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Disposable syringe

A disposable syringe has a needle seat with an upper segment adapted to be sleeved over by a needle unit, and a lower segment retained in a passage of a barrel. A plunger has a stem portion movable in the passage, a surrounding engaging portion in sealing contact with the passage so as to be moved by the stem portion of the plunger in a position of use, and a head which is moved towards and is held by a grip segment in the needle seat when the surrounding engaging portion is depressed by an edge portion of the needle seat by virtue of a continuing depression force of the plunger, thereby permitting the needle seat to be brought into the passage for safe disposal.

Disposable syringe device auxiliary unit for preventing iatrogenic infection through needle

A disposable syringe device auxiliary unit of the present invention for preventing iatrogenic infection through a needle includes a cap holding section for disposing and holding therein a cap which covers, when a medical treatment is performed, a needle positioned at the extreme end of a syringe barrel constituting a disposable syringe device; and a needle separating section for separating the needle, which is covered with the cap and fitted on an end of the syringe barrel, therefrom.

Disposable syringe

A disposable syringe includes a tubular barrier member retained in a rear passageway of a barrel. A tubular needle seat for fixing a needle cannula is retained on the barrier member, and abuts against an abutment wall in the front passageway of the barrel while the needle cannula is disposed outwardly of the barrel. A plunger is slidable in the rear passageway, and has a seal member to seal a cavity confined in a plunger body and containing a fluid at a reduced pressure. When a pushing force applied to the plunger body moves the barrier member against the first and second frictional forces, the needle seat is released, and the seal member is ruptured, so that the needle seat and the needle cannula are suctioned into the cavity due to the pressure difference between the ambient atmosphere and the reduced pressure.

Disposable syringe

A disposable syringe comprises a syringe body (1), a plunger (40) mounted on a stem (50) slidable inside the syringe body (1), and an injection needle (10) integral with a needle-carrier (11) engageable with the fore end (2) of the syringe body (1) or the plunger, retaining means (20 23 24) able to retain spring means (30) under compression being provided integrally with the syringe body (1) and engagement means (59) able to cooperate with the retaining means (23) to release the spring means (30), when the plunger (40) has reached the end of its stroke, being provided integrally with said stem (50), so that the spring means (30) can act on the stem (50) to cause retraction thereof into the retracted position.


Disposable syringe with a retractable needle
Disposable syringe device auxiliary unit for preventing iatrogenic infection through needle


PAT. NO. Title
1 7066906 Disposable syringe
2 6848157 Disposable syringe device auxiliary unit for preventing iatrogenic infection through needle
3 6743199 Disposable syringe
4 6716191 Disposable syringe
5 6663593 Disposable syringe with plunger rupture
6 6639047 Biodegradable disposable syringe
7 6582406 Disposable syringe
8 6562009 Pump piston for a disposable syringe
9 6514231 Disposable syringe with single variable volume chamber
10 6485474 Closure arrangement for a disposable syringe
11 6458105 Disposable syringe having a retractable needle
12 6450993 Half-disposable syringe barrel
13 6440106 Biodegradable disposable syringe
14 6352522 Disposable syringe assembly
15 6331174 Prefilled, low particle, sterile disposable syringe for injecting preparations and procedure for manufacture
16 6129711 Fluid-containing plastic disposable syringe that is to be sterilized and a process for filling and sealing same
17 6017325 Disposable syringe with automatically retractable hypodermic needle
18 6010481 Safe disposable syringe
19 5993417 Disposable syringe with an automatically retractable hypodermic needle
20 5785683 Disposable syringe with two variable volume chambers
21 5575776 Single dose, prefilled, disposable syringe
22 5554122 Disposable syringe
23 5527287 Preloaded automatic disposable syringe
24 5496285 Disposable syringe
25 5489267 Double chamber disposable syringe
26 5395346 Disposable syringe with a retractable needle
27 5328485 Disposable syringe with needle cover
28 5275582 Disposable syringe
29 5257976 Single use disposable syringe
30 5135512 Disposable syringe for injections
31 5125899 Disposable syringe for once-only use
32 5116320 Disposable syringe for once-only use
33 5066281 Disposable syringe apparatus with retractable needle, locking device and cap device
34 5062833 Non-reusable disposable syringe and locking device
35 5037382 Disposable syringe
36 4995874 Disposable syringe device
37 4986812 Locking device preventing reuse of a disposable syringe
38 4973318 Disposable syringe
39 4955871 Single-use disposable syringe
40 4894054 Preloaded automatic disposable syringe
41 4880410 Disposable syringe
42 4878899 Disposable syringe for one-time use
43 4850977 Button activated automatic needle sheath for disposable syringe
44 4675005 Retractable disposable syringe
45 4634428 Cover for a disposable syringe
46 4518385 Disposable syringe for needleless injector
47 4515591 Disposable syringe cartridge for fluid delivery apparatus
48 4410323 Predosed disposable syringe
49 4391272 Disposable syringe
50 4317446 Prefilled disposable syringe

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