US6863659B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sharp safe hydraulic retractable syringe
Assignee: Individual
•
Filing: 2001-12-10
•
Granted: 2005-03-08
•
Expires: 2021-12-10
Abstract
Abstract Sharp safe hydraulic retractable syringe that is supplied with a hypodermic needle ( 4 ) fully housed within an elongated hollow barrel ( 2 ) which cannot be used until the plunger rod stop ( 16 ) has been removed and the plunger rod ( 1 ) has been pushed into the loading position to receive the required liquid into the elongated hollow barrel ( 2 ). The hydraulic retractable syringe assembly is preceded by a retractable mechanism ( 6 - 15 ) that is pre-assembled. The mechanism is contained by a three-legged retaining clip ( 11 ) to hold twin conical helical shape springs ( 14-14 d ) separated by a spring separation plate ( 15 ) within two spring retaining cups ( 12-13 ). Twin conical shape springs are released by the hydraulic pressure exerted by the liquid onto the activating ring with three moulded pistons ( 8 ) which passes through a sealing member ( 9 ) and exerts axial pressure onto the three release slides ( 10 a, 10 b, 10 c ) to introduce radial pressure onto the three-legged clip ( 11 ) to release the conical spring pressure placed onto two spring retaining cups ( 12-13 ) causing the twin conical helical shape springs ( 14-14 d ) to be set apart and retract up into the elongated hollow barrel. The three-legged retaining clip ( 11 ) has two of its three legs preset so as to force the spring separating plate ( 15 ) against the hypodermic needle ( 4 ) causing the hypodermic needle ( 4 ) to misalign and thereby rendering the sharp safe hydraulic retractable syringe non-functional for reuse. This invention can be incorporated into any syringe.
Inventors
- 👤 Bruce George Sharpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:03
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/32; A61M5/3205; A61M5/321; A61M5/322; A61M5/3234; A61M5/315; A61M5/31501; A61M2005/31508; A61M5/3221; A61M2005/3223; A61M2005/3224; Y; Y10; Y10S; Y10S128/00; Y10S128/917; Y10S128/919
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
267 words
A single use hypodermic syringe with a retracting needle system comprising: a cylindrical body element for containing a fluid; a needle assembly comprising a needle holding member and a hollow needle, the needle holding member repositionable between an injecting position wherein the needle projects axially outward from the body element and a pre-use and post-use position wherein the needle is retracted and contained completely within the body element; a plunger rod reciprocally received into the body element forming a fluid chamber between the cylindrical body element, the plunger and the needle holding member, and whereby positive and negative pressure forces are generated by adjustment of the plunger within the body element whereby fluid is drawn into, and expelled from, the body element through the hollow needle; a retraction mechanism comprising: a spring between the needle holding member and the axial end of the cylindrical body element through which the needle member projects and which generates an axial pressure on the needle holding member; at least one retaining member engaging the needle holding member and retaining the needle holding member against the axial force of the spring; at least one activating member within the needle holding member responding to positive fluid pressure within the fluid chamber to release the retaining member from the needle holding member; whereby the needle is automatically deployed into the injecting position by depression of the plunger prior to drawing fluid into the fluid chamber and is automatically retracted within the body element at the completion of an injection stroke of the plunger and which retraction renders the syringe safe for handling and disposal.
Claim 2
Dependent Claim
267 words
A single use hypodermic syringe with a retracting needle system comprising: a cylindrical body element for containing a fluid; a needle assembly comprising a needle holding member and a hollow needle, the needle holding member repositionable between an injecting position wherein the needle projects axially outward from the body element and a pre-use and post-use position wherein the needle is retracted and contained completely within the body element; a plunger rod reciprocally received into the body element forming a fluid chamber between the cylindrical body element, the plunger and the needle holding member, and whereby positive and negative pressure forces are generated by adjustment of the plunger within the body element whereby fluid is drawn into, and expelled from, the body element through the hollow needle; a retraction mechanism comprising: a spring between the needle holding member and the axial end of the cylindrical body element through which the needle member projects and which generates an axial pressure on the needle holding member; at least one retaining member engaging the needle holding member and retaining the needle holding member against the axial force of the spring; at least one activating member within the needle holding member responding to positive fluid pressure within the fluid chamber to release the retaining member from the needle holding member; whereby the needle is automatically deployed into the injecting position by depression of the plunger prior to drawing fluid into the fluid chamber and is automatically retracted within the body element at the completion of an injection stroke of the plunger and which retraction renders the syringe safe for handling and disposal.
Claim 3
Dependent Claim
53 words
The hypodermic syringe of claim 1 wherein said activating member comprises an activating ring with pistons attached cooperating with an activating release slide, whereby positive fluid pressure within the fluid chamber pushes the activating ring piston against the activating release slide which in turn releases the retaining clip from the needle holding member.
Claim 4
Dependent Claim
13 words
The hypodermic syringe of claim 1 wherein the spring is conical helical spring.
Claim 5
Dependent Claim
15 words
The hypodermic syringe of claim 3 wherein the spring is a twin conical helical spring.
Claim 6
Dependent Claim
17 words
The hypodermic syringe of claim 4 wherein the twin conical helical spring includes a spring separation member.
Claim 7
Dependent Claim
18 words
The hypodermic syringe of claim 1 wherein the spring are received between a pair of spring retaining cups.
Claim 8
Dependent Claim
20 words
The hypodermic syringe of claim 6 wherein one of spring retaining cups is integrally formed with the needle holding member.
Claim 9
Dependent Claim
29 words
The hypodermic syringe of claim 1 wherein a plurality of activation members are equidistantly spaced around the needle holding member, each activation member cooperating with a corresponding retaining member.
Claim 10
Dependent Claim
21 words
The hypodermic syringe of claim 8 wherein a slide member is located between each activation member and each corresponding retaining member.
Claim 11
Dependent Claim
30 words
The hypodermic syringe of claim 5 wherein the twin conical spring and the spring separation member cooperate to deflect the hollow needle from axial alignment when in the post-use position.
Claim 12
Dependent Claim
330 words
A single use hypodermic syringe with a retracting needle system comprising: a cylindrical body element for containing a fluid; a needle assembly comprising a needle holding member and a hollow needle, the needle holding member repositionable between an injecting position wherein the needle projects axially outward from the body element and a pre-use and post-use position wherein the needle is retracted and contained completely within the body element; a plunger reciprocally received into the cylindrical body element forming a fluid chamber between the cylindrical body element and the needle holding member, and whereby positive and negative pressure forces are generated by adjustment of the plunger within the body element whereby fluid is drawn into, and expelled from, the cylindrical body element through the hollow needle; a retraction mechanism comprising: a spring between the needle holding member and the axial end of the cylindrical body element through which the needle member projects and which generates an axial force on the needle holding member, wherein the spring is a twin conical helical springs and include a spring separation member and is received between a pair of spring retaining cups, both spring retaining cups being integrally formed with the needle holding member; at least one retaining member engaging the needle holding member and retaining the needle holding member against the axial force of the spring; a plurality of activating members within the needle holding member equidistantly spaced around the needle holding member moulded on a ring, responding to positive fluid pressure within the fluid chamber to release a corresponding retaining member from the needle holding member, and a slide member located between each activation member and each corresponding retaining member; whereby the needle is automatically deployed into the injecting position by depression of the plunger prior to drawing fluid into the fluid chamber and is automatically retracted within the cylindrical body element at the completion of an injection stroke of the plunger and which retraction renders the syringe safe for handling and disposal.
Claim 13
Dependent Claim
330 words
A single use hypodermic syringe with a retracting needle system comprising: a cylindrical body element for containing a fluid; a needle assembly comprising a needle holding member and a hollow needle, the needle holding member repositionable between an injecting position wherein the needle projects axially outward from the body element and a pre-use and post-use position wherein the needle is retracted and contained completely within the body element; a plunger reciprocally received into the cylindrical body element forming a fluid chamber between the cylindrical body element and the needle holding member, and whereby positive and negative pressure forces are generated by adjustment of the plunger within the body element whereby fluid is drawn into, and expelled from, the cylindrical body element through the hollow needle; a retraction mechanism comprising: a spring between the needle holding member and the axial end of the cylindrical body element through which the needle member projects and which generates an axial force on the needle holding member, wherein the spring is a twin conical helical springs and include a spring separation member and is received between a pair of spring retaining cups, both spring retaining cups being integrally formed with the needle holding member; at least one retaining member engaging the needle holding member and retaining the needle holding member against the axial force of the spring; a plurality of activating members within the needle holding member equidistantly spaced around the needle holding member moulded on a ring, responding to positive fluid pressure within the fluid chamber to release a corresponding retaining member from the needle holding member, and a slide member located between each activation member and each corresponding retaining member; whereby the needle is automatically deployed into the injecting position by depression of the plunger prior to drawing fluid into the fluid chamber and is automatically retracted within the cylindrical body element at the completion of an injection stroke of the plunger and which retraction renders the syringe safe for handling and disposal.
Claim 14
Dependent Claim
251 words
A needle retraction mechanism for a single use hypodermic syringe having a cylindrical body element for containing a fluid and a plunger reciprocally received into the body element forming a fluid chamber between the cylindrical body element and the needle holding member, and whereby positive and negative pressure forces are generated by adjustment of the plunger within the cylindrical body element whereby fluid is drawn into, and expelled from, the cylindrical body element through the hollow needle, comprising: a needle assembly comprising a needle holding member and a hollow needle, the needle holding member repositionable between an injecting position wherein the needle projects axially outward from the body element and post-use position wherein the needle is retracted and contained completely within the cylindrical body element; a spring between the needle holding member and the axial end of the cylindrical body element through which the needle member projects and which generates an axial force on the needle holding member; at least one retaining member engaging the needle holding member and retaining the needle holding member against the axial force of the spring; at least one activating member within the needle holding member responding to positive fluid pressure within the fluid chamber to release the retaining member from the needle holding member comprising: an activating ring piston cooperating with an activating release slide, whereby positive fluid pressure within the fluid chamber pushes the activating ring piston against the activating release slide which in turn releases the retaining clip from the needle holding member.
Claim 15
Dependent Claim
251 words
A needle retraction mechanism for a single use hypodermic syringe having a cylindrical body element for containing a fluid and a plunger reciprocally received into the body element forming a fluid chamber between the cylindrical body element and the needle holding member, and whereby positive and negative pressure forces are generated by adjustment of the plunger within the cylindrical body element whereby fluid is drawn into, and expelled from, the cylindrical body element through the hollow needle, comprising: a needle assembly comprising a needle holding member and a hollow needle, the needle holding member repositionable between an injecting position wherein the needle projects axially outward from the body element and post-use position wherein the needle is retracted and contained completely within the cylindrical body element; a spring between the needle holding member and the axial end of the cylindrical body element through which the needle member projects and which generates an axial force on the needle holding member; at least one retaining member engaging the needle holding member and retaining the needle holding member against the axial force of the spring; at least one activating member within the needle holding member responding to positive fluid pressure within the fluid chamber to release the retaining member from the needle holding member comprising: an activating ring piston cooperating with an activating release slide, whereby positive fluid pressure within the fluid chamber pushes the activating ring piston against the activating release slide which in turn releases the retaining clip from the needle holding member.
Claim 16
Dependent Claim
15 words
The needle retraction mechanism of claim 12 wherein the spring is a conical helical spring.
Claim 17
Dependent Claim
15 words
The needle retraction mechanism of claim 13 wherein the spring is a conical helical spring.
Claim 18
Dependent Claim
18 words
The needle retraction mechanism of claim 14 wherein the twin conical helical spring includes a spring separation member.
Claim 19
Dependent Claim
19 words
The needle retraction mechanism of claim 12 wherein the spring is received between a pair of spring retaining cups.
Claim 20
Dependent Claim
20 words
The needle retraction mechanism of claim 16 wherein both spring retaining cups are integrally formed with the needle holding member.
Claim 21
Dependent Claim
33 words
The retraction mechanism of claim 12 wherein a plurality of activation members are equidistantly spaced around the needle holding member moulded on a ring, the activation member cooperating with a corresponding retaining member.
Claim 22
Dependent Claim
22 words
The needle retraction mechanism of claim 18 wherein a slide member is located between each activation member and each corresponding retaining member.
Claim 23
Dependent Claim
31 words
A needle retraction mechanism of claim 15 wherein the twin conical spring and the spring separation member cooperate to deflect the hollow needle from axial alignment when in the post-use position.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2008-03-07 | 2008-09-06 | 2009-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-03-07 | 2012-09-06 | 2013-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-03-07 | 2016-09-06 | 2017-03-08 | $7700.00 | Window Closed / Lapsed |