Patent US3941129A successfully refreshed from Google Patents.
US3941129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quantity indicating injection device
Assignee: KORB IDA MAY
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Filing: 1974-12-10
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Granted: 1976-03-02
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Expires: 1994-12-10
Abstract
Abstract A cartridge or injecting device for storing and dispensing medical solutions, such cartridge being characterized by a tubular member with a needle on one end having an opening therethrough communicating with the interior of the tubular member. A slidable drive stopper in the other end of the tubular member has thereon an elongated plunger for advancing and retracting the drive stopper. A non-retractable stopper in the tubular member, in contact with the forward end of the drive stopper, has therethrough a longitudinal opening. The non-retractable stopper is therefore shifted forwardly when the drive stopper is advanced thus serving as a visual indicator showing that medical solution has been ejected from the cartridge.
Inventors
- 👤 Ida M. Pleznac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:29
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/28; A61M2205/00; A61M2205/58; A61M2205/583
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
197 words
An injecting device for medical solutions comprising a sealed cylindrical tubular medicament receiving and dispensing barrel member having indicia means thereon and including a needle means on one end and an acutating means on the other end, said actuating means having a sliding fluid tight drive piston thereon and received in the inside of said barrel member and positioned adjacent said other end, a medicament cavity in said barrel extending from said one barrel end toward said other end of said barrel, a means for indicating the quantity of medicament in said barrel cavity comprising a snug fitting plunger means also slidingly received in said barrel means with one end abutting but unattached to said piston and the other end facing said medicament cavity, said snug fitting plunger means having at least one longitudinally extending fluid by pass hole therethrough and defining a non-retractable plunger stopper whereby pressure by the piston on said non-retractable plunger aspirates residual medicament in said cavity and the non-retractable plunger stopper will remain in a fixed position in the barrel so that the indicia will indicate the position of the plunger and residual quantity of medicament is remaining in the barrel cavity.
Claim 2
Dependent Claim
197 words
An injecting device for medical solutions comprising a sealed cylindrical tubular medicament receiving and dispensing barrel member having indicia means thereon and including a needle means on one end and an acutating means on the other end, said actuating means having a sliding fluid tight drive piston thereon and received in the inside of said barrel member and positioned adjacent said other end, a medicament cavity in said barrel extending from said one barrel end toward said other end of said barrel, a means for indicating the quantity of medicament in said barrel cavity comprising a snug fitting plunger means also slidingly received in said barrel means with one end abutting but unattached to said piston and the other end facing said medicament cavity, said snug fitting plunger means having at least one longitudinally extending fluid by pass hole therethrough and defining a non-retractable plunger stopper whereby pressure by the piston on said non-retractable plunger aspirates residual medicament in said cavity and the non-retractable plunger stopper will remain in a fixed position in the barrel so that the indicia will indicate the position of the plunger and residual quantity of medicament is remaining in the barrel cavity.
Claim 3
Dependent Claim
41 words
The injecting device of claim 1 wherein the tubular barrel is a cartridge and is received in a dispensing holder and the said actuating means is a threaded stud for detachable connection to a movable operator disc on the dispensing holder.
Claim 4
Dependent Claim
29 words
The device of claim 1 wherein the said at least one by pass hole is located away from the center of said plunger and comprises several spaced longitudinally holes.
Claim 5
Dependent Claim
22 words
The injecting device for medical solutions described in claim 1 in which the piston plunger is detachably connected to the actuating means.
Claim 6
Dependent Claim
77 words
The injecting device for medical solutions described in claim 1 having in addition thereto: a reservoir in the non-retractable plunger having a discharge opening in sealing engagement with the forward end of the drive piston, and a non-toxic dye in the reservoir which escapes and discolors the medical solution that is drawn into the space between the two stoppers through the longitudinal opening in the non-retractable plunger when the drive piston is retracted by the actuating means.
References Cited (Backward Citations)
US2665687A
Cited
US2591706A
Cited
GB918100A
Cited
US3259130A
Cited
US3359979A
Cited
US3248014A
Cited
US3618603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |