Split type injection needle of transurethral cystoscope

Abstract

The split type injection needle of the transurethral cystoscope comprises a needle head and a sheathing canal, the needle head comprises a needle tip and a needle seat fixedly connected to the rear end of the needle tip; an external thread is arranged at the joint of the needle seat and the needle tip; the sheathing canal is a PVC plastic pipe with two open ends, the rear end of an inner hole of the sheathing canal is provided with internal threads, and the front end of the inner hole of the sheathing canal is provided with a positioning hole; the sheathing canal is in screwed fit with the external threads on the needle head through the internal threads, the sheathing canal is in transition fit with the front end of the needle point through the positioning hole, and a gap is formed between a middle hole of the sheathing canal and the needle point. The disposable syringe has the advantages that the injection needle and the sheathing canal are in a split type, the injection needle can be repeatedly disinfected and used, and medical cost is saved; according to the cystoscope injection needle, the sheath tube is made of PVC materials, the wall thickness of the middle portion of the sheath tube reaches 0.6 mm, so that the sheath tube has toughness and is not prone to folding, when the sheath tube is connected with the needle head, the front end and the rear end of the sheath tube are matched with the injector and the needle head respectively, and compared with a cystoscope injection needle in the prior art, the cystoscope injection needle has higher strength, better stability and better guidance quality.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a transurethral cystoscope split injection needle. Background Art

[0002] Cystoscope injection needles are used for injection of urethra, bladder neck and bladder wall through cystoscope. The structure of cystoscope injection needles currently used clinically includes a needle and a sheath sleeved outside the needle. The needle and sheath are designed as an integrated unit and are disposable products.

[0003] The above-mentioned cystoscopic injection needle is easy to be damaged during the injection operation due to the thin wall of the sheath tube and the sheath tube material is flexible plastic, which leads to low injection efficiency. Usually, in order to ensure the effect of the operation, at least two cystoscopic injection needles (630 yuan / piece) are required, and the injection cost is high. Summary of the invention

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a transurethral cystoscopic split injection needle, which solves the problem that the existing cystoscopic injection needle is easily broken and lost during the injection operation, resulting in low injection efficiency and high injection cost.

[0005] The technical scheme of the utility model is: a transurethral cystoscope split injection needle, comprising a needle head and a sheath tube; the needle head comprises a needle tip and a needle seat fixedly connected to the rear end of the needle tip, and an external thread is arranged at the connection between the needle seat and the needle tip; the sheath tube is a PVC plastic tube with two open ends, the rear end of the inner hole of the sheath tube is provided with an internal thread, the front end of the inner hole of the sheath tube is provided with a positioning hole, and the hole section of the inner hole of the sheath tube between the internal thread and the positioning hole is defined as an intermediate hole;

[0006] The sheath is screwed together with the external thread on the needle through the internal thread, and the sheath forms a transition fit with the front end of the needle tip through the positioning hole, and a gap is formed between the middle hole of the sheath and the needle tip; when the sheath is installed outside the needle tip, the front end of the needle tip is exposed 0.6-1.0 cm from the end face of the sheath.

[0007] A further technical solution of the utility model is: the length of the sheath is 44.2 cm, the outer diameter of the sheath is 2.5 mm, the diameter of the middle hole of the sheath is 1.3 mm, and the diameter of the sheath positioning hole is 0.6 mm; the outer diameter of the needle tip is 0.6 mm, and the inner diameter of the needle tip is 0.3 mm. When the sheath is installed outside the needle tip, the total length of the sheath and the exposed part of the front end of the needle tip is 45 cm, and at this time, the front end of the needle tip exposes 0.8 cm of the end face of the sheath.

[0008] A further technical solution of the utility model is that the specification of the needle seat is No. 6 / 23G.

[0009] A further technical solution of the utility model is that the sheath tube is provided with scale lines along the length direction.

[0010] Compared with the prior art, the utility model has the following advantages:

[0011] 1. It adopts a split design with the sheath and the needle threaded together, which is detachable and the injection needle can be sterilized and reused repeatedly, saving medical costs.

[0012] 2. The sheath is made of a harder PCV material, and the wall thickness of the middle part of the sheath reaches 0.6mm ((2.5-1.3) / 2), which makes the sheath both tough and not easy to fold. When the sheath is connected to the needle, the sheath cooperates with the needle at the front and rear ends respectively (the sheath at the rear end is screwed with the external thread on the needle through the internal thread, and the sheath at the front end forms a transition fit with the front end of the needle tip through the positioning hole). Compared with the cystoscopic injection needle in the prior art, it has higher strength, better stability and better guidance.

[0013] 3. During injection, the drug solution flows through the inner holes of the needle seat and the needle tip in sequence, and finally ejects from the front end of the inner hole of the needle tip. Compared with the cystoscopic injection needle in the prior art, the problem of drug solution leaking into the sheath is avoided (this problem exists in the prior art).

[0014] The utility model is further described below in conjunction with the figures and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a component separation diagram of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the utility model.

[0017] Special note: Since the aspect ratio of the needle tip and the sheath is too large, if they are drawn in full, the details will not be clear in the figure, so they are represented by shortening the length using a double spline curve. DETAILED DESCRIPTION

[0018] like Figure 1-2 As shown, the transurethral cystoscopic split injection needle includes a needle and a sheath 3.

[0019] The needle includes a needle tip 1 and a needle seat 2 fixedly connected to the rear end of the needle tip 1. The connection between the needle seat 2 and the needle tip 1 is provided with an external thread. The needle seat 2 and the needle tip 1 are respectively provided with an inner hole, and the inner holes of the two are connected end to end. The sheath tube 3 is a PVC plastic tube with open ends. The rear end of the inner hole of the sheath tube 3 is provided with an internal thread 31, and the front end of the inner hole of the sheath tube 3 is provided with a positioning hole 32. The hole section of the inner hole of the sheath tube 3 between the internal thread 31 and the positioning hole 32 is defined as an intermediate hole 33. The sheath tube 3 is screwed (threadedly connected) with the external thread on the needle through the internal thread 31, and the sheath tube 3 forms a transition fit with the front end of the needle tip 1 through the positioning hole 32, and a gap is formed between the intermediate hole 33 of the sheath tube 3 and the needle tip 1.

[0020] Preferably, the length of the sheath 3 is 44.2 cm, the outer diameter of the sheath 3 is 2.5 mm, the diameter of the middle hole 33 of the sheath 3 is 1.3 mm, and the diameter of the positioning hole 32 of the sheath 3 is 0.6 mm; the outer diameter of the needle tip 1 is 0.6 mm, and the inner diameter of the needle tip 1 is 0.3 mm. When the sheath 3 is installed outside the needle tip 1, the total length of the sheath 3 and the exposed part of the front end of the needle tip 1 is 45 cm, and at this time, the front end of the needle tip 1 is exposed by 0.8 cm from the end face of the sheath 3.

[0021] Preferably, the specification of the needle seat 2 is No. 6 / 23G, which is the common specification of the base of the injection needle in the industry, and the suitable syringe can be selected based on this specification.

[0022] Preferably, the sheath tube 3 is provided with scale lines along the length direction for identifying the length of the sheath tube and the needle tip under cystoscopy, thereby improving the injection efficiency.

Claims

1. A transurethral cystoscopic split injection needle, characterized by: It comprises a needle and a sheath tube; the needle comprises a needle tip and a needle seat fixedly connected to the rear end of the needle tip, an external thread is arranged at the connection between the needle seat and the needle tip; the sheath tube is a PVC plastic tube with two open ends, an internal thread is arranged at the rear end of the inner hole of the sheath tube, a positioning hole is arranged at the front end of the inner hole of the sheath tube, and the hole section of the inner hole of the sheath tube between the internal thread and the positioning hole is defined as an intermediate hole; the sheath tube is screwed with the external thread on the needle through the internal thread, the sheath tube forms a transition fit with the front end of the needle tip through the positioning hole, and a gap is formed between the intermediate hole of the sheath tube and the needle tip; when the sheath tube is installed outside the needle tip, the front end of the needle tip is exposed 0.6-1.0 cm from the end face of the sheath tube.

2. The transurethral cystoscopic split injection needle according to claim 1, characterized in that: The length of the sheath is 44.2cm, the outer diameter of the sheath is 2.5mm, the diameter of the middle hole of the sheath is 1.3mm, and the diameter of the sheath positioning hole is 0.6mm; the outer diameter of the needle tip is 0.6mm, and the inner diameter of the needle tip is 0.3mm. When the sheath is installed outside the needle tip, the total length of the sheath and the exposed part of the front end of the needle tip is 45cm, and at this time the front end of the needle tip is exposed 0.8cm from the end face of the sheath.

3. The transurethral cystoscopic split injection needle as claimed in claim 2, characterized in that: The needle holder specification is No. 6 / 23G.

4. The transurethral cystoscopic split injection needle as claimed in claim 3, characterized in that: The sheath tube is provided with scale lines along the length direction.

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