Coaxial biopsy needle capable of reducing CT artifacts

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a coaxial biopsy needle capable of reducing CT artifacts, which comprises an inner needle tube assembly, the inner needle tube assembly comprises a rear needle seat, an inner needle tube, an inner core needle and a three-edged needle head, the rear needle seat is fixedly connected with the inner needle tube, the inner needle tube is of a hollow structure, the tail part of the three-edged needle head is of a hollow structure, and the inner core needle is arranged in the three-edged needle head. One end of the inner core needle is fixed in the inner needle tube, the other end of the inner core needle is fixed in the three-edged needle head, and the inner core needle is made of nonmetal; and the three-edged needle head is fixedly connected with the inner needle tube. The inner needle tube of the puncture needle is arranged to be hollow, the inner core needle is fixed in the inner needle tube, metal artifacts of the puncture needle under CT are reduced through the material of the inner core needle, and meanwhile the strength of the needle tube is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, especially relates to a coaxial biopsy needle reducing CT artifact. BACKGROUND

[0002] CT guided human body biopsy is a widely used minimally invasive technique in clinic, such as lesion biopsy, abscess drainage, tumor ablation, etc. Coaxial biopsy needle plays an indispensable important role in the above operations. The coaxial biopsy needle commonly used in clinic is a solid metal product. The solid metal puncture needle will form obvious metal artifact under CT, which covers the puncture lesion target and interferes with the doctor's reading, thereby causing the puncture precision to decrease or fail and delaying the patient's condition. SUMMARY

[0003] The utility model aims at providing a coaxial biopsy needle reducing CT artifact to solve the above technical problems.

[0004] To achieve the above purpose, the specific technical scheme of the coaxial biopsy needle reducing CT artifact of the utility model is as follows:

[0005] A coaxial biopsy needle reducing CT artifact, comprising an inner needle tube assembly, the inner needle tube assembly comprising a rear needle seat, an inner needle tube, an inner core needle and a triangular needle head, the rear needle seat being fixedly connected with the inner needle tube, the inner needle tube being a hollow structure, the triangular needle head tail being a hollow structure, one end of the inner core needle being fixed in the inner needle tube and the other end being fixed in the triangular needle head, the material of the inner core needle being non-metal; the triangular needle head and the inner needle tube being fixedly connected.

[0006] Further, the material of the inner core needle is polyether ether ketone (PEEK), polycarbonate (PC) or polyimide (PI).

[0007] Further, the material of the inner needle tube is metal.

[0008] Further, the rear needle seat and the inner needle tube are fixedly connected through glue.

[0009] Further, the triangular needle head and the inner needle tube are fixedly bonded through welding or glue.

[0010] Further, it further comprises an outer needle tube assembly, the inner needle tube assembly being sleeved in the outer needle tube assembly and being coaxially arranged with the outer tube assembly.

[0011] Further, the outer needle tube assembly comprises a front needle seat and an outer needle tube, the front needle seat and the outer needle tube being fixedly connected, the outer needle tube being hollow, and the rear needle seat and the front needle seat being detachably fixedly connected.

[0012] Further, the front needle seat has a channel for the inner needle tube to pass through, the tail of the front needle seat has a luer head, the inner wall of the rear needle seat has an internal thread, and after the inner needle tube penetrates into the front needle seat and the outer needle tube, the front needle seat is rotationally fixed with the rear needle seat through the luer head and the internal thread.

[0013] The coaxial biopsy needle for reducing CT artifacts has the following advantages: the inner needle tube of the puncture needle is provided as a hollow structure, and an inner core needle is fixed in the inner needle tube, so that the metal artifacts of the puncture needle in CT are reduced through the material of the inner core needle, and the strength of the needle tube is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The coaxial biopsy needle for reducing CT artifacts has the following advantages: the inner needle tube of the puncture needle is provided as a hollow structure, and an inner core needle is fixed in the inner needle tube, so that the metal artifacts of the puncture needle in CT are reduced through the material of the inner core needle, and the strength of the needle tube is ensured.

[0015] Figure 2 The coaxial biopsy needle for reducing CT artifacts has the following advantages: the inner needle tube of the puncture needle is provided as a hollow structure, and an inner core needle is fixed in the inner needle tube, so that the metal artifacts of the puncture needle in CT are reduced through the material of the inner core needle, and the strength of the needle tube is ensured.

[0016] Figure 3 The coaxial biopsy needle for reducing CT artifacts has the following advantages: the inner needle tube of the puncture needle is provided as a hollow structure, and an inner core needle is fixed in the inner needle tube, so that the metal artifacts of the puncture needle in CT are reduced through the material of the inner core needle, and the strength of the needle tube is ensured.

[0017] Figure 4 The coaxial biopsy needle for reducing CT artifacts has the following advantages: the inner needle tube of the puncture needle is provided as a hollow structure, and an inner core needle is fixed in the inner needle tube, so that the metal artifacts of the puncture needle in CT are reduced through the material of the inner core needle, and the strength of the needle tube is ensured.

[0018] Marked in the figure: 1, rear needle seat; 11, internal thread; 2, inner needle tube; 3, inner core needle; 4, three-ribbed needle head; 5, front needle seat; 51, luer head; 6, outer needle tube. DETAILED DESCRIPTION

[0019] In order to better understand the purpose, structure and function of the utility model, the coaxial biopsy needle for reducing CT artifacts will be further described in detail below in combination with the drawings.

[0020] As Figure 1 shown, the coaxial biopsy needle for reducing CT artifacts comprises an inner needle tube assembly, the inner needle tube assembly comprises a rear needle seat 1, an inner needle tube 2, an inner core needle 3 and a three-ribbed needle head 4, the rear needle seat 1 is fixedly connected with the inner needle tube 2 through glue, the inner needle tube 2 is a hollow structure, the material is metal, the tail of the three-ribbed needle head 4 is a hollow structure, one end of the inner core needle 3 is fixed in the inner needle tube 2, and the other end is fixed in the three-ribbed needle head 4, the material of the inner core needle 3 is non-metal, and the three-ribbed needle head 4 and the inner needle tube 2 are fixedly bonded through welding or glue.

[0021] It is known that the metal appears artifacts in the electronic computer tomography image because the high-density characteristics of the metal cause great attenuation difference with the surrounding human tissues, thereby causing artifacts on the image.

[0022] The following table is the comparison of the density of human tissues and materials:

[0023] Tissue / material Liver Spleen Kidney Pancreas Polyether ether ketone (PEEK) Polycarbonate (PC) Polyimide (PI) Density (g / cm3) 1.05 1.05 1.08 1.05-1.1 1.32 1.2 1.4

[0024] The density of polyetheretherketone (PEEK) material is generally around 1.32 g / cm³. The CT value of PEEK under CT scans is not a fixed value, but is usually close to the CT value of human soft tissue. Generally, its CT value is between 40-80 HU (Henness units).

[0025] Polycarbonate (PC) has a density that differs somewhat from that of human tissue, but the difference is relatively small.

[0026] The density of polyimide (PI) differs somewhat from that of human tissue, but the difference is relatively small.

[0027] Therefore, in order to reduce artifacts generated by the inner needle tube 2 during CT scanning, this invention makes the inner needle tube 2 hollow, reducing the metal content. By fixing a solid inner core needle 3 inside the hollow inner needle tube 2, the overall strength of the needle tube is ensured, while the material of the inner core needle 3 reduces artifacts generated during CT scanning. The preferred material of the inner core needle 3 is polyetheretherketone (PEEK).

[0028] like Figure 3 As shown, the present invention provides a coaxial biopsy needle for reducing CT artifacts, which also includes an outer needle tube assembly and an inner needle tube assembly. The inner needle tube assembly is fitted inside the outer needle tube assembly and is coaxially arranged with the outer tube assembly. During puncture, the outer tube assembly and the inner needle tube assembly enter the human tissue together. After reaching the lesion site, the inner needle tube assembly is withdrawn to perform other surgical operations.

[0029] like Figure 2 As shown, the outer needle tube assembly includes a front needle seat 5 and an outer needle tube 6, which are fixedly connected by adhesive. The outer needle tube 6 is hollow, and the rear needle seat 1 is fixedly connected to the front needle seat 5 by threads. Figure 4 As shown, the front needle seat 5 has a channel in the middle for the inner needle tube 2 to pass through, the front needle seat 5 has a Luer head 51 at the tail, and the inner wall of the rear needle seat 1 has an internal thread 11. After the inner needle tube 2 passes through the front needle seat 5 and the outer needle tube 6, the front needle seat 5 is rotated and fixed to the internal thread 11 of the rear needle seat 1 through the Luer head 51.

[0030] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A coaxial biopsy needle for reducing CT artifacts, comprising an inner needle tube (2) assembly, characterized in that, The inner needle tube (2) assembly includes a rear needle seat (1), an inner needle tube (2), an inner core needle (3), and a rear needle seat (1) fixedly connected to the inner needle tube (2). The inner needle tube (2) has a hollow structure, and the tail of the inner needle tube (2) has a hollow structure. One end of the inner core needle (3) is fixed inside the inner needle tube (2), and the other end is fixed inside the triangular needle head (4). The material of the inner core needle (3) is non-metallic. The triangular needle head (4) and the inner needle tube (2) are fixedly connected.

2. The coaxial biopsy needle for reducing CT artifacts according to claim 1, characterized in that, The inner core needle (3) is made of polyether ether ketone, polycarbonate or polyimide.

3. The coaxial biopsy needle for reducing CT artifacts according to claim 1, characterized in that, The inner needle tube (2) is made of metal.

4. The coaxial biopsy needle for reducing CT artifacts according to claim 1, characterized in that, The rear needle seat (1) and the inner needle tube (2) are fixedly connected by glue.

5. The coaxial biopsy needle for reducing CT artifacts according to claim 1, characterized in that, The triangular needle (4) and the inner needle tube (2) are fixed and bonded by welding or glue.

6. The coaxial biopsy needle for reducing CT artifacts according to claim 1, characterized in that, It also includes an outer needle tube (6) assembly, wherein the inner needle tube (2) assembly is fitted inside the outer needle tube (6) assembly and is coaxially arranged with the outer tube assembly.

7. The coaxial biopsy needle for reducing CT artifacts according to claim 6, characterized in that, The outer needle tube (6) assembly includes a front needle seat (5) and an outer needle tube (6), which are fixedly connected. The outer needle tube (6) is hollow, and the rear needle seat (1) is detachably fixedly connected to the front needle seat (5).

8. The coaxial biopsy needle for reducing CT artifacts according to claim 7, characterized in that, The front needle seat (5) has a channel in the middle for the inner needle tube (2) to pass through. The front needle seat (5) has a Luer head (51) at the tail. The inner wall of the rear needle seat (1) has an internal thread (11). After the inner needle tube (2) passes through the front needle seat (5) and the outer needle tube (6), the front needle seat (5) is rotated and fixed by the Luer head (51) and the internal thread (11) of the rear needle seat (1).

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