Patent ID: 8043299

Claim:
An internal bone transport device, comprising: a substantially fixed length rod having a first end and a second end; wherein the first end of the substantially fixed length rod is configured to be coupled with a first portion of a bone to be lengthened and the second end is configured to be coupled with a second portion of the bone to be lengthened; and at least one moveable member placed between the first end and the second end of the substantially fixed length rod, wherein the moveable member is capable of moving substantially parallel to an axis which contains both the first end and the second end; wherein the moveable member is configured to be coupled with a third portion of the bone to be lengthened; a variable volume fluid container disposed between one of the first end and the second end of the substantially fixed length rod and the moveable member; a compression spring disposed between the other of the first end and the second end of the substantially fixed length rod and the moveable member; wherein the variable volume fluid container contains fluid; a one-way valve, wherein the one-way valve allows fluid to be decreased in the variable volume fluid container; wherein upon the decrease of at least a portion of the fluid from the variable volume fluid container, the compression spring expands to move the moveable member.