Negative pressure self-regulating electric rotary cutting biopsy needle

Abstract

The application belongs to the technical field of biopsy needles, and particularly relates to a negative pressure self-adjusting electric rotary cutting biopsy needle, which comprises a biopsy device and a negative pressure cavity. The biopsy device comprises a shell, 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 arranged in the interior of the shell. The outer tube is fixedly installed at the left end of the shell. The inner tube is arranged in the interior of the outer tube, and the cutter head is fixedly connected with the inner tube. The output end of the motor is connected with the inner tube through the gear set. The inner tube is connected with the interior of the biopsy drawer. The device solves the problem that the current electric rotary cutting biopsy needle is affected by the unstable pressure caused by the poor sealing, leakage or gas existing in the pump when the biopsy tissue is extracted by the negative pressure pump, thereby affecting the safety of the operation. In addition, the automatic adjustment of the negative pressure may cause the inaccurate pressure value, and the manual control precision is poor.

Description

Technical Field

[0001] This invention belongs to the technical field of biopsy needles, specifically relating to a negative pressure self-adjusting electric rotary biopsy needle. Background Technology

[0002] Existing biopsy needles on the market require specialized equipment to be used together. The internal cutting blade moves back and forth and depends on the hospital's power supply and negative pressure system, making it cumbersome and inflexible for doctors to use.

[0003] This solution describes an electric biopsy needle with its own power supply and negative pressure pump, which is completely independent of the hospital's power supply and negative pressure system. It is easy to operate and addresses the drawbacks of using a negative pressure pump alone to achieve negative pressure self-regulation, such as poor sealing of the negative pressure pump leading to unstable pump pressure, leakage of the pump causing unstable pressure, and the presence of gas affecting the pump's pressure performance.

[0004] This solution utilizes a negative pressure pump for negative pressure adjustment, and also allows for manual negative pressure adjustment to improve the accuracy of negative pressure adjustment. Otherwise, unstable negative pressure could easily lead to surgical risks. Summary of the Invention

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

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a negative pressure self-adjusting electric rotary biopsy needle, comprising a biopsy device and a negative pressure chamber. The biopsy device includes a housing, an outer tube, an inner tube, a blade, a motor, a gear set, and a biopsy drawer. The motor and the biopsy drawer are both disposed inside the housing. The outer tube is fixedly installed at the left end of the housing. The inner tube is disposed inside the outer tube, and the blade 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 flexible tube, a negative pressure pump, and... The device includes an end cap, an adjusting cap, 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 provided above the negative pressure chamber, and the end cap is slidably connected to the through hole. A slot is provided at the inner end of the limiting rod, and the bottom of the adjusting cap is engaged in the slot of the limiting rod. The adjusting cap and the end cap are threaded together, and both have holes in the middle. The flexible tube is inserted into the holes, and its two ends are respectively connected to the biopsy drawer and the negative pressure pump. The negative pressure pump is equipped with a pressure regulating module, which is used to automatically adjust the negative pressure according to the needs of the surgery.

[0007] The present invention further describes that the bottom of the end cap is provided with a countersunk hole, and guide blocks are fixed on both the left and right sides of the inner wall of the countersunk hole. A pressure block is slidably connected to the inner wall of the guide block, and both the inner and outer ends of the pressure block are arc-shaped. A circular spring is provided inside the countersunk hole, and the circular spring is sleeved on the outside of the hose. After the end cap is rotated, the pressure block and the outer side of the circular spring come into contact with each other.

[0008] The present invention further illustrates that the bottom end of the circular spring contactes with the bottom of the inner wall of the adjusting cover, and the bottom end of the circular spring is arc-shaped.

[0009] The present invention further describes that the end cap has two circular holes on its upper part, and a connecting rod is provided in each of the two circular holes. The connecting rod is inserted into the guide block, and a push-pull piece is fixed at the upper end and a top block is fixed at the lower end. The top block is located on one side of the circular spring piece, and its inner side is arc-shaped. The outer side of the guide block and the pressure block are both magnetic, and their magnetic poles are opposite.

[0010] The invention further illustrates that the top block has a taper and is inclined inward.

[0011] The present invention further illustrates that the surface of the connecting rod is provided with a scale, and the scale value corresponds to the number of rotations of the end cap.

[0012] The present invention further illustrates that the conical surface of the top block gradually decreases from front to back.

[0013] The present invention further illustrates that the connecting rod is slidably connected to the circular hole of the end cap.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention uses a threaded connection between the adjusting cap and the end cap, and limits the adjusting cap by a limiting rod, thereby fully stabilizing the tube and further improving the safety of the operation. It is also more convenient to replace the tube. When the tube needs to be replaced, only the end cap and the adjusting cap need to be removed to replace the tube. The operation is convenient and efficient, the overall structure is simple, and the manufacturing cost is low.

[0015] If the pressure of the negative pressure pump is unstable, the operator can rotate the end cap, which will move downwards while rotating through the threaded part of the adjusting cap. This will deform the circular spring and squeeze the hose inwards, thus reducing the inner diameter of the hose and controlling the negative pressure. This prevents the negative pressure from being unstable due to the pressure of the negative pressure pump, which could affect the safety of the operation. Moreover, it has high precision in controlling the negative pressure.

[0016] The overall structure of the negative pressure regulation system is simple, the manufacturing cost is low, and the negative pressure accuracy control is high, making it suitable for high-precision surgery. The pressure of the negative pressure pump can be manually adjusted to ensure that the pressure meets the requirements, thus making the surgery more adaptable. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

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

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

[0020] Figure 3 This is a schematic diagram of the internal structure of the end cap and adjusting cap of the present invention;

[0021] Figure 4 This is an exploded view of the end cap and adjusting cap of the present invention;

[0022] Figure 5 This is a plan view of the end cap and adjusting cap of the present invention;

[0023] Figure 6 This 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 This is a schematic diagram of the end cap of the present invention after rotation;

[0025] Figure 8 This is a schematic diagram of the plug-in connecting rod of the present invention;

[0026] Figure 9 This is a schematic diagram showing the position change of the top block after the rotating push-pull tab of the present invention;

[0027] In the diagram: 1. Shell; 2. Outer tube; 3. Inner tube; 4. Cutting head; 5. Negative pressure chamber; 51. Flexible hose; 52. Negative pressure pump; 53. End cap; 531. Guide block; 532. Pressure block; 533. Circular spring; 534. Connecting rod; 535. Push-pull plate; 536. Top block; 54. Adjusting cover; 55. Limiting rod. Detailed Implementation

[0028] The following detailed, non-limiting description of the technical solution of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-9The present invention provides a technical solution: a negative pressure self-adjusting electric rotary biopsy needle, including a biopsy device and a negative pressure chamber 5. The biopsy device includes a shell 1, an outer tube 2, an inner tube 3, a blade 4, a motor, a gear set, and a biopsy drawer.

[0030] The motor and biopsy drawer are both located inside the housing 1. The outer tube 2 is fixedly installed at the left end of the housing 1. The inner tube 3 is located inside the outer tube 2, and the blade 4 is fixedly connected to the inner tube 3. The output end of the motor is connected to the inner tube 3 through a 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.

[0031] The negative pressure pump 52 is fixedly installed on the bottom of the inner wall of the negative pressure chamber 5. A through hole is opened at the top of the negative pressure chamber 5, and the end cap 53 is slidably connected in the through hole. A slot is opened at the inner end of the limiting rod 55, and the bottom of the adjusting cover 54 is engaged in the slot of the limiting rod 55. The adjusting cover 54 and the end cap 53 are threaded together, and a hole is provided in the middle of both. The flexible tube 51 is inserted into the hole, and its two ends are respectively connected to the biopsy drawer and the negative pressure pump 52. The negative pressure pump 52 is equipped with a pressure regulating module, which is used to automatically adjust the negative pressure according to the needs of the surgery.

[0032] During a biopsy, medical staff hold the biopsy device and start it. 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 blade 4 to rotate, cutting the tissue to be biopsied. Then, the negative pressure pump 52 generates negative pressure, which is used to evacuate the inside of the biopsy drawer through the hose 51. The negative pressure inside the biopsy drawer is then used to aspirate the cut tissue through the inner tube 3. The tissue enters the biopsy drawer through the inner tube 3, ready for biopsy. The negative pressure of the negative pressure pump 52 is automatically adjusted to control the amount of negative pressure and improve the safety of the operation. The adjusting cover 54 is threadedly connected to the end cover 53, and the adjusting cover 54 is limited by the limiting rod 55, which fully stabilizes the hose 51 and further improves the safety of the operation. The replacement of the hose 51 is also convenient. When the hose 51 needs to be replaced, only the end cover 53 and the adjusting cover 54 need to be removed. The operation is convenient and efficient, the overall structure is simple, and the manufacturing cost is low.

[0033] The bottom of the end cap 53 is provided with a countersunk hole, and guide blocks 531 are fixed on both the left and right sides of the inner wall of the countersunk hole. A pressure block 532 is slidably connected to the inner wall of the guide block 531, and both the inner and outer ends of the pressure block 532 are arc-shaped.

[0034] A circular spring piece 533 is provided inside the countersunk hole, and the circular spring piece 533 is sleeved on the outside of the flexible tube 51; after the end cap 53 is rotated, the pressure block 532 comes into contact with the outside of the circular spring piece 533.

[0035] Example 1:

[0036] If the pressure of the negative pressure pump 52 is unstable, the operator can rotate the end cover 53, causing it to move downwards while rotating through the threaded portion of the adjusting cover 54. Figure 7 As shown, the pressure block 532 and the circular spring 533 come into contact with each other and squeeze the circular spring 533. The circular spring 533 deforms and squeezes the tubing 51 inward, deforming the tubing 51. This reduces the inner diameter of the tubing 51, controls the negative pressure, and avoids the negative pressure instability caused by the unstable pressure of the negative pressure pump 52, which affects the safety of the operation. It also has high precision in controlling the negative pressure.

[0037] The bottom end of the circular spring piece 533 is in contact with the bottom of the inner wall of the adjusting cover 54, and the bottom end of the circular spring piece 533 is arc-shaped.

[0038] Example 2:

[0039] The negative pressure is significantly reduced, and the end cap 53 moves downwards significantly. The upper end of the circular spring piece 533 contacts the upper inner wall of the end cap 53, while the lower end contacts the bottom of the adjusting cover 54. The two press against each other, and the circular spring piece 533 is first deformed by the inward push of the pressure block 532. Then, by pressing the upper and lower ends of the circular spring piece 533, the deformation strength of the circular spring piece 533 is further improved, thereby increasing the squeezing force on the hose 51, significantly reducing the negative pressure, and improving the accuracy of negative pressure adjustment. Furthermore, the pressure block 532 applies a force to the outer side of the circular spring piece 533, while the upper and lower ends of the circular spring piece 533 are squeezed outwards to apply a reaction force to the pressure block 532, thereby maintaining the stability of the force, avoiding a large pressure adjustment range during negative pressure adjustment, and improving adjustment efficiency.

[0040] Two round holes are provided on the top of the end cap 53, and a connecting rod 534 is provided in each of the two round holes. The connecting rod 534 is inserted into the guide block 531, and a push-pull piece 535 is fixed at the upper end and a top block 536 is fixed at the lower end.

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

[0042] The outer side of the conductor block 531 and the pressure block 532 are both magnetic, and their magnetic poles are opposite.

[0043] When the end cap 53 moves downward, it causes the pressure block 532 and the guide block 531 to move downward until the outer end of the pressure block 532 contacts the inner side of the top block 536. Figure 7 As shown, the top block 536 presses the pressure block 532 inward, causing it to slide inward through the guide block 531, thereby increasing the pressure on the circular spring piece 533. This prevents the pressure on the hose 51 from decreasing as the circular spring piece 533 deforms and expands outward, thus preventing any impact on the degree of deformation of the hose 51. This allows for precise control of the inner diameter of the hose 51 and makes negative pressure adjustment more convenient.

[0044] The top block 536 is tapered and tilted inward;

[0045] When the end cap 53 rotates, in order to accurately control the amount of negative pressure, the pressure applied by the tapered top block 536 to the pressure block 532 gradually increases. The more the pressure block 532 moves downward, the greater the squeezing intensity of the top block 536, thereby increasing the squeezing force on the hose 51 through the circular spring piece 533, and the effect of negative pressure regulation is significantly improved, resulting in better negative pressure regulation.

[0046] The surface of the connecting rod 534 is provided with a scale, and the scale value corresponds to the number of rotations of the end cap 53;

[0047] Example 3:

[0048] Predicting the required negative pressure for the surgery, the pressure block 532 and the top block 536 come into contact. The operator then pulls the connecting rod 534 upwards via the push-pull tab 535, which in turn moves the top block 536 upwards. The tapered part of the top block 536 gradually squeezes the pressure block 532. When the required negative pressure is reached, the operator rotates the end cap 53 a corresponding number of times according to the scale value on the pulled-out connecting rod 534, while simultaneously resetting the push-pull tab 535. This high efficiency in negative pressure adjustment improves the efficiency of the surgery.

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

[0050] Example 4:

[0051] After the initial adjustment of the negative pressure, fine-tuning is performed. At this point, the operator can rotate the push-pull plate 535, which, via the connecting rod 534, causes the top block 536 to rotate. After rotation, the taper of the contact surface with the pressure block 532 changes, such as... Figure 9 As shown, the accuracy control of the inner diameter variation of hose 51 is higher.

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

[0053] Example 5:

[0054] When a slight blockage occurs between the inner tube 3 and the biopsy drawer, the operator only needs to repeatedly push and pull the connecting rod 534 up and down through the push-pull plate 535, thereby continuously reducing the inner diameter of the hose 51 and then resetting it. The negative pressure goes from large to small and then back to large. After repeating this several times, the slight blockage is sucked into the biopsy drawer through the frequent changes in negative pressure, which makes cleaning easier.

[0055] The overall structure of the negative pressure regulation system is simple, the manufacturing cost is low, and the negative pressure accuracy control is high, making it suitable for high-precision surgery. Whether the pressure of the negative pressure pump 52 meets the requirements can be manually adjusted, making it more adaptable to surgery.

[0056] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. 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, and these 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 negative pressure self-adjusting electric rotary 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 blade (4), a motor, a gear set, and a biopsy drawer; The motor and biopsy drawer are both located inside the housing (1). The outer tube (2) is fixedly installed at the left end of the housing (1). The inner tube (3) is located inside the outer tube (2), and the blade (4) is fixedly connected to the inner tube (3). The output end of the motor is connected to the inner tube (3) through a 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). The negative pressure pump (52) is fixedly installed on 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 slot is opened at the inner end of the limiting rod (55), and the bottom of the adjusting cover (54) is engaged in the slot of the limiting rod (55). The adjusting cover (54) and the end cap (53) are threaded together, and a hole is provided in the middle of both. The flexible tube (51) is inserted into the hole, and both ends are connected to the biopsy drawer and the negative pressure pump (52) respectively. A pressure regulating module is provided inside the negative pressure pump (52). The pressure regulating module is used to automatically adjust the negative pressure according to the needs of the surgery. A countersunk hole 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 countersunk hole. A pressure block (532) is slidably connected to the inner wall of the guide block (531). The inner and outer ends of the pressure block (532) are arc-shaped. The countersunk hole is provided with a circular spring piece (533), which is sleeved on the outside of the hose (51). After the end cap (53) is rotated, the pressure block (532) and the outside of the circular spring piece (533) come into contact with each other. The bottom end of the circular spring piece (533) comes into contact with the bottom of the inner wall of the adjusting cover (54), and the bottom end of the circular spring piece (533) is arc-shaped. Two circular holes are opened on the top of the end cap (53), and a connecting rod (534) is provided in each of the two circular holes. The connecting rod (534) is inserted into the guide block (531), and a push-pull piece (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 spring piece (533), and its inner side is arc-shaped; The outer side of the guide block (531) and the pressure block (532) are both magnetic, and their magnetic poles are opposite. The top block (536) is tapered and tilted inward. The surface of the connecting rod (534) is provided with a scale, and the scale value corresponds to the number of rotations of the end cap (53). The tapered surface of the top block (536) gradually decreases from front to back. The connecting rod (534) is slidably connected to the round hole of the end cap (53).

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