Evaluation: Masimo Radius-7 with Root for Continuous Vital Signs Monitoring

October 12, 2016 | Evaluations & Guidance


  • Masimo's Radius-7 continuously measures patient vital signs including oxygen saturation (SpO2), pulse rate (PR), and RRa on adult and pediatric (above 2 years) patients in inpatient lower-acuity care settings.
  • Additional vital signs such as noninvasive blood pressure (NIBP) and temperature can be measured using the Root system.
    • The Root system analyzes and interprets vital signs data to offer trends, and alerts clinicians to emergent events like high RR or low SpO2.
    • The Root system also allows manual entry of parameters such as level of consciousness, pain scale, and glucose level.
    • These parameters can aid in providing the clinician with a better picture of the patient's health.
    • An optional ISA (Infrared Sidestream Analyzer) capnography module can be utilized with the Root system to measure and record end-tidal CO2 (EtCO2).
  • Major device components and software features:
    • Radius-7—An arm-worn device intended for continuous monitoring of an ambulatory patient. The Radius-7 comes with two battery modules, one instrument module, and one battery-charging adapter. It measures and displays SpO2, PR, and RRa, and also displays perfusion index (PI) and pleth variability index (PVI) derived from these measured vitals. The Radius-7 uses a Bluetooth connection to transfer Radius-7 information and data to the Root monitoring platform. When not connected to a network, the patient-worn device can serve as an independent patient monitor. The Radius-7 does not hold patient ID; rather, it holds a unique Bluetooth key to connect with a single Root (which holds patient ID). The Radius-7 includes the following:
      • Acoustic respiration sensor—Measures RR using rainbow Acoustic Monitoring. The sensor is an adhesive patch with an integrated acoustic transducer (microphone) placed on the patient's neck to monitor the vibrations and noise associated with inspiration and expiration.
      • SpO2 sensor—Measures arterial oxygen saturation and pulse rate. Masimo recommends placing the sensor on the patient's ring finger for parameter measurements, even in motion and low-perfusion environments.
      • Battery-charging adapter—Docks onto the Root to function as both a charger and holder for the Radius-7 and provides the mechanism for associating a Radius-7 to its Root through the passing of a Bluetooth radio key.
      • Instrument module—Has a Bluetooth radio to connect with the Root. The sensors are also connected to the instrument module.
      • Battery module—A rechargeable lithium-ion battery module that snaps onto the instrument module. The battery module powers the instrument module and offers a display screen, touchpad, and speaker. It enables association of an instrument module with the Root: When a battery module is docked in the battery-charging adapter, a key is passed from the Root to the battery module, and then on to the Bluetooth radio in the instrument module when the battery module is undocked and installed in the instrument module.
    • Root—A patient monitoring and connectivity platform present at the patient's bedside. This monitor receives patient vital signs data from the Radius-7 using Bluetooth, from probes and modules attached to the Root (e.g., temperature, NIBP, EtCO2), and from manually entered parameter values (e.g., level of consciousness, pain scale). The Root communicates and transfers patient data to the central monitoring display (Patient SafetyNet) over an 802.11 a/b/g wireless network or a wired Ethernet connection. The Root acts as a charging station for the Radius-7. The Root is used to:
      • Admit and discharge patients
      • View graphical trends for SpO2, RR, pulse rate, temperature, NIBP, and, if the ISA module is used, EtCO2 (refer to the list of optional device components below for additional details)
      • View real-time data, including visible and audible alerts and alarms
      • Charge the Radius-7; a battery-charging adapter is used to dock the Radius-7 onto the Root
      • Push patient information directly to the electronic medical record (EMR)
      • Serve as a connectivity hub to gather patient data from different medical devices connected to the patient (e.g., ventilators, infusion pumps)
    • Parameter probes—The following parameter-specific probes are connected to the Root bedside platform; these probes do not permit ambulatory use.
      • NIBP cuffs
      • Oral/rectal/axillary thermometers
      • Nasal cannula for measuring EtCO2
    • Patient SafetyNet View Station and Appliance—View Station allows a centralized display for up to 40 devices at a time. The Appliance is a Linux-based server for clinical information management and can monitor up to 200 devices. It is used to:
      • Admit and discharge patients
      • Connect to the admission/discharge/transfer (ADT) feed (automatic or manual) to enable patient ID and demographics
      • View near-real-time graphical trends for SpO2, RR, pulse rate, temperature, NIBP, and, if the ISA module is used, EtCO2
      • Serve as a secondary source of audible and visible alarms
      • Store patient information
      • Generate and print system and patient reports
      • Communicate to secondary alarm notification systems or middleware for clinician notification
      • Send patient vitals data and alarms to the patient EMR via an HL7 (Health Level 7) interface at a hospital-defined time interval
  • This device is typically used in medical-surgical units and postsurgical units.
  • Below is an illustration of the Radius-7 and the Root, followed by a schematic of the system. (Top image is courtesy of Masimo.)


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