Adjustable implant
The present disclosure describes various embodiments of adjustable implants, particularly permanent breast implants, intended for implantation into a subject, particularly a human subject. In some embodiments, the adjustable implant comprises a shell including a resilient shell membrane, a first reservoir containing a fluid, e.g., a saline, a second reservoir including a resilient second-reservoir membrane, and a pump. The pump may include a first pump actuator, a first pump inlet, and a first pump outlet. The first reservoir and second reservoir may be disposed within the shell and be in fluid communication via the pump. Fluid may be transferred between the two reservoirs to change the profile of the implant.
1. A method of using an adjustable implant, comprising:
providing the adjustable implant, the adjustable implant having
a shell including a resilient shell membrane,
a first reservoir disposed within the shell and containing a first volume of a fluid;
a second reservoir including a resilient elastomeric second-reservoir membrane disposed within the shell,
a pump having
a pump outlet,
a pump actuator comprising an elastomeric button, the elastomeric button defining a chamber, the chamber containing a second volume of the fluid, and
a first valve disposed proximate the pump outlet,
wherein the first reservoir and second reservoir are in fluid communication via the pump and first valve;
depressing the elastomeric button;
advancing at least a portion of the second volume of the fluid past the first valve;
releasing the elastomeric button; and
withdrawing a third volume of the fluid from the first reservoir.
2. The method of claim 1 , further comprising:
introducing a fourth volume of the fluid into the second reservoir;
expanding the resilient elastomeric second-reservoir membrane to account for the fourth volume of the fluid entering the second reservoir; and
expanding the resilient shell membrane in response to expanding the resilient elastomeric second-reservoir membrane.
3. The method of claim 2 , wherein the pump further includes a release actuator disposed proximate the first valve and configured to open the first valve when actuated, the method further comprising:
actuating the release actuator;
opening the first valve to allow a fifth volume of the fluid to exit the second reservoir and flow toward the first reservoir;
contracting the resilient elastomeric second-reservoir membrane to account for the fifth volume of fluid exiting the second reservoir; and
contracting the resilient shell membrane in response to contracting the resilient elastomeric second-reservoir membrane.
4. The method of claim 3 , wherein the pump further has a pump inlet, the adjustable implant further has a second valve disposed proximate the pump inlet, and the release actuator is disposed proximate the second valve and configured to open the second valve when actuated, the method further comprising opening the second valve using the release actuator.
5. The method of claim 4 , wherein the adjustable implant is a breast implant and further comprising implanting the adjustable implant in a subject.
6. The method of claim 4 , wherein the adjustable implant includes a a first tube connected to the first reservoir and the pump inlet, and a second tube connected to the pump outlet and the second reservoir.
7. The method of claim 4 , in which the first valve comprises a backflow prevention valve having a first-valve outlet disposed further from the first pump actuator than a first-valve inlet.