Torsionally rotating biopsy needle

Abstract

The application discloses a torsion rotary biopsy needle and relates to the field of medical devices, which comprises a base body, a torsion rotating mechanism, a piston mechanism and a needle tube sampling device; the torsion rotating mechanism and the piston mechanism are both installed on the base body; the piston mechanism comprises a pull rod piston and a needle cylinder, and the pull rod piston penetrates into the inside of the needle cylinder; the needle tube sampling device comprises an inner needle and an outer needle tube, the outer needle tube is fixedly connected to the needle cylinder and is closed at the front end by a needle tip, and the inner needle penetrates into the inside of the outer needle tube; the front end of the inner needle is provided with a rotary blade, a slot hole is formed in the position corresponding to the rotary blade on the outer needle tube, and the initial position of the rotary blade covers the slot hole; the torsion rotating mechanism can drive the inner needle to rotate and drive the pull rod piston to reciprocate in the needle cylinder. The application has the advantages that the removed tissue section is not mixed with the tissues of other parts, the accuracy of biopsy is ensured, and the trauma of the patient is reduced and the pain of the patient after the anesthesia is reduced.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a torsion rotary biopsy needle. Background Technology

[0002] Currently, disposable biopsy needles are suitable for obtaining tissue samples from soft tissue for testing specific sites. During a biopsy, the needle penetrates the skin to reach the area requiring biopsy, and then the needle is pulled back 3-5 times to extract a sample of tissue from that site. However, current biopsy needle punctures use an impact-cutting sampling method, which can easily cause the extracted tissue samples to mix with tissue from other sites, reducing the accuracy of the biopsy. Furthermore, the impact-cutting method during biopsy sampling increases patient trauma, especially in sensitive areas such as the throat where the operating space is limited, potentially causing secondary injury to the patient.

[0003] Patent document CN115813453A discloses a negative pressure aspiration biopsy needle, which includes a negative pressure device, an outer needle, and a needle hub. The outer needle has a hollow structure. The negative pressure device is connected to the outer needle through the needle hub. The needle hub is equipped with a switch for opening and closing the communication channel between the negative pressure device and the outer needle. This biopsy needle can accurately control the amount of sample taken, making it convenient for doctors with different clinical experience to use. However, the tip of the outer needle is not sealed, which may lead to the collection of tissue from other sites, increasing the difficulty of detection. Summary of the Invention

[0004] The technical problem to be solved by this invention is how to ensure the accuracy of biopsy and reduce patient trauma.

[0005] This invention solves the above-mentioned technical problems through the following technical means: a torsion rotary biopsy needle, comprising a base, a torsion rotation mechanism, a piston mechanism, and a needle tube sampling device; the torsion rotation mechanism and the piston mechanism are both mounted on the base; the piston mechanism includes a pull rod piston and a syringe barrel, the pull rod piston being inserted into the syringe barrel; the needle tube sampling device includes an inner needle and an outer needle tube, the outer needle tube being fixedly connected to the syringe barrel and its front end being closed by a needle tip, the inner needle being inserted into the outer needle tube; the front end of the inner needle is provided with a rotating blade, and a slot is formed on the outer needle tube at a position corresponding to the rotating blade, the initial position of the rotating blade covering the slot; the torsion rotation mechanism can drive the inner needle to rotate and drive the pull rod piston to reciprocate within the syringe barrel. When this biopsy needle is inserted into and withdrawn from the body, the inner and outer needle tubes form a closed cylinder, which provides excellent protection and ensures that the extracted tissue sections are not contaminated with tissue from other parts of the body, thus ensuring the accuracy of the biopsy. Moreover, the tissue section extraction is completed in one operation, reducing the number of times the needle is pulled back, which can reduce patient trauma and the pain after the anesthesia wears off.

[0006] Preferably, the torque rotation mechanism includes a mounting base, a torsion spring, a pull ring, a pull line, and a spool; the spool is rotatably connected to the mounting base; one end of the torsion spring is fixedly connected to the spool, and the other end of the torsion spring is fixedly connected to the base; the pull line is wound around the spool, one end of the pull line is fixedly connected to the spool, and the other end of the pull line is fixedly connected to a pull ring; the inner needle is fixedly connected to the spool.

[0007] Preferably, the mounting base includes a base, a bearing, and a central shaft. The base is fixedly connected to the base body, the central shaft is fixedly connected to the base, and the reel is rotatably connected to the central shaft via the bearing.

[0008] Preferably, the piston mechanism further includes a cam and rollers; the cam is fixedly connected to the reel, and the outer ring of the cam has two symmetrically arranged spiral grooves; the pull rod piston has a pull rod at one end outside the syringe, and two rollers are installed at the end of the pull rod, with the two rollers respectively contacting the two spiral grooves of the cam.

[0009] Preferably, the spool includes a spool body, a mounting flange, and a mounting boss. The mounting boss is located at the center of the front end face of the spool body, and the mounting flange is located around the mounting boss on the front end face of the spool body. The cam is fixedly connected to the mounting flange. The cam has a hollow structure and covers the outside of the mounting boss. The inner pin is fixedly connected to the mounting boss and passes through the cam and the pull rod piston in sequence.

[0010] Preferably, the reel further includes a fixing key and a mounting groove. The front end face of the mounting boss is provided with a mounting groove. The fixing key matches the mounting groove, and the inner needle is fixedly connected in the mounting groove by the fixing key.

[0011] Preferably, the reel includes a reel body and a groove, the outer ring of the reel body has a groove, the pull wire is wound in the groove, and one end of the pull wire is fixedly connected to the reel body.

[0012] Preferably, the spool includes a spool body and a stop block, the stop block is provided on the rear end face of the spool body, and one end of the torsion spring is fixed to the stop block by a snap-fit ​​method.

[0013] Preferably, the end of the pull rod piston located inside the syringe is made of flexible rubber material.

[0014] Preferably, the base includes a handle and a support, the support is fixedly connected to the handle, and the torque rotation mechanism and the piston mechanism are both mounted on the support.

[0015] The advantages of this invention are as follows: When the biopsy needle is inserted into and withdrawn from the body, the inner needle and the outer needle tube form a closed cylinder, which plays a good protective role, so that the extracted tissue slices will not be mixed with tissues from other parts of the body, thus ensuring the accuracy of the biopsy; moreover, the tissue slice extraction operation is completed in one go, reducing the number of needle pull-backs, which can reduce patient trauma and reduce the pain after the anesthesia wears off. Attached Figure Description

[0016] Figure 1 This is a first-angle isometric schematic diagram of a torque rotary biopsy needle according to an embodiment of the present invention.

[0017] Figure 2 This is an isometric schematic diagram of the second angle of the removal cam and piston of the torque rotary biopsy needle according to an embodiment of the present invention.

[0018] Figure 3 This is a partial cross-sectional schematic diagram of the torsion rotary biopsy needle according to an embodiment of the present invention.

[0019] Figure 4 This is a partial schematic diagram of point A of the needle sampling device according to an embodiment of the present invention.

[0020] Figure 5 This is a partial schematic diagram of the front end of the inner needle in an embodiment of the present invention.

[0021] Figure 6 This is a first-angle isometric schematic diagram of the reel in an embodiment of the present invention.

[0022] Figure 7 This is an isometric view of the second angle of the removal of the fixing key by the thread wheel according to an embodiment of the present invention.

[0023] Figure 8 This is an isometric schematic diagram of the pull rod piston and roller in an embodiment of the present invention.

[0024] Figure 9 This is a partial isometric view of the syringe according to an embodiment of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0026] like Figures 1 to 9 As shown in the figure, an embodiment of the present invention discloses a torque-driven biopsy needle, including a base, a torque rotation mechanism, a piston mechanism, and a needle sampling device.

[0027] The base includes a handle 1 and a support 22; the handle 1 is designed in the form of a pistol stock for easy gripping; the support 22 is fixedly connected to the handle 1, and the torque rotation mechanism and the piston mechanism are both mounted on the support 22.

[0028] The torque rotation mechanism includes a torsion spring 4, a pull ring 8, a pull wire 9, a mounting base, and a reel. The mounting base includes a base 2, bolts 3, bearings 5, and a central shaft 7. The reel includes a reel body 6, a fixing key 14, a mounting flange 17, a wire groove 18, a mounting boss 19, a mounting groove 20, and a stop 21. The base 2 is fixedly connected to the support 22. The bolts 3 are hexagon socket head cap screws. The central shaft 7 is fixedly connected to the base 2 by the bolts 3. The reel body 6 is rotatably connected to the central shaft 7 by the bearing 5. The rear end face of the reel body 6 is provided with a stop 21. One end of the torsion spring 4 is fixed to the stop 21 by a snap-fit ​​mechanism, and the other end of the torsion spring 4... The puller body 6 is fixedly connected to the support 22. The outer ring of the puller body 6 has a groove 18. The pull line 9 is wound in the groove 18. One end of the pull line 9 is fixedly connected to the puller body 6, and the other end of the pull line 9 is fixedly connected to a pull ring 8. When the pull ring 8 is pulled, the pull line 9 drives the puller body 6 to rotate, causing the torsion spring 4 to store energy. When the pull ring 8 is released, the puller body 6 quickly and automatically reverses to the initial position under the action of the torsion spring 4. The center of the front end face of the puller body 6 is provided with a mounting boss 19. The front end face of the puller body 6 is provided with a mounting flange 17 around the mounting boss 19. The front end face of the mounting boss 19 is provided with a T-shaped mounting groove 20. The fixing key 14 matches the mounting groove 20.

[0029] The piston mechanism includes a cam 10, a pull rod piston 11, rollers 12, and a syringe 13. The cylindrical cam 10 is fixedly connected to the mounting flange 17. The cam 10 is hollow and covers the outside of the mounting boss 19. Two spiral grooves are symmetrically opened on the outer ring of the cam 10. The syringe 13 is fixedly connected to the support 22. The pull rod piston 11 passes into the syringe 13. The end of the pull rod piston 11 outside the syringe 13 is provided with a U-shaped pull rod. Two rollers 12 are installed at the end of the pull rod. The two rollers 12 respectively contact the two spiral grooves of the cam 10. The end of the pull rod piston 11 inside the syringe 13 is made of flexible rubber material to ensure airtightness. When the cam 10 is rotated by the wheel body 6, the rollers 12 slide in the spiral grooves, thereby driving the pull rod piston 11 to make linear reciprocating motion inside the syringe 13.

[0030] The syringe sampling device includes an inner needle 15 and an outer needle tube 16. The inner needle 15 is fixedly connected to the mounting groove 20 by a fixing key 14 and passes through the cam 10 and the pull rod piston 11 in sequence. The reel body 6 can drive the inner needle 15 to rotate. The outer needle tube 16 is fixedly connected to the syringe 13 and its front end is closed by a needle tip. The inner needle 15 is a hollow, slender cylindrical structure and penetrates into the interior of the outer needle tube 16. The front end of the inner needle 15 is provided with a rotating blade, which has a slicing function. A slot is opened on the outer needle tube 16 at a position corresponding to the rotating blade. The initial position of the rotating blade covers the slot.

[0031] Working principle: Before the biopsy needle is inserted into the body for sampling, the rotating blade at the front end of the inner needle 15 covers the slot on the outer needle tube 16, forming a closed cylinder to prevent the patient's biological tissue from entering the syringe 13. The biopsy needle can be operated by one person. After the biopsy needle is inserted into the body and reaches the sampling position, the left hand holds the handle 1 and the right hand pulls the pull ring 8. The pull line 9 drives the spool body 6 to rotate, which causes the torsion spring 4 to store energy. At this time, the spool body 6 drives the inner needle 15 to rotate. The inner needle 15 cuts the biological tissue and opens the slot on the outer needle tube 16 to form a sampling channel. At the same time, the cam 10 drives the pull rod piston 11 to move backward in the syringe 13, creating a negative pressure in the syringe 13, and the biological tissue is drawn into the syringe 13. Then, the right hand releases the pull ring 8, and the spool body 6 quickly and automatically reverses to the initial position under the action of the torsion spring 4. At this time, the spool body 6 drives the inner needle 15 to rotate in the opposite direction. The inner needle 15 automatically cuts the biological tissue and seals the biological tissue in the outer needle tube 16 after returning to the initial position.

[0032] When the biopsy needle is inserted into and withdrawn from the body, the inner needle 15 and the outer needle tube 16 form a closed cylinder, which plays a good protective role, ensuring that the extracted tissue slices are not mixed with tissues from other parts of the body, thus ensuring the accuracy of the biopsy. Moreover, the tissue slice extraction operation is completed in one go, reducing the number of times the needle is pulled back, which can reduce patient trauma and the pain after the anesthesia wears off.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A torque-roticulating biopsy needle, characterized by: The device includes a base, a torque rotation mechanism, a piston mechanism, and a syringe sampling device. Both the torque rotation mechanism and the piston mechanism are mounted on the base. The piston mechanism includes a pull rod piston and a syringe barrel, with the pull rod piston penetrating the syringe barrel. The syringe sampling device includes an inner needle and an outer needle tube. The outer needle tube is fixedly connected to the syringe barrel and its front end is closed by a needle tip. The inner needle penetrates the outer needle tube. The front end of the inner needle has a rotating blade, and a slot is formed on the outer needle tube at a position corresponding to the rotating blade. The initial position of the rotating blade covers the slot. The torque rotation mechanism can drive the inner needle to rotate and also drive the pull rod piston. The piston reciprocates within the syringe. The torque rotation mechanism includes a mounting base, a torsion spring, a pull ring, a pull wire, and a spool. The spool is rotatably connected to the mounting base. One end of the torsion spring is fixedly connected to the spool, and the other end is fixedly connected to the base. The pull wire is wound around the spool, with one end fixedly connected to the spool and the other end fixedly connected to the pull ring. The inner needle is fixedly connected to the spool. The piston mechanism also includes a cam and rollers. The cam is fixedly connected to the spool, and its outer ring has two symmetrically arranged spiral grooves. The piston rod piston has a pull rod at one end outside the syringe, and two rollers are installed at the end of the pull rod, with the two rollers respectively contacting the two spiral grooves of the cam.

2. The torque-roticulating biopsy needle of claim 1, wherein: The mounting base includes a base, a bearing, and a central shaft. The base is fixedly connected to the base body, the central shaft is fixedly connected to the base, and the reel is rotatably connected to the central shaft through the bearing.

3. The torsion rotary biopsy needle as described in claim 1, characterized in that: The spool includes a spool body, a mounting flange, and a mounting boss. The mounting boss is located at the center of the front end face of the spool body, and the mounting flange is located around the mounting boss on the front end face of the spool body. The cam is fixedly connected to the mounting flange. The cam has a hollow structure and covers the outside of the mounting boss. The inner pin is fixedly connected to the mounting boss and passes through the cam and the pull rod piston in sequence.

4. The torsion rotary biopsy needle as described in claim 3, characterized in that: The reel also includes a fixing key and a mounting groove. The front end face of the mounting boss is provided with a mounting groove. The fixing key matches the mounting groove, and the inner needle is fixedly connected to the mounting groove through the fixing key.

5. The torsion rotary biopsy needle as described in claim 1, characterized in that: The reel includes a reel body and a groove. The outer ring of the reel body has a groove, the pull line is wound in the groove, and one end of the pull line is fixedly connected to the reel body.

6. The torsion rotary biopsy needle as described in claim 1, characterized in that: The spool includes a spool body and a stop block. The stop block is provided on the rear end face of the spool body, and one end of the torsion spring is fixed to the stop block by a snap-fit ​​method.

7. The torsion rotary biopsy needle as described in claim 1, characterized in that: The end of the pull rod piston located inside the syringe is made of flexible rubber material.

8. The torsion rotary biopsy needle as described in claim 1, characterized in that: The base includes a handle and a support, the support is fixedly connected to the handle, and the torque rotation mechanism and the piston mechanism are both mounted on the support.

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