| 摘要 |
A "heart" unit serving as a partial analog system of the human body for demonstrating physiological events which occur during the growth of a brain tumor, including cardiac and respiratory failure during rapid tumor growth, for teaching purposes and the like, including an analog of the heart with fluid pumping means for inducing a pulsing flow; an analog of the respiratory muscles with means for inducing a secondary pressure pulse; an analog of the circulatory system including circulating fluid upon which said analog heart induces a pulsing flow and said respiratory muscles induce a pressure oscillation; an analog of the cranial cavity; an analog of a brain tumor with supplemental means for displacing a portion of the intracranial cavity; and an analog of the cerebral fluid within analog ventricles with means to flow in and out of the cranial cavity via analog subarachnoid paths to equalize cerebral pressure with the circulatory system pressure outside of the cranial cavity. The analog device includes fluid amplifiers using a confined stream of liquid. A simplified model of the system can be viewed as a rigid closed container, the volume of which is completely filled by many sacs filled with incompressible fluid, one sac being vented to atmosphere and another being connected to a fluid injection system. The injection of more incompressible fluid into any sac causes the fluid being displaced from the sac to be vented to atmosphere, thus maintaining volume equilibrium.
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