| 摘要 |
In a blood exchanging apparatus useful for automatically withdrawing deleterious blood from the body, discharging said blood, and supplying a like quantity of specified blood for infusion into the bloodstream of the body, a syringe is coupled to a valve that includes a series of ports that provide passage for accomplishment of the foregoing select blood transferring functions, with the plunger of said syringe connecting with a carriage that threadedly engages to a feed screw that may be selectively turned in either direction by means of a reversing motor, with the turning of said motor being reversible by means of the actuation of limit means or switches that are functionally disposed to said feed screw and operative through the movements of said carriage for effecting their select actuation and reversal of said motor and feed screw. The valve is also sequentially set to provide for the select movements of blood into or from the syringe, and to achieve this a gear means connecting to said valve is turned by means of a drive means, such as a rack and pinion, that are actuated by a solenoid which is regulated in its functioning by means of the aforesaid limit means or switches.
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