Coaxial puncture needle

Abstract

The utility model discloses a coaxial puncture needle which comprises an outer tube and an inner core needle, a clamping cap is arranged at the rear end of the inner core needle, a clamping head is arranged at the rear end of the outer tube, the clamping cap and the clamping head can be connected in a clamped mode, the inner core needle is arranged in the outer tube in a penetrating mode from back to front till the clamping head and the clamping cap are connected in a clamped mode, and at the moment, the head of the front end of the inner core needle extends out of the front end of the outer tube. The head of the front end of the inner core needle is composed of a needle tip section and a spin locking section located behind the needle tip section, the taper angle of the needle tip section is 9-15 degrees, and external threads are arranged on the side wall of the spin locking section. According to the coaxial puncture needle, due to the facts that the tip end of the head of the front end of the inner core needle is arranged to be in a pointed cone shape, the side face of the spin locking section is provided with the external threads, and the edge of the front end opening of the outer tube is machined into the cutting edge, the probability that a focus is pushed and disengaged from the needle point is reduced, and the success rate of needle biopsy is increased.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a coaxial puncture needle. Background Art

[0002] The structure of the coaxial puncture needle includes: an outer tube and an inner core needle. A cap is provided on the rear end of the inner core needle, and a head is provided on the rear end of the outer tube. The cap and the head can be connected. The inner core needle is inserted into the outer tube from back to front until the head and the cap are connected. At this time, the front end of the inner core needle extends out of the front end of the outer tube. Percutaneous puncture biopsy refers to puncturing the coaxial puncture needle into the lesion through the skin under the guidance of imaging equipment, and ensuring that the front end of the outer tube enters the lesion, then withdrawing the inner core needle, and keeping the outer tube still, and inserting another biopsy gun into the channel constructed by the outer tube to sample the lesion. In work practice, it is found that for small lesions (some are millimeter-level lesions), lesions with a hard texture, and lesions with large mobility, conventional coaxial puncture needles often cannot enter the lesions smoothly, and the lesions often shift during puncture. However, during local anesthesia before surgery, the thin and sharp local anesthesia needle tip can enter the lesion very smoothly, and the lesion does not shift. The reason was analyzed. Although the tip of the inner core needle of the conventional coaxial puncture needle was triangular, the bevel was large. For small, hard and mobile lesions, the resistance was large when puncturing the lesion, the lesion was easily displaced, and the needle tip could not enter the lesion, resulting in puncture failure. In addition, although the tip of the needle had entered the lesion for some lesions, the outer tube of the coaxial puncture needle was slightly thicker than the inner core needle and had no transition. The outer tube had greater resistance when entering the lesion, which easily caused the lesion to shift and separate from the inner core needle tip, resulting in puncture failure. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a coaxial puncture needle which can greatly improve the success rate of puncture biopsy.

[0004] In order to solve the above problems, the technical solution adopted by the utility model is: a coaxial puncture needle, comprising: an outer tube and an inner core needle, a clamping cap is provided on the rear end of the inner core needle, and a clamping head is provided on the rear end of the outer tube, the clamping cap and the clamping head can be clamped together, and the inner core needle is inserted into the outer tube from back to front until the clamping head and the clamping cap are clamped together. At this time, the front end head of the inner core needle extends out of the front end of the outer tube, and is characterized in that: the front end head of the inner core needle is composed of a needle tip section and a rotary lock section located behind the needle tip section, the cone angle of the needle tip section is 9~15°, and an external thread is provided on the side wall of the rotary lock section.

[0005] Furthermore, in the aforementioned coaxial puncture needle, the external thread on the screw-locking section is a triangular thread.

[0006] Furthermore, in the aforementioned coaxial puncture needle, the thread height of the external thread on the screw-locking section is 0.18 to 0.24 mm.

[0007] Furthermore, in the aforementioned coaxial puncture needle, the length of the needle tip section is 4 to 6 mm.

[0008] Furthermore, in the aforementioned coaxial puncture needle, the length of the lock section is 2.5 to 4 mm.

[0009] Furthermore, in the aforementioned coaxial puncture needle, the outer diameter of the inner core needle is 0.15 to 0.2 mm smaller than the inner diameter of the outer tube.

[0010] Furthermore, in the aforementioned coaxial puncture needle, the edge of the front port of the outer tube is processed into a cutting edge.

[0011] The advantages of the utility model are as follows: the coaxial puncture needle sets the tip of the front end head of the inner core needle into a sharp cone, reducing the inclined surface of the needle tip so that the needle tip can easily puncture the lesion; the lock section is cylindrical with threads on the side wall, and its diameter is equal to that of the inner core needle body; when used for puncture surgery, the needle tip section of the inner core needle is first punctured into the lesion, and then the lock section is screwed into the lesion in a rotating manner; because the surface of the lock section has threads, the front end head of the inner core needle is fixed more stably and reliably in the lesion; then the outer tube outside the inner core needle is smoothly transitioned and inserted into the lesion; because the tip of the front end head of the inner core needle is set into a sharp cone, the side of the lock section is provided with external threads, and the edge of the front port of the outer tube is processed into a cutting edge, these settings reduce the probability of the lesion being pushed and falling out of the needle tip, which is conducive to increasing the success rate of puncture biopsy. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the coaxial puncture needle described in the utility model.

[0013] Figure 2 It is a schematic diagram of the structure of the locking section of the coaxial puncture needle being screwed into the lesion.

[0014] Figure 3 It is a schematic diagram of the structure in which the outer tube of the coaxial puncture needle is pushed into the lesion.

[0015] Figure 4 It is a schematic diagram of the structure in which the inner core needle of the coaxial puncture needle reverses and detaches from the lesion, while the outer tube remains in the lesion. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below in conjunction with specific embodiments and accompanying drawings.

[0017] like Figure 1As shown, the coaxial puncture needle comprises: an outer tube 1 and an inner core needle 2, a clamping cap 3 is arranged on the rear end of the inner core needle 2, a clamping head 4 is arranged on the rear end of the outer tube 1, the clamping cap 3 and the clamping head 4 can be clamped together, the inner core needle 2 is inserted into the outer tube 1 from back to front until the clamping head 4 and the clamping cap 3 are clamped together, at this time, the front end head of the inner core needle 2 extends out of the front end of the outer tube 1, the front end head of the inner core needle 2 is composed of a needle tip section 5 and a rotary lock section 6 located behind the needle tip section 5, the cone angle α of the needle tip section 5 is 9 to 15°, and an external thread is arranged on the side wall of the rotary lock section 6.

[0018] In the present embodiment, the external thread on the lock section 6 is a triangular thread, and after being screwed into the lesion, the triangular thread can be better locked with the lesion. The screw thread height of the external thread on the lock section 6 is 0.18-0.24 mm, which is arranged in such a way that it is convenient to manufacture and can lock the lock section 6 with the lesion after being screwed in to the maximum extent. The length A of the needle tip section 5 is 4-6 mm, and the length B of the lock section 6 is 2.5-4 mm, which can make the coaxial puncture needle match most lesions. The outer diameter of the inner core needle 2 is 0.15-0.2 mm smaller than the inner diameter of the outer tube 1, which can be convenient to manufacture and can make the outer tube 1 easy to insert into the lesion 7. The edge of the front port of the outer tube 1 is processed into a cutting edge, which is arranged in such a way to reduce the resistance when the outer tube 1 is inserted into the lesion 7.

[0019] The coaxial puncture needle is now improved. The coaxial puncture needle described in the utility model sets the tip of the front end head of the inner core needle 2 into a sharp cone, reducing the inclined surface of the needle tip so that the needle tip can easily puncture the lesion. The lock segment 6 is cylindrical, with threads on the side wall, and the diameter is equal to the main body of the inner core needle 2. When used in a puncture operation, the needle tip segment 5 of the inner core needle 2 is first punctured into the lesion, and then the lock segment 6 is screwed into the lesion in a rotating manner. Because the surface of the lock segment 6 is threaded, the front end head of the inner core needle 2 is fixed in the lesion more stably and reliably, and then the outer tube outside the inner core needle 2 is smoothly transitioned and inserted into the lesion. Since the tip of the front end head of the inner core needle 2 is set to a sharp cone, the side of the lock segment 6 is provided with external threads, and the edge of the front port of the outer tube is processed into a cutting edge, these settings reduce the probability of the lesion being pushed and falling out of the needle tip, which is conducive to increasing the success rate of puncture biopsy.

Claims

1. Coaxial puncture needle, including: The outer tube and the inner core needle, the rear end of the inner core needle is provided with a clamping cap, the rear end of the outer tube is provided with a clamping head, the clamping cap and the clamping head can be clamped together, the inner core needle is inserted into the outer tube from back to front until the clamping head and the clamping cap are clamped together, at which time the front end head of the inner core needle extends out of the front end of the outer tube, characterized in that: the front end head of the inner core needle is composed of a needle tip section and a rotary lock section located behind the needle tip section, the cone angle of the needle tip section is 9 to 15 degrees, and an external thread is provided on the side wall of the rotary lock section.

2. The coaxial puncture needle according to claim 1, characterized in that: The external thread on the twist lock section is a triangular thread.

3. The coaxial puncture needle according to claim 1, characterized in that: The thread height of the external thread on the twist lock section is 0.18 to 0.24 mm.

4. The coaxial puncture needle according to claim 1, characterized in that: The length of the needle tip section is 4 to 6 mm.

5. The coaxial puncture needle according to claim 1, characterized in that: The length of the twist lock section is 2.5 to 4 mm.

6. The coaxial puncture needle according to claim 1, characterized in that: The outer diameter of the inner core needle is 0.15 to 0.2 mm smaller than the inner diameter of the outer tube.

7. The coaxial puncture needle according to claim 1, characterized in that: The edge of the front port of the outer tube is processed into a cutting edge.

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