoid false connection or missing connection.
[0053] The above is only a preferred embodiment of the present invention. It should be noted that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention.
Claims
1. A percutaneous ablation device, characterized in that: include: An outer sheath tube is provided with a first channel, the outer sheath tube has a proximal end and a distal end, and the first channel runs through the proximal end and the distal end of the outer sheath tube; A puncture needle, on which a first ablation electrode is provided, the puncture needle is movably arranged at the distal end of the outer sheath tube, and the puncture needle can reciprocate along the axial direction of the outer sheath tube; An elastic element is arranged between the outer sheath and the puncture needle, one end of the elastic element is connected to the puncture needle, and the other end of the elastic element is connected to one end of the outer sheath, wherein the outer sheath, the elastic element and the puncture needle are coaxially arranged.
2. A percutaneous ablation device according to claim 1, characterized in that: The elastic element is a spring.
3. A percutaneous ablation device according to claim 2, characterized in that: It also includes a traction rope, which is movably inserted into the first channel of the outer sheath tube, and one end of the traction rope passes through the spring and is connected to the puncture needle.
4. A percutaneous ablation device according to claim 3, characterized in that: The traction rope includes a first traction wire and a second traction wire, a first connection point between the first traction wire and the puncture needle and a second connection point between the second traction wire and the puncture needle are symmetrically arranged, and the first connection point and the second connection point pass through the axis of the puncture needle.
5. A percutaneous ablation device according to claim 4, characterized in that: The outer sheath is also provided with two first control channels, and the first traction wire and the second traction wire are respectively located in the corresponding first control channels.
6. A percutaneous ablation device according to claim 2, characterized in that: The outer diameter of the puncture needle is equal to the outer diameter of the outer sheath tube, and the outer diameter of the spring is not greater than the outer diameter of the puncture needle.
7. A percutaneous ablation device according to claim 1, characterized in that: A second ablation electrode is disposed at the distal end of the outer sheath tube, and the polarity of the second ablation electrode is opposite to that of the first ablation electrode.
8. A percutaneous ablation device according to claim 7, characterized in that: The outer sheath tube is made of a conductive metal material and is provided with a first insulating layer, wherein the distal end portion of the outer sheath tube is exposed to form a second ablation electrode.
9. A percutaneous ablation device according to claim 8, characterized in that: It also includes a first wire, on which a second insulating layer is provided. The first wire is arranged in a first channel of the outer sheath tube, and one end of the first wire passes through the outer sheath tube and the elastic element and is connected to the first ablation electrode.
10. The percutaneous ablation device according to claim 1, characterized in that: The puncture needle is provided with a developing ring.
11. A percutaneous ablation device according to claim 10, characterized in that: The outer sheath tube is provided with scale marks, and the scale marks are evenly distributed along the axial direction of the outer sheath tube.
12. A percutaneous ablation device according to claim 11, characterized in that: The outer sheath tube is provided with a limit block, the limit block and the outer sheath tube are tightly matched, and the limit block can move along the axial direction of the outer sheath tube.
13. A percutaneous ablation device according to claim 4, characterized in that: It also includes an operating handle, which is coaxially arranged with the outer sheath tube, and the proximal end of the outer sheath tube is fixedly connected to the operating handle.
14. A percutaneous ablation device according to claim 13, characterized in that: It also includes a knob arranged on the outside of the operating handle, the knob is provided with a first rotating shaft, and the knob is rotatably arranged on the operating handle via the first rotating shaft, wherein the first rotating shaft is provided with a first receiving groove and a second receiving groove parallel to each other, one end of the first traction wire is connected to the first receiving groove, and one end of the second traction wire is connected to the second receiving groove, and the distance between the first receiving groove and the second receiving groove is equal to the distance between the first traction wire and the second traction wire.