Apparatus for aspirating a dead space
a technology for aspirating dead space and aspirating air, which is applied in the direction of respirator, valve details, life-saving devices, etc., can solve the problems of collapse of the lungs, unsatisfactory low pressure in the lungs,
Inactive Publication Date: 2007-01-25
MAQUET CRITICAL CARE
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Benefits of technology
[0014] This object is achieved in accordance with the present invention in an apparatus for aspirating a gas from a dead space, having aspiration tubing connected to the dead space, an extraction unit connected to the aspiration tubing, and a regulating unit for controlling operation of the extraction unit, wherein the regulating unit has a first signal input at which an expiration flow signal is received, representing a determined expiration flow with respect to time, and having a second signal input at which a dead space signal is received, representing the dead space that is to be aspirated during an expiration phase, and wherein the regulating unit optimizes the aspiration time and the aspiration flow so that the volume of the dead space can be aspirated during an ongoing aspiration without influencing the flow balance in the expiration flow upstream and / or downstream of the dead space, with the regulating unit regulating operation of the extraction unit to generate a determined aspiration flow during a determined aspiration time.
[0015] Instead of performing the aspiration during a pause at the end of the expiration, the aspiration is optimized during the expiration in a way such that the normal flow profile of the expiration is unaltered as viewed from an observation point upstream and / or downstream the dead space. This results in the aspiration being able to be temporally extended without disturbing the expiration. Lower flows may then be employed and the risk of an undesirable over-pressure in the lungs is reduced.
[0021] This collection may be achieved in several ways. One is, of course, to analyze the gas separately. However, in accordance with the present invention it is an advantage to return the aspired gas tot he dead space during an initial phase of the following expiration. The gas can then be analyzed in the same manner as the rest of the breathing gas.
[0022] As with aspiration, the re-supply can be done during a time and with a flow that are optimized for this. Likewise, this may be done without influencing the flow balance in the expiration upstream and respectively downstream the dead space.
Problems solved by technology
The former can create, as mentioned, an undesirable over-pressure while the latter can cause an undesirable low pressure in the lungs and in the worst case result in a collapse of the lungs (totally or partially).
Method used
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Embodiment Construction
[0030] The flow diagram of FIG. 1 illustrates a first embodiment for operation of the apparatus according to the. The flow diagram shows the flow, V, and the time t for four curves. The time axis is generally divided into inspiration 2 and expiration 4.
[0031] The uppermost curve represents a breathing cycle having a first expiration 6. Flow with respect to time is determined for the first expiration 6 in order to be used as a template for the time dependence of the expiration flow.
[0032] The second curve indicates that dead space flow 8 essential to aspire a determined dead space during a determined aspiration time taspids. The dead space flow is essentially formed by the quotient of the dead space volume and the aspiration time taspids.
[0033] In order to optimize the aspiration time and the aspiration flow in a suitable manner a first upper limit for these may be set up. With regard to the aspiration time, this may in theory be longer than the expiration time, but this would ser...
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In a method and apparatus for determining an aspiration flow and an aspiration time during aspiration of a dead space, the aspiration is made more effective by determining the volume of the dead space to be aspired during an expiration, determining an expiration flow with respect to time during at least a latter part of the expiration, and optimizing the aspiration time and the aspiration flow from the determined volume of the dead space and the measured expiration flow with respect to time is such a way that the dead space can be aspirated during an ongoing expiration with a minimum of interference to the flow balance in the expiration flow as observed from a point upstream and / or downstream the dead space.
Description
RELATED APPLICATION [0001] The present application is a divisional application of pending U.S. application Ser. No. 10 / 801,020, filed Mar. 15, 2004.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to an apparatus for aspirating a dead space in the context of providing breathing assistance. [0004] 2. Description of the Prior At [0005] Practically all forms of breathing apparatuses have a mechanical dead space that, during expiration, fills with a carbon dioxide-rich gas. This gas is returned to a user during the successive inspiration. [0006] The airways of the user furthermore can contribute with a physical dead space that increases the volume of the carbon dioxide rich gas that is re-breathed. [0007] In certain cases it is desirable to eliminate this re-breathing of carbon dioxide. This can be made by aspiration of the dead space. [0008] The aspiration of the dead space is described, for example, in PCT Application WO 91 / 19526. Essen...
Claims
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IPC IPC(8): A61M16/00
CPCA61M16/00A61M16/0009A61M2016/0042A61M16/0051
InventorHALLBACK, MAGNUSLARSSON, AKE
OwnerMAQUET CRITICAL CARE