A pressure infusion device including a sealed bag of flexible, heat sealablematerial including generally opposed edge portions； a layer of substantiallytransparent material including generally opposed edge portions provided witha plurality of holes； the opposed edge portions of the sealed bag are folded overthe opposed edge portions of the layer of substantially transparent materialand are heat sealed to the sealed bag through the holes. A process for making a pressureinfusion device including the steps of providing a sealed bag of flexible, heat-sealablematerial having generally opposed edge portions； providing a layer of substantiallytransparent material including generally opposed edge portions； folding theopposed edge portions of the sealed bag over the opposed edge portions of the layerof substantially transparent material and heat sealing the folded edge portionsto the sealed bag through the holes.
