Negative pressure self-adjusting type electric rotary cutting biopsy needle

Abstract

The invention belongs to the technical field of biopsy needles, and particularly relates to a negative pressure self-adjusting type electric rotary cutting biopsy needle which comprises a biopsy device and a negative pressure cavity, and the biopsy device comprises a shell, an outer tube, an inner tube, a tool bit, a motor, a gear set and a biopsy drawer; the motor and the biopsy drawer are arranged in the shell, the outer tube is fixedly installed at the left end of the shell, the inner tube is arranged in the outer tube, the tool bit is fixedly connected with the inner tube, the output end of the motor is connected with the inner tube through the gear set, and the inner tube is connected with the interior of the biopsy drawer. The device solves the problems that when a current electric rotary cutting biopsy needle extracts biopsy tissue through a negative pressure pump, due to the fact that the negative pressure pump is poor in sealing and leaks or gas exists in the pump, the pressure is unstable, the operation safety is affected, and due to the fact that automatic negative pressure adjustment is adopted, the pressure numerical value is inaccurate, and the operation safety is affected. And the precision is poor relative to manual control.

Description

Technical Field

[0001] The present invention belongs to the technical field of biopsy needles, and particularly relates to a negative pressure self-adjusting electric rotary cutting biopsy needle. Background Art

[0002] The existing rotary cutting biopsy needles on the market need to be used in combination with special equipment. The inner rotary cutter moves back and forth, relying on the hospital's power supply and negative pressure system, making it cumbersome and inflexible for doctors to use.

[0003] The electric biopsy needle described in this solution is equipped with its own power supply and negative pressure pump, which is completely independent of the hospital's power supply and negative pressure system, and is convenient to operate. However, for the problems that the poor sealing of the negative pressure pump leads to unstable pump pressure, the leakage of the pump leads to unstable pressure, and the presence of gas affects the pressure performance of the pump, it is obvious that there are drawbacks in achieving negative pressure self-regulation solely through the negative pressure pump;

[0004] After the negative pressure of the negative pressure pump is adjusted in this solution, manual negative pressure adjustment can also be carried out to improve the negative pressure adjustment accuracy. Otherwise, it is extremely easy to cause the phenomenon that the operation is risky due to unstable negative pressure. Summary of the Invention

[0005] The purpose of the present invention is to provide a negative pressure self-adjusting electric rotary cutting biopsy needle to solve the problems raised in the above background art.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A negative pressure self-adjusting electric rotary cutting biopsy needle, comprising a biopsy device and a negative pressure chamber. The biopsy device includes a housing, an outer tube, an inner tube, a cutter head, a motor, a gear set, and a biopsy drawer; the motor and the biopsy drawer are both arranged inside the housing, the outer tube is fixedly installed at the left end of the housing, the inner tube is arranged inside the outer tube, and the cutter head is fixedly connected to the inner tube. The output end of the motor is connected to the inner tube through the gear set, the inner tube is connected to the inside of the biopsy drawer. The negative pressure chamber includes a hose, a negative pressure pump, an end cover, an adjustment cover, and a limiting rod; the negative pressure pump is fixedly installed at the bottom of the inner wall of the negative pressure chamber, a through hole is opened above the negative pressure chamber, and the end cover is slidably connected in the through hole. A clamping groove is opened at the inner end of the limiting rod, and the bottom of the adjustment cover is clamped in the clamping groove of the limiting rod. The adjustment cover is threadedly connected to the end cover, and holes are provided in the middle of both of them. The hose passes through the holes and is respectively connected to the biopsy drawer and the negative pressure pump at both ends. A pressure adjustment module is arranged inside the negative pressure pump, and the pressure adjustment module is used to automatically adjust the negative pressure magnitude according to the surgical needs.

[0007] The present invention is further described as follows. A counterbore is provided at the bottom of the end cap, and guide blocks are fixed on both the left and right sides of the inner wall of the counterbore. A pressing block is slidably connected to the inner wall of the guide block, and both the inner and outer ends of the pressing block are arc-shaped. A circular elastic sheet is arranged inside the counterbore, and the circular elastic sheet is sleeved outside the hose. After the end cap rotates, the pressing block comes into contact with the outer side of the circular elastic sheet.

[0008] The present invention is further described as follows. The bottom end of the circular elastic sheet is in contact with the bottom of the inner wall of the adjusting cap, and the bottom end of the circular elastic sheet is arc-shaped.

[0009] The present invention is further described as follows. Two round holes are provided above the end cap, and connecting rods are arranged in both round holes. The connecting rods penetrate through the guide blocks, with a push-pull sheet fixed to the upper end and a top block fixed to the lower end. The top block is located on one side of the circular elastic sheet, and the inner side is arc-shaped. Both the outer side of the guide block and the pressing block have magnetism, and the magnetic poles are opposite.

[0010] The present invention is further described as follows. The top block has a taper and is inclined inward.

[0011] The present invention is further described as follows. A scale is provided on the surface of the connecting rod, and the scale value corresponds to the number of rotation turns of the end cap.

[0012] The present invention is further described as follows. The tapered surface of the top block gradually decreases from front to back.

[0013] The present invention is further described as follows. The connecting rod is slidably connected to the round hole of the end cap.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: In the present invention, the adjusting cap and the end cap are connected by threads, and the adjusting cap is limited by the limiting rod, thereby fully stabilizing the hose, further improving the surgical safety, and the replacement of the hose is also relatively convenient. When the hose needs to be replaced, only the end cap and the adjusting cap need to be taken out, and then the hose can be replaced. The operation is convenient and efficient, the overall structure is simple, and the manufacturing cost is low.

[0015] When the pressure of the negative pressure pump is unstable, the operator can rotate the end cap, so that it moves downward while rotating through the threaded part of the adjusting cap. Through the deformation of the circular elastic sheet, the hose is squeezed inward, and the hose is squeezed and deformed, so that the inner diameter of the hose becomes smaller, controlling the negative pressure, avoiding the influence of unstable negative pressure caused by unstable pressure of the negative pressure pump on surgical safety, and the control precision of the negative pressure is high.

[0016] For the overall negative pressure adjustment, the structure is simple, the manufacturing cost is low, the negative pressure precision control is high, it is suitable for high-precision surgeries, and whether the pressure of the negative pressure pump meets the requirements can be manually adjusted, and the surgical adaptability is higher. Description of the Drawings

[0017] The accompanying drawings are used to provide a further understanding of the present invention and form a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a schematic diagram of the internal structure of the negative pressure chamber of the present invention;

[0020] Figure 3 is a schematic diagram of the internal structure of the end cover and the adjustment cover of the present invention;

[0021] Figure 4 is an exploded view of the end cover and the adjustment cover of the present invention;

[0022] Figure 5 is a plan view of the end cover and the adjustment cover of the present invention;

[0023] Figure 6 is a schematic diagram of the internal structure of the guide block and the position of the connecting rod of the present invention;

[0024] Figure 7 is a schematic diagram of the end cover of the present invention after rotation;

[0025] Figure 8 is a schematic diagram of inserting and pulling out the connecting rod of the present invention;

[0026] Figure 9 is a schematic diagram of the position change of the top block after rotating and pushing and pulling the push-pull piece of the present invention;

[0027] In the figures: 1. housing; 2. outer tube; 3. inner tube; 4. cutter head; 5. negative pressure chamber; 51. hose; 52. negative pressure pump; 53. end cover; 531. guide block; 532. pressure block; 533. circular elastic sheet; 534. connecting rod; 535. push-pull piece; 536. top block; 54. adjustment cover; 55. limit rod. Detailed Description of the Embodiments

[0028] The following further non-limiting detailed description of the technical solution of the present invention is provided in conjunction with the preferred embodiments and their accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0029] Please refer to Figures 1-9, the present invention provides a technical solution: a negative pressure self-adjusting electric rotary cutting biopsy needle, which includes a biopsy device and a negative pressure chamber 5. The biopsy device includes a housing 1, an outer tube 2, an inner tube 3, a cutter head 4, a motor, a gear set, and a biopsy drawer;

[0030] The motor and the biopsy drawer are both arranged inside the housing 1. The outer tube 2 is fixedly installed at the left end of the housing 1. The inner tube 3 is arranged inside the outer tube 2, and the cutter head 4 is fixedly connected to the inner tube 3. The output end of the motor is connected to the inner tube 3 through the gear set. The inner tube 3 is connected to the inside of the biopsy drawer. The negative pressure chamber 5 includes a hose 51, a negative pressure pump 52, an end cap 53, an adjustment cap 54, and a limiting rod 55;

[0031] The negative pressure pump 52 is fixedly installed at the bottom of the inner wall of the negative pressure chamber 5. A through hole is opened above the negative pressure chamber 5, and the end cap 53 is slidably connected in the through hole. A card slot is opened at the inner end of the limiting rod 55, and the bottom of the adjustment cap 54 is clamped in the card slot of the limiting rod 55. The adjustment cap 54 is threadedly connected to the end cap 53, and holes are provided between the two. The hose 51 is inserted through the holes and is respectively connected to the biopsy drawer and the negative pressure pump 52 at both ends. A pressure adjustment module is arranged inside the negative pressure pump 52, and the pressure adjustment module is used to automatically adjust the negative pressure size according to the surgical needs;

[0032] During the biopsy, the medical staff holds the biopsy device and starts the biopsy device. The negative pressure pump 52 and the motor run simultaneously. The motor drives the inner tube 3 to rotate through the gear set, and the inner tube 3 drives the cutter head 4 to rotate to cut the tissue to be biopsied. Then, the negative pressure pump 52 generates negative pressure, and the inside of the biopsy drawer is evacuated through the hose 51. The negative pressure generated inside the biopsy drawer sucks the cut tissue through the inner tube 3, and the tissue enters the biopsy drawer through the inner tube 3 for biopsy use. Moreover, the negative pressure of the negative pressure pump 52 is automatically adjusted to control the negative pressure size and improve the surgical safety. By the threaded connection between the adjustment cap 54 and the end cap 53, and the adjustment cap 54 is limited by the limiting rod 55, the hose 51 is fully stabilized, further improving the surgical safety, and it is also relatively convenient to replace the hose 51. When the hose 51 needs to be replaced, only the end cap 53 and the adjustment cap 54 need to be taken out to replace the hose. The operation is convenient and efficient. The overall structure is simple and the manufacturing cost is low.

[0033] A counterbore is opened at the bottom of the end cap 53, and guide blocks 531 are fixed on both the left and right sides of the inner wall of the counterbore. A pressing block 532 is slidably connected to the inner wall of the guide block 531, and both the inner and outer ends of the pressing block 532 are arc-shaped;

[0034] A circular elastic sheet 533 is arranged inside the counterbore, and the circular elastic sheet 533 is sleeved on the outside of the hose 51; after the end cap 53 rotates, the pressing block 532 contacts the outside of the circular elastic sheet 533;

[0035] Embodiment 1:

[0036] The pressure of the negative pressure pump 52 is unstable. At this time, the operator rotates the end cover 53, and it moves downward while rotating through the threaded part of the adjusting cover 54. As Figure 7 shown, until the pressing block 532 contacts the circular elastic piece 533 and squeezes the circular elastic piece 533. The circular elastic piece 533 deforms and squeezes the hose 51 inward, deforming the hose 51, so that the inner diameter of the hose 51 becomes smaller, controlling the negative pressure, avoiding the influence of unstable negative pressure caused by the unstable pressure of the negative pressure pump 52 on the surgical safety, and having a high control accuracy for the negative pressure.

[0037] The bottom end of the circular elastic piece 533 contacts the bottom of the inner wall of the adjusting cover 54, and the bottom end of the circular elastic piece 533 is arc-shaped;

[0038] Embodiment 2:

[0039] Greatly reduce the negative pressure. The end cover 53 moves downward greatly. The upper end of the circular elastic piece 533 contacts the upper part of the inner wall of the end cover 53, and at the same time, the lower end contacts the bottom of the adjusting cover 54. The two squeeze the circular elastic piece 533 together. The circular elastic piece 533 is first deformed by the inward push of the pressing block 532, and then the upper and lower ends of the circular elastic piece 533 are squeezed, so as to further increase the deformation strength of the circular elastic piece 533, thereby increasing the squeezing force on the hose 51, greatly reducing the negative pressure, having a higher negative pressure adjustment accuracy, and applying a force to the outside of the circular elastic piece 533 through the pressing block 532. At the same time, the upper and lower ends of the circular elastic piece 533 are squeezed and apply a reaction force to the outside of the pressing block 532, so as to maintain the stability of the force, avoid a large pressure adjustment span during negative pressure adjustment, and improve the adjustment efficiency.

[0040] Two round holes are provided above the end cover 53, and connecting rods 534 are arranged in both round holes. The connecting rods 534 are inserted into the guide block 531, with a push-pull piece 535 fixed at the upper end and a top block 536 fixed at the lower end;

[0041] The top block 536 is located on one side of the circular elastic piece 533, and the inner side is arc-shaped;

[0042] The outside of the guide block 531 and the pressing block 532 both have magnetism, and the magnetic poles are opposite;

[0043] When the end cover 53 moves downward, it drives the pressing block 532 and the guide block 531 to move downward until the outer end of the pressing block 532 contacts the inner side of the top block 536. As Figure 7 shown, the top block 536 squeezes the pressing block 532 inward, making it slide inward through the guide block 531, so as to increase the squeezing force on the circular elastic piece 533, avoid the reduction of the force on the hose 51 when the circular elastic piece 533 deforms and expands outward, thereby preventing the influence on the deformation degree of the hose 51, accurately controlling the inner diameter of the hose 51, and making the negative pressure adjustment more convenient.

[0044] The top block 536 has a taper and is inclined inwardly;

[0045] When the end cap 53 rotates, to precisely control the magnitude of the negative pressure, the pressure exerted by the tapered top block 536 on the pressure block 532 is gradually increased. The lower the pressure block 532 moves, the greater the intensity of the extrusion by the top block 536. Thus, the squeezing force on the hose 51 through the circular elastic piece 533 becomes greater and greater, and the effect of negative pressure regulation is significantly improved, and the effect of negative pressure regulation is better.

[0046] The surface of the connecting rod 534 is provided with scales, and the scale values correspond to the number of turns of the end cap 53;

[0047] Example Three:

[0048] Predict the magnitude of the negative pressure required for the operation. At this time, after the pressure block 532 and the top block 536 come into contact with each other, the operator pulls the connecting rod 534 upward through the push-pull piece 535, thereby driving the top block 536 to move upward. The tapered part of the top block 536 gradually squeezes the pressure block 532. After that, when the required negative pressure magnitude is adjusted, according to the scale value on the pulled-out connecting rod 534, the corresponding number of turns of the end cap 53 is rotated, and at the same time, the push-pull piece 535 is reset. The efficiency of negative pressure regulation is high, and the efficiency of the operation is improved.

[0049] The tapered surface of the top block 536 gradually decreases from front to back;

[0050] Example Four:

[0051] After the negative pressure magnitude is initially adjusted, for fine adjustment, at this time, the operator can rotate the push-pull piece 535, so that it drives the top block 536 to rotate through the connecting rod 534. After its rotation, the taper of the contact surface with the pressure block 532 changes, as Figure 9 shown, and the precision control of the inner diameter change of the hose 51 is higher.

[0052] The connecting rod 534 is slidably connected to the circular hole of the end cap 53;

[0053] Example Five:

[0054] When there is a slight blockage between the inner tube 3 and the biopsy drawer, at this time, the operator only needs to continuously insert and pull out the connecting rod 534 up and down through the push-pull piece 535, so that the inner diameter of the hose 51 is continuously reduced and then reset, and the negative pressure changes from large to small and then to large. After repeating several times, through the frequent change of the negative pressure, the slightly blocked part is sucked into the biopsy drawer, which is more convenient for cleaning;

[0055] For the overall negative pressure regulation, the structure is simple, the manufacturing cost is low, and the negative pressure precision control is high, which is suitable for high-precision surgeries. Whether the pressure of the negative pressure pump 52 meets the requirements can be manually adjusted, and the surgical adaptability is higher.

[0056] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention.

[0057] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A negative pressure self-adjusting electric rotary cutting biopsy needle, comprising a biopsy device and a negative pressure chamber (5), characterized in that: The biopsy device includes a housing (1), an outer tube (2), an inner tube (3), a cutter head (4), a motor, a gear set, and a biopsy drawer; The motor and the biopsy drawer are both arranged inside the housing (1). The outer tube (2) is fixedly installed at the left end of the housing (1). The inner tube (3) is arranged inside the outer tube (2), and the cutter head (4) is fixedly connected to the inner tube (3). The output end of the motor is connected to the inner tube (3) through the gear set. The inner tube (3) is connected to the inside of the biopsy drawer. The negative pressure chamber (5) includes a hose (51), a negative pressure pump (52), an end cap (53), an adjustment cap (54), and a limit rod (55); The negative pressure pump (52) is fixedly installed at the bottom of the inner wall of the negative pressure chamber (5). A through hole is opened above the negative pressure chamber (5), and the end cap (53) is slidably connected in the through hole. A card slot is opened at the inner end of the limit rod (55), and the bottom of the adjustment cap (54) is clamped in the card slot of the limit rod (55). The adjustment cap (54) is threadedly connected to the end cap (53), and holes are provided in the middle of both of them. The hose (51) is inserted through the holes and is connected to the biopsy drawer and the negative pressure pump (52) at both ends respectively. A pressure adjustment module is arranged inside the negative pressure pump (52), and the pressure adjustment module is used to automatically adjust the negative pressure magnitude according to the surgical needs.

2. The negative-pressure self-adjusting electric rotary cutting biopsy needle according to claim 1, characterized in that: A counterbore is opened at the bottom of the end cap (53), and guide blocks (531) are fixedly arranged on both the left and right sides of the inner wall of the counterbore. A pressing block (532) is slidably connected to the inner wall of the guide block (531), and both the inner and outer ends of the pressing block (532) are arc-shaped; A circular elastic sheet (533) is arranged inside the counterbore, and the circular elastic sheet (533) is sleeved outside the hose (51); after the end cap (53) rotates, the pressing block (532) contacts the outside of the circular elastic sheet (533).

3. The negative pressure self-adjusting electric rotary cutting biopsy needle according to claim 2, characterized in that: The bottom end of the circular elastic sheet (533) contacts the bottom of the inner wall of the adjustment cap (54), and the bottom end of the circular elastic sheet (533) is arc-shaped.

4. The negative-pressure self-adjusting electric rotary cutting biopsy needle according to claim 3, characterized in that: Two round holes are opened above the end cap (53), and connecting rods (534) are arranged in both of the two round holes. The connecting rods (534) are inserted through the guide blocks (531), and a push-pull sheet (535) is fixed at the upper end and a top block (536) is fixed at the lower end; The top block (536) is located on one side of the circular elastic sheet (533), and the inner side is arc-shaped; Both the outside of the guide block (531) and the pressing block (532) have magnetism, and the magnetic poles are opposite.

5. The negative pressure self-adjusting electric rotary cutting biopsy needle according to claim 4, wherein: The top block (536) has a taper and is inclined inward.

6. A negative pressure self-adjusting electric rotary cutting biopsy needle according to claim 5, characterized in that: A scale is arranged on the surface of the connecting rod (534), and the scale value corresponds to the number of rotation turns of the end cap (53).

7. The negative pressure self-adjusting electric rotary cutting biopsy needle according to claim 6, characterized in that: The tapered surface of the top block (536) gradually decreases from front to back.

8. The negative pressure self-adjusting electric rotary cutting biopsy needle according to claim 7, characterized in that: The connecting rod (534) is slidably connected in the round hole of the end cap (53).

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