WO2010088845A1

WO2010088845A1 - Disposable safety syringe with automatically retractable needle head

Info

Publication number: WO2010088845A1
Application number: PCT/CN2010/000171
Authority: WO
Inventors: 蒋文俊; 苏为祥; 徐昊华
Original assignee: 浙江康康医疗器械有限公司
Priority date: 2009-02-08
Filing date: 2010-02-08
Publication date: 2010-08-12
Also published as: CN101480511B; CN101480511A

Abstract

A disposable safety syringe with an automatically retractable needle head comprises a needle head, a needle cylinder (1) and a push rod (2). The needle head comprises a needle tube (3) and a core tube (4). The core tube (4) is a hollow tube. The needle tube (3) is fixedly inserted in the core tube (4). The push rod (2) is inserted in an inner cavity of the needle tube (1). The disposable safety syringe also comprises a needle head positioning and sealing device and a needle head retracting device. The needle head can be automatically retreated and concealed after injection.

Description

Single-use safety syringe with needle retractable automatically

The present invention relates to the field of medical device technology, and more particularly to a single-use safety syringe in which a needle can be automatically retracted. Background technique

The use of disposable sterile syringes for injecting liquid medicines and preventing vaccines has played a positive role in controlling iatrogenic infectious diseases and preventing cross-infection. However, currently used disposable syringes have many deficiencies due to their unreasonable structure. Some existing disposable syringes are exposed after use, which is easy to cause sharp injuries, and there is a hidden danger of direct cross-infection. At the same time, the syringe after use is still intact, which facilitates the recovery of some criminals. That is, the syringe that has been discarded after use is reprocessed and reused, so that it is difficult to achieve a true one-time use. There are also some syringes that are more complicated in construction, inconvenient to assemble, and the yield of finished products in the assembly is not high, which is not conducive to automatic assembly and production of the assembly line. Compared with ordinary syringes, there is still a big difference in the habit of use. Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel disposable safety syringe in which the needle can be automatically retracted in view of the deficiencies of the disposable syringe described above.

The object of the present invention is achieved by the following technical solution - a needle-returnable self-retracting disposable safety syringe comprising a needle, a syringe and a push rod, the needle comprising a needle tube and a core tube, the core tube a hollow core tube, the needle tube is fixedly embedded in the core tube, the upper end of the barrel is a small mouth end, the lower end is a large mouth end, and the push rod is inserted into the barrel cavity from the large mouth end, and is characterized in that Needle positioning sealing device and needle retracting device;

The needle positioning sealing device comprises an intermediate tube and a buckle cap, wherein the middle tube is a hollow core tube, the inner cavity is provided with a hook and a sealing hoop, and the outer side is provided with an intermediate tube hook and a buckle groove, and the buckle cap is also The utility model has a hollow core structure, and is provided with a buckle cap hook and a limiting ring, wherein the core tube of the needle is inserted into the inner cavity of the middle tube, and the hook of the middle tube abuts the bottom end of the core tube, and the sealing band Then, it is closely connected to the outer circumference of the core tube. The middle tube is inserted into the inner cavity of the small end of the hollow needle barrel, and the upper part exposes the syringe barrel. The middle tube is fastened and fastened to the buckle in the inner cavity of the syringe barrel through the buckle groove, and the buckle cap is fastened. The tube wall is inserted into the inner tube inner cavity and is jacketed on the core tube, and the upper part of the core tube protrudes through the cap hole, The buckle cap hook is placed outside the middle tube, and the buckle cap is fastened by the buckle hook hook and the middle tube hook, and the limit ring of the buckle cap is pressed against the upper boss of the core tube;

The needle retracting device comprises a compression spring, a tongue and a top plug, and a recovery cavity is arranged in the push rod, the compression spring is jacketed on the core tube, and the limiting ring of the buckle cap and the downward convexity of the core tube The tongue is placed on the intermediate tube and integrated with the hook, and the top plug is jammed at the upper end opening of the recovery chamber in the push rod.

The above-mentioned needle can automatically retract the single-use safety syringe, characterized in that it further comprises a push rod anti-backup device, wherein the push rod anti-backup device comprises a stop card basket and a stop chuck, and the stop card basket is fixed The card is snapped into the inner cavity of the lower end of the hollow cylinder, and the anti-return chuck is disposed outside the lower end of the push rod.

The above-mentioned needle can automatically retract the single-use safety syringe, characterized in that it further comprises a safety device, the safety frame of the safety device is fixedly connected to the lower end of the push rod, and comprises a safety hook groove fixedly integrated, and a safety hook head And insurance means.

The single-use safety syringe in which the needle is automatically retractable is characterized in that it further comprises a vent hole, and the vent hole is provided on the push rod.

The disposable safety syringe of the above-mentioned needle can be automatically retracted, characterized in that the cap of the buckle cap is provided with friction reducing teeth.

The above-mentioned needle can be automatically retracted by the single-use safety syringe, characterized in that the syringe, the push rod, the core tube, the middle tube, the buckle cap, the top plug and the safety frame are made of plastic material.

The disposable safety syringe of the above-described needle can be automatically retracted, characterized in that the syringe is made of a transparent plastic material.

The structure of the invention has reasonable structure design, convenient assembly, and is very suitable for automatic assembly of the production line, improves the automation degree and efficiency of the production, has good quality of automatic assembly and high qualification rate, and the invention does not change the traditional customary method when used. Convenient and reliable, the needle can be automatically retracted and hidden after the injection is completed, ensuring that the doctor and patient are protected from accidental injury of the needle tip, which is beneficial to realize the true one-time use of the syringe, avoid the spread of blood-borne diseases, and create more A hygienic and safe medical environment.

The objects, advantages and features of the present invention will be further explained by the following description of the accompanying drawings and the accompanying drawings, which are given by way of example only. DRAWINGS

1 is a schematic view of a single-use safety syringe with a protective sleeve that can be automatically retracted according to the present invention; 2 is a schematic cross-sectional view showing a single-use safety syringe with a needle retractable automatically according to Embodiment 1 of the present invention;

Figure 3 is a schematic view showing the state of the needle retraction after the injection of the disposable safety syringe with the needle retractable automatically according to the present invention;

Figure 4 is an enlarged schematic view showing the assembly structure of the core tube, the intermediate tube, the buckle cap and the compression spring of Figure 2;

Figure 5 is a schematic view of the insurable state of the safety frame;

Figure 6 is a cross-sectional view showing the intermediate tube of the present invention;

Figure 7 is a cross-sectional view of the buckle cap of the present invention;

Figure 8 is a top plan view of Figure 7;

Figure 9 is a schematic cross-sectional view of the syringe of the present invention;

Figure 10 is a cross-sectional view showing the stop card basket of the present invention;

Figure 11 is a cross-sectional view showing the combination of the push rod and the safety frame (pushing handle) and the piston of the present invention; Figure 12 is a cross-sectional view showing the core tube of the present invention;

Figure 13 is a cross-sectional view showing the top plug of the present invention;

In the above drawings: 1-front tube; 101-clip; 2-push rod; 201-recovery chamber; 202-stop chuck;

203-ventilation hole (not shown); 3-needle tube; 4-core tube; 401-upper boss; 402-lower boss; 5_ middle tube; 501-to-hook; 502-tongue; Sealing ferrule; 504-intermediate tube hook; 505-fastening groove; 6 - buckle cap; 601- buckle cap hook; 602-limit ring; 603-cap hole; 604-antifriction; 7-pressure spring; _ top plug; 9 - safety frame (pushing hand); 901-insurance hook groove; 902-insurance hook head; 903-insurance finger; 10-stop card basket; 1 1-piston; 12-needle protection cap. detailed description

Example 1

A single-use safety syringe with a needle retractable automatically as shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4 includes a needle, a syringe 1 and a push rod 2, the needle including a needle tube 3 and a core tube 4, the core tube 4 is a hollow core tube, the upper end of the mouth is a small mouth, the lower end opening is a large mouth, the needle needle 3 of the needle and the core tube 4 are connected by the prior art, the needle tube 3 is fixedly embedded in the core tube 4, The push rod 2 is inserted into the inner cavity of the syringe 1 and is fixedly provided with a piston 1 1 . The push rod 2 is inserted into the inner cavity from the large end (lower end) of the syringe 1 , and can be sealed by the piston 11 , which belongs to the prior art. The invention will not be described in detail. A needle protection cap 12 is attached to one end of the single-use safety syringe needle to which the needle can be automatically retracted. The disposable safety syringe of the present invention further comprises a needle positioning sealing device comprising an intermediate tube 5 and a buckle cap 6, the intermediate tube 5 being a hollow core tube, the inner cavity being provided with a hook 501 and a seal The hoop 503 has an intermediate tube hook 504 and a buckle groove 505 on the outer side. The main body of the buckle cap 6 is also a hollow core tube, and a buckle cap 601 and a limiting ring 602 are disposed on an outer side thereof. The core tube 4 of the needle is inserted into the inner cavity of the intermediate tube 5, and the hook 501 of the middle tube 5 abuts against the bottom end of the core tube 4, and the sealing band 503 is in close contact with the outer periphery of the core tube 4 to seal. Since the sealing ferrule 503 of the single-use safety syringe of the needle retractable by the needle of the present invention is designed as an integral member with the intermediate tube 5, not only the sealing effect is good, but also the production and assembly are very convenient. The intermediate tube 5 is sleeved in the inner cavity of the small end (upper end) of the hollow needle barrel 1, and the upper part exposes the syringe 1. The intermediate tube 5 is fixedly engaged with the syringe 1 , that is, the intermediate tube 5 is fixedly engaged with the buckle 101 in the inner cavity of the syringe 1 through the buckle groove 505 thereof. The wall of the buckle cap 6 is inserted into the inner cavity of the intermediate tube 5, and is jacketed on the core tube 4. The upper portion of the core tube 4 extends through the cap hole 603 to extend the buckle cap 6, and the buckle cap hook 601 is placed outside the intermediate tube 5. The buckle cap 6 is engaged with the middle tube hook 504 by the buckle cap hook 601 to fasten the buckle cap 6 and the intermediate tube 5, and the limit ring 602 of the buckle cap 6 is pressed against the upper boss 401 of the core tube 4. . The needle is pressed by the bottom end of the core tube 4 and the abutting of the hook 501 and the limit ring 602 against the upper boss 401 of the core tube 4, and is positioned on the syringe barrel 1.

The disposable safety syringe for automatically retracting the needle of the present invention further comprises a needle retracting device comprising a compression spring 7, a tongue 502 and a top plug 8, and a recovery chamber 201 is provided in the push rod 2 . The compression spring 7 is jacketed on the core tube 4, and the limit ring 602 of the buckle cap 6 and the lower boss 402 of the core tube 4 are pressed together. The tongue strip 502 is disposed on the intermediate tube 5 and integrally connected with the hook 501. The top plug 8 is jammed in the opening portion of the upper end of the recovery chamber 201 in the push rod 2, and the opening is jammed. When the injection of the liquid medicine is completed, when the top end of the push rod 2 pushes the top tongue 502, the tongue 502 elastically stretches outward, and the supporting hook 501 is disengaged from the core tube 4 which is abutted, and at the same time, the bottom end of the upper core tube 4 is topped. The top of the plug 8 is retracted into the recovery chamber 201 of the push rod 2, and the core tube 4 is also pressed into the recovery chamber 201 by the pressure spring 7 under the action of the pressing spring 7 to push the needle back to the recovery chamber 201. Shrink hidden.

In this embodiment, the syringe 1, the push rod 2, the core tube 4, the intermediate tube 5, the buckle cap 6, the top plug 8 and the safety frame 9 are made of a plastic material, wherein the syringe 1 is a transparent plastic material. Since the needle can be automatically retracted, the safety syringe is used for the mounting connection between the above plastic components. The assembly is very convenient and is very suitable for automatic assembly production of the assembly line.

Example 2:

This embodiment is basically similar to Embodiment 1, except that the needle of the present invention can be automatically retracted. The secondary use safety syringe further includes a push rod anti-backup device, and the push rod anti-backup device includes a stop card basket 10 and a stop chuck 202, and the anti-return card basket 10 is fixedly engaged at the large end of the hollow needle barrel 1 In the inner cavity, the stop chuck 202 is disposed outside the rear (lower) end of the push rod 2. As shown in FIG. 3, when the pusher 2 pushes the liquid medicine, the stop chuck 202 has been opened and retracted from the inner card 10, and enters the front (upper) portion of the anti-return card basket 10, so that the push rod 2 cannot be Pull back (below).

Example 3

The embodiment is substantially similar to the embodiment 1, except that the single-use safety syringe with the needle retractable according to the invention further comprises a safety device, and the safety frame 9 of the safety device is fixedly connected to the lower end of the push rod 2, The utility model comprises a safety hook groove 901 which is fixedly connected, a safety hook head 902 and an insurance finger 903. The safety hook head 902 can be disengaged from the safety hook groove 901 (shown in Figure 1) and hooked (see Figure 2). The safety frame 9 also serves as the push button for the pusher 2. When the safety hook head 902 and the safety hook groove 901 are in an unsecured state, when the push rod 2 is pushed by the hand, the insurance finger 903 is received by the large end (bottom) portion (or the back card basket 10) of the syringe 1 The topping of the push rod prevents the push rod 2 from continuing to advance, so that the needle retracting device is not activated, so as to prevent the needle from automatically retracting. When the safety finger 903 pressing the plastic material is elastically bent, the safety hook head 902 and the safety hook groove 901 are hooked, and the safety device does not have an insurance function.

Example 4

This embodiment is substantially similar to Embodiment 1, as shown in the figure, except that the disposable safety syringe of the needle retractable according to the present invention further includes a vent hole 203, and the vent hole 203 is provided on the push rod 2. Or on the safety frame 9 fixedly connected thereto, the recovery chamber 201 in the push rod 2 can communicate with the outside of the cavity without being sealed.

Further, the disposable safety syringe of the needle retractable needle of the present invention is provided with a friction reducing tooth 604 on the cap hole 603 of the buckle cap 6, which can reduce the frictional force with the buckle cap 6 when the core tube 4 is retracted.

The above embodiments are merely illustrative and are not intended to limit the invention. The invention may be implemented in other manners and steps, and will not be described in detail herein. Any technical solution formed by equivalent replacement or equivalent transformation is within the scope of protection required by the present invention.

Claims

Rights request

A disposable safety syringe with a needle retractable automatically, comprising a needle, a syringe (a cymbal and a push rod (2), the needle comprising a needle tube (3) and a core tube (4), the core tube ( 4) is a hollow core tube, the needle tube (3) is fixedly embedded in the core tube (4), the upper end of the barrel (1) is a small mouth end, the lower end is a large mouth end, and the push rod (2) is The large mouth end is inserted into the inner cavity of the syringe (1), and is characterized in that it further comprises a needle positioning sealing device and a needle retracting device;

The needle positioning sealing device comprises an intermediate tube (5) and a buckle cap (6), the intermediate tube (5) is a hollow core tube, and the inner cavity is provided with a hook (501) and a sealing band (503), the outer side The intermediate tube hook (504) and the buckle groove (505) are provided, and the buckle cap (6) is also a hollow core structure, and is provided with a buckle cap hook (601) and a limiting ring (602), The core tube (4) of the needle is inserted into the inner cavity of the intermediate tube (5), the hook (501) of the middle tube (5) abuts the bottom end of the core tube (4), and the sealing band (503) is The outer circumference of the core (4) tube is closely connected, the middle tube (5) is inserted in the inner cavity of the small end of the hollow needle cylinder (1), the upper part exposes the syringe (1), and the middle tube (5) passes through the buckle groove (505) and the needle The buckle (101) in the inner cavity of the cylinder (1) is fastened and fixed, the wall of the buckle cap (6) is inserted into the inner cavity of the intermediate tube (5), and is jacketed on the core tube (4), the core tube (4) The upper part protrudes through the cap hole (603) to extend the buckle cap (6), the buckle cap hook (601) is placed outside the middle tube (5), and the buckle cap (6) passes the buckle cap hook (601) and the middle tube The hook (504) is snap-fitted, and the limiting ring (602) of the buckle cap (6) is pressed against the upper boss (401) of the core tube (4);

The needle retracting device comprises a compression spring (7), a tongue (502) and a top plug (8), and a recovery chamber (201) is arranged in the push rod (2), and the compression spring (7) is jacketed On the core tube (4), and the limit ring (602) of the buckle cap (6) and the lower boss (402) of the core tube (4) are pressed together, and the tongue strip (502) is disposed in the middle tube (5) The upper plug (8) is integrally connected with the hook (501), and the top plug (8) is jammed at the upper end opening of the recovery chamber (201) in the push rod (2).

2. The needle-retractable disposable safety syringe according to claim 1, further comprising a push rod anti-backup device, wherein the push rod anti-backup device comprises a stop card basket (10) and The retracting tray (202) is fixedly engaged in the inner cavity of the lower end of the hollow cylinder, and the anti-return chuck (202) is disposed outside the lower end of the push rod.

3. The needle-returnable self-retracting disposable safety syringe according to claim 1, further comprising a safety device, wherein the safety frame (9) of the safety device is fixedly connected to the lower end of the push rod (2). It includes a fixed hook groove (901), a safety hook head (902) and a safety finger (903).

4. The needle-retractable disposable safety syringe according to claim 1, further comprising a venting hole (203), the venting hole (203) being provided on the push rod (2).

A disposable safety syringe for automatically retracting a needle according to claim 1, further comprising a vent (203), said vent (203) being provided on the safety frame (9).

A disposable safety syringe with a needle retractable according to claim 1, wherein the cap hole (603) of the buckle cap (6) is provided with friction reducing teeth (604).

7. A disposable safety syringe with a needle retractable according to claim 1, 2, 3, 4, 5 or 6, characterized in that said syringe (1), push rod (20), core The tube (4), the intermediate tube (5), the buckle cap (6), the top plug (8) and the safety frame (9) are made of plastic material.

8. A disposable safety syringe with a needle retractable according to claim 7, characterized in that said syringe (1) is of a transparent plastic material.