Electrode and cable connections in electrocardiography systems
In electrocardiography (ECG) system, a patient cable connecting one or more electrodes to a processing device for processing ECG signals may include one or more electrode connectors mechanically keyed to respective electrodes and/or a device connector mechanically and/or electronically keyed to a cable connector of the processing device. In some embodiments, keying between the cable and electrode is achieved, for example, with an electrode including a hollow-post portion that defines a bore in conjunction with a post protruding from an arm of the electrode connector that is sized to fit within the bore.
1. A system comprising:
one or more electrodes each comprising a hollow-post portion defining a bore; and
a cable comprising one or more respective electrode connectors configured to engage with the one or more electrodes, each electrode connector comprising a pair of clamp arms connected at an axis of rotation and movable relative to each other about the axis of rotation, a first one of the clamp arms comprising a post sized and shaped to fit within the bore of the hollow-post portion of the respective electrode, and a second one of the clamp arms comprising, at an inner surface thereof, an electrically conductive contact surface complementary in shape to a portion of an exterior surface of the hollow-post portion, the contact surface being electrically connected to a wire running within the cable.
2. The system of claim 1 , wherein the post protrudes from the clamp arm parallel to the axis of rotation and the contact surface is positioned opposite to the post.
3. The system of claim 1 , wherein the cable further comprises, at an end opposite the one or more electrode connectors, a device connector configured to mate with a cable connector of a processing device.
4. The system of claim 3 , wherein the device connector is mechanically keyed to the cable connector.
5. The system of claim 4 , wherein the device connector comprises a plug configured to be received within a jack of the cable connector, the plug having a pair of parallel edges of differing lengths, the device connector further including, protruding from a housing, a contact block comprising a plurality of contacts enclosed by a trapezoid shroud having a pair of parallel edges of differing lengths, a shorter one of the pair of parallel edges of the trapezoid shroud being adjacent a longer one of the pair of parallel edges of the plug and a longer one of the pair of parallel edges of the trapezoid shroud being adjacent a shorter one of the pair of parallel edges of the plug.
6. The system of claim 3 , wherein the device connector is electronically keyed to the cable connector via a non-standard pin assignment.
7. The system of claim 3 , further comprising the processing device, the processing device configured to process signals acquired by the one or more electrodes.
8. The system of claim 1 , wherein the one or more electrodes are part of one or more respective electrode assemblies, each electrode assembly further comprising a backing through which the electrode extends and a hydrogel patch disposed on the backing on a side opposite the hollow-post portion.