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Publication Date: 2002-Apr-05

Publishing Venue

The Prior Art Database


A test fixture is disclosed for identifying individual wires within a multi-wire lead for identifying which wires are connected to which electrodes during the lead manufacturing process. The test fixture includes a clamp, a resister ladder network, a voltage reference source, a voltage probe, an A/D converter, a processor, and a visual/audible indicator. During manufacture, individual wires within the lead body are connected to electrodes at one end of the lead. At the other end of the lead, it is necessary to determine which wires are connected to which electrodes before the lead assembly is complete. A mechanical clamp holds down the electrode end of the lead so that each electrode is clamped at an assigned location. A plurality of resistors are connected in series to form a resister ladder. The connection node between each resistor in the resistor ladder is connected and clamped to a respective electrode at the clamped end of the lead. A voltage source of a known fixed value is applied to one end of the resistor ladder, whereby each node on the resistor ladder assumes a different voltage. The voltage appearing at the end of each wire at the unclamped end of the lead is measured. Such measurement identifies the electrode to which the wire is attached. The voltage measurement is performed through the use of an analog-to-digital converter that converts the analog voltage measured through a voltage probe to a digital voltage. The digital voltage is then input to a microcontroller. The microcontroller determines, based on the measured voltage, the particular electrode to which each wire is connected. A digital display, light, LED, buzzer, or other signaling device may be included within the test fixture to help identify the electrode to which each wire at the unclamped end of the lead is attached. This information then allows the assembly of the lead to be completed so that the wires at the unclamped or unassembled end of the lead can be attached to appropriate terminals, or other circuit elements, as a function of the electrode to which they are attached.