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 battery comprising:
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; and
a first amount of a liquid solvent;
wherein a second amount of the liquid solvent evaporated during processing of the battery, and
wherein a combination of:
the first amount of the 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 a viscosity to be deposited within the cavity formed within the laminate assembly; and
wherein 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 battery of claim 1 wherein the water soluble polymer/polymeric component is polyvinylpyrrolidone (PVP).
3. The battery of claim 1 wherein the first polymerizable monomer is a hydrophobic polymer with hydrophilic pendant group.
4. The battery of claim 3 wherein the hydrophobic polymer with hydrophilic pendant group is hydroxyethylmethacrylate (HEMA).
5. The battery of claim 1 wherein the second polymerizable monomer is a diester crosslinking agent.
6. The battery of claim 5 wherein the diester crosslinking agent is ethylene glycol dimethylacrylate (EGDMA).
7. The battery of claim 1 wherein the liquid solvent is isopropyl alcohol (IPA).
8. A battery comprising:
a first and second electrode;
an anode;
a cathode;
a laminate assembly comprising a cavity;
a separator comprising a permeable silicone hydrogel membrane wherein the separator is a polymerized mixture comprising:
hydroxyethylmethacrylate (HEMA);
ethylene glycol dimethylacrylate (EGDMA);
polyvinylpyrrolidone (PVP); and
a first amount of isopropyl alcohol (IPA); and
wherein a second amount of the isopropyl alcohol (IPA) evaporated during processing of the battery, and
wherein a combination of:
the first amount of the isopropyl alcohol (IPA),
the second amount of the isopropyl alcohol (IPA),
the hydroxyethylmethacrylate (HEMA),
the ethylene glycol dimethylacrylate (EGDMA), and
the polyvinylpyrrolidone (PVP),
is of a viscosity to be deposited within the cavity formed within the laminate assembly; and
wherein evaporation of the second amount of the isopropyl alcohol (IPA) 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.