 Pulse oximeter probe-off detector |
| To compute peripheral arterial oxygen saturation, denoted SP.sub.a O.sub.2, pulse oximetry relies ... |
|
| Sensor wrap including foldable applicator |
| Accordingly, one aspect of the present invention is to provide a reusable/disposable (resposable) ... |
|
| Pulse oximetry data confidence indicator |
| FIG. 1 illustrates the standard plethysmograph waveform 100, which can be derived from a pulse ... |
|
| Low power pulse oximeter |
| Increasingly, pulse oximeters are being utilized in portable, battery-operated applications. For ... |
|
| Stereo pulse oximeter |
| Prior art invasive oxygen assessment techniques are inherently limited. Specifically, in vitro ... |
|
| Signal processing apparatus |
| This invention provides improvements upon the methods and apparatus disclosed in U.S. patent ... |
|
| Dual-mode pulse oximeter |
| FIG. 1 illustrates a prior art pulse oximeter 100 and associated sensor 110. Conventionally, a ... |
|
| Low-noise optical probes for reducing light piping |
| The present invention involves a probe for use in non-invasive energy absorption (or reflection) ... |
|
| Method and apparatus for disabled access to polling places |
| The present invention provides a method for enabling access for persons with disabilities to ... |
|
|
Pulse oximetry sensor adapter
| Details |
Inventors: Kiani, Massi E.; Smith, Robert A.; Tobler, David R.;
Assignee: Masimo Corporation (Irvine, CA)
Primary Examiner: Winakur; Eric F.
Assistant Examiner:
Attorney, Agent or Firm: Knobbe, Martens, Olson & Bear, LLP
An adapter allows the interconnection of a sensor originating from one manufacturer to be coupled with conventionally incompatible monitors originating from other manufacturers to form a properly functioning pulse oximetry system. The adapter matches a sensor driver in a monitor to the current requirements and light source configuration of a sensor. The adapter also matches a sensor's light detector signal level to the dynamic range requirements of a monitor preamplifier. Further, the adapter provides compatible sensor calibration, sensor type and security information to a monitor. The adapter may have a self-contained power source or it may derive power from the monitor, allowing both passive and active adapter components. The adapter is particular suited as an adapter cable, replacing a conventional patient cable or sensor cable as the interconnection between a sensor to a monitor in a pulse oximetry system. |
|
DETAILED DESCRIPTION A drawback to conventional pulse oximetry systems is the lack of standardization of the sensor and the monitor.
Unless the sensor and the monitor are manufactured by the same company, it is unlikely that these two components can be connected as a functioning pulse oximetry system.
This incompatibility is mainly due to physical configuration and signal parameter differences among both the sensors and the monitors.
Sensors differ primarily with respect to the configuration, drive requirements and wavelength of the LEDs.
Sensors also differ in the configuration and value of coding and calibration resistors used to identify, for example, sensor type or LED wavelength.
Monitors differ primarily with respect to the configuration and current limit of the LED driver; the amount of preamplifier gain applied to the photodiode detector signal; and the method of reading and interpreting sensor coding and calibration resistors.
Further, the physical interface between sensors and monitors, such as connector types and pinouts, is also variable.
Sensor and monitor variations among various pulse oximetry systems are discussed in detail below with respect to FIGS.
1 through 3.
FIG.
1 depicts one type of sensor 100 and a corresponding monitor 150 for one type of pulse oximetry system.
For this particular sensor 100, the red LED 110 and infrared LED 120 are connected back-to-back and in parallel.
That is, the anode 112 of the red LED 110 is connected to the cathode 124 of the infrared LED 120 and the anode 122 of the infrared LED 120 is connected to the cathode 114 of the red LED 110.
Also for this sensor 100, the photodiode detector 130 is configured so that the photodiode leads 102, 104 are not in common with either of the LED leads 106, 108.
As shown in FIG.
1, the sensor 100 is also configured with a coding resistor 140 in parallel with the LEDs 110, 120.
The coding resistor 140 is provided as an indicator that can be read by the monitor 150, as described in pending U.
S.
patent application Ser
|
| Related patents |
|
|
System and method of determining whether to recalibrate a blood pressure monitor
OF THE PREFERRED EMBODIMENTS A preferred embodiment concentrates on the physiological parameter of blood pressure, however, many additional physiological parameters can ...
|
|
|
Shielded optical probe and method having a longevity indication
The present invention satisfies the foregoing needs by providing an improved optical probe for use in non-invasive energy absorption or reflection measurements, as well ...
|
|
|
Variable mode averager
A common smoothing technique uses an average to fit a constant, v.sup.A, to a set of data values, {v.sub.i ; i=1, 2, . . . , n}: ##EQU1## A generalized form of equation (...
|
|
|
Elastic sock for positioning an optical probe
Accordingly, one aspect of the instant invention is to provide a securing mechanism for an optical probe capable of functioning in a wide variety of potential ...
|
|
|
System for indicating the expiration of the useful operating life of a pulse oximetry sensor
Accordingly, one aspect of the present invention is to provide an inexpensive, highly accurate sensor life monitoring system for monitoring the useful and safe life of a ...
|
|
|
Pulse oximeter probe-off detection system
The present invention provides a number of improvements that can be incorporated into a pulse oximeter probe to detect when a probe has become dislodged from a patient ...
|
|
|
Pulse oximeter monitor for expressing the urgency of the patient's condition
The present inventors recognized several disadvantages inherent in the pulse oximeter monitor technology described in the prior art. First, in order to be able to ...
|
|
|
Universal/upgrading pulse oximeter
FIG. 1 illustrates a prior art pulse oximeter 100 and associated sensor 110. Conventionally, a pulse oximetry sensor 110 has LED emitters 112, typically one at a red ...
|
|
|
Pulse oximetry pulse indicator
FIG. 1 illustrates the standard plethysmograph waveform 100, which can be derived from a pulse oximeter. The waveform 100 is a display of blood volume, shown along the y-...
|
|
|
Method and apparatus for demodulating signals in a pulse oximetry system
The present invention avoids the problems associated with conventional demodulation and separation of TDM signals. In particular, the present invention avoids the ...
|
|
|
Communications 
