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Radius T°™

Patient Temperature Sensor

D I R E C T I O N S   F O R   U S E

Single patient use only

LATEX

Not made with natural rubber latex

  

Non-sterile

Prior to using this sensor, the user should read and understand the Operator’s Manual for the Device and 
this Directions for Use.

INDICATIONS

Radius T°™ disposable sensors are intended for spot-check or continuous noninvasive monitoring 
of body temperature for use on Adult and Pediatric patients, 5 years of age or older in hospitals, 
hospital-type facilities, and home environments. 

CONTRAINDICATIONS

Radius T° sensors are contraindicated for patients who exhibit allergic reactions to adhesive tape.

DESCRIPTION

Radius T° sensors are battery powered, disposable sensors that are designed to continuously 
measure body temperature. The sensors are capable of adhering to patient’s skin and 
continuously transmitting temperature measurement data via Bluetooth communication 
protocol to a host device.

Note:

 Radius T° sensors are designed to be compatible with specific Masimo devices. See 

Compatibility section.

WARNINGS, CAUTIONS, AND NOTES

•  Radius T° sensors are used with specific monitors. Verify compatibility before use to ensure 

the sensors function properly.

•  Always ensure settings including alarms are appropriate for each patient and facility’s 

protocols prior to use.

•  The sensor should be free of visible defects, discoloration and damage. If the sensor is 

discolored or damaged, discontinue use. Never use a damaged sensor or one with exposed 
electrical circuitry.

•  Do not use the sensor during MRI scanning or in a MRI environment as it may result in 

physical harm.

•  Avoid contact with the sensor during defibrillation.
•  Do not use tape to secure the sensor to the site. Use of additional tape can cause skin 

damage, and/or pressure necrosis or damage the sensor.

•  Sensors that become partially dislodged may cause incorrect readings.
•  Rapid or large changes in ambient temperature may affect the measurement.
•  Inaccurate readings may be caused by misaligned sensor and/or EMI interference.
•  Check the sensor site to ensure skin integrity and to avoid damage or irritation to the skin.
•  The site must be checked frequently or per clinical protocol to ensure adequate circulation, 

skin integrity and correct alignment.

•  Exercise caution with poorly perfused patients. Assess site frequently and move the sensor 

if there are signs of tissue ischemia.

•  Periodically check the sensor site for proper adhesion to minimize the risk of inaccurate or 

no readings.

•  Do not modify or alter the sensor in any way. Alteration or modification may affect 

performance and/or accuracy.

•  To prevent damage, do not soak or immerse the sensor in any liquid solution.
•  Do not attempt to sterilize by irradiation, steam, autoclave or ethylene oxide as it will 

damage the sensor.

•  Do not use the sensor during surgical procedures.
•  Do not use Radius T° sensors in the presence of flammable anesthetics or other flammable 

substances in combination with air, oxygen-enriched environments or nitrous oxide to 
avoid risk of exposure. 

•  Do not attempt to reuse on multiple patients, reprocess, recondition or recycle Masimo 

sensors or patient cables as these processes may damage the electrical components, 
potentially leading to patient harm.

•  Replace the sensor when a replace sensor or equivalent message is displayed consistently. 

Consult monitoring device operator’s manual for more information.

•  Do not place the Radius T° near electrical equipment that may affect the device, preventing 

it from working properly.

•  Only use Masimo authorized devices with Radius T°. Using unauthorized devices with 

Radius T° may result in damage to the device and/or patient injury.

•  Portable RF communications equipment (including peripherals such as antenna cables 

and external antennas) should be used no closer than 30 cm (12 inches) to any part of the 
Radius T°, including cables specified by the manufacturer. Otherwise, degradation of the 
performance of this equipment could result.

•  Keep the Radius T° away from electrical equipment that emits radio frequencies to 

minimize radio interference. Radio interference may result in no or inaccurate readings.

•  The frequency bands of this device (2.4 GHz) are only for indoor use, in accordance with 

international telecommunication requirements.

•  Change or modifications that are not expressly approved by the manufacturer could void 

the user’s authority to operate the equipment.

INSTRUCTIONS

A) Site Selection

1.  Refer to 

Fig. 1.

 The preferred site is on the left side of the patients chest, below the collarbone.

•  Chose a site on the left side of the chest where the skin is clean of debris and dry prior 

Radius T°™

Patient Temperature Sensor

Masimo Corporation
52 Discovery
Irvine, CA 92618
USA
www.masimo.com

 Manufacturer:

© 2020 Masimo Corporation

301349/10714A-0720

EU Authorized Representative for Masimo Corporation:

MDSS GmbH
Schiffgraben 41
D-30175 Hannover, Germany

to sensor placement.

•  The site should be hair-free, cleaned of debris and dry prior to sensor placement. Use 

an alcohol swab to clean the application site, if needed.

•  Ensure orientation and location of the sensor on the patient matches the sensor site 

location in the Masimo device settings.

B) Applying the sensor

1.  Open the package and remove the sensor. 

Note: 

Do not remove the release liner at this point.

2.  Refer to

 Fig. 2. 

Pull to remove the plastic battery tab and dispose of the tab properly. 

3.  Refer to

 Fig. 3.

 Move the sensor close to the host device, to enable Bluetooth pairing.

Note: 

Refer to the host device Operator’s Manual for complete instructions.

4.  Clean and dry the sensor application site.
5.  Refer to 

Fig. 4. 

Pull off the release liner from the sensor and dispose of the liner properly.

6.  Apply the sensor on the patient to the selected application site.

 

7.  Apply pressure all around the perimeter of the sensor to ensure the adhesive is secure to the 

patient’s skin. Avoid contact with the exposed sensor adhesive.

8.  Ensure that the skin of the patient is relaxed and not stretched in any way and that there are 

no skin folds under the sensor pad.

C) Sensor Reapplication

Note: 

Radius T° sensors are designed for removal and reapplication no more than one (1) 

time over the life of the product.

1.  Clean and dry the sensor application site.

2.  Gently wipe the exposed sensor adhesive with an alcohol swab and allow to dry to restore 

the adhesive properties. 

3.  Follow steps 6 through 8 from above to re-apply the sensor.

D) Removing the Sensor

1.  Peel gently to remove the sensor from the patient.

Note: 

Disposal of Product: Comply with local laws in the disposal of the sensor, battery and 

its accessories.

LIGHT INDICATOR GUIDE 

Color 

Sensor

Description

Next steps

No light

---

•  Sensor power is off.  

•  Confirm battery pull tab has been removed to 

activate the battery.

•  Replace the sensor. 

Green

flashing

•  Sensor is on and waiting to pair with host device. 

•  Follow instructions to pair with the host 

device.

Blue

flashing

•  Sensor is waiting for user confirmation that 

desired sensor was paired to the host device. 

•  Verify sensor attachment so that host device 

can receive data.

solid

•  Successful pairing of sensor and host device. 
•  Host device successfully receiving data.

Orange

flashing

•  Low sensor battery

•  Consider replacing the sensor..

Red

flashing

•  Depleted sensor battery
•  Hardware or sensor failure, sensor blinking board 

failure code

•  Replace the sensor..

SPECIFICATIONS

The Radius T° sensors have the following specifications: 

Temperature measurement accuracy

±0.3°C in the range of 34°C to 40°C.

Application Site

Upper Chest, below the left collarbone

Product Use Life

Minimum of 8 days, continuous use

Battery Life

Minimum of 8 days (192 hours) of continuous run time

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