PIC16C54 MCU in Nerve Stimulator (1)

First, an overview

Life system of nerves, muscles are excited about the Organization, for the outside world a certain stimulus will react to this kind of reaction to neural impulses, muscle contraction, vascular relaxation, etc.

Peripheral Nerve Stimulator is used for surgical anesthesia process, through stimulation of peripheral nerves cause patient's muscle secondarymyokymia to observation of neuromuscular pharmacology of an instrument. If anesthesia is not deep, Stimulator stimulates the ulnar nerve of the forearm, thumb of adductor action; if you enter the depth of anesthesia, the thumb of the adductor action disappears. Peripheral nerve stimulator of the pulse width is stimulated, current strength in 200us 10mA--60mA six adjustable, it has four different ways of working:

(1) single stimulation (TWH).

Stimulation cycles to 1 second, (2) tetanic stimulation (TOF). Stimulation cycle is 15 seconds, and (3) double tetanic stimulation (DBS). Stimulation cycle is 15 seconds (4) strong straight after count (PTC). Frequency is 50 Hz duration of 5 seconds, stop 3 seconds per second issued a single pulse, a total of 16. Each work is provided with instructions and output intensity, output signal time precision control by software.

This article describes the peripheral nerve Stimulator, the use of single-chip as the core component PIC16C54, tie MONOSTABLE, operational amplifier and stimulating isolation circuit components stimulation system for Stimulator functions.

2. hardware design PIC16C54 SCM is an 8-bit microcontroller, a small size, low power consumption, internal using high-speed CMOS technology, performance, high volume air-tightness, with "watch dog" and is kept confidential, and low prices. Peripheral Nerve Stimulator hardware works diagram shown in Figure 1.

Second, hardware design

PIC16C54 SCM is an 8-bit microcontroller, a small size, low power consumption, internal using high-speed CMOS technology, performance, high volume air-tightness, with "watch dog" and is kept confidential, and low prices.

Peripheral Nerve Stimulator hardware works diagram shown in Figure 1.

Figure 1 schematic diagram

Figure 2 is the program's main process