squeeze bulb tube is depressed air is forced into the tube a diaphragm which is non porous and air tight is affixed to the opposite end of the flexible tubing as the volume of the vessel is reduced such as by depressing the squeeze bulb the liquid is forced from the tube through orifice 12 while air is forced through the orifice of the upper nipple 22 expanding the diaphragm the diaphragm is contained in a diaphragm canister 26 which is air tight as the diaphragm expands it in turn forces air from the diaphragm canister through the tubing which is connected to pressure gauge 18 as air is forced from the diaphragm canister the pressure increase through the tubing is detected by the pressure gauge in use the nipple of the vessel is inserted into the hole in the bone as shown in fig2 and fig3 the gasket surrounds the nipple and seats on the shoulder 30 of the vessel adjacent to the nipple and also seats on the surface of the bone the gasket material should be a relatively soft material which will seal the vessel against the surface of the bone to prevent the solution from escaping from around the gasket a gasket formed of soft silicone for example will adequately perform this function the effective volume of the vessel is then reduced in the preferred embodiment.