Patent
Device and method for determining gas volume and volumetric changes in a ventilator
Frank E. Block,Gustaf Järnefelt +1 more
Reads0
Chats0
TLDR
In this article, a detector for determining the volume and volumetric changes of respiratory gases in a closed circuit anaesthesia circuit having a bellows ventilator is presented. But, it is not shown that the volume of gas in the closed circuit anesthetic circuit is not changing, but is remaining at that corresponding to the given expanded position of the bellows.Abstract:
A detector for determining the volume and volumetric changes of respiratory gases in a closed circuit anaesthesia circuit having a bellows ventilator. The device includes a first sensor positioned with respect to the bellows for detecting and indicating when the bellows assumes a given expanded position in a bellows housing indicative of the given volume of respiratory gas in the circuit. A second sensor detects and indicates when the bellows assumes an expanded position indicative of the greater amount of expansion than that corresponding to the given expanded position. During respiratory cycles of the patient, indications from the first sensor in the absence of indications from the second sensor indicates that the volume of gas in the closed circuit anaesthesia circuit is not changing, but is remaining at that corresponding to the given expanded position of the bellows. Indications from both the first sensor and the second sensor indicates that the degree of expansion of the bellows is greater than that corresponding to the given expanded position and hence the volume of gas in the closed circuit anaesthesia circuit has increased. The absence of indications from both the first and second sensors indicates that the degree of expansion of the bellows is less than that corresponding to the given expanded position and that the volume of gas in the closed circuit anaesthesia circuit has decreased.read more
Citations
More filters
Patent
Infusion pump system with disposable cartridge having pressure venting and pressure feedback
TL;DR: In this article, the authors describe portable infusion devices, systems, and methods of using the same for dispensing materials, e.g., insulin, into a body in need of it.
Patent
Artificial airway device
TL;DR: In this paper, an artificial airway device was proposed to facilitate lung ventilation of a patient, comprising an airway tube, a gastric drain tube, and a mask including a backplate and a peripheral formation.
Patent
Laryngeal mask airway device
TL;DR: A modified laryngeal mask airway device (LMA-device) as mentioned in this paper was provided with means to improve ease of insertion, reliability of function and higher seal pressure (i.e., cuff pressure ratio).
Patent
System and method for conserving oxygen delivery while maintaining saturation
TL;DR: In this article, a system and method for maintaining a predetermined level of a treatment gas in a patient while conserving use of the treatment gas, comprising a source of the treated gas, a sensing device for sensing a breathing cycle of a patient, a conserver for controlling intermittent supply of treatment gas to the patient in response to the sensed breathing cycle, is presented.
Patent
Variable pressure and flow control for a pneumatically-operated gas demand apparatus
TL;DR: In this paper, a pneumatically operated gas demand equipment coupled in interruptible fluid communication between a recipient and a source of pressurized respiratory gas was adapted for controlling delivery of the pressurized gas to the recipient as the recipient inhales and exhales.
References
More filters
Patent
Pump for a portable ventilator
TL;DR: In this paper, a pump for portable ventilators is described, which includes a piston-cylinder arrangement in which the piston is reciprocally moved within the cylinder by rotating a shaft.
Patent
Inhalation anaesthesia equipment
TL;DR: In this paper, the authors present an anesthetic reservoir serving as the originating source for anesthetic and a ventilator to which the gas is supplied from the reservoir, the ventilators being in communication with the breathing passages of a patient.
Patent
Oxygen and anesthesia delivery and monitoring device
TL;DR: In this article, a servo-controlled replenishment mechanism is used to automatically maintain preset levels of oxygen and anesthesia gas for inhalation in a closed, recirculating delivery circuit.
Patent
Automatic bellows refill
Todd Keitel,Robert Q. Tham +1 more
TL;DR: In this paper, a system for automatically refilling the patient breathing circuit of an anesthesia system was proposed, where the system detects the existence of a large leak in the patient's breathing system and reduces the flow of the fresh gas to the patient circuit to minimize the amount of gas that is vented to the atmosphere.
Patent
Breathing gas system
Mikael Kock,Claes Eng +1 more
TL;DR: In this paper, an outlet valve is regulated at the end of an expiratory phase to minimize the pressure difference between the first space and the second space, which makes possible use of the pressureregulated operating mode with the breathing gas system, and a rapid response to attempts at spontaneous breathing by the patient is achieved.