Simplified display of end tidal co2

A carbon dioxide and signal technology, which is applied in the fields of pharmaceutical equipment, medical science, diagnosis, etc., can solve problems such as changes and etCO2 noise, and achieve the effect of reducing noise and reducing system errors

Active Publication Date: 2021-06-22
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, etCO measured by capnography 2 Tends to be noisy and can vary significantly between breaths

Method used

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  • Simplified display of end tidal co2
  • Simplified display of end tidal co2
  • Simplified display of end tidal co2

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Experimental program
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Embodiment Construction

[0017] It is difficult to assess etCO when the patient is breathing spontaneously and the degree of breathing is uneven 2 the trend of. etCO measured by a capnography device during spontaneous ventilation or pressure support ventilation, such as when a patient talks, coughs, suffers sleep apnea or drug-induced airway obstruction, or experiences acute respiratory depression following anesthesia for medical procedures 2 can vary significantly. With varying degrees of respiration, alveolar CO 2 Partial pressures are physiologically unlikely to correlate with etCO observed by capnography 2 Change just as fast.

[0018] The obvious solution is to smooth the etCO using a low pass filter etc. to remove the noise 2 Trendline. However, this paper recognizes that the method has a significant role in the measurement of etCO by capnography 2 has significant disadvantages. This is because, as recognized in this paper, introducing noise into etCO 2 Measured clinical conditions and p...

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Abstract

A capnography device comprising a capnography measurement component (20) configured to measure respiratory carbon dioxide levels and an electronic processor (30) programmed to generate a capnography graph signal (40), and end-tidal carbon dioxide (etCO2) is calculated by performing a sliding window max operation (42, 44) on 2 ) signal (50). In some embodiments, the sliding window maximum operation takes its duration (T W ) is a sliding time window (W) of at least 30 seconds. A smoothing filter may be applied to the capnogram signal prior to performing the sliding window max operation, and / or a smoothing filter may be applied (52) after the sliding window max operation to produce a smoothed etCO 2 signal (54). The capnography device may be a lateral flow capnography device (10) or a mainstream capnography device.

Description

technical field [0001] The following generally relates to the field of capnography and related fields. Background technique [0002] Capnography devices monitor the carbon dioxide (CO 2 ) concentration or partial pressure. A common capnographic parameter is conceptually the CO at the end of the expiratory phase 2 partial pressure of end tidal CO 2 (etCO 2 ). However, since this is often the maximum observed CO during the respiratory cycle 2 partial pressure, so etCO 2 Clinically defined as the maximum observed CO during the respiratory cycle 2 Partial pressure. eCO 2 Usually presented as a partial pressure (PetCO 2 ) or a percentage value. [0003] etCO measured by capnography 2 The parameter is generally used as a measurable surrogate for the maximum partial pressure of carbon dioxide at the alveoli. maximal alveolar CO 2 Knowledge of partial pressures is in turn useful in diagnosing the state of the lungs and cardiopulmonary system, and thus has great value f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/083A61B5/00
CPCA61B5/725A61M2230/432A61B5/0836A61B5/082
Inventor J·奥尔L·M·布鲁尔凯茨
Owner KONINKLJIJKE PHILIPS NV
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