Reusable finger probe style sensor.
Masimo pulse oximeters use a variety of technologies to ensure accurate patient oxygen saturation in multiple health-care settings and come with a variety of probe sensors to ensure accurate oxygen readings.
Pulse Oximetry Basics
Standard pulse oximetry technology uses two light-emitting diodes (LEDs). One beams a red light and the other one an ultraviolet light. Both lights have different wavelengths and are aimed at a photodiode, or device used to measure wavelengths, at the other end of the sensor. Differences in absorption rates between the two waves by oxygen molecules on the red blood cells are measured and displayed as a percentage. For the oximeter to work, it must be placed on a translucent part of the body, such as a finger, earlobe or an infant's foot. For the oximeter to ignore variances caused by body tissue or nail polish, the minimum absorption rate is subtracted from the maximum absorption when the heart pumps the blood through the vessels. This explains why a pulse is important for the oximeter to function. This also allows the oximeter to display the pulse rate along with the percentage of oxygen.
Using the Sensor
Pulse oximetry has applications in many health-care settings where critical oxygen saturation measurements must be maintained. Masimo pulse oximeters employ four technologies, along with the red/infrared diodes, to minimize the possibility for errors, while maintaining the simplicity of use of traditional oximeters.
The reusable finger probe is a common sensor for pulse oximetry readings. It can be placed on any finger by simply squeezing the clip ends, placing the probe over the tip of the desired finger and releasing it. The spring-loaded hinge will secure the device in place.
The disposable finger probe is another type of sensor. First remove the adhesive backing, and place the sensor on the tip of the desired finger. Next, fold the halves so that the sensors match up, with one on top of the fingernail and the other on the pad of the finger. Finally, press the adhesive sides of the sensor firmly against the sides of the finger.
A third probe is called the ear probe. Apply it by squeezing the clip ends open and placing it on the patient's earlobe, then releasing it. The spring-loaded hinge will secure it in place.
The last type of probe is called the disposable neonate. Apply this type by removing the adhesive backing and placing the sensor on the nail of a big toe. Complete the application by wrapping the remaining adhesive strip around the rest of the toe and sensor.
Troubleshooting Pulse Oximetry
The Masimo pulse oximeter uses a variety of filters to minimize errors, but it may be prone to problems. If the display is inaccurate or reads zero for the oxygen saturation or pulse, first check that the appropriate sensor cable is not damaged and that it is correctly inserted into the monitor. If no reading appears, check that the sensor is properly positioned and that the patient is not moving the sensor excessively.
Be aware that other variables also influence oximeter readings, such as poor circulation to the fingers, excessive illumination and placing the finger sensor on an extremity with a blood pressure cuff.
Tags: finger probe, Masimo pulse, oxygen saturation, adhesive backing, along with, check that, clip ends