Four-channel functional electrical stimulation device based on complementary current source and time-division multiplexed output

Abstract

A four-channel functional electrical stimulation device based on a complementary current source and time-division multiplexing output, including: a main control processor circuit, a multiplexer, and a first output channel respectively connected to the output end of the multiplexer, a second The second output channel, the third output channel, and the fourth output channel, the main control processor circuit processes the externally input trigger channel signal and generates a channel selection signal, which is used to control the gating of the multiplexer, and the main control processor circuit The control processor circuit also generates the original channel stimulation small signal according to the externally input trigger channel signal and the externally input amplitude control signal, and the four-channel functional electrical stimulation device also includes a stimulating circuit driving stage and an H-bridge, and the stimulating circuit drives The stage includes a voltage-controlled current source and a complementary current source including a mirror current source and a mirror current drain. The invention is used in scientific research and clinical experiments related to the reconstruction of limb motor function of paralyzed patients by using functional electrical stimulation.

Description

technical field [0001] The invention belongs to a functional electrical stimulation device, in particular to a pulse-triggered four-channel functional electrical stimulation device using a complementary current source and time-division multiplexing output. Background technique [0002] Nerve functional electrical stimulation and neuromuscular electrical stimulation both use artificial pre-set format code sequences to stimulate nerves or neuromuscular junctions that innervate muscles, so as to achieve the purpose of muscle contraction and joint movement to complete limb movement. Therefore, functional electrical stimulation can be used for rehabilitation of hemiplegic limbs of stroke patients. Since the world's first functional electrical stimulation system was designed and used to correct foot drop in 1961, researchers have successively designed a series of functional electrical stimulation systems to improve the motor function of patients. [0003] Functional electrical st...

AI Technical Summary

Problems solved by technology

Three issues need to be paid attention to when using constant current electrical stimulation for motor function rehabilitation: first, the recovery of large muscles of the upper and lower extremities requires a large current output, which requires the circuit to have a high voltage operating range; second, long-term use of unipolar stimulation pulses will cause The accumulation of electric charge will cause damage to the skin tissue; the third is to produce a relatively comfortable and efficient muscle contraction action

However, this circuit structure needs to use high-precision matching resistors, which is easy to cause self-excited oscillation, and the op amp has a large starting current, high static power consumption, and low chip withstand voltage range, resulting in output stimulation pulse voltage and current limiting

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