Pacemaker's battery will be recharged by some external energy through the wire that expands from the battery to the skin button. This wire should be conductive, have strength for a long time, have flexibility to ensure patients comfort, and should be visual under radioscopy in order to monitor its condition over time. Also should be not toxic to the body.
Usually materials that have good conductivity typically lack good strength characteristics. There are some materials with radiopacity, but are usually lacking in the ability to withstand mechanical fatigue. In order to overcome these problems, we are designing a wire with three different material compositions that each will fulfill our ideal wire characteristics. After making a wire we will coat it with polyurethane to prevent toxic leakage from the wire to the body.
According to figure bellow our wire is consist of an outer sheath of MP35N which provides substantial strength and fatigue performance. The central layer represents high purity Platinum, thus providing excellent visualization under radioscopy. For increased conductivity, a silver core has been used. With this design we offer strength, conductivity, and flexibility. We can conclude this by performing strength test, fatigue test, and since we are connecting three different materials, we need to test the corrosion to see the effect them on each other.
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After completion of our tests on the wire and the materials we will cover it with polyurethane to shield the body from the possible infection and toxicity. Polyurethane is known for its biocompatibility and strength and been used in artificial heart manufacturing. Cardiac control system is using this polymer for their pacemakers lead and reported that has 97% survival rate. .
Before coating our wire, first we need to apply pretreatment surface that includes surface cleaning and removing contaminants. Then we need to reduce the shear stress on the polyurethane by the wire material.
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