US4407659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive system
Assignee: Varian Techtron Pty Ltd
•
Filing: 1981-06-05
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Granted: 1983-10-04
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Expires: 2001-06-05
Abstract
Abstract A syringe drive system having a structure for supporting the body of a syringe in a particular disposition and retaining the syringe body against axial movement. A drive motor is secured to the structure so as to have a drive shaft thereof in alignment with the syringe body. The drive shaft is arranged to move axially in response to energization of the motor and is connected to the plunger stem of the syringe through a coupling which is slideably mounted on the support structure. The arrangement is such that energization of the motor causes movement of the coupling block in the axial direction of the syringe and the syringe plunger is depressed or withdrawn accordingly.
Inventors
- 👤 Leslie E. S. Adam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:58
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0217; B01L3/0227
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A syringe drive system including, a support structure, means on said support structure for receiving and holding a syringe against axial movement, a drive motor having a body and a drive shaft which moves axially relative to said body in response to energization of said motor, said drive motor body being secured to said support structure against movement relative thereto and so that said drive shaft is substantially coaxially with a said syringe secured to said support structure, coupling means connected directly to an end of said drive shaft for movement therewith relative to said support structure, said coupling means being directly connectable to the plunger of a said syringe to cause axial movement thereof in response to said axial movement of the drive shaft, and means holding said shaft against rotation relative to said support structure.
Claim 2
Dependent Claim
137 words
A syringe drive system including, a support structure, means on said support structure for receiving and holding a syringe against axial movement, a drive motor having a body and a drive shaft which moves axially relative to said body in response to energization of said motor, said drive motor body being secured to said support structure against movement relative thereto and so that said drive shaft is substantially coaxially with a said syringe secured to said support structure, coupling means connected directly to an end of said drive shaft for movement therewith relative to said support structure, said coupling means being directly connectable to the plunger of a said syringe to cause axial movement thereof in response to said axial movement of the drive shaft, and means holding said shaft against rotation relative to said support structure.
Claim 3
Dependent Claim
24 words
A syringe drive system according to claim 1, wherein said drive motor is a digital linear actuator which is energized by a pulsed signal.
Claim 4
Dependent Claim
66 words
A syringe drive system according to claim 1, wherein said support means includes a base, said coupling means includes a block slideably mounted on said base, said block being secured to said drive shaft for movement therewith in an axial direction of the shaft and having a recess therein for receiving an enlarged part of the syringe plunger which is located externally of the syringe body.
Claim 5
Dependent Claim
41 words
A syringe drive system according to claim 3, wherein said coupling block co-operates with guide means on said base so as to be held to a straight path of movement which is substantially parallel to the longitudinal axis of said plunger.
Claim 6
Dependent Claim
35 words
A syringe drive system according to claim 1, wherein an optical switch is connected to said support means and is operative to de-energize said drive motor when said plunger is withdrawn beyond a predetermined position.
Claim 7
Dependent Claim
64 words
A syringe drive system according to claim 5, wherein said optical switch includes a light source and a receiver located on respective opposite sides of said coupling block, and a member connected to said block is arranged to prevent light from said light source impinging on said receiver when said coupling block is at a position corresponding to said predetermined position of the plunger.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |