Dialysate Bypass Control for Faster Blood Inlet Estimation

The patent applies preliminary action by pre-calculating and storing scaling factors for multiple bypass times in a lookup table or characteristic curve during system initialization or calibration phase. When bypass is activated, the control unit can immediately retrieve the appropriate scaling factor based on the actual bypass duration without waiting for diffusive equilibrium, enabling fast determination of blood inlet values while maintaining accuracy through pre-computed correction factors.

The patent replaces the physical/chemical process of waiting for diffusive equilibrium with a computational approach. Instead of mechanically timing the bypass until equilibrium is reached, the system uses a detection unit to measure dialysate outlet values and applies pre-stored scaling factors through mathematical calculation to determine blood inlet values, substituting the natural diffusion process with an engineered computational model.

The patent applies parameter changes by introducing scaling factors that vary with bypass time duration. The control unit selects or calculates the appropriate scaling factor based on the actual bypass time achieved, transforming the relationship between bypass time and determination accuracy. This allows the system to use variable bypass times while maintaining accuracy through dynamic parameter adjustment rather than requiring a fixed predetermined time.

The patent creates a computational model (characteristic curve or lookup table) that copies the relationship between bypass time, diffusive equilibrium state, and blood inlet values. This model allows the system to simulate the effect of different bypass durations and select the appropriate correction factor, enabling accurate determination without actually waiting for equilibrium at each measurement point.