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Apparatus for the Determination of Pulmonary Function Parameters

IP.com Disclosure Number: IPCOM000018372D
Original Publication Date: 2002-Jun-01
Included in the Prior Art Database: 2003-Jul-23
Document File: 1 page(s) / 145K

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Christer Ström: AUTHOR

Abstract

It is known that pulmonary function parameters such as shunt and diffusion resistance can be estimated both in normal subjects and in postoperative patients. This may be done by varying the inspired oxygen fraction in order to achieve oxygen saturations in the order of 0.90 to 1.00 and subsequently making mea- surements, such as flow, pressure, inspiratory and expiratory O 2 and CO 2 levels in the inspired and the expired breathing gases. SaO 2 measurements, for example using a pulse oxymeter, are also employed in the calculation of the pulmonary function para- meters. One reason for the lack of general use of such a calculation in patient monitoring is the ab- sence of a simple breathing apparatus adapted to facilitate the making of the above described measu- rements, used in the calculation of the above mentio- ned parameters.

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Gesundheit

Apparatus for the Determination ofPulmonary Function Parameters

Idee: Christer Ström, S-Pieta

It is known that pulmonary function parameters suchas shunt and diffusion  resistance  can  be  estimatedboth in normal subjects and in postoperative patients.This may be done by varying the inspired oxygenfraction in order to achieve oxygen saturations in theorder of 0.90 to 1.00 and subsequently making mea-surements,  such  as  flow, pressure,  inspiratory  andexpiratory O 2  and CO 2  levels in the inspired and theexpired  breathing  gases.  SaO 2   measurements, forexample using a pulse oxymeter, are also employedin the calculation of the pulmonary function para-meters. One reason for  the  lack  of  general  use  ofsuch a calculation in patient monitoring is the ab-sence  of  a  simple  breathing apparatus adapted tofacilitate the making of the above described measu-rements, used in the calculation of the above mentio-ned parameters.

Fig. 1:

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A breathing apparatus for the determination of pul-monary function parameters is shown in Fig. 1 andcomprises a variable volume reservoir (2); a commonflow conduit (4) connected at one end to the reser-voir  (2)  and  connectable  at  the  opposite  end  to apatient’s airways (not shown), for example via a facemask or an endotracheal tube; in gas communicationwith the conduit (4),  a measuring head (6) for mea-suring inspiration and  expiration  gas  parametersnecessary for the calculation of the desired p...