Patent US4931043A successfully refreshed from Google Patents.
US4931043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ratchet connector for hypodermic syringe pistons
Assignee: Abbott Laboratories
•
Filing: 1988-08-08
•
Granted: 1990-06-05
•
Expires: 2008-08-08
Abstract
Abstract A connector for attachment of a plunger to a rubber piston in hypodermic syringe cartridge ampoules comprises a pin having a shank portion with a contiguous screw-threaded post portion and a ratchet head portion sized to rotatably fit within a cavity in said piston which thus prevents overtightening the plunger to the piston thereby obviating jamming of the piston in the bore of the cartridge.
Inventors
- 👤 Jefferson L. Ray
- 👤 Michael E. Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:54
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/315; A61M5/31511; A61M5/31515
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
96 words
A device for use in a hypodermic injection system which comprises in combination a slidable piston with a hollow recess therein and connector means for attaching a plunger to said piston, said connector means comprising a pin, said pin being disposed within said hollow recess of said piston, said pin having a cylindrical shank portion, a ratchet head portion on one end thereof of larger overall diameter than said shank portion and a screw-threaded post portion on the other end thereof wherein said ratchet head portion has a plurality of ratchet teeth arranged around its periphery.
Claim 2
Independent Claim
96 words
A device for use in a hypodermic injection system which comprises in combination a slidable piston with a hollow recess therein and connector means for attaching a plunger to said piston, said connector means comprising a pin, said pin being disposed within said hollow recess of said piston, said pin having a cylindrical shank portion, a ratchet head portion on one end thereof of larger overall diameter than said shank portion and a screw-threaded post portion on the other end thereof wherein said ratchet head portion has a plurality of ratchet teeth arranged around its periphery.
Claim 3
Dependent Claim
21 words
A device according to claim 1 wherein the shank portion of said pin has a shoulder adjacent said screw-threaded post portion.
Claim 4
Dependent Claim
25 words
A device according to claim 2 wherein said shoulder comprises a flared portion on the end of said shank portion adjacent said screw-threaded post portion.
Claim 5
Dependent Claim
20 words
A device according to claim 1 wherein the ratchet head portion of said pin is equipped with four ratchet teeth.
Claim 6
Independent Claim
106 words
A device for use in a hypodermic injection system which comprises in combination a hollow cylindrical cartridge ampoule, a flexible piston slidable in the bore thereof and connector means for attaching a plunger to said slidable piston, said piston having a hollow recess therein, said connector means comprising a pin being disposed within said hollow recess of said piston and having a cylindrical shank portion, a ratchet head portion on one end thereof of larger overall diameter than said shank portion and a screw-threaded post portion on the other end thereof wherein said ratchet head portion has a plurality of ratchet teeth arranged around its periphery.
Claim 7
Independent Claim
106 words
A device for use in a hypodermic injection system which comprises in combination a hollow cylindrical cartridge ampoule, a flexible piston slidable in the bore thereof and connector means for attaching a plunger to said slidable piston, said piston having a hollow recess therein, said connector means comprising a pin being disposed within said hollow recess of said piston and having a cylindrical shank portion, a ratchet head portion on one end thereof of larger overall diameter than said shank portion and a screw-threaded post portion on the other end thereof wherein said ratchet head portion has a plurality of ratchet teeth arranged around its periphery.
Claim 8
Dependent Claim
21 words
A device according to claim 5 wherein the shank portion of said pin has a shoulder adjacent said screw-threaded post portion.
Claim 9
Dependent Claim
25 words
A device according to claim 6 wherein said shoulder comprises a flared portion on the end of said shank portion adjacent said screw-threaded post portion.
Claim 10
Dependent Claim
19 words
A device according to claim 5 wherein the head portion of said pin is equipped with four ratchet teeth.
References Cited (Backward Citations)
US1395592A
Cited
US2524367A
Cited
US3224445A
Cited
US3259130A
Cited
US3253625A
Cited
US3273443A
Cited
US3584667A
Cited
US3555491A
Cited
US4125051A
Cited
US4293256A
Cited
EP0128039A2
Cited
US4759750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |