US3557784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Syringe
Assignee: Individual
•
Filing: 1968-12-24
•
Granted: 1971-01-26
•
Expires: 1988-12-24
Abstract
Abstract A syringe comprising a barrel carrying a cartridge containing a liquid medicament and closed at one end by a penetrable closure and the opposite end provided with a plunger slidable in the cartridge. A piercing member is slidable mounted on the barrel to pierce the penetrable closure and permit the discharge of the liquid medicament upon pushing the plunger into the cartridge. The plunger of the cartridge is pushed into the cartridge by spring actuated mechanism mounted in the barrel contiguous to the cartridge plunger and retained in compressed condition by latch members of resilient material and actuated into and out of engagement with the spring actuated mechanism by a pair of manipulating members slidable over the latch members and removable from the latch members and the barrel for the removal of the spring actuated mechanism and the replacement of a spent cartridge.
Inventors
- 👤 Walter A Shields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:12
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
A syringe comprising a barrel, a cartridge containing a liquid medicament and provided with a penetrable closure in one end projecting from one end of the barrel and a plunger in the other end of the cartridge, spring actuated mechanism removably mounted in the barrel contiguous to the plunger of the cartridge, latch members mounted on an intermediate portion of the barrel and arranged to retain the spring actuated mechanism in the barrel and adapted to be actuated to release the spring actuated mechanism to move the plunger of the cartridge toward the penetrable closure, and a penetrating member slidably mounted on the end portion of the barrel arranged with the penetrable closure and actuated to pierce said penetrable closure prior to the actuation of the latch members.
Claim 2
Dependent Claim
128 words
A syringe comprising a barrel, a cartridge containing a liquid medicament and provided with a penetrable closure in one end projecting from one end of the barrel and a plunger in the other end of the cartridge, spring actuated mechanism removably mounted in the barrel contiguous to the plunger of the cartridge, latch members mounted on an intermediate portion of the barrel and arranged to retain the spring actuated mechanism in the barrel and adapted to be actuated to release the spring actuated mechanism to move the plunger of the cartridge toward the penetrable closure, and a penetrating member slidably mounted on the end portion of the barrel arranged with the penetrable closure and actuated to pierce said penetrable closure prior to the actuation of the latch members.
Claim 3
Dependent Claim
52 words
A syringe as claimed in claim 1, wherein the barrel is provided with an open end to assemble the cartridge and the spring actuated mechanism in said barrel with the opposite end having a center opening smaller than the inner diameter of the barrel for projecting the penetrable closure of the cartridge.
Claim 4
Dependent Claim
42 words
A syringe as claimed in claim 1, wherein the spring actuated mechanism comprises a piston slidable in the barrel, a plunger slidable in the barrel with a portion extended from the barrel, and a spring compressed between the piston and the plunger.
Claim 5
Dependent Claim
48 words
A syringe as claimed in claim 3, wherein the latch members comprise two pairs of latches of resilient material supported on the barrel, the first pair of lAtches having lateral end portions extended into the barrel to engage and space the piston from the plunger of the cartridge.
Claim 6
Dependent Claim
50 words
A syringe as claimed in claim 4, wherein the second pair of latches is provided with lateral portions positioned beyond the open end of the barrel to engage the extended portion of the plunger of the spring actuated mechanism and retain the plunger in a predetermined position in the barrel.
Claim 7
Dependent Claim
38 words
A syringe as claimed in claim 5, wherein the lateral end portions of the first pair of latches extend toward each other and the lateral end portions of the second pair of latches extend away from each other.
Claim 8
Dependent Claim
38 words
A syringe as claimed in claim 5, wherein the extended portion of the plunger of the spring actuated mechanism is provided with a manipulating knob having an annular ridge to be engaged by the second pair of latches.
Claim 9
Dependent Claim
76 words
A syringe as claimed in claim 3, wherein the latch members comprises two pairs of latches of resilient material mounted on a pair of opposed pivots on the barrel, each pivot supporting a latch of each pair, a pair of annular members, each member slidable on a different pair of latches to actuate the free ends of the latches into and out of latching engagement with the piston and the plunger of the spring actuated mechanism.
Claim 10
Dependent Claim
22 words
A syringe as claimed in claim 8, wherein each annular member is provided with an annular flange to form a manipulating portion.
Claim 11
Dependent Claim
27 words
A syringe as claimed in claim 8, wherein each annular member is arranged with diametrically opposed notches for sliding said annular members on and off the latches.
Claim 12
Dependent Claim
48 words
A syringe as claimed in claim 1, wherein the penetrating member comprises a cap member releasably mounted on the barrel and a piercing spike secured in the bottom of the cap member to pierce the penetrable closure of the cartridge upon moving the cap member onto the barrel.
References Cited (Backward Citations)
US2650591A
Cited
US2667874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |