Negative pressure biopsy sampling needle

Abstract

The invention provides a negative pressure biopsy sampling needle applied to the technical field of medical apparatus and instruments, the negative pressure biopsy sampling needle is provided with a first pressing plate, a second pressing plate, a sampling assembly, a negative pressure suction assembly, a lever transmission mechanism and a cam transmission mechanism, and the sampling assembly comprises an outer needle and an inner needle which are coaxially and rotatably connected and is used for rotary cutting sampling; the negative pressure suction assembly comprises a piston barrel and a piston rod, the piston barrel is communicated with the outer needle and used for generating negative pressure to suck tissues into the sampling assembly, the first pressing plate is arranged between the piston rod and the piston barrel in a swinging mode through a lever transmission mechanism, and the first pressing plate is pressed to drive the piston rod to move upwards to generate negative pressure to suck the tissues; the cam transmission mechanism is arranged between the second pressing plate and the inner needle, the second pressing plate is pressed to drive the inner needle to rotate so as to cut off sucked tissue, during operation, sampling can be achieved only by pressing the first pressing plate and the second pressing plate in sequence with one hand, and negative pressure and sampling operation can be achieved through single-person or even single-hand operation.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a negative pressure biopsy sampling needle. Background Technology

[0002] Negative pressure biopsy needles are used to draw tissue into a needle through a negative pressure device, and then cut the tissue to obtain a sample.

[0003] Because the sampling process requires the simultaneous completion of three core actions—"sampling needle positioning and fixing," "negative pressure establishment," and "sampling"—the traditional operating mode demands a high degree of human coordination. During sampling, at least one hand must be used to hold the sampling needle body stably, while the other hand must be used to pull the syringe plunger upward to establish and maintain negative pressure. In addition, one hand or one person is needed to perform the sampling operation. In other words, it is difficult for the operator to handle multiple actions with both hands alone, and often two operators are required to work together. This not only increases labor costs but also creates the problem of the two operators operating at different paces, which may lead to insufficient tissue sample volume or sampling failure.

[0004] In summary, current biopsy sampling techniques require at least two hands or even two people to operate simultaneously, which not only increases labor costs but also leads to insufficient tissue sample volume or sampling failure due to asynchronous operation rhythms. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this application is to overcome the difficulty that biopsy sampling in the prior art requires at least two hands or even two people to operate at the same time. Compared with the prior art, it provides a negative pressure biopsy sampling needle, which simplifies the biopsy sampling operation and enables sampling to be carried out by a single person or even a single hand.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0007] A negative pressure biopsy sampling needle, comprising: The sampling assembly includes an outer needle and an inner needle coaxially rotatably connected; the outer needle is hollow and has a tip for puncture and an opening for embedding in tissue, and a through clearance hole is also provided on the side wall of the outer needle; the inner needle includes a lever extending radially through the clearance hole to the outside, and a blade for cutting the tissue embedded in the opening when rotated. A negative pressure suction assembly includes a piston cylinder and a piston rod; one end of the piston cylinder is connected to the outer needle to form a connected airflow chamber; the piston rod is slidably sealed inside the piston cylinder to change the volume of the airflow chamber to adjust the air pressure at the opening; A first pressing plate is pivotally connected to the piston cylinder or its connector, such that the non-pressing end of the first pressing plate extends below the end of the piston rod located outside the piston cylinder; A lever transmission mechanism is disposed on the piston cylinder and is connected to the first pressing plate and the piston rod. The lever transmission mechanism is used to convert the driving force of the first pressing plate itself toward the sampling component into a driving force that drives the piston rod to move away from the sampling component. The second pressing plate is located on one side of the first pressing plate; A cam drive mechanism connects the second pressing plate and the inner needle, converting the driving force of the second pressing plate toward the sampling component into a driving force to rotate the inner needle, so that the inner needle cuts the tissue embedded in the opening.

[0008] Furthermore, the lever transmission mechanism includes a fulcrum connecting the first pressing plate and the piston cylinder, and the first pressing plate rotates about the fulcrum when subjected to a pressing force toward the sampling assembly.

[0009] Furthermore, the cam transmission mechanism includes: The cam body is coaxially fixed on the lever, and a guide groove extending in a spiral or inclined manner is provided on its outer peripheral wall; The drive slide rod is restricted to reciprocating only in a direction parallel to the axis of the piston cylinder. The drive end of the drive slide rod is slidably engaged inside the guide groove, and the end of the drive slide rod away from the guide groove is fixedly connected to the second pressing plate. A constraint ring is fixedly sleeved on the outside of the piston cylinder, and the drive slide rod passes through the constraint ring and is slidably connected to the constraint ring; A spring is sleeved on the outside of the drive slide rod, and the spring connects the constraint ring and the second pressing plate, for applying a restoring force to the second pressing plate; The drive slide rod and the cam body form a cylindrical cam mechanism. When the first pressing plate is pressed, the first pressing plate drives the piston rod to move so that a negative pressure is generated at the opening to suck up tissue. Then, the second pressing plate is pressed, and the second pressing plate overcomes the elastic force of the spring to drive the drive slide rod to move axially. The drive slide rod squeezes the side wall of the guide groove, thereby driving the cam body to drive the lever and the inner needle to rotate circumferentially relative to the outer needle, so as to spin-cut the tissue sucked into the opening.

[0010] Furthermore, the inner needle is configured as a semi-circular structure, which covers the opening when rotated.

[0011] Furthermore, the cam body is configured as an arc shape, and the cam body is coaxially arranged with the sampling needle.

[0012] Furthermore, a ball bearing is rotatably provided at the location where the first pressing plate and the piston rod overlap at one end outside the piston cylinder, and the ball bearing contacts the end of the piston rod.

[0013] Furthermore, an installation channel is provided on the outer needle, one end of which communicates with the clearance hole, and the other end extends to the end of the inner needle near the piston cylinder. The width of the installation channel allows the lever to pass through axially.

[0014] Compared to existing technologies, the advantages of this application are: This invention connects the first pressing plate and the piston rod through a lever transmission mechanism, and connects the second pressing plate and the inner needle through a cam transmission mechanism. This converts the driving force of pressing the first pressing plate into the driving force of lifting the piston rod and rotating the inner needle, and the driving force of pressing the second pressing plate into the driving force of rotating the inner needle. The second pressing plate is located on one side of the first pressing plate, allowing the user to achieve the negative pressure suction of the outer needle and the rotation and cutting of the inner needle by pressing the first and second pressing plates in sequence with one hand. This makes the invention operable by one person or even one hand. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 For the purposes of this application Figure 1 Enlarged view of a portion of the structure at point A; Figure 3 This is a schematic diagram of the overall structure of the first and second pressing plates after pressing in this application. Figure 4 This is a partial cross-sectional view of the piston cylinder and sampling needle of this application; Figure 5 This is a partial cross-sectional view of the piston cylinder and sampling needle after the first pressing plate of this application is pressed; Figure 6 This is a schematic diagram of the first pressing plate and ball bearing structure of this application.

[0016] Explanation of the labels in the diagram: 1. Sampling assembly; 11. Outer needle; 12. Inner needle; 13. Opening; 14. Clearance hole; 15. Lever; 16. Installation channel; 2. Negative pressure suction assembly; 21. Piston cylinder; 22. Piston rod; 3. First pressing plate; 4. Lever transmission mechanism; 41. Fulcrum; 5. Second pressing plate; 6. Cam transmission mechanism; 61. Cam body; 62. Guide groove; 63. Drive slide rod; 64. Constraint ring; 65. Spring; 7. Ball bearing. Detailed Implementation

[0017] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0018] This invention provides a negative pressure biopsy sampling needle; please refer to [link / reference]. Figure 1-6 The main feature is that by changing the direction of force during negative pressure operation, negative pressure operation can be achieved with one hand. The sampling needle is set to a sampling method in which the outer needle and inner needle are nested, and the inner needle rotates inside the outer needle. By rotating the inner needle from the outside with one hand, cutting and sampling can be achieved, thus enabling sampling by one person or even one hand.

[0019] The sampling needle includes: The sampling assembly 1 includes an outer needle 11 and an inner needle 12 coaxially rotatably connected; the outer needle 11 is hollow and has a tip for puncture and an opening 13 for embedding tissue, and a through clearance hole 14 is also provided on the side wall of the outer needle 11; the inner needle 12 includes a lever 15 extending radially through the clearance hole 14 to the outside, and a blade for cutting the tissue embedded in the opening 13 when rotated. The negative pressure suction assembly 2 includes a piston cylinder 21 and a piston rod 22; one end of the piston cylinder 21 is connected to the outer needle 11, thereby forming a connected airflow chamber; the piston rod 22 is slidably sealed inside the piston cylinder 21 to change the volume of the airflow chamber to adjust the air pressure at the opening 13. The piston rod 22 is provided with a rubber ring at the contact position with the piston cylinder 21 for sealing, and the piston rod 22 can stay in the piston cylinder 21 by relying on the resistance of the inner wall of the piston cylinder 21 after moving upward, and will not move downward after the force is stopped.

[0020] The first pressing plate 3 is pivotally connected to the piston cylinder 21 or its connector, and the non-pressing end of the first pressing plate 3 extends to the lower end of the piston rod 22 located outside the piston cylinder 21; The lever transmission mechanism 4 is mounted on the piston cylinder 21 and is connected to the first pressing plate 3 and the piston rod 22. The lever transmission mechanism 4 is used to convert the driving force of the first pressing plate 3 towards the sampling component 1 into the driving force that drives the piston rod 22 to move away from the sampling component 1. The second pressing plate 5 is located on one side of the first pressing plate 3; The second pressing plate 5 is adjacent to the first pressing plate 3, and the two plates do not interfere with each other when the second pressing plate 5 and the first pressing plate 3 are pressed.

[0021] The cam transmission mechanism 6 connects the second pressing plate 5 and the inner needle 12, and converts the driving force of the second pressing plate 5 toward the sampling component 1 into the driving force to drive the inner needle 12 to rotate, so that the inner needle 12 cuts the tissue embedded in the opening 13.

[0022] The lever transmission mechanism 4 includes a fulcrum 41 connecting the first pressing plate 3 and the piston cylinder 21, and the first pressing plate 3 rotates about the fulcrum 41 when subjected to a pressing force toward the sampling assembly 1.

[0023] Cam transmission mechanism 6 includes: The cam body 61 is coaxially fixed on the lever 15, and a guide groove 62 extending in a spiral or inclined manner is provided on its outer peripheral wall; The drive slide rod 63 is restricted to reciprocating only in a direction parallel to the axis of the piston cylinder 21. The drive end of the drive slide rod 63 is slidably fitted inside the guide groove 62, and the end of the drive slide rod 63 away from the guide groove 62 is fixedly connected to the second pressing plate 5. When the lever 15 is at the highest point in the guide groove 62, the lever 15 is at the end of one end of the relief hole 14. When the lever 15 moves down to the lowest point in the guide groove 62, the lever 15 rotates to the other end of the relief hole 14.

[0024] The constraint ring 64 is fixedly sleeved on the outside of the piston cylinder 21, and the drive slide rod 63 passes through the constraint ring 64 and is slidably connected to the constraint ring 64. Spring 65 is sleeved on the outside of drive slide bar 63, and spring 65 is connected to constraint ring 64 and second pressing plate 5, for applying reset spring force to second pressing plate 5; The drive slide 63 and the cam body 61 form a cylindrical cam mechanism. When the first press plate 3 is pressed, the first press plate 3 drives the piston rod 22 to move so that a negative pressure is generated at the opening 13 to suck up tissue. Then the second press plate 5 is pressed, and the second press plate 5 overcomes the elastic force of the spring 65 to drive the drive slide 63 to move axially. The drive slide 63 squeezes the side wall of the guide groove 62, thereby driving the cam body 61 to drive the lever 15 and the inner needle 12 to rotate circumferentially relative to the outer needle 11, so as to spin-cut the tissue sucked into the opening 13.

[0025] The inner needle 12 is configured as a semi-circular structure, and the inner needle 12 can cover the opening 13 when rotated.

[0026] The inner needle 12 does not rotate freely inside the outer needle 11. It only rotates when driven by an external force. When the lever 15 is at the end of one end of the relief hole 14, the inner needle 12 does not coincide with the opening 13 on the outer needle 11, and the opening 13 is in the open state. When the lever 15 rotates to the other end of the relief hole 14, the inner needle 12 rotates inside the outer needle 11. At this time, the inner needle 12 completely covers the opening 13 of the outer needle 11, and the opening 13 is in the closed state.

[0027] The cam body 61 is set in an arc shape, and the cam body 61 is coaxial with the outer needle.

[0028] In this manner, after the operator inserts the sampling component 1 into the target location, the index and middle fingers of one hand are placed below the end of the piston cylinder 21, and the thumb is placed on the first pressing plate 3. The operator presses down on the first pressing plate 3, causing the first pressing plate 3 to swing around the fulcrum 41, which drives the piston rod 22 to move upward, drawing out the air from the inner needle 12 and the outer needle 11 and generating negative pressure. Under the action of negative pressure, the tissue enters the interior of the inner needle 12 through the opening 13 until the first pressing plate 3 is stopped being squeezed. The piston rod 22 stops at that height due to the resistance between it and the piston cylinder 21 and no longer moves.

[0029] At this time, the thumb leaves the first pressing plate 3 and moves to the second pressing plate 5 on the side, and presses down on the second pressing plate 5. The second pressing plate 5 moves down and drives the drive slide rod 63 to slide in the guide slide groove 62. Since the guide slide groove 62 is inclined, when the drive slide rod 63 moves down, it will drive the cam body 61 to rotate in the horizontal direction, thereby driving the inner needle 12 to rotate inside the outer needle 11. The blade of the inner needle 12 passes through the opening 13 and completely covers the opening 13. The blade of the inner needle 12 cuts off the tissue sucked into the inner needle 12. Finally, the sampling component 1 is pulled out, and the sampling operation can be realized.

[0030] This setup allows for both negative pressure and sampling operations to be performed by pressing the first pressure plate 3 and the second pressure plate 5 with the thumb of one hand. In other words, the entire sampling process can be completed by a single person or even with one hand, which not only saves labor costs but also further simplifies the sampling operation, making it more convenient and simple.

[0031] To reduce the friction between the first pressing plate 3 and the piston rod 22, making negative pressure operation easier and more convenient for one-handed operation, the following embodiment is provided: Specifically, a ball bearing 7 is rotatably disposed at the end of the first pressing plate 3 and the piston rod 22 that overlaps at the outer end of the piston cylinder 21, and the ball bearing 7 contacts the end of the piston rod 22.

[0032] In this way, the first pressing plate 3 is pressed down to make it swing, and the ball 7 rolls at the end of the piston rod 22. The friction between the ball 7 and the piston rod 22 is rolling friction. If the first pressing plate 3 directly contacts the end of the piston rod 22, then the friction between the first pressing plate 3 and the end of the piston rod 22 is sliding friction. Changing sliding friction to rolling friction reduces the friction between the first pressing plate 3 and the end of the piston rod 22, making the pressing operation more effortless, and thus making negative pressure operation easier and more convenient.

[0033] To facilitate the assembly of the inner needle 12 and the outer needle 11, the following embodiments are provided: Specifically, an installation channel 16 is provided on the outer needle 11. One end of the installation channel 16 communicates with the relief hole 14, and the other end extends to the end of the inner needle 12 near the piston cylinder 21. The width of the installation channel 16 allows the lever 15 to pass through axially.

[0034] In this way, when assembling the outer needle 11 and the inner needle 12, the inner needle 12 is placed inside the outer needle 11, and the lever 15 is allowed to enter the clearance hole 14 through the mounting channel 16, thus achieving the assembly of the outer needle 11 and the inner needle 12.

[0035] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and its improved concept, should be covered within the scope of protection of this application.

Claims

1. A negative pressure biopsy sampling needle, characterized in that, include: The sampling assembly (1) includes an outer needle (11) and an inner needle (12) coaxially rotatably connected; the outer needle (11) is hollow and has a tip for puncture and an opening (13) for embedding into tissue, and a through clearance hole (14) is also provided on the side wall of the outer needle (11); the inner needle (12) includes a lever (15) extending radially through the clearance hole (14) to the outside, and a blade for cutting off the tissue embedded in the opening (13) when rotated; The negative pressure suction assembly (2) includes a piston cylinder (21) and a piston rod (22); one end of the piston cylinder (21) is connected to the outer needle (11) to form a connected airflow chamber; the piston rod (22) is slidably sealed inside the piston cylinder (21) to change the volume of the airflow chamber to adjust the air pressure at the opening (13); A first pressing plate (3) is pivotally connected to the piston cylinder (21) or its connector, such that the non-pressing end of the first pressing plate (3) extends below the end of the piston rod (22) located outside the piston cylinder (21); A lever transmission mechanism (4) is provided on the piston cylinder (21) and is connected to the first pressing plate (3) and the piston rod (22). The lever transmission mechanism (4) is used to convert the driving force of the first pressing plate (3) towards the sampling component (1) into a driving force that drives the piston rod (22) to move away from the sampling component (1). The second pressing plate (5) is located on one side of the first pressing plate (3); The cam transmission mechanism (6) connects the second pressing plate (5) and the inner needle (12), and converts the driving force of the second pressing plate (5) towards the sampling component (1) into a driving force to drive the inner needle (12) to rotate, so that the inner needle (12) cuts the tissue embedded in the opening (13).

2. The negative pressure biopsy sampling needle according to claim 1, characterized in that: The lever transmission mechanism (4) includes a fulcrum (41) connecting the first pressing plate (3) and the piston cylinder (21), and the first pressing plate (3) rotates about the fulcrum (41) when subjected to pressing force toward the sampling assembly (1).

3. The negative pressure biopsy sampling needle according to claim 1, characterized in that: The cam transmission mechanism (6) includes: The cam body (61) is coaxially fixed on the lever (15), and a guide groove (62) extending in a spiral or inclined manner is provided on its outer peripheral wall. The drive slide rod (63) is restricted to reciprocating only in a direction parallel to the axis of the piston cylinder (21). The drive end of the drive slide rod (63) is slidably fitted inside the guide groove (62). The end of the drive slide rod (63) away from the guide groove (62) is fixedly connected to the second pressing plate (5). A constraint ring (64) is fixedly sleeved on the outside of the piston cylinder (21), and the drive slide rod (63) passes through the constraint ring (64) and is slidably connected to the constraint ring (64). A spring (65) is sleeved on the outside of the drive slide bar (63), and the spring (65) connects the constraint ring (64) and the second pressing plate (5) to apply a restoring force to the second pressing plate (5); The drive slide rod (63) and the cam body (61) constitute a cylindrical cam mechanism. When the first press plate (3) is pressed, the first press plate (3) drives the piston rod (22) to move so that a negative pressure is generated at the opening (13) to suck up tissue. Then the second press plate (5) is pressed, and the second press plate (5) overcomes the elastic force of the spring (65) to drive the drive slide rod (63) to move axially. The drive slide rod (63) squeezes the side wall of the guide groove (62), thereby driving the cam body (61) to drive the lever (15) and the inner needle (12) to rotate circumferentially relative to the outer needle (11) to spin-cut the tissue sucked into the opening (13).

4. The negative pressure biopsy sampling needle according to claim 1, characterized in that: The inner needle (12) is configured as a semi-circular structure, and the inner needle (12) can cover the opening (13) when rotated.

5. The negative pressure biopsy sampling needle according to claim 3, characterized in that: The cam body (61) is set in an arc shape, and the cam body (61) is coaxially arranged with the sampling needle.

6. The negative pressure biopsy sampling needle according to claim 1, characterized in that: A ball bearing (7) is rotatably provided at the position where the first pressing plate (3) and the piston rod (22) overlap at one end outside the piston cylinder (21), and the ball bearing (7) contacts the end of the piston rod (22).

7. The negative pressure biopsy sampling needle according to claim 1, characterized in that: An installation channel (16) is provided on the outer needle (11). One end of the installation channel (16) is connected to the relief hole (14), and the other end extends to the end of the inner needle (12) near the piston cylinder (21). The width of the installation channel (16) allows the lever (15) to pass through axially.

Images