US4687467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
One-time use medical syringe invention
Assignee: C T F Research Co
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Filing: 1986-06-11
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Granted: 1987-08-18
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Expires: 2006-06-11
Abstract
Abstract Medical care device for only one-time use as a medical syringe for injection with destroyable piston after single use. Destruction of a syringe piston will occur after one-time use by cutting out a hole in the center of the front wall of the piston. In the very last moment of the injection stroke, the piston is pushed against the very sharp cylindrical cutting edge of the rear end of the tubular needle, which protrudes to the inside of the syringe cylinder for this purpose. With such a punctured piston it will be impossible to create a vacuum suction effect which is necessary to introduce any medication or liquid into the syringe cylinder for a second use. Simply put, nobody will be able to use this kind of syringe twice.
Inventors
- 👤 Bozena Cygielski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:26
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/50; A61M5/508
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
175 words
A medical injection syringe comprising: a cylinder having an open end and a closed end and a cutting edge protruding into the interior of the cylinder at the closed end; a hollow needle mounted in the closed end of the cylinder in communication with the interior of the cylinder; a piston adapted to fit in the interior of the cylinder through the open end thereof and in sealing engagement with the cylinder for forcing fluid through the needle as the piston is pushed towards the closed end of the cylinder, the piston having a piston surface facing the cutting edge as the piston approaches the closed end of the cylinder; means surrounding the cutting edge for protecting the piston surface from being cut when the piston approaches the closed end of the cylinder; and pushing means for forcing the piston toward the closed end of the cylinder so as to force the fluid out the needle and such that when the piston engages the cutting edge, an opening hole is cut in the piston surface.
Claim 2
Dependent Claim
175 words
A medical injection syringe comprising: a cylinder having an open end and a closed end and a cutting edge protruding into the interior of the cylinder at the closed end; a hollow needle mounted in the closed end of the cylinder in communication with the interior of the cylinder; a piston adapted to fit in the interior of the cylinder through the open end thereof and in sealing engagement with the cylinder for forcing fluid through the needle as the piston is pushed towards the closed end of the cylinder, the piston having a piston surface facing the cutting edge as the piston approaches the closed end of the cylinder; means surrounding the cutting edge for protecting the piston surface from being cut when the piston approaches the closed end of the cylinder; and pushing means for forcing the piston toward the closed end of the cylinder so as to force the fluid out the needle and such that when the piston engages the cutting edge, an opening hole is cut in the piston surface.
Claim 3
Dependent Claim
28 words
The syringe as set forth in claim 1 wherein the cutting edge is formed on the needle at an end in communication with the interior of the cylinder.
Claim 4
Dependent Claim
53 words
The syringe as set forth in claim 1 wherein the piston is made of silicone rubber and the pushing means includes a support surface behind the piston surface as the piston nears the closed end of the cylinder so that the piston surface is supported when the cutting edge cuts an opening hole.
Claim 5
Dependent Claim
44 words
The syringe as set forth in claim 3 wherein the protecting means has a circularly shaped opening into which the cutting edge can protrude and the cutting edge is cylindrically shaped such that the opening hole cut in the piston surface is substantially circular.
Claim 6
Dependent Claim
17 words
The syringe as set forth in claim 4 wherein the support surface includes a disc shaped member.
Claim 7
Dependent Claim
56 words
The syringe as set forth in claim 1 wherein the pushing means has an opening extending from a side near the piston to an outlet side toward the open end of the cylinder such that when the opening hole is cut air easily passes freely from the closed end of the cylinder to the open end.
Claim 8
Dependent Claim
28 words
The syringe as set forth in claim 6 wherein the cutting edge is cylindrically shaped and the opening is cylindrically shaped smaller in diameter than the cutting edge.
Claim 9
Dependent Claim
166 words
A medical injection syringe comprising: a cylinder having an open end and a closed end and a cutting edge protruding into the interior of the cylinder at the closed end; a hollow needle mounted in the closed end of the cylinder in communication with the interior of the cylinder; a piston adapted to fit in the interior of the cylinder through the open end thereof and in sealing engagement with the cylinder for forcing fluid through the needle as the piston is pushed towards the closed end of the cylinder, the piston having a cavity formed in the piston surface facing the cutting edge into which the cutting edge protrudes as the piston approaches the closed end of the cylinder; and pushing means for forcing the piston toward the closed end of the cylinder so as to force the fluid out the needle and such that when the piston engages the cutting edge, an opening hole is cut in the piston within the cavity formed therein.
Claim 10
Dependent Claim
166 words
A medical injection syringe comprising: a cylinder having an open end and a closed end and a cutting edge protruding into the interior of the cylinder at the closed end; a hollow needle mounted in the closed end of the cylinder in communication with the interior of the cylinder; a piston adapted to fit in the interior of the cylinder through the open end thereof and in sealing engagement with the cylinder for forcing fluid through the needle as the piston is pushed towards the closed end of the cylinder, the piston having a cavity formed in the piston surface facing the cutting edge into which the cutting edge protrudes as the piston approaches the closed end of the cylinder; and pushing means for forcing the piston toward the closed end of the cylinder so as to force the fluid out the needle and such that when the piston engages the cutting edge, an opening hole is cut in the piston within the cavity formed therein.
Claim 11
Dependent Claim
28 words
The syringe as set forth in claim 8 wherein the cutting edge is formed on the needle at an end in communication with the interior of the cylinder.
Claim 12
Dependent Claim
51 words
The syringe as set forth in claim 8 wherein the piston is made of silicone rubber and the pushing means includes a support surface behind the cavity as the piston nears the closed end of the cylinder so that the cavity is supported when the cutting edge cuts an opening hole.
Claim 13
Dependent Claim
33 words
The syringe as set forth in claim 10 wherein the cavity is cylindrically shaped and the cutting edge is cylindrically shaped such that the opening hole cut in the cavity is substantially circular.
Claim 14
Dependent Claim
17 words
The syringe as set forth in claim 11 wherein the support surface includes a disc shaped member.
Claim 15
Dependent Claim
56 words
The syringe as set forth in claim 8 wherein the pushing means has an opening extending from a side near the piston to an outlet side toward the open end of the cylinder such that when the opening hole is cut air easily passes freely from the closed end of the cylinder to the open end.
Claim 16
Dependent Claim
28 words
The syringe as set forth in claim 13 wherein the cutting edge is cylindrically shaped and the opening is cylindrically shaped smaller in diameter than the cutting edge.
References Cited (Backward Citations)
FR2298340A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |