Differential parameters that characterize the elasticity of the blood vessel wall in the human body, denoted as α, exhibit slow changes over an extended period. Additionally, external factors such as the intake of antihypertensive drugs can induce alterations in the parameter α. These changes contribute to an escalation in the error of the fundamental blood pressure calculation model. Consequently, many measurement methods necessitate the regular calibration of model parameters using a cuff sphygmomanometer.