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US4620848A Expired / Lapsed US ⏱️ 0.0 years remaining

Powered infusion apparatus

Assignee: NATIONAL RESEARCH DEVELOPMENT Corp A BRITISH CORPORATION
•
Filing: 1985-09-17
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Granted: 1986-11-04
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Expires: 2005-09-17
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Abstract

Abstract Apparatus for powered infusion or sampling of a patient comprises: a housing (11) carrying a toothed roller (17), an electric motor (19), a transmission (20) operably coupling such roller and motor, and attachment means (14); and a syringe (12) including a barrel (13) and plunger (15), the plunger being of plastics material having a smooth untoothed longitudinal profile (16), and the attachment means holding the syringe by its barrel in a predetermined disposition relative to the housing with the plunger extending transversely relative to the toothed roller axis of rotation and such roller in penetrated driving engagement with said plunger profile; is provided with a further roller (23) carried by said housing and in transversely driven engagement with the syringe plunger; and a monitor (24) operably coupled with the further roller to generate electrical signals representing rotation of such roller and, in turn, plunger translation. The further roller can be toothed and in similar penetrated engagement with the plunger as the first toothed roller, and the two rollers can be mutually arranged coaxially across, serially along or in opposition about the plunger.

Inventors

  • 👤 Ian A. Sutherland
  • 👤 Geoffrey R. Chambers

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 23:34
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/145; A61M5/1452; A61M5/1456; Y; Y10; Y10S; Y10S128/00; Y10S128/12

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 121 words
Apparatus comprising: a housing carrying a toothed roller, an electric motor, a transmission operably coupling said motor to drive said toothed roller, a further roller, a monitor operably coupled with said further roller to generate electrical signals representing rotation of such roller and attachment means; and a syringe including a barrel and plunger; said plunger being of a plastics material having a smooth untoothed longitudinal profile, and said attachment means releasably holding said syringe by said barrel in a predetermined disposition relative to said housing with said plunger extending transversely to the axes of rotation of said rollers, with said toothed roller in penetrated driving engagement with said plunger profile, and with said further roller in driven engagement with said plunger.
Claim 2
Dependent Claim 121 words
Apparatus comprising: a housing carrying a toothed roller, an electric motor, a transmission operably coupling said motor to drive said toothed roller, a further roller, a monitor operably coupled with said further roller to generate electrical signals representing rotation of such roller and attachment means; and a syringe including a barrel and plunger; said plunger being of a plastics material having a smooth untoothed longitudinal profile, and said attachment means releasably holding said syringe by said barrel in a predetermined disposition relative to said housing with said plunger extending transversely to the axes of rotation of said rollers, with said toothed roller in penetrated driving engagement with said plunger profile, and with said further roller in driven engagement with said plunger.
Claim 3
Dependent Claim 25 words
Apparatus according to claim 1 wherein said further roller is toothed and in penetrated driven engagement with said plunger profile or a further such profile.
Claim 4
Dependent Claim 19 words
Apparatus according to claim 1 comprising a pressure-applying means locatable to engage said plunger in opposition to said rollers.
Claim 5
Dependent Claim 12 words
Apparatus according to claim 3 wherein said roller axes are mutually coaxial.
Claim 6
Dependent Claim 23 words
Apparatus according to claim 3 wherein said roller axes are mutually parallel and said rollers are positioned mutually serially relative to said plunger.
Claim 7
Dependent Claim 21 words
Apparatus according to claim 5 wherein said toothed and further rollers are positioned respectively nearer to and further from said barrel.
Claim 8
Dependent Claim 17 words
Apparatus according to claim 5 wherein said pressure-applying means is biassed in opposition to said toothed roller.
Claim 9
Dependent Claim 16 words
Apparatus according to claim 1 wherein said rollers are positioned in mutual opposition about said plunger.
Claim 10
Dependent Claim 51 words
Apparatus according to claim 8 wherein said rollers project axially outwardly from said housing in mutally parallel manner, and said plunger has at least one T-shape in cross-section of which the stem is engaged betweeen said rollers and the cross bar is located over the outer axial ends of said rollers.
Claim 11
Dependent Claim 22 words
Apparatus according to claim 9 comprising a cover releasably connectable with said housing to hold said plunger in engagement with said rollers.

References Cited (Backward Citations)

US3395704A Cited
US4090502A Cited
US4085747A Cited
US4300554A Cited
GB2077599A Cited
US4416662A Cited
US4465474A Cited
US4502488A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1989-11-03 1990-05-05 1990-11-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1993-11-03 1994-05-05 1994-11-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1997-11-03 1998-05-05 1998-11-04 $7700.00 Window Closed / Lapsed

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