WO2006039862A1

WO2006039862A1 - A back pulling type injector with improved needle seat operation structure

Info

Publication number: WO2006039862A1
Application number: PCT/CN2005/001663
Authority: WO
Inventors: Lung-O Liu
Original assignee: Lung-O Liu
Priority date: 2004-10-15
Filing date: 2005-10-10
Publication date: 2006-04-20
Also published as: CN1759893A

Abstract

A back pulling type injector with improved needle seat operation structure comprises a needle cylinder 10 a plunger 30 a plug 40 a needle seat 50 and an outer cylinder 70 . The needle cylinder 10 comprises a cylinder body 11 a needle seat engagement portion 16 and an outer cylinder coupling portion 19 . The cylinder body has an orifice 12 ; The plunger 30 comprises a stem 31 and a push-pull portion 37 . The stem 31 can be inserted into the orifice 12 of the needle cylinder. The plug 40 can be inserted into the orifice 12 of the needle cylinder. The needle seat 50 comprises a needle cylinder engagement portion 52 and an outer cylinder lock 57 ; The outer cylinder 70 includes a cylinder body 71 , a needle seat lock 76 and a needle cylinder coupling portion 79 .

Description

Pull-back type needle seat operation structure improved syringe

Technical field

The invention relates to medical equipment, in particular to a syringe with improved operating structure of the pull-back type needle holder. Background technique

Pressed, the known syringe has a design with a protective sleeve attached to the syringe. After the injection is completed, the protective sleeve is detached to disengage the needle holder.

However, usually, during the use process, the engagement force between the needle seat and the outer cylinder is insufficient, so that during the process of pulling back the pull rod, the needle seat is separated from the outer cylinder and pulled back together with the syringe, so The medicine cannot be successfully completed, and the syringe may not be used normally, which makes the use inconvenient. Summary of the invention

In view of the above shortcomings, the applicant has painstakingly developed an improved injector for the operation of the pullback type of the present invention, which achieves the following creative purposes.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a syringe having an improved operating structure of a pull-back type needle holder which allows the needle holder to be stably fixed without being displaced during the pumping state.

A second object of the present invention is to provide a syringe having an improved operation structure of a pull-back type needle holder, which is easy to operate by fixing the needle holder, and which has a simple fixing structure and is easy to manufacture.

The invention provides a syringe with an improved operation structure of the pull-back type needle seat, which is provided for the connection of a needle, and the syringe comprises:

a syringe having a barrel body having a receiving hole, a needle seating portion, and an outer tube coupling portion;

a push rod having a shaft for inserting a receiving hole of the syringe, a push-pull portion for pushing and pulling a finger; a stopper having a plug body attached to the push rod for being movablely inserted on the needle The receiving hole of the barrel;

a needle holder having a body for connecting a needle, a needle barrel connecting portion connected to the needle holder portion of the barrel, and an outer tube card portion;

An outer cylinder having a barrel body forming a set of holes for sleeving the needle seat and the barrel of the needle barrel, a needle seat card portion for locking the outer tube card portion of the needle seat, and a syringe coupling portion Engaged and separated from the outer cylinder coupling portion of the syringe.

The coupling portion of the barrel of the outer cylinder and the outer tube coupling portion of the barrel are screwed. Wherein the needle coupling portion of the outer cylinder is also through the thickness of the cylinder wall, and the outer cylinder coupling portion of the cylinder is convex. The outer cylinder coupling portion of the cylinder and the needle coupling portion of the outer cylinder may also be disposed in the middle portion or the front portion.

The syringe has a needle hook portion, and the needle holder has a needle hook portion for the needle hook portion of the syringe to be hooked.

The needle hook portion of the needle barrel has a convex ring shape, and the needle hook portion of the needle holder is a concave hole.

The hooking force of the needle seat and the syringe is smaller than the engagement force of the outer cylinder of the outer cylinder. The outer tube portion of the needle holder is a plurality of elastic pieces.

The outer cylinder further has a plurality of needle holders disposed on the sleeve holes for tightening the needle holder.

Wherein the stopper is engageable with the syringe at a predetermined position. DRAWINGS

In order to further illustrate the technical content of the present invention, the following detailed description will be made in conjunction with the embodiments and the accompanying drawings, wherein FIG. 1 is a plan sectional view of a preferred embodiment of the present invention.

Figure 2 is a plan sectional view of a preferred embodiment of the present invention.

Fig. 3 is a view showing a state in which a drug is taken out in accordance with a preferred embodiment of the present invention.

Fig. 4 is a view showing a state in which the medicine is completed in a preferred embodiment of the present invention.

Fig. 5 is a view showing the state in which the stopper is locked in the syringe according to a preferred embodiment of the present invention.

Figure 6 is a diagram showing the state in which the push rod and the syringe are pulled back in accordance with a preferred embodiment of the present invention.

Fig. 7 is a view showing the state in which the outer cylinder is detached according to a preferred embodiment of the present invention.

Figure 8 is a schematic view showing the structure of another preferred embodiment of the present invention.

Figure 9 is a schematic view showing the structure of still another preferred embodiment of the present invention.

Figure 10 is a cross-sectional view of the secant line along the 1 0 - 10 0 in Figure 9.

Figure 1 is a schematic view showing the structure of still another preferred embodiment of the present invention. detailed description

Referring to FIG. 1 to FIG. 7 , a syringe with improved operation structure of the pull-back type needle holder is connected to a needle N having a joint N 1 and a needle N 3 , which is a needle N. It is possible to set a needle cover C.

The syringe of the present invention comprises:

a syringe 1 Q having a cylindrical body 1 1 in a straight cylindrical shape with a receiving hole 1 2 , and a thrust portion 1 3 formed on a front end of the barrel 1 1 , a stop portion 15 is formed in the front portion of the receiving hole 1 2 , a needle seating portion 16 is disposed at the front end of the barrel 1 1 , and a holding ear 17 is connected thereto. A rear end of the barrel body 1 1 , a push rod retaining edge 18 is disposed in the receiving hole 12 2 near the opening, and the four outer tube coupling portions 19 are externally threaded on the outer circumference of the barrel body 1 1 .

a push rod 30 has a receiving hole 1 2 into which the shaft 3 1 can be inserted, a stopper 3 3 is connected to the shaft 3 1, and a breaking portion 34 is formed. Between the shaft 3 1 and the stopper 3 3 , a hooking portion

3 5 is formed on the outer periphery of the stopper piece 3 3 , a abutting portion 36 is located at the front end of the shaft 3 1 , a push-pull portion 37 is disposed at the rear end thereof for pushing and pulling of the finger, and a retaining portion 3 8 can be abutted The push rod retaining edge 18 of the syringe 1 D terminates.

a stopper 40 has a plug body 4 1 in a conical disk shape and can be slightly elastically deformed, and a syringe card edge 4 2 is formed on the outer periphery of the plug body 41 to be forwardly passed and rearwardly locked. The latching portion 15 of the syringe 10, a pusher latching member 4 3 is connected to the plug body 4 1 and forms a latching hole 4 4 , and a hooking portion 45 is formed in the latching hole

4 4 can be hooked to the hooking portion 35 of the push rod 30, abutting portion 46 can be abutted against the abutting portion 36 of the push rod 30, and a balance tube 4 8 is connected in a ring shape. In the plug body 41.

a needle holder 50 has a body 5 1, a syringe joint portion 5 2 is formed with a set of holes that can be sleeved on the needle holder 1 of the syringe 10, and a needle joint portion 5 _{3 is} available for the needle N The joint N 1 is sleeved, a liquid through hole 5 4 , a needle card portion 5 5 is internally threaded for the needle N to be screwed, an outer tube abutting portion 5 6 , and an outer tube portion 5 7 is formed by a ring A barrel 58 and a card edge 59 are formed.

An outer cylinder 70 has a barrel body 7, a set of holes 7 2 open to one end, a needle seat abutment portion 7 3 is provided at the other end of the opening and is formed with a set of holes 7 4 and is available for the needle seat The outer tube abutting portion 56 of the 50 is abutted, and the plurality of pin holders 7 5 are disposed in the sleeve hole 7 2 for tightening the needle holder 50, and the needle seat portion 7 6 is provided for the card slot. The end is between the two blocks 7 7 and 7 8 , and the four-needle coupling portion 7 9 is internally threaded at the opening near the inner edge of the barrel 7 1 and can be respectively associated with the outer cylinder 10 The barrel coupling portion 1 9 is screwed into the card fixing position.

Regarding the operation of this embodiment, it is explained as follows: '

As shown in FIG. 2, the syringe 10 is screwed to the syringe coupling portion 9 of the outer cylinder 70 by the outer cylinder coupling portion 19, and the needle holder 50 is subjected to the syringe 10 and The outer cylinder 70 is forced to be in a stable state.

Figure 3 is a view showing the state of the medicine, in the stroke of the push or pull, the stopper 40 balance cylinder 48 is abutted against the wall of the receiving hole 12 of the cylinder 10, and the stopper can be blocked. 40 is in balance, and the needle holder 50 is not pulled back.

Figure 4 is in its standby state, the needle hub 5 Q is slightly tightened to the needle hub bundle 7 of the outer cylinder 7 Q, and the user can temporarily not need to retract the needle cover C without the needle N exposed.

As shown in FIG. 5, the push rod 30 is pushed forward to push the abutting portion 3 6 against the abutment portion 4 of the stopper 40. The cylinder card edge 4 of the stopper 40 is forced to elastically deform by the stopper portion 15 of the cylinder 10; then, the push rod 30 is pushed to the bottom to make the stopper 40 The plug body 4 1 is pressed against the thrust portion 13 of the syringe 10, and the drug solution can be injected.

As shown in FIG. 6, the push rod 30 is first pulled back to the rear, since the syringe card edge 4 2 of the stop 40 will block against the stop card portion 15 of the syringe 10, The latching member 3 of the push rod 30 is disengaged from the latching hole 44 of the latch 40, and the latch 40 is still locked to the receiving hole 12 of the syringe 10.

Next, the syringe 10 and the outer cylinder 70 are pulled to the opposite sides, and the cylinder 10 is interlocked with the needle holder 50, and the outer cylinder portion 57 of the needle holder 50 is pulled back. The card edge 5.9 is disposed on the needle seat card portion 76 of the outer tube 70; when the syringe 10 is disengaged from the outer tube 7Q, the needle N is still connected to the needle holder 50 and is accommodated in The sleeve hole 7 2 of the outer cylinder 70 does not fall out, as shown in Fig. 7, so that the needle stick can be prevented.

It should be emphasized here that the syringe of the present invention does not limit the foregoing structure, and other self-destroying syringes such as various conventional rubber plugs and push rods can be applied to the combined cost invention, and Safe syringe with self-destruction and needle protection.

In addition to the above embodiments, the present invention can also be implemented as follows: ' As shown in FIG. 8, the syringe coupling portion 7 9 A of the outer cylinder can also be the thickness of the through-tube wall, and the outer tube coupling portion of the barrel 1 9 A can also be convex. .

Furthermore, as shown in FIG. 9 and FIG. 10, the outer cylinder coupling portion 9 9 B of the syringe and the needle coupling portion 7 9 B of the outer cylinder are disposed in the front portion (or also in the middle portion). The syringe can be applied to different lengths; wherein the ring of the outer tube portion of the needle holder is changed to a plurality of elastic pieces 5 8 B, which are spaced apart from the threads of the respective needle coupling portions 7 9 B so that the needle holder is not Blocked and pulled back smoothly.

The engagement of the syringe with the hub can also be as follows:

In addition, as shown in FIG. 11 , the syringe has a needle-shaped hook portion 1 6 1 C in a convex ring shape, and the needle holder has a syringe hook portion 5 2 1 C as a concave hole. The needle hook portion 1 6 1 C of the syringe is inserted and hooked; wherein the hook sleeve and the syringe are separated from each other by a force that is smaller than the outer sleeve of the outer cylinder, so that the needle is small The seat is indeed stuck in the outer cylinder.

Illustrated by the above embodiments, the features of the present invention can be summarized as follows -

A syringe with an improved structure for the pull-back type of the needle holder of the present invention, which allows the needle holder to be stably fixed without being displaced during the pumping state.

2. The syringe with improved operation structure of the pull-back type needle seat of the invention has the advantages of simple operation of fixing the needle seat, simple structure and easy manufacture.

Claims

Rights request

A syringe having an improved structure for a pull-back type of needle hub, which is a needle-connectable device, characterized in that the injector comprises:

A syringe with improved operating structure for a pull-back type needle hub according to claim 1, wherein the coupling portion of the barrel of the outer cylinder and the outer cylinder coupling portion of the barrel are screwed.

3. The syringe of the improved pull-back type operating structure according to claim 1, wherein the syringe coupling portion of the outer cylinder is also through the thickness of the cylinder wall, and the outer cylinder coupling portion of the cylinder is It is convex.

A syringe with improved operating structure for a pull-back type needle hub according to claim 1, wherein the outer cylindrical coupling portion of the syringe and the needle coupling portion of the outer cylinder are also provided in the middle portion or the front portion.

5. The syringe of the improved pull-back type operating structure according to claim 1, wherein the syringe further has a needle hook portion, and the needle holder further has a syringe hook portion for the needle The needle seat hook of the cylinder is inserted and hooked.

6. The syringe of the improved pull-back type operating structure according to claim 5, wherein the needle hook portion of the syringe is convexly shaped, and the needle hook portion of the needle holder is concave. hole.

7. The syringe of the improved pull-back type needle operating structure according to claim 5, wherein the hook-and-cylinder disengagement force is greater than the engagement force of the outer cylinder of the outer cylinder. Small.

8. The syringe of the pull-back type needle holder operating structure according to claim 1, wherein the outer tube portion of the needle holder is a plurality of elastic pieces.

9. The improved syringe of the pull-back type needle-operated structure according to claim 1, wherein the outer cylinder further has a plurality of needle holders disposed on the sleeve for tightening the needle holder.

A syringe having an improved operating structure of a pull-back type needle hub according to claim 1, wherein the stopper is engageable with the syringe at a predetermined position.