CN217338645U - Knife tube assembly of biopsy needle and biopsy needle - Google Patents

Abstract

The utility model provides a knife tube component of biopsy needle and biopsy needle, this knife tube component includes outer tube and inner cutter tube, be provided with the sample window on the outer tube, the inner cutter tube includes along the tool bit pipeline section and the cutter arbor pipeline section of axial direction connection, the tool bit pipeline section includes the sheltering from section that is used for sheltering from the sample window, wherein, the external diameter of sheltering from section is greater than the external diameter of cutter arbor pipeline section, have first clearance between the outer wall of cutter arbor pipeline section and the inner wall of outer tube; the outer wall of the shielding section is attached to the inner wall of the outer pipe, or a second gap smaller than the first gap is formed between the outer wall of the shielding section and the inner wall of the outer pipe. The utility model discloses in, be provided with and shelter from the section, the external diameter that should shelter from the section is greater than the external diameter of cutter arbor pipeline section for the clearance of sheltering from between section and the outer tube is dwindled, is favorable to avoiding the tissue to be drawn into the clearance between interior cutter arbor and the outer tube, avoids the live body tissue to be torn.

Description

Knife tube assembly of biopsy needle and biopsy needle

Technical Field

The utility model belongs to the field of medical equipment, especially relate to a knife tube subassembly and biopsy needle of biopsy needle.

Background

At present, a biopsy needle on the market comprises an outer tube and an inner knife tube sleeved in the outer tube, the rear end of the biopsy needle is connected with a vacuum system, the inner knife tube performs rotary motion or axial forward and backward movement relative to the inner tube of the outer tube to cut living tissues, and because the inner knife tube and the outer tube are long, in order to ensure that the inner knife tube can move smoothly in the outer tube, the gap between the inner knife tube and the outer tube is generally set to be large. The bigger clearance between interior sword pipe and the outer tube leads to the live body tissue to be rolled into in this clearance by interior sword pipe easily under the effect of negative pressure, causes the tissue winding on interior sword pipe, tears the damage live body tissue easily.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a knife tube assembly of a biopsy needle and a biopsy needle, so as to avoid the tissue from being drawn into the gap between the inner knife tube and the outer tube, and to avoid the living tissue from being torn and damaged.

To achieve the above and other related objects, the present invention provides the following technical solutions:

a knife tube assembly of a biopsy needle comprises an outer tube and an inner knife tube, wherein a sampling window is arranged on the outer tube, the inner knife tube comprises a knife head tube section and a knife bar tube section which are arranged along the axial direction, the knife head tube section comprises a shielding section for shielding the sampling window, the outer diameter of the shielding section is larger than that of the knife bar tube section, and a first gap is formed between the outer wall of the knife bar tube section and the inner wall of the outer knife tube;

the outer wall of the shielding section is attached to the inner wall of the outer cutter tube, or a second gap smaller than the first gap is formed between the outer wall of the shielding section and the inner wall of the outer cutter tube.

Optionally, the cutter head pipe section is provided with a vent hole.

Optionally, at least one group of vent hole combinations is distributed at the front end of the shielding section along the axial direction, and a single group of vent hole combinations comprises a plurality of vent holes distributed along the circumferential direction of the cutter head pipe section.

Optionally, the tool bit pipe section and the tool bar pipe section are connected into a whole along the axial direction.

Optionally, an insertion structure is arranged between the rear end of the cutter head pipe section and the front end of the cutter bar pipe section.

Optionally, an insertion section is arranged at the rear end of the cutter head pipe section, an axial limiting step is formed between the insertion section and the cutter head pipe section, the insertion section is inserted into the front end of the cutter bar pipe section in a matched mode, and the front end of the cutter bar pipe section abuts against the axial limiting step.

Optionally, the front end of the cutter bar pipe section is provided with an insertion section, an axial limiting step is formed between the insertion section and the cutter bar pipe section, the insertion section is inserted into the front end of the cutter head pipe section in a matching manner, and the rear end of the cutter head pipe section abuts against the axial limiting step.

Optionally, the cutter head pipe section is provided with a cutting edge, and the cutting edge is formed at the front end edge of the cutter head pipe section.

Optionally, the cutting head pipe section further comprises a cutting section connected to the front end of the shielding section, the cutting edge is formed at the front end of the cutting section, and the outer diameter of the cutting section is greater than or equal to the outer diameter of the shielding section.

Correspondingly, the utility model also provides a biopsy needle, including casing and knife tube assembly, the knife tube assembly is any one of the aforesaid knife tube assembly, the outer tube sets up in the casing and stretch out the casing front end, interior knife tube can outer tube internal rotation and/or axial back-and-forth movement.

The utility model discloses in, be provided with and shelter from the section, the external diameter that should shelter from the section is greater than the external diameter of cutter arbor pipeline section for the clearance of sheltering from between section and the outer tube is dwindled, is favorable to avoiding the tissue to be drawn into the clearance between interior cutter arbor and the outer tube, avoids the live body tissue to be torn.

Drawings

Fig. 1 is a schematic view of an exemplary external structure of an inner cutter tube according to the present invention;

FIG. 2 is a schematic diagram of an exemplary embodiment of a knife tube assembly of the present invention;

FIG. 3 is a schematic view of the knife tube assembly of FIG. 2 after the inner knife tube has been advanced;

FIG. 4 is an exemplary cross-sectional view of the inner cutter tube of FIG. 1;

FIG. 5 is an enlarged view taken at A in FIG. 4;

FIG. 6 is another exemplary cross-sectional view of the inner blade tube of FIG. 1;

FIG. 7 is an enlarged view at B of FIG. 6;

FIG. 8 is a front view of the segment of FIG. 4;

FIG. 9 is a schematic three-dimensional view of a segment of 8-bit tool bits;

fig. 10 is another exemplary schematic representation of the segment of fig. 4.

Description of part numbers:

an outer tube 100, a sampling window 101;

the cutter comprises an inner cutter pipe 200, a cutter head pipe section 210, a cutting edge 211, a vent hole 212, a cutter rod pipe section 220, an insertion section 201 and an axial limiting step 202.

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

In the following embodiments, the technical terms "front" and "rear" are used, wherein "front" is the direction of the needle tip of the biopsy needle; "rear" is the direction toward the operator.

The utility model discloses a biopsy needle includes casing (not shown) and this sword pipe assembly, refers to fig. 2, fig. 3, and this sword pipe assembly include outer tube 100 and endotheca in interior sword pipe 200 in the outer tube 100, outer tube 100 sets up in this casing and stretches out the casing front end, has seted up sample window 101 on the chamber wall of outer tube 100, and interior sword pipe 200 can be at outer tube 100 internal rotation and/or axial back-and-forth movement to the cutting tissue. The knife tube assemblies of the various embodiments described below may be employed in corresponding biopsy needles.

In some embodiments, referring to fig. 1, 4 to 9 in combination, the inner cutter tube 200 includes a cutter head tube section 210 and a cutter bar tube section 220 arranged along an axial direction, the cutter head tube section 210 includes a shielding section B for shielding the sampling window, wherein an outer diameter of the shielding section B is greater than an outer diameter of the cutter bar tube section 220, a first gap is provided between an outer wall of the cutter bar tube section 220 and an inner wall of the outer tube 100, and the outer wall of the shielding section B is attached to the inner wall of the outer tube 100.

In other embodiments, referring to fig. 10, the outer diameter of the shielding section B is still larger than the outer diameter of the arbor tube section 220, and the outer wall of the shielding section B and the inner wall of the outer tube 100 have a second gap therebetween smaller than the first gap.

During sampling, the knife tube assembly pierces the tissue, the tissue is squeezed into the outer tube 100 through the sampling window 101, and the inner knife tube 200 cuts the tissue inside the outer tube 100 by rotating and advancing inside the outer tube 100. Since the outer diameter of the shielding section B is larger than the outer diameter of the knife bar section 220, the fit clearance between the knife bar section 210 and the outer tube 100 is reduced, which is beneficial to avoid the tissue from being drawn into the clearance between the inner knife tube 200 and the outer tube 100 from the sampling window, and the living tissue from being torn, and the remaining knife bar section 220 still has enough clearance with the outer tube 100, which is beneficial to enable the inner knife tube 200 to still rotate and move smoothly in the outer tube 100.

In some embodiments, referring to fig. 2, 3, 8, and 9 in combination, cutting head tube section 210 is provided with a cutting edge 211 formed on the front end edge of cutting head tube section 210, and cutting edge 211 cuts tissue within outer tube 100 during rotation and advancement of inner knife tube 200. In practice it is not excluded that the blade edge 211 may be formed in other ways, as long as it is capable of cutting tissue.

In some embodiments, referring to fig. 10 in combination, the cutter head pipe section 210 further includes a cutting section a connected to a front end of the shielding section B, and the cutting edge 211 is formed at the front end of the cutting section a, and an outer diameter of the cutting section a is larger than an outer diameter of the shielding section B, such that a second gap smaller than the first gap is formed between an outer wall of the shielding section B and an inner wall of the outer pipe 100.

In other embodiments, referring to fig. 9 in combination, the cutter head pipe section 210 further includes a cutting section a connected to the front end of the shielding section B, and the cutting edge 211 is formed at the front end of the cutting section a, and the outer diameter of the cutting section a is equal to the outer diameter of the shielding section B, such that the outer wall of the shielding section B is attached to the inner wall of the outer pipe 100.

In some embodiments, referring to fig. 8 and 9, the cutter head tube section 210 is provided with a vent hole 212, and when the cutting edge 211 of the inner cutter tube 200 cuts tissue, the vent hole 212 can enable the inner cutter tube 200 to be communicated with the outside, which is beneficial to avoiding excessive internal pressure of the inner cutter tube 200, and is also beneficial to smooth movement of the inner cutter tube 200 in the outer tube 100.

In fig. 8 and 9, the vent hole 212 is a rectangular hole, but in actual implementation, the vent hole 212 may be a square hole, a circular hole, an elliptical hole, or another vent hole 212 having any shape.

In some embodiments, at least one set of vent hole combinations is distributed at the front end of the shielding section B along the axial direction, and a single set of vent hole combinations comprises a plurality of vent holes 212 distributed along the circumferential direction of the cutter head pipe section 210. For example, in fig. 8 and 9, two sets of vent hole combinations are distributed on the cutter head pipe section 210 along the axial direction.

In some embodiments, the bit tube section 210 and the bit bar tube section 220 are integrally connected in an axial direction. In the practical implementation process, the two parts can be connected into a whole by welding and the like.

In some embodiments, referring to fig. 4 to 7, an insertion structure is provided between the rear end of the tool bit tube section 210 and the front end of the tool shank tube section 220. When the cutter head pipe section 210 and the cutter bar pipe section 220 are assembled into a whole, the inserting structure can be firstly utilized to enable the cutter head pipe section 210 and the cutter bar pipe section 220 to be inserted and connected with each other, and then the cutter head pipe section 210 and the cutter bar pipe section 220 are welded into a whole, so that the cutter head pipe section 210 and the cutter bar pipe section 220 can be connected more reliably.

In some embodiments, referring to fig. 4 and 5, an insertion section 201 is disposed at a rear end of the tool bit tube section 210, an axial limiting step 202 is formed between the insertion section 201 and the tool bit tube section 210, the insertion section 201 is inserted into a front end of the tool bit tube section 220 in a matching manner, and the front end of the tool bit tube section 220 abuts against the axial limiting step 202.

In other embodiments, referring to fig. 6 and 7, an insertion section 201 is disposed at the front end of the cutter bar pipe section 220, an axial limit step 202 is formed between the insertion section 201 and the cutter bar pipe section 220, the insertion section 201 is inserted into the front end of the cutter head pipe section 210 in a matching manner, and the rear end of the cutter head pipe section 210 abuts against the axial limit step 202.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. The utility model provides a knife tube subassembly of biopsy needle, includes outer tube and interior knife tube, be provided with sample window on the outer tube, its characterized in that: the inner cutter tube comprises a cutter head tube section and a cutter bar tube section which are arranged along the axial direction, the cutter head tube section comprises a shielding section for shielding the sampling window, the outer diameter of the shielding section is larger than that of the cutter bar tube section, and a first gap is formed between the outer wall of the cutter bar tube section and the inner wall of the outer tube;

the outer wall of the shielding section is attached to the inner wall of the outer pipe, or a second gap smaller than the first gap is formed between the outer wall of the shielding section and the inner wall of the outer pipe.

2. The knife tube assembly of a biopsy needle of claim 1, wherein: the cutter head pipe section is provided with an air vent.

3. The knife tube assembly of a biopsy needle of claim 2, wherein: at least one group of vent hole combinations are distributed at the front end of the shielding section along the axial direction, and the single group of vent hole combinations comprise a plurality of vent holes distributed along the circumferential direction of the cutter head pipe section.

4. The knife tube assembly of a biopsy needle of claim 1, wherein: the cutter head pipe section and the cutter bar pipe section are connected into a whole along the axial direction.

5. The knife tube assembly of a biopsy needle of claim 4, wherein: and an inserting structure is arranged between the rear end of the cutter head pipe section and the front end of the cutter bar pipe section.

6. The knife tube assembly of a biopsy needle of claim 5, wherein: the rear end of the cutter head pipe section is provided with an inserting section, an axial limiting step is formed between the inserting section and the cutter head pipe section, the inserting section is inserted into the front end of the cutter bar pipe section in a matched mode, and the front end of the cutter bar pipe section abuts against the axial limiting step.

7. The knife tube assembly of a biopsy needle of claim 5, wherein: the front end of the cutter bar pipe section is provided with an inserting section, an axial limiting step is formed between the inserting section and the cutter bar pipe section, the inserting section is inserted into the front end of the cutter head pipe section in a matched mode, and the rear end of the cutter head pipe section abuts against the axial limiting step.

8. The knife tube assembly of a biopsy needle of claim 1, wherein: the tool bit pipeline section is provided with a cutting edge, and the cutting edge is formed at the front end edge of the tool bit pipeline section.

9. The knife tube assembly of a biopsy needle of claim 8, wherein: the cutter head pipe section further comprises a cutting section connected to the front end of the shielding section, the cutting edge is formed at the front end of the cutting section, and the outer diameter of the cutting section is larger than or equal to that of the shielding section.

10. A biopsy needle, characterized by: the cutter tube assembly is the cutter tube assembly in any one of claims 1-9, the outer tube is arranged in the shell and extends out of the front end of the shell, and the inner cutter tube can rotate and/or move back and forth in the outer tube in the axial direction.

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