Infant Non-invasive Intracranial Pressure Monitor Micro-intelligent Constant Pressure Controller And Application

Among medicine clinical field, we use no-hurt intracranial pressure monitor for infant to monitor the intracranial pressure of the infant by anterior fontanel. Because of a great deal of uncertain influence factor in clinical, the small driver pressure to optical fiber sensor of intracranial pressure monitor is often unstable, thus influence the sensitivity and accuracy of the result. The research of the miniature intelligence constant pressure controller is stem from the instability of the small driver pressure on the optical fiber sensor.The miniature intelligence constant pressure controller of what the subject is developed regards P89C51RD2—single chip computer of PHILIPS Company as the control centre of the whole system, can carry on dealing with in time, operation to the signal that is given definitely and external interference, then drive the step motor to carry out the corresponding work, realize the closed loop control of the pressure. Using special purpose control chip L297 and L298 for step motor can simplify the hardware structure of the system and lighten the burden of CPU. The executive body adopts two separated miniature air cylinders that linked with plastic tube, this purpose is the weight that the systematic device adds on the head of service object (a baby here) should be within the range that it can be born.Because step motor and control system is a multiply non-linear system, setting up an accurate mathematics model has greater difficulty. Using traditional control algorithm will produce great error on the system, so on the basis of considering and comparing many kinds of control algorithm synthetically; we adopt PID neural network control technology finally. Result of emulation and debugged actually shows: PID neural network control technology can improve the systematic dynamic-static characteristic; Improve systematic stability and control precision, thus realized the goal of anticipated design.To sum up, this text has explained the basic operation principle of the miniature constant pressure controller involves in the design process at first, and then analyses the system hardware design, deepening discussion of the software design of control strategy of control system. We debugged and verified its feasibility actually through emulation finally. This research develops a miniature constant pressure controller based on no-hurt intracranial pressure monitor for infant for the first time at home and abroad. The step motor has been introduced into control system, and two separated miniature air cylinders that linked with plastic tube have been designed for the executive body skillfully aimed at the particularity of the service object; PID neural network control technology has been adopted because of the multiply non-linear system.