Surgery – Respiratory method or device – Respiratory gas supply means enters mouth or tracheotomy...
Patent
1997-10-30
2000-02-29
Weiss, John G.
Surgery
Respiratory method or device
Respiratory gas supply means enters mouth or tracheotomy...
12820418, 12820715, A61M 1600, A62B 906
Patent
active
060296666
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a device for delivering a ventilation gas, comprising a T-connector having a T-bar and a tubular stem, with a ventilation gas flowing transversely through the T-bar.
BACKGROUND
ARDS (adult respiratory distress syndrome) is a lung failure in human adults, caused by multiple factors and characterized by a serious disorder of the gas exchange in the lung. Treatment of such a respiratory insufficiency is effected by means of mechanical artificial ventilation. There have been repeated attempts for years to administer a ventilation gas into the lung by means of a ventilation tube via a jet nozzle (jet ventilation) having a small cross section at a high initial pressure and a high respiratory frequency (100-1500/min).
SUMMARY OF THE INVENTION
This invention aims at further developing a device of the initially defined kind which will ensure, simultaneously with basic respiration, 1) a sufficiently high peak pressure or pressure plateau brought about by a low respiratory frequency at a high initial pressure; and 2) a base filling with air provided during expiration, with the final expiratory pressure plateau, produced by a high respiratory frequency at a likewise high initial pressure, in order to safely prevent the lung from collapsing. At the same time, the device according to the invention also is to enable further functions, for example, ensuring the safe measurement of the respiratory pressure generated by the gas mixtures in the lung. Finally, the invention seeks to render feasible the realization of additional therapeutic or diagnostic measures without changing the device.
Accordingly, the configuration according to the invention includes a T-connector having a T-bar or cross member and a tubular stem part which extends perpendicularly away from the T-bar. An opening is provided in the T-bar, surrounded by a bushing, opposite the tubular stem part, i.e., the opening and the tubular stem part are coaxial. An open lid is adapted to be locked to the bushing. With this arrangement, a plurality of tubes having clear cross sections smaller than the clear cross section of the T-connector tubular stem part, extend through the opening and through the tubular stem part, transverse to the T-bar. At least two of the tubes are fed with pulsating pressure gases of different frequency.
By employing a plurality of tubes having smaller clear cross sections, it has become feasible to not only provide ventilation gas having a high predetermined pressure and predetermined respiratory frequency, but, at the same time, impress varying respiratory frequencies via various tubes differing from one another. Using two different respiratory frequencies, on the one hand, safeguards the respective basic filling during expiration (positive final expiratory pressure) thereby preventing the lung from collapsing completely (high respiratory frequency) and, on the other hand, allows for appropriate inflation (inspiratory pressure plateau) during inspiration (low respiratory frequency). By means of further such tubes having small clear cross sections, the respiratory pressure in the lung produced by the gas3 mixtures may be measured safely at a point suitable therefor, wherein for instance, isotonic saline solution or therapeutically active substances may simultaneously be injected and atomized through an additional tube of this kind. Advantageously, the device is further developed in a manner that the tubes have different lengths in the axial direction and the tube having the largest axial length is corrected with a pressure measuring means. By measuring the pressure via the tube having the largest axial length, the pressure prevailing close to the lung is detected, thereby actually allowing for the safe recording of the respiratory pressure.
In order to safeguard conditions that are beneficial to therapeutically active substances or to respiration, the configuration advantageously is devised such that one tube is designed with a substantially radial outlet nozzle and a shorter tube opens in the
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Aloy Alexander
Schragl Eva
Alexander Aloy
Weiss John G.
Weiss, Jr. Joseph F.
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