| CPC A61F 5/003 (2013.01) [A61F 5/0036 (2013.01); A61F 5/0046 (2013.01); A61F 5/0089 (2013.01); A61M 39/227 (2013.01)] | 18 Claims |

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1. A medical device for occupying a space within a patient's body, the medical device comprising:
a device body having an interior reservoir;
a fluid filler material configured to expand within the interior reservoir;
a fill valve configured to deliver the fluid filler material into the interior reservoir, wherein expansion of the fluid filler material increases pressure against the fill valve, wherein the fill valve comprises a first layer and a second layer and a flow control material between the first layer and the second layer, wherein the fill valve comprises a first fluid path between the first layer and the second layer, wherein the fluid filler material closes the first fluid path by pressing the first layer and the second layer toward the flow control material such that the first fluid path is closed;
a release channel providing a second fluid path between an exterior of the device body and the interior reservoir;
a restraining element that closes the release channel such that the restraining element temporarily fluidly constrains the release channel closed to prevent fluid transfer between the exterior of the device body and the interior reservoir, wherein the restraining element is monolithic; and
wherein the fluid filler material degrades the restraining element to unseal the release channel.
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