Surgery – Respiratory method or device
Patent
1989-06-21
1991-05-28
Crowder, Clifford D.
Surgery
Respiratory method or device
272 99, 12820213, A63B 2300
Patent
active
050185179
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an expiration-resisting apparatus designed for improving pulmonary ventilation.
Various apparatus are known which are intended for a specific therapy in the respiratory field, by improving the peripheral ventilation of invalids having a respiration which is disturbed for various causes, such as, for example, chronic bronchitis, asthma, problems as regards compliance, inadequate ratio of the pleural pressure with respect to the alveolar pressure, secondary infection, hypersecretion and mucous blockages, etc. These apparatus are used with success, but they are, however, all of a complex design, generally very cumbersome and very costly.
Apparatus of small dimensions have already been developed, which comprise a horizontal air passage connected to a vertical air passage comprising an outlet orifice, a movable element being so disposed as to obstruct the outlet orifice prior to expiration and to oppose a resistance to the expiration under the action of a resilient member or due to the effect of its own weight. In particular, an apparatus has been developed in which a heavy ball is disposed in the exhaust passage in the form of a vertical funnel, the ball, free to be displaced vertically, being lifted from its support at the time of expiration and offering a resistance to the expiration by the effect of its own weight. However, the results obtained with this apparatus are not as good as those obtained with the aforementioned more complex apparatus. Clinical tests have particularly shown that the percussion effect obtained with this type of apparatus remains small and is difficult to control.
The object of the invention is to propose an apparatus which permits of obtaining results equivalent to those obtained with the apparatus of more complex design and which is of small dimensions, is simple and less costly and which can easily be carried, for example, in a pocket.
To this end, the expiration-resisting apparatus in accordance with the invention has the features which are specified in claim 1. Features corresponding to particular embodiments of the resistance apparatus are set out in the claims which are subordinate to claim 1.
Studies and clinical tests which have been conducted have made it possible to show the importance of the inclination of the axis of the conical passage, so as, to form, firstly, a bed for the displacement of the ball and, secondly, an obstacle to this displacement, so as to obstruct the passage, thus enabling the ball to maintain a permanent contact with its support and to obtain a percussion effect which is appreciably increased with respect to the effect obtained with the apparatus which have been described above, while aiming for a low frequency.
Other advantages and favourable characteristics of the expiration-resisting apparatus according to the invention will become more clearly apparent from the following description, given as an example and with reference to the accompanying drawing, wherein:
FIG. 1 is a vertical section of a first example of an expiration-resisting apparatus,
FIG. 2 is a vertical section of a second example of an expiration-resisting apparatus, and
FIG. 3 shows a third example of a resisting apparatus, seen from the front in FIG. 3a and from the side in FIG. 3b.
As shown in FIG. 1, the apparatus comprises a first element in the form of a bent cylindrical tube 1, open at its two ends, comprising a first rectilinear tubular part 2 intended to be held in a horizontal position and a second tubular part 3 which is inclined upwardly relatively to the first part. The first tubular part 2 comprises an air inlet orifice 4, into which the patient is able to expirate. A conical element 5, of which the walls have the form of a truncated right cone of revolution, is disposed within the second tubular part 3, so that its end of larger diameter 7 is located at the level of the end of the second tubular part 3, the end of smaller diameter 6 of the conical element being disposed within the tubular element. A ball 8, having a diameter which is lar
REFERENCES:
patent: 737008 (1902-10-01), Nichol
patent: 3908987 (1975-09-01), Boehringer
patent: 4232683 (1980-11-01), Bartholomew et al.
patent: 4275722 (1981-06-01), Sorevsen
patent: 4403615 (1983-09-01), King
Crowder Clifford D.
Malvad Lisa E.
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