Methods and apparatus to form separators for biocompatible energization elements for biomedical devices
Methods and apparatus to form biocompatible energization elements are described. In some examples, the methods and apparatus to form the biocompatible energization elements involve forming cavities composing active cathode chemistry. The active elements of the cathode and anode are sealed with a biocompatible material. In some examples, a field of use for the methods and apparatus may include any biocompatible device or product that requires energization elements.
1. A biomedical device comprising:
an electronic component configured to perform a predetermined function; and
a biocompatible energization element including:
a first and second electrode;
an anode;
a cathode;
a laminate assembly comprising a cavity;
a separator comprising a permeable hydrogel membrane wherein the separator is formed from a polymerized layer mixture comprising:
a water-soluble polymer/polymeric component;
a first polymerizable monomer;
a second polymerizable monomer;
a first amount of a liquid solvent; and
a second amount of the liquid solvent which is evaporated during processing of the biocompatible energization element, wherein a combination of the first amount of liquid solvent, the second amount of the liquid solvent, the water soluble polymer/polymeric component, the first polymerizable monomer, and the second polymerizable monomer is of the viscosity to be deposited within the cavity formed within the laminate assembly and wherein the evaporation of the second amount of the liquid solvent shrinks the deposit within the cavity to a thin coating along a bottom of the cavity and along sidewalls of the cavity to form the separator.
2. The biomedical device of claim 1 wherein the water soluble polymer/polymeric component is polyvinylpyrrolidone (PVP).
3. The biomedical device of claim 1 wherein the first polymerizable monomer is a hydrophobic polymer with hydrophilic pendant group.
4. The biomedical device of claim 3 wherein the hydrophobic polymer with hydrophilic pendant group is hydroxyethylmethacrylate (HEMA).
5. The biomedical device of claim 1 wherein the second polymerizable monomer is a diester crosslinking agent.
6. The biomedical device of claim 5 wherein the diester crosslinking agent is ethylene glycol dimethylacrylate (EGDMA).
7. The biomedical device of claim 1 wherein the liquid solvent is isopropyl alcohol (IPA).
8. The biomedical device of claim 1 wherein the biomedical device is an implantable device.
9. The biomedical device of claim 1 wherein the biomedical device is an electronic pill.
10. The biomedical device of claim 1 wherein the biomedical device is an ophthalmic device.
11. The biomedical device of claim 1 wherein the biomedical device is a defibrillator.
12. The biomedical device of claim 1 wherein the biomedical device is a stent.