A biopsy needle based on electrode cutting

Abstract

The present invention discloses a biopsy needle based on electrode cutting, belonging to the field of medical devices, which includes a cable, a handle, a needle rod and a needle head connected in sequence. The handle is connected with a first negative pressure suction tube and a second negative pressure suction tube; inside the handle, there are arranged a first negative pressure channel tube, a second negative pressure channel tube, a screw rod and an inner needle tube. The inner needle tube is cut by an electrode head. Through the movement and cutting of the first negative pressure channel tube, the second negative pressure channel tube, the screw rod and the inner needle tube, the biopsy sampling is completed. The present invention uses an electrode head for electrode cutting instead of a rotating cutting blade, there is no rotational movement, it has less noise, and can achieve coagulation while cutting, reducing bleeding. At the same time, it avoids the skin prolapsing into the sample groove before the cutter advances into the tissue, resulting in shaving of the skin, reducing the pain and scar of sampling.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and particularly relates to a rotational cutting biopsy needle for cutting tissues. Background Art

[0002] Currently, the commonly used method for detecting tissue lesions is to obtain tissue samples for subsequent pathological examinations, usually vacuum-assisted core biopsy, in which larger samples are aspirated by vacuum assistance and cut by a cutter. Known biopsy devices can obtain multiple samples without removing the probe, which shortens the operation time and reduces the sampling procedure. In addition, this is also beneficial for obtaining sufficient samples to completely excise suspicious lesions.

[0003] The wide-side opening of the biopsy device probe combined with vacuum assistance, especially with a separate vacuum chamber, has many advantageous features. However, there are also situations where it is difficult to perform a biopsy on lesions near the skin using a core biopsy probe, which is more often challenging when sampling smaller breasts, especially when compression is performed in a positioning fixture that restricts the selection along the contact direction. If the side opening of the probe is partially exposed, the vacuum assistance will fail when the sample slot in the probe is exposed to atmospheric pressure. Moreover, before the cutter travels into the tissue, the skin may prolapse into the sample slot, resulting in shaving of the skin, increasing the pain and scarring in the subsequent process.

[0004] In addition, traditional biopsy devices rely on the high-speed rotation of the inner needle tube for reciprocating cutting, which will generate some noise and cause some interference to both doctors and patients. Therefore, there is a great need for such a core biopsy device that can perform a biopsy on suspicious lesions near the skin while producing less unnecessary noise. Summary of the Invention

[0005] In view of the above deficiencies in the prior art, the present invention provides a biopsy needle based on electrode cutting, which solves the problems of noise during biopsy and shaving of the skin during cutting, resulting in pain and scarring.

[0006] To achieve the above-mentioned invention objective, the technical solution adopted by the present invention is: a biopsy needle based on electrode cutting, comprising a cable, a handle, a needle rod, and a needle head connected in sequence, and the handle is connected with a first negative pressure suction tube and a second negative pressure suction tube;

[0007] The cable is used for connecting with an external power supply;

[0008] The handle includes a motor assembly, an upper housing, and a lower housing that are snap-connected in sequence from top to bottom; the motor assembly is connected with the cable;

[0009] The needle rod includes an outer needle tube, a cutting edge provided at one end of the outer needle tube, and a third negative pressure channel tube provided under the outer needle tube and attached to the outer needle tube; one ends of the outer needle tube and the third negative pressure channel tube are both connected to the handle;

[0010] The needle head is connected to the cutting edge end of the outer needle tube.

[0011] The beneficial effects of the present invention are as follows: The present invention designs a biopsy needle based on electrode cutting, which uses an electrode head for electrode cutting instead of a rotating cutting blade. There is no rotating motion, resulting in less noise. It can also perform cutting and coagulation simultaneously, reducing bleeding. At the same time, it can avoid skin prolapse into the sample slot before the cutter advances into the tissue, reducing subsequent pain and scars.

[0012] Furthermore: The motor assembly is provided with a button for starting and stopping the motor assembly; the upper housing is provided with a sampling slot for storing biopsy tissues.

[0013] Furthermore: A screw rod, an inner needle tube, a first negative pressure channel tube, a first negative pressure interface, and a second negative pressure interface are provided between the upper housing and the lower housing of the handle;

[0014] The screw rod is provided with threads. The threads are loosely arranged at one end of the screw rod and densely arranged at the other end. A connector and a gear are provided at the loosely arranged end of the threads. The connector connects the screw rod and the inner needle tube, and the gear is connected to the motor assembly. One end of the inner needle tube is connected to one end of the second negative pressure interface, the other end of the inner needle tube is connected to the needle rod, one end of the first negative pressure channel tube is connected to one end of the first negative pressure interface, the other end of the first negative pressure channel tube communicates with the needle rod, the other end of the first negative pressure interface is connected to the first negative pressure suction tube, and the other end of the second negative pressure interface is connected to the second negative pressure suction tube;

[0015] When the screw rod rotates, the connector moves back and forth along the threads, moving faster at the loose part of the threads and slower at the dense part of the threads. When the connector moves, it drives the inner needle tube to move along the needle rod; the motor assembly drives the screw rod to rotate through the gear.

[0016] The beneficial effects of the above further solution are as follows: By providing loose and dense threads on the screw rod, the advancing rate of the inner needle tube can be controlled. During tissue cutting, the inner needle tube can be kept advancing slowly, improving the accuracy of tissue biopsy.

[0017] Furthermore: The inner needle tube is specifically connected with a second negative pressure channel tube, an electrode head, and a sealing sleeve;

[0018] One end of the inner needle tube is connected to the electrode head, the electrode head is placed inside the outer needle tube of the needle rod, the other end of the inner needle tube is connected to one end of the second negative pressure channel tube, and a sliding seal is carried out through the sealing sleeve and the second negative pressure channel tube. The other end of the second negative pressure channel tube is connected to the second negative pressure interface;

[0019] The electrode head includes a semi-circular electrode wire and an insulating layer; the insulating layer is connected to both ends of the semi-circular electrode wire;

[0020] The sealing sleeve is used to enable the inner needle tube to slide along the second negative pressure channel tube;

[0021] The semi-circular electrode wire is the positive electrode, the inner needle tube is the negative electrode, and the semi-circular electrode wire and the inner needle tube form a plasma excitation bipolar structure for cutting tissue.

[0022] The beneficial effect of the above further scheme is that by using an electrode head on the inner needle tube instead of a cutting blade, compared with cutting living tissue with a rotating blade, it has less noise and realizes coagulation while cutting, reducing bleeding.

[0023] Further: One end of the inner needle tube connected to the electrode head passes through the sampling groove of the upper housing and is connected to one end of the outer needle tube. One end of the third negative pressure channel tube is connected to the other end of the inner needle tube. The other ends of the outer needle tube and the third negative pressure channel tube are both connected to the needle head. A cutting edge is provided on one side of the outer needle tube close to the needle head, and a plurality of suction holes are provided inside the needle rod corresponding to the cutting edge to connect the outer needle tube and the third negative pressure channel tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a biopsy needle based on electrode cutting according to the present invention;

[0025] Figure 2 It is a schematic exploded view of the handle in the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the inner needle tube and the electrode head in the present invention;

[0027] Figure 4 It is a schematic diagram of the structure and cross-section of the needle head in the present invention;

[0028] Wherein: 1 - cable, 2 - handle, 3 - needle rod, 4 - needle tip, 5 - first negative pressure suction tube, 6 - second negative pressure suction tube, 7 - motor assembly, 8 - upper housing, 9 - lower housing, 10 - outer needle tube, 11 - cutting edge, 12 - third negative pressure channel tube, 13 - screw, 14 - inner needle tube, 15 - first negative pressure channel tube, 16 - thread, 17 - connector, 18 - first negative pressure interface, 19 - gear, 20 - second negative pressure channel tube, 21 - electrode head, 22 - second negative pressure interface, 23 - sealing sleeve, 24 - sampling groove, 25 - semi-circular electrode wire, 26 - insulating layer, 27 - suction hole, 28 - button. Detailed implementation manners

[0029] The following describes the detailed implementation manners of the present invention to facilitate those skilled in the art of this technology to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the detailed implementation manners. For those of ordinary skill in the art of this technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are within the scope of protection.

[0030] As Figure 1 shown, it is a schematic diagram of a biopsy needle based on electrode cutting according to the present invention, including a cable 1, a handle 2, a needle rod 3, and a needle tip 4 connected in sequence; wherein, the handle 2 is also connected with a first negative pressure suction tube 5 and a second negative pressure suction tube 6; the cable 1 is used to connect with an external power supply;

[0031] As Figure 2 shown, it is a schematic exploded view of the handle in the invention. As Figure 3 shown, it is a schematic diagram of the structure of the inner needle tube and the electrode head in the present invention. As Figure 4 shown, it is a schematic diagram of the structure and cross-section of the needle tip of the present invention; combining Figure 2 , Figure 3 and Figure 4 to specifically illustrate a biopsy needle based on electrode cutting according to the present invention:

[0032] As Figure 2 shown, the handle 2 includes a motor assembly 7, an upper housing 8, and a lower housing 9 that are clamped in sequence from top to bottom; the motor assembly 7 is connected with the cable 1; the needle rod 3 includes an outer needle tube 10, a cutting edge 11 arranged at one end of the outer needle tube 10, and a third negative pressure channel tube 12 arranged under the outer needle tube 10 and fitting with the outer needle tube 10; one ends of the outer needle tube 10 and the third negative pressure channel tube 12 are both connected with the handle 2; the needle tip 4 is connected with the cutting edge 11 end of the outer needle tube 10; the needle tip 4 is used to pierce the living tissue.

[0033] Between the upper housing 8 and the lower housing 9 of the handle 2, there are provided a screw 13, an inner needle tube 14, a first negative pressure channel tube 15, a first negative pressure interface 18 and a second negative pressure interface 22; a thread 16 is provided on the screw 13, the thread 16 is loosely arranged at one end of the screw 13 and densely arranged at the other end of the screw 13, a connector 17 and a gear 19 are provided at the loose end of the thread 16, the connector 17 connects the screw 13 and the inner needle tube 14, the gear 19 is connected to the motor assembly 7, one end of the inner needle tube 14 is connected to one end of the second negative pressure interface 22, the other end of the inner needle tube 14 is connected to the needle rod 3, one end of the first negative pressure channel tube 15 is connected to one end of the first negative pressure interface 18, the other end of the first negative pressure channel tube 15 communicates with the needle rod 3, the other end of the first negative pressure interface 18 is connected to the first negative pressure suction tube 5, and the other end of the second negative pressure interface 22 is connected to the second negative pressure suction tube 6;

[0034] Meanwhile, the motor assembly 7 is provided with a button 28, the upper housing 8 is provided with a sampling groove 24, the button 28 is used to start and stop the motor assembly 7, and the sampling groove 24 is used to store the biopsy tissue.

[0035] Specifically: when the screw 13 rotates, the connector 17 moves back and forth along the thread 16, moves fast at the loose part of the thread 16 and moves slowly at the dense part of the thread 16. When the connector 17 moves, it drives the inner needle tube 14 to move along the needle rod 3; the motor assembly 7 drives the screw 13 to rotate through the gear 19.

[0036] As Figure 3 shown, the inner needle tube 14 is specifically connected with a second negative pressure channel tube 20, an electrode head 21 and a sealing sleeve 23; one end of the inner needle tube 14 is connected to the electrode head 21, the electrode head 21 is placed inside the outer needle tube 10 of the needle rod 3, the other end of the inner needle tube 14 is connected to one end of the second negative pressure channel tube 20, and is slidably sealed with the second negative pressure channel tube 20 through the sealing sleeve 23, and the other end of the second negative pressure channel tube 20 is connected to the second negative pressure interface 22;

[0037] Among them, the electrode head 21 includes a semi-circular electrode wire 25 and an insulating layer 26; the insulating layer 26 is connected to both ends of the semi-circular electrode wire 25; the semi-circular electrode wire 25 is the positive electrode, the inner needle tube 14 is the negative electrode, and the semi-circular electrode wire 25 and the inner needle tube 14 form a plasma excitation bipolar structure for cutting tissue;

[0038] The sealing sleeve 23 is used to enable the inner needle tube 14 to slide along the second negative pressure channel tube 20;

[0039] As Figure 4As shown in the figure, one end of the inner needle tube 14 connecting the electrode head 21 passes through the sampling groove 24 of the upper housing 8 and is connected to one end of the outer needle tube 10. One end of the third negative pressure channel tube 12 is connected to the other end of the first negative pressure channel tube 15. The other ends of the outer needle tube 10 and the third negative pressure channel tube 12 are both connected to the needle head 4. A cutting edge 11 is provided on one side of the outer needle tube 10 close to the needle head 4, and a plurality of suction holes 27 are provided inside the needle bar 3 corresponding to the cutting edge 11 to communicate the outer needle tube 10 with the third negative pressure channel tube 12.

[0040] The working principle of a biopsy needle based on electrode cutting according to the present invention will be described below:

[0041] During use, by pressing the button 28 on the handle 2, the motor assembly 7 is started. The motor assembly 7 rotates the inner motor rotating gear 19 through the inner motor, and the gear 19 drives the screw 13 to rotate. When the screw 13 rotates, the inner needle tube 14 is pushed forward through the connector 17, so that the inner needle tube 14 passes through the outer needle tube 10 from the handle 2 through the sampling groove 24 and finally reaches the cutting edge 11 and seals the cutting edge 11. During this process, at the loose part of the thread 16 on the screw 13, the connector 17 drives the inner needle tube 14 to quickly reach the cutting edge 11. When reaching the cutting edge 11, due to the dense thread 16, the inner needle tube 14 will move forward slowly, which can improve the biopsy accuracy of the tissue. Under the assistance of imaging, the biopsy needle is punctured into the breast to reach the position to be biopsied;

[0042] When reaching the biopsy position, the inner needle tube 14 is controlled to withdraw from the cutting edge 11 through the motor assembly 7, and the negative pressure suction is started. The first negative pressure suction tube 5 passes through the first negative pressure interface 18, the first negative pressure channel tube 15, the third negative pressure channel tube 12 and the suction holes 27 to reach the cutting edge 11. Under the first negative pressure path, the tissue to be biopsied is attracted into the cutting edge 11 at the cutting edge 11. At this time, the motor assembly 7 is started to push the electrode head 21 of the inner needle tube 14 into the cutting edge 11 to cut the tissue. The cut tissue will enter the end of the inner needle tube 14. After the cutting is completed, the first negative pressure path is closed, and at the same time, the second negative pressure path is started. The second negative pressure suction tube 6 passes through the second negative pressure interface 22 and the second negative pressure channel tube 20. At the same time, driven by the motor assembly 7, the inner needle tube 14 withdraws from the cutting edge 11 and the outer needle tube 10 and returns to the handle 2 through the sampling groove 24. The start of the second negative pressure path is to attract the cut tissue to prevent the tissue from falling during the process of the inner needle tube 14 withdrawing from the cutting edge 11. When the inner needle tube 14 passes through the sampling groove 24, the end of the second negative pressure channel tube 20 pushes out the tissue at the position of the electrode head 21, and the tissue will stay in the sampling groove 24. At this time, the inner needle tube 14 enters the handle 2 to complete tissue sampling. The second negative pressure path is closed, and the biopsy tissue in the sampling groove 24 is taken out with tweezers to complete a sampling operation. By repeating the operation, multiple samplings can be performed.

[0043] The beneficial effects of the present invention are as follows: The present invention designs a biopsy needle based on electrode cutting. It uses an electrode head for electrode cutting instead of a rotating cutting blade, so there is no rotational movement, resulting in less noise. Moreover, it can achieve cutting while coagulating, reducing bleeding. At the same time, it can avoid the skin prolapsing into the sample slot before the cutter advances into the tissue, thus reducing shaving of the skin and minimizing subsequent pain and scarring.

Claims

1. A biopsy needle based on electrode cutting, characterized in that: It comprises a cable (1), a handle (2), a needle rod (3) and a needle (4) which are connected in sequence, wherein the handle (2) is connected to a first negative pressure suction tube (5) and a second negative pressure suction tube (6); The cable (1) is used to connect to an external power source; The handle (2) comprises a motor assembly (7), an upper shell (8) and a lower shell (9) which are sequentially clamped from top to bottom; the motor assembly (7) is connected to the cable (1); The needle rod (3) comprises an outer needle tube (10), a cutting edge (11) arranged at one end of the outer needle tube (10), and a third negative pressure channel tube (12) arranged under the outer needle tube (10) and in contact with the outer needle tube (10); one end of each of the outer needle tube (10) and the third negative pressure channel tube (12) is connected to the handle (2); The needle (4) is connected to one end of the cutting edge (11) of the outer needle tube (10); A screw rod (13), an inner needle tube (14), a first negative pressure channel tube (15), a first negative pressure interface (18) and a second negative pressure interface (22) are provided between the upper shell (8) and the lower shell (9) of the handle (2); The screw rod (13) is provided with a thread (16), the thread (16) is loosely arranged at one end of the screw rod (13), and densely arranged at the other end of the screw rod (13), the end of the loose thread (16) is provided with a connector (17) and a gear (19), the connector (17) connects the screw rod (13) and the inner needle tube (14), the gear (19) is connected to the motor assembly (7), one end of the inner needle tube (14) is connected to one end of the second negative pressure interface (22), the other end of the inner needle tube (14) is connected to the needle rod (3), one end of the first negative pressure channel tube (15) is connected to one end of the first negative pressure interface (18), the other end of the first negative pressure channel tube (15) is connected to the needle rod (3), the other end of the first negative pressure interface (18) is connected to the first negative pressure suction tube (5), and the other end of the second negative pressure interface (22) is connected to the second negative pressure suction tube (6); When the screw rod (13) rotates, the connector (17) moves forward and backward along the thread (16), moves faster at a sparse portion of the thread (16) and moves slower at a dense portion of the thread (16). When the connector (17) moves, it drives the inner needle tube (14) to move along the needle rod (3); the motor assembly (7) drives the screw rod (13) to rotate via the gear (19); The inner needle tube (14) is connected to a second negative pressure channel tube (20), an electrode head (21) and a sealing sleeve (23); One end of the inner needle tube (14) is connected to the electrode head (21), and the electrode head (21) is placed inside the outer needle tube (10) of the needle rod (3); the other end of the inner needle tube (14) is connected to one end of the second negative pressure channel tube (20), and is slidably sealed with the second negative pressure channel tube (20) through a sealing sleeve (23); the other end of the second negative pressure channel tube (20) is connected to the second negative pressure interface (22); The electrode head (21) comprises a semi-annular electrode wire (25) and an insulating layer (26); the insulating layer (26) is connected to both ends of the semi-annular electrode wire (25); The sealing sleeve (23) is used to enable the inner needle tube (14) to slide along the second negative pressure channel tube (20); The semi-annular electrode wire (25) is a positive electrode, the inner needle tube (14) is a negative electrode, and the semi-annular electrode wire (25) and the inner needle tube (14) form a plasma excitation bipolar structure for cutting tissue.

2. The electrode-cutting-based biopsy needle according to claim 1, characterized in that: The motor assembly (7) is provided with a button (28), and the button (28) is used to start and shut down the motor assembly (7); The upper shell (8) is provided with a sampling groove (24), and the sampling groove (24) is used to store biopsy tissue.

3. The electrode-cutting-based biopsy needle according to claim 2, characterized in that: One end of the inner needle tube (14) connected to the electrode head (21) passes through the sampling slot (24) of the upper shell (8) and is connected to one end of the outer needle tube (10); one end of the third negative pressure channel tube (12) is connected to the other end of the first negative pressure channel tube (15); the other ends of the outer needle tube (10) and the third negative pressure channel tube (12) are both connected to the needle head (4); a cutting edge (11) is provided on a side of the outer needle tube (10) close to the needle head (4); and a plurality of suction holes (27) are provided inside the needle rod (3) corresponding to the cutting edge (11), so that the outer needle tube (10) is connected to the third negative pressure channel tube (12).

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