Abstract: A method for delivering a medication into a body cavity includes the steps of inflating a flexible bag within the body cavity such that the flexible bag expands to fill most of the void of the body cavity, and injecting medication into the space between an exterior surface of the flexible bag and the cavity wall such that the medication substantially surrounds the flexible bag and fills the remaining void. The steps of inflating the flexible bag and injecting medication are accomplished through subcutaneous injection at a site remote from the body cavity. To accomplish this, a surgically implantable tumor access device includes co-located first and second injection ports, for respectively, receiving a sterile fluid and a fluid medication. A flexible fluid conduit, which includes two coaxial tubes, directs the injected fluids, in a manner providing separate fluid flow paths, to a point adjacent to an inlet for the flexible bag. An inner tube fluidly connects the flexible bag with the first injection port.

Abstract: A wireless, surgically implantable pressure transducer for measuring pressure of fluid or tissue in a body chamber such as brain ventricle of a patient suffering hydrocephalus or a severe head injury. The transducer includes a coaxial variable capacitor electrically connected across an inductor to form a parallel resonant L-C circuit. Alternatively, a coaxially variable inductor may be connected across a capacitor to form the L-C circuit. A bellows is mechanically connected to the variable component to vary the value of capacitance or inductance and hence the resonant frequency of the L-C circuit in response to pressure changes of the fluid in which the bellows is immersed. The transducer is electromagnetically coupled to an external source of variable-frequency oscillatory energy such as a grid-dip oscillator which enables external detection of the transducer resonant frequency which is in turn indicative of the level of fluid pressure being sensed.