Bellows pump for blood transfusions

Claim 1

A BELLOWS PUMP OF THE CLASS DESCRIBED INCLUDING IN COMBINATION A FLEXIBLE CYLINDRICAL BELLOWS OPEN AT ONE END AND CLOSED AT THE OTHER WITH A PAIR OF HALF-SPHERICAL HOLLOW SHELLS, SAID SHELLS BEING MOUNTED INTO THE OPEN END OF SAID BELLOWS, EACH OF SAID SHELLS IN THE PAIR HAVING A CIRCUMFERENTIAL OUTER FLANGE, WITH THE FLANGE OF ONE SHELL ADHERING TO THE FLANGE OF THE OTHER SHELL TOGETHER TO FORM A HOLLOW SPHERICAL RESERVOIR, ONE OF SAID SHELLS IN SAID PAIR BEING MADE OF HARD NON-YIELDABLE PLASTIC MATERIAL FORMED TO RETAIN ITS HALF-SPHERICAL CONTOUR AT ALL TIMES, THE OTHER SHELL IN SAID PAIR BEING MADE OF SOFT FLEXIBLE MATERIAL IN THE SHAPE OF A YIELDABLE HALF-SPHERICAL MEMBRANE, SAID YIELDABLE MEMBRANE WHEN THE PUMP IS INOPERATIVE FITTING SNUGLY INTO THE HOLLOW HALF-SPHERICAL SPACE PROVIDED BY THE HARD SHELL; THE OPEN END OF SAID BELLOWS HAVING A CIRCUMFERENTIAL FLANGE CONTACTING THE FLANGE OF SAID RESERVOIR AND BEING MADE TIGHT THERETO, WITH THE SOFT SHELL FACING INTO THE HOLLOW OF SAID BELLOWS AND THE HARD SHELL FACING OUTWARDLY THEREFROM, A NIPPLE IN SAID HARD SHELL, AN OPENING IN SAID NIPPLE LEADING INTO THE HOLLOW OF THE RESERVOIR FORMED BY SAID PAIR OF SHELLS, SAID OPENING BEING NORMALLY CLOSED AND COVERED WITH A CAP ALLOWING NO ENTRY OF AIR INTO THE HOLLOW OF SAID RESERVOIR, THE PUNCTURING OF SAID NIPPLE ALLOWING FLUID TO ENTER SAID SPHERICAL RESERVOIR AND TO EXPAND SAID SOFT YIELDABLE MEMBRANE WHEN SAID BELLOWS PUMP IS IN OPERATIVE POSITION.