JP3106380U - Automatic needle retractable safety syringe - Google Patents

Abstract

An automatic needle retractable safety syringe is provided.
[Solution]
A syringe 1, a needle support 2, and a piston 3, and the needle support is coupled to the front end of the syringe and includes a positive pressure chamber 24 between the needle support top surface 21 and the syringe front end; The needle support part is provided with a first puncture part 22 protruding on the top surface,
The piston is a hollow rod and has a negative pressure chamber 31 inside. The second puncture portion 33 is provided on the outer wall of the rod front end, and the rod front end surface and the outer wall 32 are covered with the plunger 4. When the piston is pushed toward the front end of the syringe, the first puncture portion 22 on the top surface of the needle support portion is pierced and destroyed by the plunger on the front end of the piston and the front end surface of the rod, and the second puncture portion 33 on the outer wall of the rod front end is pierced forward. When the needle support portion top surface 21 is cut and both chambers communicate with each other, the needle support portion top surface cut by the negative pressure in the rod is sucked and accommodated in the piston together with the needle.
[Selection] Figure 2

Description

  The present invention relates to a safety syringe that automatically retracts a needle, and in particular, a positive pressure chamber is provided between the top surface of the needle support and the front end of the syringe. The chamber is open, the needle is sucked into the piston by a change in pressure, the structure is simple and convenient to operate, and after the needle is pulled into the piston, it comes out of the syringe again The present invention relates to a safety syringe that is suitable for use in medical supplies that do not have surface problems.

  In the medical process, control of a medical condition by injecting a drug to a patient is a common medical practice, and injection of a drug by a syringe is also a fast and effective treatment, and is widely adopted by medical associations. The used needle is in contact with the patient, and if the patient's disease is infectious, the needle in contact with the patient is infectious as well. Therefore, strict care is required in the treatment of these needles, and it is necessary to prevent medical workers and waste disposal workers from being damaged by infectious needles.

  As shown in FIG. 9, the needle b of the initial syringe a was prevented from being punctured by simply covering the cap c, but the cap c was provided in accordance with the needle b, and the opening of the cap c was very large. The needle b could not be covered without aiming the needle b accurately. Therefore, in order to protect the safety of medical professionals, a variety of needle pull-back type syringes and needle protection structures have been created. As shown in FIG. 10, the so-called retractable syringe d allows the needle g to be pulled back into the syringe e when the medical staff pushes the piston f of the syringe e to the apex so that the syringe can be safely discarded. I have to.

However, the safety of syringe needle pull-back type currently on the market can achieve the purpose of pulling the needle back into the syringe, but still has the following drawbacks.
・ The design of the current needle pull-back type safety syringe is mainly provided with a structure (hook or ratchet) that mutually engages between the needle support and the piston, and when the plunger of the piston is pushed to the end, the hook When the ratchet is bitten and both are locked, the needle support portion and the needle are both pulled back into the syringe, which complicates the structural design and manufacturing process and increases the cost.
-In use, the medical staff must pull back the needle support part and the needle into the syringe with both hands, and if the force is not applied, the piston may be pulled out together with the needle, which is inconvenient and dangerous. After the needle is pulled back into the syringe, it is arbitrarily discarded or the waste disposal personnel are careless.If the piston is pushed forward, the needle is pushed out of the syringe again, losing the significance of the retractable structure. End up.
-Current needle pull-back safety syringes must be exposed by pulling out most of their piston volume from the syringe after use, increasing overall length and volume during disposal.
JP 2004-136088 A

  The present invention solves the disadvantages commonly found in known syringe needle retractable safety syringes, and the needle is automatically drawn into the piston by utilizing the suction force and propulsion force generated by vacuum negative pressure and positive pressure. The main objective is to provide a safety syringe with automatic needle retraction.

  Another object of the present invention is to provide a safety syringe that is simple in structure and convenient to operate, and does not have a safety problem that the needle comes out of the syringe again.

The injection needle automatic retractable safety syringe of the present invention includes a syringe, a needle support portion, and a piston. The syringe is a hollow tubular body and has a needle insertion hole in the center of the front end thereof. The needle support part is firmly connected to the inside of the front end of the syringe, and the needle support part has a top surface, and protrudes thereon to provide a first puncture part. The needle support part has a needle, and the needle A part is exposed outside through the insertion hole, and a positive pressure chamber is provided between the top surface of the needle support portion and the front end of the syringe. The piston is a hollow rod that can be inserted into a syringe and can move back and forth to inhale an injection drug solution. The inside of the rod is a negative pressure chamber, a second puncture portion is provided on the outer wall of the rod front end, and the rod front end and the outer wall are covered with a plunger.

  As described above, when the piston is pushed toward the front end of the syringe, the first puncture portion that protrudes on the top surface of the needle support portion destroys the plunger at the front end of the piston and pierces the front end surface of the rod. The puncture part is pierced forward to cut the top surface of the needle support part, and when both chambers are connected, the top part of the cut needle support part is sucked into the piston by the negative pressure in the rod with the needle and accommodated Is done.

・ The present invention has a positive pressure chamber between the top surface of the needle support and the front end of the syringe, the inside of the piston is a negative pressure chamber, and when the piston is pushed toward the front end of the syringe, both volume chambers communicate. The needle is pulled into the piston by the suction force due to the pressure difference, and the structure is simple and the production cost can be reduced.
・ In this device, when the piston is pushed to the front end of the syringe, the needle can be automatically pulled into the piston, so that the operator does not need to return the needle to pull out, and the operation is convenient and labor-saving. The problem of pulling out the piston together with the needle by a simple force can be avoided, and furthermore, since the piston stays in the syringe, the volume during disposal can be reduced.
In the present invention, an annular rib is further provided on the piston, the plunger is fixed, and after the injection is completed, when the piston is completely pushed to the front end of the syringe, the annular rib enters the chamber of the needle support portion, and the piston is removed from the syringe. The safety problem that the needle cannot be removed and the needle is sealed in the piston and comes out of the syringe does not occur.
As described above, the injection needle automatic retractable safety syringe provided by the present invention is rich in industrial use and practical value.

As shown in FIGS. 1 and 2, the present invention includes a syringe 1, a needle support 2 and a piston 3.
The syringe 1 is a hollow tubular body, provided with a coupling portion 10 inside the front end thereof, and provided with a needle insertion hole 11 at the center of the front end. The needle insertion hole 11 is provided projecting outward from the front end of the syringe 1, The sealing resin layer 111 is filled inside, and a through hole 112 penetrating the sealing resin layer 111 is provided.

  By providing the coupling member 20 outside the needle support portion 2, the needle support portion 2 can be firmly coupled to the inside of the front end of the syringe 1 by coupling with the coupling portion 10. The needle support portion 2 includes a top surface 21 and protrudes thereon to be provided with a first puncture portion 22, and the first puncture portion 22 is an annular protrusion on the top surface 21 of the needle support portion 2, The outer diameter is smaller than the outer diameter of the piston 3. The needle support portion 2 includes a needle 23, and the needle 23 penetrates the through hole 112 and is partially exposed outside the needle insertion hole 11. The needle support portion 2 has a top surface 21 and a syringe 1 front end. A positive pressure chamber 24 is provided therebetween.

  The piston 3 is a hollow rod that can be inserted into the syringe 1 and can move back and forth to inhale an injection drug solution. The inside of the rod is a negative pressure chamber 31, a second puncture part 33 is provided at the front end of the outer wall 32 of the rod, and the rod front end 34 and the outer wall 32 are covered with the plunger 4. The second puncture portion 33 is a sharp annular taper surface formed by shrinking from the front end of the outer wall 32 of the piston 3 toward the inner diameter, and an annular rib 35 is provided above the second puncture portion 33 of the piston 3 outer wall 32 to provide a plunger. 4 and a concave portion 41 is provided at the bottom of the plunger 4 so that the first puncture portion 22 is inserted.

  As shown in FIGS. 2 to 6, at the time of manufacture, an engagement groove is provided in the front end of the syringe 1 to form the coupling portion 10 described above, and an engagement edge is provided on the outer bottom portion of the needle support portion 2 to If the coupling member 20 is formed, when the positive pressure chamber 24 is provided between the top surface 21 of the needle support portion 2 and the front end of the syringe 1, the needle support portion 2 is firmly coupled into the front end of the syringe 1. The Thus, after completing the drug administration and separating the syringe from the patient, the piston 3 is further pushed toward the front end of the syringe 1 (shown in FIGS. 3 and 4), and the plunger that covers the front end surface 34 of the piston 3 and the outer wall 32. 4 is brought into contact with a first puncture portion 22 provided so as to protrude upward from the top surface 21 of the syringe 2, and the first puncture portion 22 is stuck through a recess 41 at the bottom of the plunger 4 so that the plunger 4 at the front end of the piston 3 and the rod front end The surface 34 is broken, and the second puncture portion 33 of the rod front end outer wall 32 is stuck forward to cut the needle support portion 2 top surface 21 so that the piston 3 continues to advance (shown in FIG. 5). . At this time, the plunger 4 just enters the inside and outside of the first puncture portion 22, and the negative pressure chamber 31 and the positive pressure chamber 24 have the front end surface 34 of the piston 3 and the needle support portion 2 top surface 21. They are cut and broken by the first puncture portion 22 and the second puncture portion 33 to form a communication state, and the top surface 21 portion of the cut needle support portion 2 together with a part of the plunger 4 and the needle 23 changes in negative pressure. Is sucked into the piston 3 (shown in FIG. 6).

  As described above, the needle 23 is accommodated in the piston 3, and when the piston 3 is completely pushed to the front end of the syringe 1, the annular rib 35 provided on the piston 3 enters into the chamber 24 of the needle support portion 2, whereby the piston Since 3 does not come out of the syringe 1 and the needle 23 is confined in the piston 3, there is no problem of coming out.

  In addition, as shown in FIG. 8, the second puncture portion is disposed around the first puncture portion 22 of the needle support portion 2 so that the second puncture portion 33 can break the top surface 21 of the needle support portion 2 more easily. A concave groove 25 into which 33 is inserted can be provided.

It is a three-dimensional appearance exploded view of an embodiment of the present invention. It is sectional drawing after the coupling | bonding of the Example of this invention. It is sectional drawing which contains the chemical | medical agent in a syringe before the injection of the Example of this invention. It is the schematic of the state which the 1st puncture part of the Example of this invention stabbed in the plunger. It is the schematic of the state which the 2nd puncture part of the Example of this invention stabbed in the top surface of the needle support part, and was cut | disconnected. It is the schematic of the state by which the needle | hook support part top surface part of the Example of this invention was attracted | sucked in the piston with the needle | hook. It is the schematic of the state by which the piston of the Example of this invention was fully pushed in to the syringe front end. In another Example of this invention, it is local sectional drawing of the ditch | groove provided around the 1st puncture part of the needle support part. It is a three-dimensional external view of a well-known needle cap. 1 is a schematic view of a use state in which a needle is pulled back into a syringe in a known needle pull-back type safety syringe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Syringe 10 coupling | bond part 11 needle insertion hole 111 resin layer 112 through-hole 2 needle support part 20 coupling | bonding member 21 top surface 22 1st puncture part 23 needle 24 container 25 concave groove 3 piston 31 container chamber 32 outer wall 33 2nd puncture part 34 front end surface 35 annular rib 4 plunger 41 recess
a syringe
b needle
c Cap
d retractable syringe
e syringe
f Piston
g needle

Claims (5)

In the safety syringe with automatic injection needle retractable,
Consists of a syringe, needle support and piston,
The syringe is formed of a hollow tubular body and forms a needle insertion hole in the center of the front end thereof.
The needle support portion is firmly connected to the inside of the front end of the syringe to form a positive pressure chamber between the top surface and the front end of the syringe, and is provided on the opposite top surface to provide a first puncture portion. The needle support part is formed by exposing a part of the needle to the outside through the needle insertion hole,
The piston is composed of a hollow rod whose inside is a negative pressure melting chamber, and is inserted into a syringe so that it can move back and forth to inhale the injection drug solution,
A second puncture part is provided on the front end of the outer wall of the rod, and the front end surface of the rod and the outer wall are covered with a plunger so that when the piston is pushed toward the front end of the syringe, it protrudes upward from the top surface of the needle support part The first puncture part is inserted into the plunger at the front end of the piston and the front end face of the rod to be cut and destroyed, and the second puncture part on the outer wall of the front end of the rod is inserted forward into the top surface of the needle support part and cut. An automatic injection needle retracting type characterized in that the two chambers communicate with each other, and the top surface portion of the cut needle support portion is sucked into the piston by a change in pressure with the needle. Safety syringe. The needle insertion hole protrudes outward, is provided at the front end of the syringe, is filled with a sealing resin layer inside, and the sealing resin layer is provided with a through-hole through which the needle passes,
In addition, a coupling part is provided inside the syringe front end and a coupling member fitted to the needle support part is provided outside the needle support part so that the needle support part is firmly coupled to the syringe front end. The automatic injection needle retractable safety syringe according to claim 1.   An engagement groove is provided in the front end of the syringe to form the above-described coupling portion, and a coupling edge is formed on the outer bottom portion of the needle support portion to form a coupling relationship by the above-mentioned fitting. 2. A safety syringe with an automatic retractable needle according to 2.   The first puncture portion is an annular projection on the top surface of the needle support portion, and has an outer diameter smaller than the outer diameter of the piston, and further forms a space for the plunger to enter inside and outside of the first puncture portion. A concave groove is provided around the first puncture portion of the needle support portion so that the second puncture portion can be inserted, and a concave portion is provided at the bottom of the plunger so that the first puncture portion can be inserted. Item 2. An automatic retractable safety syringe according to Item 1.   The second puncture portion has a sharp annular taper surface formed by shrinking toward the inner diameter from the outer wall of the piston front end, and an annular rib is provided above the second puncture portion of the piston outer wall to firmly connect the plunger. 2. The injection needle automatic retractable safety syringe according to claim 1, wherein when the syringe is pushed to the front end, the annular rib is clamped by the needle support portion to restrict movement of the piston into the syringe.

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