Biopsy needle-knife tube assembly and biopsy needle

Abstract

The utility model relates to medical apparatus and instruments technical field especially, more particularly to a kind of biopsy needle-knife tube assembly and biopsy needle, including outer knife tube and inner knife tube, and sampling window is provided on outer knife tube;Inner knife tube can be movably sleeved in outer knife tube along the axial direction of outer knife tube;Wherein, the inner wall of outer knife tube is provided with the air passage groove extending along the axial direction of outer knife tube, and the bottom wall of air passage groove and the outer wall of inner knife tube have first gap, and the inner wall of outer knife tube and the outer wall of inner knife tube have second gap, and first gap and second gap are communicated and form airflow passage. By setting air passage groove, the height of the gap between outer knife tube and inner knife tube along radial direction can be increased, the gas flow between inner knife tube and outer knife tube is improved, so that the cut tissue can be smoothly pushed into the collection box of biopsy needle tail. At the same time, the part of outer knife tube inner wall without setting air passage groove can keep the support to inner knife tube, so that inner knife tube moves stably in outer knife tube.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a biopsy needle tube assembly and a biopsy needle. Background Technology

[0002] In existing biopsy needle structures that utilize negative pressure aspiration for sampling, there are two blades: an outer blade and an inner blade, with the inner blade housed within the outer blade. Tissue is sampled by cutting through the blade at the tip of the inner blade. The outer blade has a tissue sampling groove at its tip, and a collection box is connected to the tail of the inner blade. An external unit generates negative pressure within the collection box, which draws tissue into the sampling groove through the inner hole of the inner blade. The inner blade then rotates forward to cut and place the tissue within it. After cutting, external airflow enters the inner hole of the inner blade through the gap between the inner and outer blades, pushing the tissue into the tissue collection box at the tail of the inner blade.

[0003] During this process, because the inner blade rotates forward to cut the tissue, excessive external airflow between the inner and outer blades can cause tissue to be drawn into the gap between them, resulting in secondary injury to the patient. Insufficient external airflow between the inner and outer blades will reduce the force propelling the tissue backward, preventing it from being properly pushed into the collection box at the tail end. Utility Model Content

[0004] This invention provides a biopsy needle tube assembly and a biopsy needle to solve the technical problem that insufficient external airflow between the inner and outer tubes prevents tissue from being properly pushed into the collection box at the tail end.

[0005] This utility model provides a biopsy needle tube assembly, the biopsy needle tube assembly comprising: An outer blade tube, wherein a sampling window is provided on the outer blade tube; The inner blade tube is movably fitted inside the outer blade tube along the axial direction of the outer blade tube. The outer blade tube has an venting groove extending along its axial direction on its inner wall. The bottom wall of the venting groove has a first gap with the outer wall of the inner blade tube, and the inner wall of the outer blade tube has a second gap. The first gap and the second gap are connected to form an airflow channel.

[0006] In one embodiment of the present invention, the number of the venting grooves along the circumferential direction is set to at least two, so that a support protrusion is formed between two circumferentially adjacent venting grooves, the support protrusion having a first surface facing the inner knife tube, and a second gap is formed between the first surface and the outer wall of the inner knife tube.

[0007] In one embodiment of this utility model, the first surface is an arc surface that mates with the outer wall of the inner knife tube.

[0008] In one embodiment of the present invention, the sampling window is provided corresponding to one of the ventilation slots, and the two adjacent support protrusions are distributed on both sides of the sampling window.

[0009] In one embodiment of the present invention, the number of ventilation slots is three, wherein two of the ventilation slots are first ventilation slots symmetrically distributed on both sides of the sampling window, and the circumferential span of the two first ventilation slots is a first span, and the other ventilation slot is a second ventilation slot with a circumferential span greater than the first span, and the sampling window is correspondingly set with the second ventilation slot.

[0010] In one embodiment of the present invention, the circumferential span of each of the ventilation slots is equal; or, or, wherein the circumferential span of at least two of the ventilation slots is not equal to each other.

[0011] In one embodiment of this utility model, the height of the first gap corresponding to each of the ventilation slots along the radial direction of the outer knife tube is the same.

[0012] In one embodiment of the present invention, the heights of the first gaps corresponding to two or more of the venting grooves along the radial direction of the outer blade tube are different.

[0013] In one embodiment of the present invention, the vent groove extends through the outer blade tube in the axial direction.

[0014] This utility model also provides a biopsy needle, which includes the biopsy needle tube assembly in the above embodiments, a biopsy needle housing for mounting the biopsy needle tube assembly, and a sampling box connected to the biopsy needle housing and the inner tube.

[0015] This invention features an axially extending venting groove on the inner wall of the outer blade tube. A first gap exists between the bottom wall of the venting groove and the outer wall of the inner blade tube, and a second gap exists between the inner and outer walls of the outer blade tube. The first and second gaps communicate to form an airflow channel. By providing the venting groove, the radial height of the gap between the outer and inner blade tubes is increased, enhancing the gas flow rate between them and allowing the excised tissue to be smoothly pushed into the collection box at the tail of the biopsy needle. Simultaneously, the portion of the outer blade tube's inner wall without the venting groove provides support for the inner blade tube, ensuring stable movement of the inner blade tube within the outer blade tube. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the external knife tube structure provided in one embodiment of the present invention; Figure 2 for Figure 1 Sectional view at point AA; Figure 3 This is a schematic diagram of the structure of the inner and outer blade tubes in one embodiment of the present invention. Figure 4 for Figure 3 Sectional view at point BB; Figure 5 This is a perspective view of the fit between the inner and outer blade tubes provided in one embodiment of the present invention.

[0018] The attached figures are labeled as follows: 1-Outer blade tube; 11-Sampling window; 12-Ventilation groove; 12a-Second ventilation groove; 12b-First ventilation groove; 13-Support protrusion; 14-Second gap; 15-First gap; 2-Inner blade tube. Detailed Implementation

[0019] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0022] It should be noted that the axial direction refers to the axial direction along the outer blade tube 1, the radial direction refers to the radial direction along the outer blade tube 1, and the circumferential direction refers to the circumferential direction along the outer blade tube 1.

[0023] Please see Figures 1 to 5 The present invention provides a biopsy needle tube assembly, comprising: An outer blade tube 1, wherein a sampling window 11 is provided on the outer blade tube 1; The inner cutter tube 2 is axially movable within the outer cutter tube 1; The outer blade tube 1 has an air vent 12 extending along the axial direction of the outer blade tube 1 on its inner wall. The bottom wall of the air vent 12 has a first gap 15 between it and the outer wall of the inner blade tube 2. The inner wall of the outer blade tube 1 has a second gap 14 between it and the outer wall of the inner blade tube 2. The first gap 15 and the second gap 14 are connected to form an airflow channel.

[0024] Understandably, the outer blade tube 1 has a sampling window 11 extending through its thickness direction on its outer peripheral wall. The inner blade tube 2 is movably fitted inside the outer blade tube 1 along the axial direction. Of course, the inner blade tube 2 can also be designed to be movable along the axial direction while rotating along its own axis. The inner wall of the outer blade tube 1 has an axially extending venting groove 12. A first gap 15 exists between the bottom wall of the venting groove 12 and the outer wall of the inner blade tube 2, and a second gap 14 exists between the inner wall of the outer blade tube 1 and the outer wall of the inner blade tube 2. The first gap 15 and the second gap 14 communicate to form an airflow channel. Radially, the height of the first gap 15 is greater than the height of the second gap 14.

[0025] In traditional biopsy needle tube assemblies, because the inner tube 2 rotates forward to cut tissue, an excessively large gap between the inner tube 2 and the outer tube 1 can cause tissue to be drawn into the gap, resulting in secondary injury to the patient. A gap that is too small reduces the flow of external gas into the inner tube 2, weakening the force that propels the tissue backward and preventing it from being properly pushed into the collection box at the tail end. This embodiment, however, provides an axially extending venting groove 12 on the inner wall of the outer tube 1. A first gap 15 exists between the bottom wall of the venting groove 12 and the outer wall of the inner tube 2. A second gap 14 exists between the inner wall of the outer tube 1 and the outer wall of the inner tube 2. The first gap 15 and the second gap 14 communicate to form an airflow channel. By providing the venting groove 12, the radial height of the gap between the outer tube 1 and the inner tube 2 is increased, improving the gas flow between them and allowing the cut tissue to be smoothly pushed into the collection box at the tail end of the biopsy needle. Meanwhile, the portion of the inner wall of the outer blade tube 1 without the ventilation groove 12 can maintain support for the inner blade tube 2, allowing the inner blade tube 2 to move smoothly within the outer blade tube 1, and preventing an increase in the risk of tissue being entangled in the gap due to increased ventilation.

[0026] In some implementations, such as Figure 2 and Figure 4As shown, the number of ventilation slots 12 along the circumferential direction is set to at least two, so that a support protrusion 13 is formed between two adjacent ventilation slots 12 in the circumferential direction. The support protrusion 13 has a first surface facing the inner knife tube 2, and a second gap 14 is formed between the first surface and the outer wall of the inner knife tube 2.

[0027] There are at least two ventilation slots 12, arranged circumferentially along the inner wall of the outer blade tube 1. A support protrusion 13 is formed between two adjacent circumferential ventilation slots 12. The surface of the support protrusion 13 facing the inner blade tube 2 is the first surface, and a second gap 14 is formed between the first surface and the outer wall of the inner blade tube 2. The small gap between the first surface and the outer wall of the inner blade tube 2 serves two purposes: firstly, the support protrusion 13 supports the outer wall of the inner blade tube 2 through the first surface; secondly, it prevents the gap between the outer blade tube 1 and the inner blade tube 2 from becoming too large, reducing the risk of tissue entanglement. In this embodiment, the first surface of the support protrusion 13 is the inner wall of the outer blade tube 1. In other embodiments, the first surface of the support protrusion 13 may also protrude radially from the inner wall of the outer blade tube 1.

[0028] In some embodiments, the spans of each support protrusion 13 along the circumference of the outer blade tube 1 are all equal; or, at least two of the support protrusions 13 have unequal spans along the circumference of the outer blade tube 1. For ease of understanding, see [link to relevant documentation]. Figure 1 In this view, the outer blade tube 1 is provided with three support protrusions 13. The lower support protrusion 13 and the left support protrusion 13 have different spans in the circumferential direction, that is, the two support protrusions 13 have different spans in the axial direction.

[0029] In some implementations, such as Figure 2 and Figure 4 As shown, the first surface is an arc surface that mates with the outer wall of the inner knife tube 2.

[0030] Specifically, the first surface is an arc-shaped surface that is concave towards the supporting protrusion 13, and the curvature of the first surface is the same as the curvature of the outer wall of the inner blade tube 2. When the first surface contacts the inner blade tube 2, it can completely fit against the outer wall of the inner blade tube 2. By setting the first surface as an arc-shaped surface that matches the outer wall of the inner blade tube 2, the support effect on the inner blade tube 2 can be improved, and the gap between the first surface and the outer wall of the inner blade tube 2 can be reduced, thereby reducing the risk of tissue getting entangled.

[0031] In some implementations, such as Figure 2 and Figure 4 As shown, the sampling window 11 is correspondingly set with one of the ventilation slots 12, and two adjacent support protrusions 13 are distributed on both sides of the sampling window 11.

[0032] The sampling window 11 is located on the outer wall of the outer blade tube 1 corresponding to one of the ventilation slots 12, meaning the sampling window 11 extends radially from the outer wall of the outer blade tube 1 to the bottom wall of one of the ventilation slots 12. A support protrusion 13 is provided on each of the two circumferential sides of the sampling window 11, resulting in a very small mating gap between the inner blade tube 2 and the outer blade tube 1 at the sampling window 11, reducing the risk of tissue becoming entangled in the gap between the inner and outer blade tubes 1. By aligning the sampling window 11 with one of the ventilation slots 12, the sampling window 11 does not occupy the position of the support protrusion 13, thus indirectly increasing the number of support protrusions 13 and improving the support effect on the inner blade tube 2.

[0033] In some implementations, such as Figure 2 and Figure 4 As shown, there are three ventilation slots 12. Two of the ventilation slots 12 are first ventilation slots 12b symmetrically distributed on both sides of the sampling window 11. The span of both first ventilation slots 12b is the first span. The other ventilation slot 12 is a second ventilation slot 12a with a span greater than the first span. The sampling window 11 is set correspondingly to the second ventilation slot 12a.

[0034] There are three ventilation slots 12. Two of the ventilation slots 12 on either side of the sampling window 11 are first ventilation slots 12b, with a span of 12b equal to the first span. It should be noted that the first span is the span of the first ventilation slot 12b along the circumference of the outer blade tube 1. The other ventilation slot 12 is a second ventilation slot 12a, with a span greater than the first span. The sampling window 11 is correspondingly positioned on the second ventilation slot 12a. The second ventilation slot 12a has a larger span than the first ventilation slot 12b, and by placing the sampling window 11 on the second ventilation slot 12a, the span of the sampling window 11 is increased, preventing the cut tissue from getting stuck in the sampling window 11 and improving the efficiency of tissue extraction.

[0035] In some embodiments, the circumferential spans of each ventilator 12 are equal; or, at least two ventilator 12 have unequal circumferential spans.

[0036] Specifically, the span of each venting groove 12 along the circumference of the outer knife tube 1 is equal; or, the span of two of the venting grooves 12 along the circumference of the outer knife tube 1 is not equal; or, the span of multiple venting grooves 12 along the circumference of the outer knife tube 1 is not equal to each other; or, the span of each venting groove 12 along the circumference of the outer knife tube 1 is not equal to each other.

[0037] In some implementations, such as Figure 2 and Figure 4 As shown, the first gap 15 corresponding to each venting groove 12 has the same height along the radial direction of the outer knife tube 1.

[0038] Each of the first gaps 15 is the same size, and the airflow through each of the first gaps 15 is uniform, thereby preventing the cut tissue from sticking to the inner wall of the inner blade tube 2 due to uneven airflow when it is pushed backward, and ensuring that the cut tissue can be smoothly pushed out into the collection box at the tail.

[0039] In some embodiments, the heights of the first gaps 15 corresponding to the two or more venting slots 12 along the radial direction of the outer knife tube 1 are different.

[0040] Two of the first gaps 15 are of different sizes; or, multiple of the first gaps 15 are of different sizes; or, each of the first gaps 15 is of a different size.

[0041] In some embodiments, the vent groove 12 extends through the outer knife tube 1 in the axial direction.

[0042] The venting groove 12 extends through the outer knife tube 1 along its axial direction, that is, the venting groove 12 extends from the front end of the outer knife tube 1 to the rear end of the outer knife tube 1.

[0043] This embodiment also provides a biopsy needle, including the biopsy needle tube assembly of the above embodiment, a biopsy needle housing for mounting the biopsy needle tube assembly, and a sampling box connected to the biopsy needle housing and the inner tube 2.

[0044] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A biopsy needle tube assembly, characterized in that, include: An outer blade tube, wherein a sampling window is provided on the outer blade tube; The inner blade tube is movably fitted inside the outer blade tube along the axial direction of the outer blade tube. The outer blade tube has an venting groove extending along its axial direction on its inner wall. The bottom wall of the venting groove has a first gap with the outer wall of the inner blade tube, and the inner wall of the outer blade tube has a second gap. The first gap and the second gap are connected to form an airflow channel.

2. The biopsy needle tube assembly according to claim 1, characterized in that, The number of the venting grooves along the circumference is set to at least two, so that a support protrusion is formed between two circumferentially adjacent venting grooves. The support protrusion has a first surface facing the inner knife tube, and a second gap is formed between the first surface and the outer wall of the inner knife tube.

3. The biopsy needle tube assembly according to claim 2, characterized in that, The first surface is an arc surface that mates with the outer wall of the inner knife tube.

4. The biopsy needle tube assembly according to claim 2, characterized in that, The sampling window is provided corresponding to one of the ventilation slots, and the two adjacent support protrusions are distributed on both sides of the sampling window.

5. The biopsy needle tube assembly according to claim 2, characterized in that, The number of ventilation slots is three, two of which are first ventilation slots symmetrically distributed on both sides of the sampling window, and the circumferential span of the two first ventilation slots is the first span. The other ventilation slot is a second ventilation slot with a circumferential span greater than the first span. The sampling window is set in correspondence with the second ventilation slot.

6. The biopsy needle tube assembly according to claim 2, characterized in that, The circumferential span of each of the ventilation slots is equal; or, the circumferential span of at least two of the ventilation slots is not equal.

7. The biopsy needle tube assembly according to claim 2, characterized in that, The first gaps corresponding to each of the ventilation slots have the same height along the radial direction of the outer knife tube.

8. The biopsy needle tube assembly according to claim 2, characterized in that, The height of the first gap corresponding to two or more of the venting slots along the radial direction of the outer knife tube is different from each other.

9. The biopsy needle tube assembly according to any one of claims 1-8, characterized in that, The venting groove extends through the outer blade tube in the axial direction.

10. A biopsy needle, characterized in that, The invention includes a biopsy needle tube assembly as described in any one of claims 1-9, a biopsy needle housing for mounting the biopsy needle tube assembly, and a sampling box connected to the biopsy needle housing and the inner tube.

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