Blood cradle

• US 5,147,330 A
• Filed: 10/16/1990
• Issued: 09/15/1992
• Est. Priority Date: 10/18/1989
• Status: Expired due to Fees

• Current Assignee: Ljungberg & Kögel AB
• Original Assignee: Ljungberg & Kogel
• Inventors: Kogel, Arne
• Primary Examiner(s): Hafer, Robert A.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/598,073
• Time in Patent Office: 700 Days
• Field of Search: 604/245, 604/250, 604/903, 604/403, 604/408-410, 177/118, 177/245
• US Class Current: 604/245
• CPC Class Codes: A61M 1/0245 combined with blood container shaking means
• CPC Class Codes: A61M 39/281 Automatic tube cut-off devices, e.g. squeezing tube on detection of air
• CPC Class Codes: Y10S 604/903 Medical container with material agitation means

Abstract

A cradle for use in blood donating processes comprises surface (2) which is intended to support a blood-collecting bag and to be rocked reciprocatingly on an axle (4) which extends perpendicularly to the surface, by means of a crank (5, 7). The cradle is provided with a weight measuring device (8) which functions to measure the quantity of blood that has flowed into the bag, and is also fitted with a clamping device (11) which functions to clamp-on or squeeze the hose such as to prevent blood from flowing therein and which is operable electromagnetically. The cradle is further provided with a control circuit (21) which is constructed to control at least the clamping device (11). The cradle is characterized in that the control circuit (21) is constructed so that, upon receipt of a given signal from the operator, it will cause the clamping device (11) to clamp-on the hose, and will cause the clamping device (11) to release the hose in response to a given start signal from the operator; and in that the control circuit (21 ) is constructed to cause the clamping device to alternately clamp-on the hose and release the hose in a manner such as to release a small quantity of blood at a time when a given, predetermined amount of blood remains to be taken from the donor; and in that the control circuit is constructed in a known manner to cause the clamping device to clamp-on the hose when a predetermined amount of blood has flowed into the blood bag.

Claims

1. A blood-collecting bag cradle comprising a bag carrier, with a support surface, adapted to support a blood-collecting bag, means including an axle connected to and extending under and essentially parallel with said surface, and a crank offset from and parallel with said axle and engaging said carrier for reciprocatingly rocking said carrier on said axle, said cradle also being provided with a weight measuring device connected to said carrier to measure the quantity of blood that has flowed into the bag, said cradle also being provided with a clamping device adapted to receive a part of a hose connected to the blood-collecting bag and operable to clamp and unclamp the hose to respectively prevent and permit flow of blood therethrough and electromagnetic power means to operate said clamping device, and said cradle including a control circuit means connected to said power means to control at least the clamping device, said control circuit means being so constructed and connected to said clamping device so that, upon receipt of a first signal from an operator, the control circuit means will operate the power means for said clamping device to clamp the hose, and, in response to a second, start, signal from an operator, will operate the power means for said clamping device to unclamp said hose;

and wherein said control circuit means includes first control means responsive to said weight measuring device to operate the clamping device to alternately positively clamp the hose and to unclamp said hose, by operating said electromagnetic power means, so as to permit passage of a small quantity of blood at a time through said hose when a given amount of blood remains to be taken from the donor; and

wherein the control circuit means has additional means also responsive to said weight measuring device to operate said power means to cause the clamping device to clamp the hose when a predetermined total amount of blood has flowed into the blood-collecting bag.

2. A blood-collecting bag cradle according to claim 1, wherein the first means in said control circuit means responsive to said weight measuring device senses when all but 5-25 ml. of the predetermined total amount of blood has been taken and actuates said power means for said control circuit means to cause said clamping device to alternately clamp the hose and unclamp the hose, to slow down the flow of blood.

3. A blood-collecting bag cradle according to claim 1, wherein said additional means responsive to said weight measuring device will supplementarily actuate said control circuit means, subsequent to having caused the clamping device to clamp the hose when the predetermined total amount of blood has been obtained, to again operate said clamping device to unclamp the hose and then to immediately again clamp the hose, thereby to allow a small amount of blood to pass through the hose into the bag.