US4818186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive mechanism for disposable fluid infusion pumping cassette
Assignee: Hospira Inc
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Filing: 1987-05-01
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Granted: 1989-04-04
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Expires: 2007-05-01
Abstract
Abstract A driver for use in an infusion pumping cassette having an elongated valve actuator which operates a valve controlling the flow of fluid through the cassette, a bracket having a first arm pivotally secured to one end of the valve actuator and a second arm, a cam driveably engaging the second arm, a motor which drives the cam and a positioner which monitors the rotational position of the cam.
Inventors
- 👤 John Pastrone
- 👤 Leland D. Chamness
- 👤 George H. Fellingham
- 👤 Walter L. Jimison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:33
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/36; A61M5/365; A61M5/14; A61M5/142; A61M5/14212; A61M5/14224; A61M2205/00; A61M2205/12; A61M2205/128
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
100 words
A driver for driving a fluid pumping cassette having valve means for controlling the flow of fluid through the fluid pumping cassette, driven by actuators associated with said driver, comprising: a. an elongated valve actuator to operate valve means on the cassette; b. a bracket pivotally mounted on said driver, said bracket having two arms, a first arm being pivotally secured to one end of said valve actuator; c. cam means driveably engaging the second arm of said bracket; d. motor means to drive said cam means; and e. positioning means to monitor the rotational position of said cam means.
Claim 2
Dependent Claim
100 words
A driver for driving a fluid pumping cassette having valve means for controlling the flow of fluid through the fluid pumping cassette, driven by actuators associated with said driver, comprising: a. an elongated valve actuator to operate valve means on the cassette; b. a bracket pivotally mounted on said driver, said bracket having two arms, a first arm being pivotally secured to one end of said valve actuator; c. cam means driveably engaging the second arm of said bracket; d. motor means to drive said cam means; and e. positioning means to monitor the rotational position of said cam means.
Claim 3
Dependent Claim
45 words
The driver as recited in claim 1 wherein said positioning means includes a flag attached to said cam means and moveable therewith; and detecting means for detecting the position of said flag and thus determining whether the valve actuator means are in a predefined position.
Claim 4
Dependent Claim
58 words
The driver as recited in claim 2 wherein said detecting means includes an optical switch adjacent said flag, and a notch on said flag, whereby the position of said flag can be determined by said optical switch detecting the location of said notch, said optical switch producing a signal indicative of the position of the valve actuator means.
Claim 5
Dependent Claim
28 words
The driver as recited in claim 1 which comprise two pivotal brackets and two valve actuators, said second arms of said brackets driveably engaging a common cam means.
Claim 6
Dependent Claim
21 words
The driver as recited in claim 4 wherein said cam means is positioned between said second arms of said two brackets.
Claim 7
Dependent Claim
25 words
The driver as recited in claim 5 further including biasing means to bias said two second arms toward each other to engage said cam means.
Claim 8
Dependent Claim
32 words
The driver as recited in claim 4 wherein one of said first arms is offset relative to the other so that said two valve actuators are in different horizontal and vertical planes.
Claim 9
Dependent Claim
64 words
The driver as recited in claim 4 further including first biasing means to bias said two second arms toward each other and toward said cam means, said cam means being positioned between said two second arms; and second biasing means for urging at least one of said two second arms away from the other in the event of failure of said first biasing means.
Claim 10
Dependent Claim
35 words
The driver as recited in claim 8 further including location detection means to detect the position of said one second arm when said second biasing means urges said two second arms away from each other.
Claim 11
Dependent Claim
30 words
The driver as recited in claim 9 wherein said location detection means comprises an optical switch that controls an alarm to alert an operator if the first biasing means fail.
Claim 12
Dependent Claim
20 words
The driver as recited in claim 4 wherein one of said brackets is at least partially disposed within the other.
Claim 13
Dependent Claim
22 words
The driver as recited in claim 11 wherein said two brackets are pivotally mounted on said driver about the same pivot point.
Claim 14
Dependent Claim
21 words
The driver as recited in claim 11 wherein said two brackets are pivotally mounted on said driver about separate pivot points.
Claim 15
Dependent Claim
124 words
A driver for driving a fluid pumping cassette having valve means for controlling the flow of fluid through the fluid pumping cassette, driven by actuators associated with said driver, comprising a valve actuator assembly including a. a pair of brackets pivotally mounted on said driver, each bracket having two arms; b. a pair of elongated valve actuator means, each valve actuator means being pivotally mounted on the first arm of one of said brackets; c. cam means driveably engaging the second arm of each of said brackets; d. motor means for driving said cam means; and e. synchronizing means for monitoring the rotational position of the cam means and controlling the motor means to synchronize the valve actuator means with a fluid pumping driver.
Claim 16
Dependent Claim
124 words
A driver for driving a fluid pumping cassette having valve means for controlling the flow of fluid through the fluid pumping cassette, driven by actuators associated with said driver, comprising a valve actuator assembly including a. a pair of brackets pivotally mounted on said driver, each bracket having two arms; b. a pair of elongated valve actuator means, each valve actuator means being pivotally mounted on the first arm of one of said brackets; c. cam means driveably engaging the second arm of each of said brackets; d. motor means for driving said cam means; and e. synchronizing means for monitoring the rotational position of the cam means and controlling the motor means to synchronize the valve actuator means with a fluid pumping driver.
Claim 17
Dependent Claim
16 words
The driver as recited in claim 14 including at least two of said valve actuator assemblies.
Claim 18
Dependent Claim
21 words
The driver as recited in claim 14 wherein said cam means comprises a common cam positioned between said two second arms.
Claim 19
Dependent Claim
21 words
The driver as recited in claim 16 wherein said synchronizing means include positioning means for detecting the position of said cam.
Claim 20
Dependent Claim
41 words
The driver as recited in claim 17 wherein said positioning means includes a flag mounted on said cam means and detection means for detecting the position of said flag to determine whether the valve actuator means are in a predefined position.
Claim 21
Dependent Claim
41 words
The driver as recited in claim 18 wherein said detection means includes a notch on said flag and an optical switch for detecting the position of said notch and producing a signal indicative of the position of the valve actuator means.
Claim 22
Dependent Claim
15 words
The driver as recited in claim 19 wherein said motor means is a stepping motor.
Claim 23
Dependent Claim
21 words
The driver as recited in claim 16 further including first biasing means for biasing said two second arms toward said cam.
Claim 24
Dependent Claim
51 words
The driver as recited in claim 21 further including second biasing means for urging at least one of said two second arms away from said cam means in the event of failure of said first biasing means; and means for detecting the position of said one second arm in such event.
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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) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |