Patent US3669104A successfully refreshed from Google Patents.
US3669104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Implant gun
Assignee: Pfizer Inc
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Filing: 1970-06-15
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Granted: 1972-06-13
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Expires: 1990-06-15
Abstract
Abstract Subcutaneous implant gun for dispensing pellets comprises case with hollow needle attached thereto. Plunger in alignment with hollow needle reciprocates to expell pellets through needle as pellets are positioned in path of plunger travel. Reciprocable bushing in alignment with hollow needle supportingly surrounds plunger. Trigger pivoted to case is connected to reciprocable bushing and plunger, and linkage system between trigger and bushing and plunger causes bushing and plunger to move in direction of hollow needle when trigger is depressed. Bushing and plunger move away from hollow needle when trigger is released.
Inventors
- 👤 James B Wyatt
- 👤 Peter D George
- 👤 Kenneth Van Dyck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:19
CPC Classifications
A; A61; A61M; A61M37/00; A61M37/0069
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
A subcutaneous implant gun for dispensing pellets comprising a case with a hollow needle attached thereto, a reciprocable plunger in alignment with the hollow needle for expelling pellets through the hollow needle as they are positioned in the path of plunger travel, a reciprocable bushing in alignment with the hollow needle supportingly surrounding the plunger, both the plunger and the bushing being reciprocable along a path in alignment with the hollow needle, a trigger pivoted to the case connected to reciprocate the bushing and the plunger, and a linkage system connected between the trigger and the bushing and plunger for causing the bushing and plunger to move in the direction of the hollow needle when the trigger is depressed and the plunger away from the hollow needle when the trigger is released.
Claim 2
Dependent Claim
132 words
A subcutaneous implant gun for dispensing pellets comprising a case with a hollow needle attached thereto, a reciprocable plunger in alignment with the hollow needle for expelling pellets through the hollow needle as they are positioned in the path of plunger travel, a reciprocable bushing in alignment with the hollow needle supportingly surrounding the plunger, both the plunger and the bushing being reciprocable along a path in alignment with the hollow needle, a trigger pivoted to the case connected to reciprocate the bushing and the plunger, and a linkage system connected between the trigger and the bushing and plunger for causing the bushing and plunger to move in the direction of the hollow needle when the trigger is depressed and the plunger away from the hollow needle when the trigger is released.
Claim 3
Dependent Claim
21 words
A subcutaneous implant gun as in claim 1 wherein the forward end of the bushing adjacent the hollow needle is chamfered.
Claim 4
Dependent Claim
140 words
A subcutaneous implant gun as in claim 1 wherein the linkage system includes a cam link pivotally connected to the case having a cam track thereon, a first connector link between the trigger and the cam link for rotating the cam link about its pivotal connection when the trigger is moved, a second connector link between the cam link and the plunger for reciprocating the plunger along its path of travel as the cam link rotates, a bell crank pivotally connected to the case, one end of the bell crank having a cam follower that engages the cam track on the cam link for rotating the bell crank as the cam link rotates, and means connecting the other end of the bell crank to the bushing for reciprocating the bushing along its path of travel as the bell crank rotates.
Claim 5
Dependent Claim
39 words
A subcutaneous implant gun as in claim 3 wherein the trigger is spring biased away from the case whereby when the trigger is released it moves outwardly from the case and withdraws the plunger away from the hollow needle.
Claim 6
Dependent Claim
31 words
A subcutaneous implant gun as in claim 1 including a cartridge holder positioned between the hollow needle and the bushing arranged to accommodate a cartridge containing a plurality of implant pellets.
Claim 7
Dependent Claim
48 words
A subcutaneous implant gun as in claim 1 wherein the case includes a pair of tracks that parallel the path of travel of the plunger, and pins connected to the plunger and positioned in the tracks for Supporting the plunger as it reciprocates along its path of travel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |