| 摘要 |
<p>A polyurethane foam article has a hydrophobic polyurethane foam layer and a hydrophilic/haemophilic polyurethane foam layer, the article having at least one cavity therein, the at least one cavity having a corresponding vent extending to the exterior of the article, the at least one cavity containing an analgesic fluid. This forms a pad. The cavity may be formed during the manufacturing process, which comprises dispensing a non-polymerised layer onto a hydrophilic/haemophilic layer, and polymerising the hydrophobic layer. Metal tongues are used to keep the hydrophilic layer in the correct position in the mould. Once polymerisation is complete the tongues are removed, to form a cavity or chamber in the interior of the article, which is then filled with analgesic using a syringe inserted into the vent. The analgesic is released when the article is used. Also described is a similarly layered article where at least one of the layers contains barium sulphate for radio-opacity. Preferably, the barium sulphate is in the hydrophobic layer.</p> |
