Biopsy needle inner and outer knife matching structure

Abstract

The utility model relates to a matching structure of an inner knife and an outer knife of a biopsy needle. The matching structure comprises an inner knife tube and an outer needle tube sleeved outside the inner knife tube, an expansion pipe section capable of containing more collected tissues is arranged on the front side of the inner knife pipe, and the lower peripheral side pipe wall, corresponding to the pipe section, of the tissue suction inlet expands outwards to form an expansion groove structure; a fluid conveying channel is formed between the expansion groove structure and the outer wall of the expansion pipe section; the rear section of the inner knife tube is in clearance fit with the rear section of the outer needle tube to form an annular conveying cavity communicated with the fluid conveying channel. According to the utility model, the expansion tube section of the inner knife tube is matched with the expansion groove structure of the outer needle tube, so that the sample collection space of the inner knife tube is maximized, and the sampling effect is improved; while the outer wall surface of the expansion tube section is tightly attached to the inner wall surface of the outer needle tube, the gap is minimized, meanwhile, the expansion groove structure of the outer needle tube can be communicated with the annular conveying cavity, fluid communication is ensured, and cutter blockage caused by the fact that fluid cannot be communicated after tissue cutting is completed is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical apparatus and instruments, especially to a biopsy needle inner-outer knife cooperation structure. BACKGROUND

[0002] The biopsy device is suitable for clinical biopsy sampling. After the biopsy needle punctures the human body lesion part, the target tissue is sucked into the biopsy needle outer-needle knife groove through the negative pressure generated by the biopsy equipment matched therewith, and the tissue adsorbed into the knife groove is cut off through the cutting movement of the inner knife. In the prior art, the biopsy needle inner knife and the outer needle have uniform pipe diameters, and the fluid passage is realized through the cooperation gap between the inner knife and the outer needle as a fluid cavity.

[0003] Defects and reasons of the prior art:

[0004] In the prior art, the biopsy needle inner knife and the outer needle have uniform pipe diameters, and the fluid passage is realized through the cooperation gap between the inner knife and the outer needle as a fluid cavity. However, the structure of the biopsy needle has the following two problems:

[0005] On the one hand, when the sampling amount of the inner knife pipe diameter is increased, the inner knife pipe diameter needs to be increased, but this will make the gap between the inner knife pipe and the outer needle pipe smaller, reduce the fluid that can pass through the inner knife pipe and the outer needle pipe, cause the biopsy sample to be blocked in the inner knife pipe, and ultimately lead to the problem that the tissue cannot be transferred to the object basket;

[0006] On the other hand, when the gap between the inner knife pipe and the outer needle pipe is increased to solve the above problem, the too large gap will cause a series of problems such as shaking, abnormal noise and tissue being rolled into the gap between the inner knife and the outer needle during the operation of the biopsy needle, and ultimately cause the problem of motor blockage. CONTENT OF THE UTILITY MODEL

[0007] The utility model aims at providing a biopsy needle inner-outer knife cooperation structure which can maximize the inner knife sample space during sampling, make the puncture needle run more stably, and solve the problems of abnormal noise and tissue being rolled into the gap between the inner knife and the outer needle.

[0008] The utility model realizes the following technical scheme: a biopsy needle inner-outer knife cooperation structure, comprising an inner knife pipe and an outer needle pipe sleeved outside the inner knife pipe; the front end of the outer needle pipe is provided with a needle tip, the outer needle pipe is provided with a tissue suction inlet on the circumferential side pipe wall, and the tissue suction inlet is arranged on the pipe section close to the needle tip of the outer needle pipe;

[0009] The front side of the inner knife pipe is provided with an expanded pipe section capable of containing more collected tissue, the outer wall surface of the expanded pipe section is tightly matched with the inner wall surface of the outer needle pipe, the lower circumferential side pipe wall of the tissue suction inlet corresponding pipe section is outwardly expanded to form an expanded groove structure; a fluid conveying channel is formed between the expanded groove structure and the outer wall of the expanded pipe section;

[0010] The rear section of the inner knife tube and the rear section of the outer needle tube are fitted together with a gap to form an annular delivery cavity that is interconnected with the fluid delivery channel.

[0011] Compared with previous technologies, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model maximizes the sample collection space of the inner knife tube by combining the expansion tube section of the inner knife tube with the expansion groove structure of the outer needle tube, thereby improving the sampling effect;

[0013] While minimizing the gap by closely adhering to the outer wall of the expansion tube section and the inner wall of the outer needle tube, the expansion groove structure of the outer needle tube can also connect to the annular delivery chamber to ensure fluid continuity and avoid clogging caused by fluid blockage after tissue cutting.

[0014] 2. The outer wall of the expansion tube section is in close contact with the wall of the outer needle tube, which can improve the stability of the cutting process and reduce operating noise. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal knife tube structure;

[0016] Figure 2 This is a schematic diagram of the outer needle tube;

[0017] Figure 3 This is a schematic diagram of the structure after the inner knife tube and the outer needle tube are connected;

[0018] Figure 4 A schematic diagram of the structure of the outer needle tube tip, the annular groove, and the annular blade of the inner blade tube that connects with it;

[0019] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0020] Figure 6 for Figure 3 A schematic diagram of the cross-sectional structure at the upper BB section.

[0021] Labeling explanation: 1 Inner blade tube, 11 Expansion tube section, 12 Ring-shaped blade edge, 13 Strip-shaped through hole, 2 Outer needle tube, 21 Needle tip, 22 Tissue aspiration port, 23 Expansion groove structure, 24 Ring-shaped groove, 3 Ring-shaped delivery cavity, 31 Fluid delivery channel. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description:

[0023] like Figures 1 to 6As shown, a biopsy needle inner and outer blade combination structure includes an inner blade tube 1 and an outer needle tube 2 sleeved outside the inner blade tube 1; the front end of the outer needle tube 2 is provided with a needle tip 21, and a tissue aspiration port 22 is opened on the circumferential tube wall of the outer needle tube 2, and the tissue aspiration port 22 is located in the tube section of the outer needle tube 2 near the needle tip 21.

[0024] The inner tube 1 is provided with an expansion tube section 11 on the front side, which can accommodate more collected tissue. The outer wall of the expansion tube section 11 is in close contact with the inner wall of the outer needle tube 2. The lower circumferential side wall of the tissue suction port 22 expands outward to form an expansion groove structure 23. A fluid delivery channel 31 is formed between the expansion groove structure 23 and the outer wall of the expansion tube section 11.

[0025] The rear section of the inner knife tube 1 and the rear section of the outer needle tube 2 are fitted together with a gap to form an annular delivery cavity 3 that is interconnected with the fluid delivery channel 31.

[0026] It should be noted that, compared to existing technologies, the purpose of this invention is to provide a biopsy needle inner and outer blade mating structure. This structure involves machining a groove at the slotted position of the outer needle tube and expanding the front end of the inner blade, ensuring fluid flow, preventing clogging, and minimizing the mating gap between the inner and outer blades. This maximizes the sample space within the inner blade during sampling, resulting in smoother needle movement and resolving issues such as abnormal noise and tissue rolling into the gap between the inner and outer blades.

[0027] Furthermore, the rear end of the needle tip 21 is provided with an annular groove 24, and the front end of the expansion tube section 11 is provided with an annular blade 12 that cooperates with the annular groove 24.

[0028] Furthermore, the expansion tube section 11 is provided with several strip-shaped through holes 13.

[0029] It should be noted that the annular blade 12 is a conventional technique for the inner blade tube. In this invention, an expansion tube section 11 is provided on the front side of the inner blade tube, so the annular blade 12 is located at the front end of the expansion tube section 11.

[0030] In use, the inner knife tube 1 and the outer needle tube 2 are assembled. The tissue aspiration port 22 on the outer needle tube 2 is closed by the expansion tube section 11 at the front end of the inner knife tube 1. The outer needle tube 2 is inserted into the lesion site. The inner knife tube 1 is pulled back, and the sample tissue is drawn into the tissue aspiration port 22 by the negative pressure. The inner knife tube 1 rotates forward to cut, and the sample tissue is cut off by the cooperation of the annular blade 12 and the annular groove 24. The fluid enters the fluid delivery channel 31 through the annular delivery chamber 3, and then enters the inner knife tube 1 through the strip-shaped through hole 13 and the front end of the expansion tube section 11. The cut sample tissue is collected through the collection basket at the rear end of the inner knife tube 1.

[0031] Although this utility model has been illustrated and described using specific embodiments and alternative methods, it should be understood that various changes and modifications are permitted as long as they do not depart from the spirit and scope of this utility model. Therefore, it should be understood that this utility model is not limited in any sense except by the appended claims and their equivalents.

Claims

1. A biopsy needle inner-outer knife matching structure, comprising an inner knife tube (1) and an outer needle tube (2) sleeved outside the inner knife tube (1); the front end of the outer needle tube (2) is provided with a needle tip (21), the outer needle tube (2) is provided with a tissue suction port (22) on the circumferential side wall, and the tissue suction port (22) is arranged on the tube section of the outer needle tube (2) close to the needle tip (21); Characterized in that: The front side of the inner knife tube (1) is provided with an expanded tube section (11) capable of containing more collected tissues, the outer wall surface of the expanded tube section (11) is tightly matched with the inner wall surface of the outer needle tube (2), the lower circumferential wall of the corresponding tube section of the tissue suction port (22) is outwardly expanded to form an expanded groove structure (23); the expanded groove structure (23) and the outer wall of the expanded tube section (11) form a fluid conveying channel (31); The rear section of the inner knife tube (1) and the rear section of the outer needle tube (2) are gap matched to form an annular conveying cavity (3) in communication with the fluid conveying channel (31).

2. The inner-outer knife engagement structure of a biopsy needle according to claim 1, wherein: The rear end of the needle tip (21) is provided with an annular groove (24), and the front end of the expanded tube section (11) is provided with an annular knife edge (12) matched with the annular groove (24).

3. The inner-outer knife engagement structure of a biopsy needle according to claim 2, wherein: The expanded tube section (11) is provided with a plurality of strip-shaped through holes (13).

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