Double chamber tissue expander
First Claim
1. A tissue expansion device for subcutaneous implantation and delivery of a tissue expansion promoter in a patient comprising:
- an expansion and delivery means for subcutaneous implantation and tissue expansion comprising an expandable outer bladder prepared from a stretchable porous material capable of discharging an infusion solution therethrough, andan expandable inner bladder disposed within said outer bladder and prepared from a stretchable non-porous material, which inner bladder and outer bladder are non-adherent, said inner bladder serving to effectuate the majority of the expansion of said expansion and delivery means;
wherein said inner and outer bladders are attached to a substantially non-stretchable and non-expandable rigid backplate member;
means for delivering said infusion solution adapted for location external to said patient in use, and in fluid communication with an interior of said outer bladder; and
means for inflating said inner bladder adapted for location external to said patient in use, and in fluid communication with an interior of said inner bladder.
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Abstract
A tissue expansion device for subcutaneous implantation in a patient consisting of an implantable expandable bladder prepared from a porous material which defines an infusion solution chamber, and an inner bladder disposed within the outer bladder prepared from an expandable non-porous material which defines an expansion solution chamber. Liquid transport means are provided for introducing and removing an infusion solution into and out of the infusion solution chamber, and fluid transport means are provided for introducing and removing an expansion fluid into and out of the expansion solution chamber. Following implantation of the tissue expansion device subcutaneously, expansion fluid can be introduced into the expansion chamber by use of the fluid transport means causing the inner bladder to expand. The expansion of the inner bladder exerts pressure on the infusion chamber, which contains infusion solution introduced through the liquid transport means. The infusion solution passes through the pores of the expandable porous material into the tissue surrounding and contacting the expansile porous wall of the implanted tissue expansion device. The outer bladder also expands, due primarily to expansion of the inner bladder and to introduction of infusion solution. The infusion solution can contain agents to facilitate the expansion process, such as hyaluronidase, lidocaine, epidermal growth factor, or dexamethasone, or any combination thereof.
168 Citations
14 Claims
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1. A tissue expansion device for subcutaneous implantation and delivery of a tissue expansion promoter in a patient comprising:
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an expansion and delivery means for subcutaneous implantation and tissue expansion comprising an expandable outer bladder prepared from a stretchable porous material capable of discharging an infusion solution therethrough, and an expandable inner bladder disposed within said outer bladder and prepared from a stretchable non-porous material, which inner bladder and outer bladder are non-adherent, said inner bladder serving to effectuate the majority of the expansion of said expansion and delivery means; wherein said inner and outer bladders are attached to a substantially non-stretchable and non-expandable rigid backplate member; means for delivering said infusion solution adapted for location external to said patient in use, and in fluid communication with an interior of said outer bladder; and means for inflating said inner bladder adapted for location external to said patient in use, and in fluid communication with an interior of said inner bladder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification