| CPC A61M 1/3655 (2013.01) [A61M 1/3663 (2013.01); A61M 1/3673 (2014.02)] | 19 Claims |

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1. Apparatus for shunting blood, the apparatus comprising:
a flow-indication chamber shaped to define an entry port and an exit port; and
one or more beads, at least one of which comprises multiple faces, disposed within the flow-indication chamber and configured to move in response to a flowing of the blood from the entry port to the exit port,
at least a portion of a wall of the flow-indication chamber being transparent so as to expose the one or more beads to sight.
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