CPMX1 - The Compartmental Compressibility Monitoring System (CPMX1) is a point-of-care device for non-invasive, real-time, and intermittent monitoring of relative compartment compressibility.The CPMX1 System includes the CP Probe, a handheld and reusable probe combining a flat linear ultrasound array with an integrated pressure sensor to obtain cross-section ultrasound views of the compartment of interest. The CP Probe works in conjunction with the CPMX1 Software, which provides a surrogate metric of the compartment's compressibility in one ultrasound image plane only, using a linear measurement of distance between two points of the compartment, as a function of applied external pressure.Based on this measurement, a relative compartment compressibility value is calculated and displayed on-screen as the CP Value.