Abstract: Tool for use by brain operation comprising a guiding/support-tool (1) provided for mounting on the head of a patient over an operation aperture as for example a probe may be inserted into the brain of the patient, along with system to determine the depth of the insertion and coordinate of the insertion tool for use by brain operation. Said tool (1) having fastening means for a pointing device, which is connected with an image processing unit for calculation of the insertion depth of the probe, the coordinate and direction of the probe/insertion tool may be ovelaid the visualized image respectively images of the brain. Further said tool (1) has adjusting means (7, 21) for adjusting the tool (1) in desired direction of the probe.

Abstract: An inflatable balloon is disposed into a body cavity and inflated to expand into the body cavity. A subcutaneously implanted, resealable catheter is coupled to the inflatable balloon. The resealable catheter provides repetitive access for an optical fiber disposed through a first lumen to illuminate the inner surface and for a radiation source disposed on the distal tip of a wire to provide repetitive long term, fractionated photodynamic and radiation therapy to tissues adjacent to the inner surface. A light diffusing fluid is disposed in the inflatable balloon. The catheter has a self-healing membrane coupled to and closing its proximal end. An insert is coupled to the proximal end and to the first lumen in the subcutaneous, resealable catheter.

Abstract: Laboratory investigations in vitro of destruction and damage of living cells frequently involve labeling of the tissue cells in question with a radioactive isotope and subsequent dispersion of the cells in a suitable liquid. The dispersion is allowed to settle in a test tube, whereby a column of supernatant liquid is formed above precipitated cell particles. The radioactivity of said supernatant liquid is considered to be a measure of cell destruction and in order to measure the same while completely separated from the precipitated cell tissue, either the total amount or an accurately known fraction of the liquid must be collected, yet at the same time avoiding any collection of the precipitated particles.