| 摘要 |
In the implantable pressure sensor disclosed herein, a radio-opaque liquid is contained within a resiliently compressible vessel of a silastic material, i.e. a silicone rubber, the volume of liquid actually contained within the vessel being then variable as a function of the pressure or force applied to the vessel. The silastic is rendered impervious to the radio-opaque liquid by a treatment which involves expanding and saturating the cured silastic with a mixture of a hydrocarbon solvent such as heptane containing a dissolved wax such as beeswax. The solvent expands and saturates the silastic, carrying beeswax into the silastic. When the solvent evaporates, the beeswax is then trapped within the interstices of the silastic, under tension. |
