CN107596509B - A needle device for a safety syringe - Google Patents

Abstract

The invention discloses a needle device for a safety syringe, comprising a needle cap and a thin needle tube. A plurality of sets of ratchets are distributed around the top side wall of the thin needle tube, and each set of ratchets includes at least two sets of pawls along the length of the thin needle tube. The ratchet claws are distributed in the directions. There are a plurality of ratchet claws corresponding to each group of ratchet claws around the inner wall of the inner hole of the needle cap. The ratchet block is clamped, and the outer wall of the top end of the thin tube of the needle is sealed with a sealing ring, and the outer circumferential wall of the sealing ring is sealed with the inner wall of the inner hole of the needle cap. The needle cap is truly separated and the needle can be recycled separately.

Description

A needle device for a safety syringe

technical field

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

Background technique

A syringe is a common medical device. As early as the 15th century, the Italian Cartinel proposed the principle of the syringe. The main use of needles to extract or inject gas or liquid. Syringes can also be used in medical devices, containers, and scientific instruments such as some in chromatography to inject through rubber septa.

The needles in the syringes are made of metal. About 4 billion needles are used in China every year. From the perspective of saving and resource reuse, the needles should be recycled and disposed of separately after use. However, most of the needle devices in the existing safety syringes adopt a fixed structure, and it is difficult to achieve true separation of the needle and the needle cap, and it is difficult to achieve that the recovered needle does not have any plastic parts attached to it.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a safe syringe needle device with reasonable structure design, stable and reliable structure fixation, which is conducive to the true separation of the needle and the needle cap, and realizes the independent recycling of the needle, so as to solve the problems raised in the above background technology.

To achieve the above object, the present invention provides the following technical solutions:

A needle device for a safety syringe, comprising a needle cap and a thin needle tube, a plurality of groups of ratchets are distributed around the top side wall of the thin needle tube, and each set of ratchets includes at least two ratchets distributed along the length direction of the thin needle tube. The inner wall of the inner hole at the bottom end of the needle cap is provided with a plurality of ratchet slots corresponding to each group of ratchets, and the inner wall of the ratchet slots is fixedly provided with ratchets that are matched with the ratchets in a one-to-one correspondence. The outer wall of the top end of the thin needle tube is sealed with a sealing ring, and the circumferential outer wall of the sealing ring is sealedly connected with the inner wall of the inner hole of the needle cap.

As a further solution of the present invention: the needle cap includes a cylindrical cap at the upper end and a conical cap at the lower end, and a transition step groove is provided on the outer wall of the connection between the cylindrical cap and the conical cap.

As a further solution of the present invention, the thin needle tube and each pawl are integrally formed with metal materials.

As a further solution of the present invention: both the cylindrical cap and the conical cap are integrally formed with environmentally friendly plastics.

As a further solution of the present invention: the spine block is bonded and fixed to the inner wall of the inner hole of the needle cap.

As a further solution of the present invention, a sealing glue layer is provided on the bottom opening of the pawl slot.

Compared with the prior art, the beneficial effects of the present invention are:

(1) In the present invention, the thin needle tube and the needle cap are fitted together by the pawl and the ratchet block. The thin needle tube cannot be pushed out upwards, nor can it be pulled out downwards under normal use. The clamp pulls out the thin needle tube downward, which is conducive to the separation of the thin needle tube and the needle cap, and facilitates the separate recycling of the thin needle tube;

(2) In the present invention, a plurality of pawl slots corresponding to each set of pawls are provided around the inner wall of the inner hole at the bottom end of the needle cap. The pawl slots can limit the needle capillary and prevent the needle capillary from rotating. , the structural connection is reliable and stable;

(3) In the present invention, a sealing ring is sleeved on the outer wall of the top of the thin needle tube, and the circumferential outer wall of the sealing ring is sealedly connected with the inner wall of the inner hole of the needle cap to ensure that the needle device has good sealing performance and is safe to operate and use.

To sum up, the present invention has a reasonable structure design, stable and reliable structure fixation, is conducive to the true separation of the needle head and the needle cap, and realizes the independent recycling of the needle head.

Description of drawings

1 is a three-dimensional schematic structural diagram of a needle device for a safety syringe;

Fig. 2 is a kind of structural representation of the cross-section of the needle device for a safety syringe;

Fig. 3 is the structural representation of A-A section in Fig. 2 of a kind of needle device for safety syringe;

Figure 4 is a schematic structural diagram of a thin needle tube in a needle device for a safety syringe.

In the picture: 1- Needle thin tube, 2- Conical cylinder cap, 3- Cylinder cap, 4- Transition step groove, 5- Seal ring, 6- Ratchet block, 7- Pawl, 8- Pawl slot.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1 to 4, the present invention provides a technical solution: a needle device for a safety syringe, comprising a needle cap and a thin needle tube 1, the needle cap includes a cylindrical cap 3 at the upper end and a conical cap 2 at the lower end , a transition step groove 4 is provided on the outer wall of the connection between the cylindrical cap 3 and the conical cylinder cap 2. When the needle cap and the needle thin tube 1 are disassembled, the setting of the transition step groove 4 is helpful for the clamp to clamp the needle cap; There are multiple groups of pawls 7 distributed around the top side wall of the tube 1, and the thin needle tube 1 and each pawl 7 are integrally formed with metal materials; The ratchet 7, the inner wall of the inner hole at the bottom end of the needle cap is provided with a plurality of ratchet slots 8 corresponding to each group of ratchets 7, and the inner wall of the ratchet slot 8 is fixedly provided with the ratchets 7 one by one. Corresponding to the ratchet block 6 fitted with the card, the thin needle tube 1 cannot be pushed upward, and the thin needle tube will not be easily pulled out; the outer wall of the top of the thin needle tube 1 is sealed with a sealing ring 5, and the sealing ring 5 The outer circumferential wall of the needle cap is sealed with the inner wall of the inner hole of the needle cap.

Wherein, the ratchet block 6 is bonded and fixedly connected with the inner wall of the inner hole of the needle cap; the bottom opening of the ratchet slot 8 is provided with a sealing glue layer. The sealing glue layer has a further sealing effect on the connection structure of the needle cap and the needle thin tube 1 .

The working principle of the present invention is as follows: between the thin needle tube 1 and the needle cap, the ratchet pawl 7 and the ratchet block 6 are used for clamping, so that the thin needle tube 1 cannot be pushed out upwards, nor can it be pulled out downwards under normal use conditions. However, the thin needle tube 1 can be pulled down through a special clamp, which is conducive to the separation of the thin needle tube 1 and the needle cap, and facilitates the separate recycling of the thin needle tube 1; A pawl slot 8 corresponding to each group of pawls 7 is inserted. The pawl slot 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 sealing sleeve is provided with a sealing ring 5, and the circumferential outer wall of the sealing ring 5 is sealedly connected with the inner wall of the inner hole of the needle cap to ensure that the needle device has good sealing performance and is safe to operate and use.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (5)

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).

Images