CN1127358C - Safety syringe with improved structure - Google Patents

Abstract

The invention relates to a safety syringe with an improved structure, which comprises a needle cover, a needle cylinder, a needle seat, a piston, a push rod and an injection needle. The syringe needle is fixed on the needle seat, the needle seat is sleeved on the top end of the syringe, the neck part of the front end of the push rod in the syringe is sleeved with a hollow soft piston, and the piston is slightly deformed when being pushed to the bottom of the syringe, so that the push rod can be continuously pushed to release the syringe liquid from the needle seat completely. The front end of the push rod is provided with an elastic hook, the inner edge of the bottom end of the needle seat is provided with a pawl, and when the push rod is pushed, the side edge of the hook is smoothly embedded with the pawl, so that the push rod can be pulled back by force, and the needle seat and the needle head can be retracted into the needle cylinder. Safe use, no residual injection or blood, and effective overcoming of secondary pollution.

Description

Safety syringe with improved structure

The present invention relates to a medical device, more precisely a safety syringe.

The syringes used in medical treatment were recycled in the past. Although they are strictly and thoroughly sterilized after each use, there is always the phenomenon of incomplete disinfection, thus there is a hidden danger of secondary infection. At present, the syringes used in medical treatment have developed into disposable syringes that are discarded after use, but a large number of discarded syringes have created new environmental pollution and safety problems, and the needles of discarded syringes are not treated in any way. If it is exposed outside, it is easy to scratch the medical staff or cleaning staff, causing viruses or bacteria to be transmitted with the syringe. For the various syringes with disposable needles researched to solve the above problems, its main function is also to prevent personnel from being stabbed by the needles of discarded syringes. For example, in a safety syringe, a protruding hook is provided on the plunger, and the hook is engaged with the tail of the needle holder, and then the needle holder and the injection needle are pulled back into the syringe, and the injection needle is bent and destroyed. Although this design has improved the deficiency of easily stabbing personnel, it has produced another shortcoming, that is, when the hook of the plunger is to be engaged with the tail of the needle seat, there is often residual residual material between the plunger and the syringe. A small amount of liquid medicine, and the airtight space formed when the hook is in contact with the tail of the needle holder will cause the hook of the plunger to form an obstacle when engaging with the tail of the needle holder, making it impossible to engage smoothly. Therefore, in clinical use, The medical staff must first pull out the injection needle from the patient, and then push the hook of the plunger to engage with the tail of the needle seat. The propulsion action of the plug is carried out, thus forming another pollution path.

The purpose of this invention is to design a safety syringe with an improved structure, which can make no residual injection liquid remain in the syringe, completely eliminate blood backflow, prevent secondary pollution, and do not need to pull out the injection needle from the human body before pushing it against it. Rod, which can improve the vibration caused by force.

The object of the present invention is achieved in this way: a safety syringe with an improved structure, including a needle cover, a syringe, a needle seat, a piston, a push rod and a needle head, the needle seat is a seat body for fixing the needle head, and the needle seat passes through the sleeve At the top of the syringe, the push rod is put into the syringe, and it is characterized in that: the inner edge of the upper end of the syringe is provided with a blocking part, and the syringe close to the set part forms an annular jaw; The inner edge of the tail end forms an arc-shaped detent spine; the push rod forms a neck in the front section, and a tapered elastic detent hook is formed on the top of the neck; the piston is made of soft material, and the piston is provided with a through-hole Set the space, the piston is sleeved on the neck of the push rod.

The needle seat also includes a collar, the needle seat is inserted on the top of the syringe, and the collar is blocked from the blocking part of the syringe.

The tapered elastic hook is provided with a groove.

The tapered elastic hook is hollow inside.

The safety syringe with improved structure of the present invention uses the neck of the push rod in the syringe to penetrate the piston, and the piston can be made of soft rubber material. When the piston is pushed to the end of the syringe, the push rod can move forward again in the piston. The injection solution in the syringe is completely injected out, and the hook of the push rod and the spine of the needle seat are fitted and fixed after the second push, and will not move back, and the blood can be completely discharged Backflow, so no blood remains on the needle, keep the needle clean to prevent secondary pollution.

In the safety syringe with the improved structure of the present invention, the neck of the front end of the push rod is pierced by a piston, and when the piston is pushed to the tail of the syringe, the push rod can be pushed forward for a second time in the piston, so that the push rod goes up The catch hook of the needle seat is fitted and fixed with the catch spine in the needle seat, which can prevent the traditional structure of the syringe from forming an airtight phenomenon when it reaches the bottom, so that the push rod in the syringe cannot be pushed out due to the resistance of the liquid medicine that cannot be compressed. The shortcoming that the liquid medicine is completely injected.

In the safety syringe with the improved structure of the present invention, the catch hook at the front end of the push rod has telescopic elasticity because it is provided with a groove or is hollow. With its tapered surface, the catch hook enters the catch thorn and fits and fixes with it. Therefore, it is not necessary to apply more force, and it is not necessary to pull out the injection needle from the human body and then push it against the push rod. It can also improve the use of traditional structures. Vibration caused by force when injecting.

The technology of the present invention will be further described below in conjunction with the embodiments and accompanying drawings.

Fig. 1 is a schematic diagram of the three-dimensional appearance structure of the safety syringe of the present invention

Fig. 2 is a three-dimensional exploded schematic diagram of the needle seat, piston and push rod of the safety syringe of the present invention

Fig. 3 is an enlarged schematic diagram of the combined structure of the needle seat, piston and push rod of the safety syringe of the present invention

Fig. 4 is a schematic diagram of the combined structure of the needle seat, piston and push rod of the safety syringe of the present invention

Fig. 5 is a combined structure schematic diagram of the safety syringe of the present invention

Fig. 6 is a structural schematic view of another embodiment of the hook in the safety syringe of the present invention

In the figure, 10 is the needle cover, 11 is the needle barrel, 12 is the supporting part, 13 is the blocking part, 14 is the annular jaw, 15 is the protruding ring, 20 is the needle seat, 21 is the through hole, 22 is the plug part , 23 is the collar, 24 is the ratchet, 30 is the piston, 31 is the accommodation space, 40 is the push rod, 41 is the push and hold part, 42 is the neck, 43 is the hook, 44 is the groove, 50 is the injection needle .

Referring to Fig. 1 and Fig. 2, the safety syringe of the improved structure of the present invention includes a needle cover 10, a syringe 11, a needle seat 20, a piston 30, a push rod 40 and an injection needle 50 (see Fig. 5). Wherein the needle cover 10 and the injection needle 50 are the same as the syringe of the traditional structure, and will not be repeated.

Refer to Fig. 3 to Fig. 6, and refer to Fig. 1 and Fig. 2 in combination. The bottom of the syringe 11 in Fig. 1 and Fig. 5 is a supporting part 12, and the inner edge of the upper end of the syringe 11 in Fig. 4 and Fig. 5 is a blocking part 13, and the syringe 11 near the blocking part 13 forms an annular jaw part 14 , a protruding ring 15 is set at the inner diameter of the bottom end of the syringe 11 . In Fig. 2 to Fig. 5, the needle seat 20 is the seat body for fixing the injection needle 50, which is inserted on the top of the syringe 11, and is blocked by the collar 23 and the blocking part 13, and a through hole 21 and a plug are formed on it. The part 22 is the part for fixing the injection needle 50 and allowing the injection liquid to pass through. At the tail end of the plug part 22, a barb-shaped catch thorn 24 is formed. The piston 30 in FIG. 2 and FIG. 3 is made of soft rubber material, and there is a through accommodating space 31 inside. The tail end of the push rod 40 is a pushing part 41 (seeing Fig. 2 and Fig. 5 ), forming a neck 42 near the front end, forming a tapered hook 43 at the upper end of the neck 42, and setting a groove 44 on the hook 43, as shown in Figure 3.

When the above components are combined, the needle base 20 is inserted on the top of the syringe 11, and the collar 23 and the blocking part 13 are blocked and positioned. At the same time, the injection needle 50 is set on the needle base 20, and the piston 30 is sleeved in advance. At the neck 42 of the push rod 40 , put the push rod 40 in its entirety from the rear end of the syringe 11 , and push the piston 30 to the position where it fits with the annular jaw 14 to form a standby state.

After the makeup injection needle 50 penetrates into the human body, use the pushing part 41 of the push rod 40 to slowly give a thrust, and the injection liquid is injected into the human body. When the piston 30 is pushed to the annular jaw 14, the push rod 40 The catch hook 43 of the front end is also positioned at the outside of the catch spine 24, as shown in Figure 3, at this moment, the injection liquid has mostly entered the human body (while the piston of the traditional structure injection needle, at this time due to the residual liquid medicine and the syringe An airtight space is formed in between, the liquid medicine cannot be compressed, and the push rod cannot move forward, so that the hook of the plunger will form an obstacle when engaging with the tail of the needle seat, and cannot engage smoothly, so the injection needle needs to be pulled out first Then do the snap-fitting again, which will lead to the major shortcoming that the residual liquid medicine is brought out thereupon), because the piston 30 of the improved structure of the present invention is to be located at the neck 42 of the push rod 40 in a sleeve-through manner, so the push rod 40 can still Pushing forward, the injection needle does not need to be pulled out of the human body to perform the second pushing action, and the remaining injection liquid can be injected into the human body, while the piston 30 is slightly compressed, and at the same time, the hook 43 is inserted into the inner side of the ratchet 24, as shown in the figure 4. As shown in Figure 5, the push rod 40 is fitted and positioned so that it will not move back. At this time, when the injection needle 50 is pulled out, because the catch hook 43 has engaged with the catch spine 24, the injection needle 50 is There will be no residual injection liquid and blood brought out, and will not cause secondary pollution.

When the push rod 40 implements the second push, it is mainly to make the hook 43 embed the inner side of the ratchet 24, and use the designed groove 44 to make the hook 43 elastic and easy to enter the ratchet 24, and make the push rod 40 It is in a steady forward shape, without sudden momentum, which will make the patient uncomfortable, and will not suck the blood back to the injection needle 50 due to the slight pull back of the push rod 40 when the injection needle 50 is pulled out, so that it can be completely Eliminate secondary pollution and keep the syringe 11 clear. In particular, the catch hook 43 is tapered and provided with a groove 44 , so that the catch hook 43 is labor-saving and smooth when inserted into the inside of the catch spine 24 . On the other hand, the inner edge of the catch thorn 24 is set as a circular arc edge, and the outer edge is set as a flat shape, so that when it is embedded with the catch hook 43, it is easy to enter and difficult to get out, so it can be directly inserted without pulling the injection needle out of the human body. , and after embedding, as long as a little force is applied, the needle seat 20 can be pulled back into the syringe, as shown in Figure 5, forming a completely safe syringe.

In addition to designing the groove 44 on the catch hook 43, it can also be designed as a hollow cone, as shown in Figure 6, so that the catch hook 43 has elasticity, and it can save effort when entering the catch thorn 24 smoothly, and the embedded card Then snap firmly. Therefore, according to this design concept, a structure with the same function as the catch hook 43 can also be designed.

The safety syringe of the improved structure of the present invention is also suitable for subcutaneous tissue or blood vessel type syringes.

To sum up, the structure of the needle seat, piston and push rod in the syringe of the present invention can directly perform a second push without pulling out the injection needle from the human body, so that the injection in the syringe can be completely injected. There will be no residue, and there will be no discomfort to the human body due to the application of force or the liquid medicine will be taken out when it is pulled out. Compared with the traditional structure of the syringe, its technology has significantly improved.

Claims (2)

1. A safety syringe with an improved structure, including a needle cover, a syringe, a needle seat, a piston, a push rod and a needle. The needle seat is a seat for fixing the needle, and the needle seat is inserted on the top of the needle barrel. The push rod is put into the syringe, and it is characterized in that: the inner edge of the upper end of the syringe is provided with a blocking part, and the syringe close to the set part forms an annular jaw; the inner edge of the tail end of the needle seat forms an arc-shaped catch spine; the push rod forms a neck at the front section, and a tapered elastic catch hook is formed on the top of the neck; the piston is made of soft material, and the piston is provided with a penetrating accommodating space, and the piston is sheathed in the The neck of the push rod; wherein the tapered elastic hook is provided with a groove, and the inside of the tapered elastic hook is hollow. 2. A safety syringe with an improved structure according to claim 1, characterized in that: the needle seat also includes a collar, the needle seat passes through the top of the syringe, and the collar and the syringe block The ministry refused.

Images