CN107596509B

CN107596509B - Needle head device for safety syringe

Info

Publication number: CN107596509B
Application number: CN201710847260.6A
Authority: CN
Inventors: 张艳霞
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-09-19
Filing date: 2017-09-19
Publication date: 2022-07-08
Anticipated expiration: 2037-09-19
Also published as: CN107596509A

Abstract

The invention discloses a needle head device for a safety syringe, which comprises a needle head and a needle head thin tube, wherein a plurality of groups of pawls are distributed on the periphery of the side wall of the top of the needle head thin tube, each group of pawls comprises at least two pawls distributed along the length direction of the needle head thin tube, a plurality of pawl slots correspondingly inserted with each group of pawls are formed in the periphery of the inner wall of an inner hole at the bottom end of the needle head, ratchet blocks matched and clamped with the pawls in a one-to-one correspondence mode are fixedly arranged on the inner wall of each pawl slot, a sealing ring is sleeved on the outer wall at the top end of the needle head thin tube, and the circumferential outer wall of the sealing ring is in sealed connection with the inner wall of the inner hole of the needle head.

Description

Needle head device for safety syringe

Technical Field

The invention relates to the technical field of medical injection instruments, in particular to a needle head device for a safety injection instrument.

Background

Syringes are a common medical device. As early as the 15 th century, kathler, italian, proposed the principle of the syringe. Gas or liquid is primarily drawn or injected with a needle. Syringes may also be used for injection through rubber septa in medical devices, containers, scientific instruments such as in some chromatography.

The needle in the injector is made of metal material, about 40 hundred million needles are used in China every year, and the needle head is separately recycled after being used from the aspects of saving and resource recycling. However, most of the needle devices in the existing safety syringes adopt fixed structures, the needle head and the needle cap are difficult to realize real separation, and the recovered needle head is difficult to achieve without any plastic part.

Disclosure of Invention

The invention aims to provide a needle head device for a safety syringe, which has reasonable structural design and stable and reliable structural fixation, is beneficial to the real separation of a needle head and a needle cap and realizes the independent recycling of the needle head, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a syringe needle device for safety syringe, includes needle cap and syringe needle tubule, syringe needle tubule top lateral wall distributes all around and is provided with the multiunit pawl, and every group pawl includes two at least pawls that distribute along syringe needle tubule length direction, a plurality of pawl slots that correspond the cartridge with every group pawl are seted up all around to needle cap bottom hole inner wall, and the fixed thorn piece that clamps with the pawl one-to-one cooperation that is provided with on the pawl slot inner wall, the seal cover is equipped with the sealing washer on the outer wall of syringe needle tubule top, the circumference outer wall of sealing washer and the hole inner wall sealing connection of needle cap.

As a further scheme of the invention: the needle cap comprises a cylindrical cap at the upper end and a conical cap at the lower end, and a transition step groove is formed in the outer wall of the joint of the cylindrical cap and the conical cap.

As a further scheme of the invention: the needle head tubule and each pawl are all set up by metal material integrated into one piece.

As a further scheme of the invention: the cylinder cap and the cone cap are both integrally formed by environment-friendly plastics.

As a further scheme of the invention: the ratchet block is fixedly connected with the inner wall of the inner hole of the needle cap in an adhering manner.

As a further scheme of the invention: and a plugging glue layer is arranged on the bottom opening of the pawl slot.

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the invention, the needle thin tube and the needle cap are clamped by matching of the pawl and the ratchet block, the needle thin tube cannot be ejected upwards, and cannot be pulled downwards in a conventional use state, but the needle thin tube can be pulled downwards by a special clamp, so that the needle thin tube and the needle cap can be separated conveniently, and the needle thin tube can be recycled independently;

(2) according to the invention, a plurality of pawl slots which are correspondingly inserted into each group of pawls are formed on the periphery of the inner wall of the inner hole at the bottom end of the needle cap, the pawl slots can limit the needle thin tube to prevent the needle thin tube from rotating, and the structural connection is reliable and stable;

(3) according to the invention, the outer wall of the top end of the needle thin tube is hermetically sealed and provided with the sealing ring, and the circumferential outer wall of the sealing ring is hermetically connected with the inner wall of the inner hole of the needle cap, so that the needle device is ensured to have good sealing performance and safe operation and use.

In conclusion, the needle head is reasonable in structural design, stable and reliable in structural fixation, and beneficial to the real separation of the needle head and the needle cap, and the independent recycling of the needle head is realized.

Drawings

FIG. 1 is a perspective view of a needle device for a safety syringe;

FIG. 2 is a schematic sectional view of a needle unit for a safety syringe;

FIG. 3 is a schematic view of the needle unit for the safety syringe taken along the line A-A in FIG. 2;

fig. 4 is a schematic view showing the structure of a needle tubule in a needle unit for a safety syringe.

In the figure: 1-needle thin tube, 2-cone cap, 3-cylinder cap, 4-transition step groove, 5-sealing ring, 6-ratchet block, 7-pawl and 8-pawl slot.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 4, the present invention provides a technical solution: a needle head device for a safety syringe comprises a needle cap and a needle head thin tube 1, wherein the needle cap comprises a cylindrical cap 3 at the upper end and a conical cap 2 at the lower end, a transition step groove 4 is formed in the outer wall of the joint of the cylindrical cap 3 and the conical cap 2, and when the needle cap and the needle head thin tube 1 are disassembled, the transition step groove 4 is arranged to be beneficial to clamping the needle cap by a clamp; a plurality of groups of pawls 7 are distributed on the periphery of the side wall of the top of the needle thin tube 1, and the needle thin tube 1 and each pawl 7 are integrally formed by metal materials; each group of pawls 7 comprises at least two pawls 7 distributed along the length direction of the needle thin tube 1, a plurality of pawl slots 8 correspondingly inserted with each group of pawls 7 are formed in the periphery of the inner wall of an inner hole at the bottom end of the needle cap, and pawl blocks 6 correspondingly clamped with the pawls 7 in a one-to-one matching manner are fixedly arranged on the inner wall of each pawl slot 8, so that the needle thin tube 1 cannot be ejected upwards, and meanwhile, the needle thin tube cannot be easily pulled out; the outer wall of the top end of the needle thin tube 1 is provided with a sealing ring 5 in a sealing and sealing way, and the circumferential outer wall of the sealing ring 5 is connected with the inner wall of the inner hole of the needle cap in a sealing way.

Wherein, the ratchet block 6 is fixedly connected with the inner wall of the inner hole of the needle cap in an adhering way; and a plugging glue layer is arranged on the bottom opening of the pawl slot 8. The plugging glue layer plays a further sealing effect on the connecting structure of the needle cap and the needle head tubule 1.

The working principle of the invention is as follows: the needle thin tube 1 and the needle cap are clamped by matching the pawl 7 and the ratchet block 6, the needle thin tube 1 cannot be ejected upwards and cannot be pulled downwards in a conventional use state, but the needle thin tube 1 can be pulled downwards by a special clamp, so that the needle thin tube 1 and the needle cap can be separated conveniently, and the needle thin tube 1 can be recycled independently; a plurality of pawl slots 8 which are correspondingly inserted with each group of pawls 7 are formed in the periphery of the inner wall of the inner hole at the bottom end of the needle cap, the pawl slots 8 can limit the needle thin tube 1 to prevent the needle thin tube 1 from rotating, and the structural connection is reliable and stable; the outer wall of the top end of the needle thin tube 1 is provided with a sealing ring 5 in a sealing and sealing way, the circumferential outer wall of the sealing ring 5 is in sealing connection with the inner wall of the inner hole of the needle cap, and the needle device is ensured to have good sealing performance and safe operation and use.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a recoverable safety syringe of syringe needle is with syringe needle device, includes needle cap and syringe needle tubule (1), its characterized in that: a plurality of groups of pawls (7) are distributed on the periphery of the side wall of the top of the needle thin tube (1), each group of pawls (7) comprises at least two pawls (7) distributed along the length direction of the needle thin tube (1), a plurality of pawl slots (8) correspondingly inserted with each group of pawls (7) are formed on the periphery of the inner wall of an inner hole at the bottom end of the needle cap, ratchet blocks (6) correspondingly matched and clamped with the pawls (7) in a one-to-one correspondence manner are fixedly arranged on the inner wall of each pawl slot (8), a sealing ring (5) is hermetically sealed and mounted on the outer wall of the top end of the needle thin tube (1), and the circumferential outer wall of the sealing ring (5) is hermetically connected with the inner wall of the inner hole of the needle cap;

syringe needle tubule (1) and each pawl (7) set up by metal material integrated into one piece, and the free end slope of pawl (7) extends towards the needle cap direction.

2. The needle unit for a needle-retractable safety syringe according to claim 1, wherein: the needle cap comprises a cylindrical cap (3) at the upper end and a conical cap (2) at the lower end, and a transition step groove (4) is formed in the outer wall of the joint of the cylindrical cap (3) and the conical cap (2).

3. The needle unit for a needle-retractable safety syringe according to claim 2, wherein: the cylindrical cap (3) and the conical cap (2) are both integrally formed by environment-friendly plastics.

4. A needle unit for a needle retrievable safety syringe according to claim 2, wherein: the ratchet block (6) is fixedly connected with the inner wall of the inner hole of the needle cap in an adhering manner.

5. The needle unit for a needle-retractable safety syringe according to claim 1, wherein: and a plugging glue layer is arranged on the bottom opening of the pawl slot (8).