US3924700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blood withdrawing device
Assignee: LIFELINE INSTRUMENTS Inc
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Filing: 1974-11-29
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Granted: 1975-12-09
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Expires: 1994-11-29
Abstract
Abstract A blood withdrawing device for use in measuring blood withdrawn from a donor includes a frame on which is mounted a weight responsive device. In one form there is a balance beam fulcrumed on the frame and carrying a suspended tray for supporting a blood container having a supply tube under control of a pinch valve on the frame. The balance beam is continually balanced by a movable weight on the balance arm, the weight being advanced and retracted by an electric motor under control of a counter so that when a predetermined weight of blood is in the container the pinch valve is automatically actuated to stop the blood flow. During filling of the container the tray is mechanically agitated so as to intermix the incoming blood with an anticoagulant in the container. The agitation or shaking is periodically interrupted as the blood flows in and is terminated shortly before the final weighing, then reinitiated upon completion of total draw.
Inventors
- 👤 Homer M Lindsey
- 👤 Wilbert D Silva
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:02
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/15; A61B5/150007; A61B5/150015; A61B5/15003; A61B5/150206; A61B5/150221; A61B5/150366; A61B5/153; A61M; A61M1/00; A61M1/02; A61M1/024; A61M1/0245; G; G01; G01G; G01G13/00; G01G13/24; G01G13/28; G01G13/29; G01G13/2906; Y; Y10; Y10S; Y10S128/00; Y10S128/13; Y10S604/00; Y10S604/903
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
130 words
A blood withdrawing device comprising: a. a frame; b. a load measuring device on said frame, said load measuring device being a balance beam; c. a tray adapted to support a container having a supply tube; d. means for connecting said tray to transmit a load thereon to said load measuring device; e. means on said frame for controlling the flow of blood through said tube; and, f. means actuated by said load measuring device for operating said controlling means including: a weight mounted for movement along said balance beam, a motor for moving said weight long said balance beam, means for effectuating a number of counts in accordance with said movement, means for accumulating said counts, and, means effective at a predetermined number of counts for disabling said motor.
Claim 2
Dependent Claim
130 words
A blood withdrawing device comprising: a. a frame; b. a load measuring device on said frame, said load measuring device being a balance beam; c. a tray adapted to support a container having a supply tube; d. means for connecting said tray to transmit a load thereon to said load measuring device; e. means on said frame for controlling the flow of blood through said tube; and, f. means actuated by said load measuring device for operating said controlling means including: a weight mounted for movement along said balance beam, a motor for moving said weight long said balance beam, means for effectuating a number of counts in accordance with said movement, means for accumulating said counts, and, means effective at a predetermined number of counts for disabling said motor.
Claim 3
Dependent Claim
13 words
A device as in claim 1 including means for changing said predetermined number.
Claim 4
Dependent Claim
34 words
A device as in claim 1 including means for mounting said tray on said balance beam for agitation relative thereto, and means on said frame for agitating said tray relative to said balance beam.
Claim 5
Dependent Claim
85 words
A blood withdrawing device comprising: a. a frame; b. a load measuring device on said frame, said load measuring device being an electrically responsive pressure device; c. a tray adapted to support a container having a supply tube; d. means for connecting said tray to transmit a load thereon to said electrically responsive pressure device; e. means on said frame for controlling the flow of blood through said supply tube; and, f. means actuated by said electrically responsive pressure device for operating said controlling means.
Claim 6
Dependent Claim
85 words
A blood withdrawing device comprising: a. a frame; b. a load measuring device on said frame, said load measuring device being an electrically responsive pressure device; c. a tray adapted to support a container having a supply tube; d. means for connecting said tray to transmit a load thereon to said electrically responsive pressure device; e. means on said frame for controlling the flow of blood through said supply tube; and, f. means actuated by said electrically responsive pressure device for operating said controlling means.
Claim 7
Dependent Claim
78 words
A device as in claim 4 in which said electrically responsive pressure device includes a weight sensor conditioned by said load on said tray, said weight sensor being capable of converting said load into an electrical current analog; means for converting said electrical current analog into equivalent counting pulses; means for accumulating said counts; a solenoid actuated pinch valve connected to said supply tube; and means effective at a predetermined number of counts to close said pinch valve.
Claim 8
Dependent Claim
125 words
A blood withdrawing device comprising: a. a frame; b. a load measuring device on said frame; c. a tray adapted to support a container having a supply tube; d. means for connecting said tray to transmit a load thereon to said load measuring device; e. means on said frame for controlling the flow of blood through said supply tube; f. means actuated by said load measuring device for operating said controlling means; g. means for mounting said tray on said load measuring device for agitation relative thereto; h. means on said frame for agitating said tray relative to said load measuring device; and i. means for interrupting the operation of said agitating means at predetermined intervals to provide readings of said load in static condition.
Claim 9
Dependent Claim
125 words
A blood withdrawing device comprising: a. a frame; b. a load measuring device on said frame; c. a tray adapted to support a container having a supply tube; d. means for connecting said tray to transmit a load thereon to said load measuring device; e. means on said frame for controlling the flow of blood through said supply tube; f. means actuated by said load measuring device for operating said controlling means; g. means for mounting said tray on said load measuring device for agitation relative thereto; h. means on said frame for agitating said tray relative to said load measuring device; and i. means for interrupting the operation of said agitating means at predetermined intervals to provide readings of said load in static condition.
Claim 10
Dependent Claim
25 words
A device as in claim 6 in which said interrupting means is operable during the loading of said tray and at termination of blood flow.
Claim 11
Dependent Claim
19 words
A device as in claim 7 including means actuated by said load measuring device for operating said controlling means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |