30 results about "Dead space" patented technology

The invention discloses a multi-channel air particulate matter sampler shunting device. The shunting device comprises an upper end cover and a lower end cover, wherein an airflow inlet is formed in the top end of the upper end cover; the lower end cover comprises a cylinder and a flange located under the cylinder; six conical grooves are uniformly formed in the upper surface of the cylinder around a center axis; side walls of the conical grooves are interested in the center of the cylinder to form a shunting body with a spire structure; airflow outlets are formed in the bottom of the conical grooves; the upper end cover and the lower end cover are buckled to form a shunting cavity. According to the shunting device, air sucked from the same airflow inlet is divided into six parts, the six air paths are symmetrically distributed, taken samples are completely parallel, and multiple parallel samples can be collected simultaneously under the condition of the same air source and the same power. The whole shunting cavity is not provided with a platform, so that dead space volume is avoided, and the problem that the sampling accuracy is influenced due to the fact that the airflow is directly intercepted by the platform is effectively solved.

An ambulatory assist ventilation (AAV) apparatus and system are disclosed for the delivery of a respiratory gas to assist the spontaneous breathing effort of a patient with a breathing disorder. The AAV system includes a compressed respiratory gas source, a respiratory assist device for controlling respiratory gas flow to the patient, a patient circuit tubing and a low profile nasal interface device, which does not have a dead space or hollow area where CO2 can collect, for delivering the respiratory gas to the patient, wherein the nasal interface device is fluidly connected to the respiratory assist device via tubing for receiving the respiratory gas therefrom. In some cases, the nasal interface device may be used in combination with other gas sources, such as oxygen concentrators, to provide dual therapy capability suitable for some applications.

The invention discloses an oxygen production adsorption tower. The tower comprises a tower body, an annular adsorption bin and a gas outlet channel. A gas inlet channel is arranged at the bottom of the tower body, and a filler channel is arranged at the top of the tower body. The annular adsorption bin is arranged in the tower body, the top of the annular adsorption bin is connected with the top of the tower body, and the annular adsorption bin is communicated with the filler channel; and the outer peripheral wall of the annular adsorption bin and the side peripheral wall of the tower body are arranged at intervals so as to form a gas inlet cavity between the outer peripheral wall of the annular adsorption bin and the side peripheral wall of the tower body, the gas inlet cavity is communicated with the gas inlet channel, and a gas outlet cavity is formed in the inner peripheral wall of the annular adsorption bin. According to the oxygen production adsorption tower, dead space can be reduced, gas distribution is uniform, and the operation efficiency of a system is improved.

The invention relates to a medical protective mask. The mask comprises a mask body and adjustable fixing bands penetrating out of the two sides of the mask body. The mask body comprises an upper piece, a body and a lower piece which are sequentially connected and are narrow on the two sides and wide in the middle. A nose wire is arranged at the upper edge in the upper piece. The adjustable fixingbands are arranged on the upper edge of the interior of the upper piece in a tight fit and penetrating manner, penetrate out to the outer side of the upper piece from the positions, which do not exceed the length direction of the nose wire, of the two ends of the upper piece, and penetrate through positioning belt buckles arranged in the middle of the outer side of the upper piece and corresponding to the nose wire in position. The overall filtering structure and mounting structure are more reasonable, the mask body is attached to the face outline, and reasonable stress included angles are formed between the mask body and the adjustable fixing bands in the up-down direction, so that the sealing performance of the mask body is protected, the size of the dead space is small enough, the gas exchange area during breathing is enlarged, and the mask is safe and comfortable to use.

The invention discloses buccal closed nebulization equipment. The buccal closed nebulization equipment comprises a mask, a fixing strap, a breathing tube, an air filter and a nebulizer nozzle, whereinthe fixing strap is connected with cheeks at two sides of the mask, the breathing tube is used for a patient to breath, the air filter is located at the exhaust end of the breathing tube, and the nebulizer nozzle communicates with the breathing tube in a crossing manner and is used for connecting a medical nebulizer. The buccal closed nebulization equipment can prevent viruses from diffusing intothe air when nebulization treatment is performed on a patient suffering from a respiratory infectious disease to avoid that medical workers and other patients are infected; dead spaces of a nasopharynx are reduced; the situation that the patient suffocates due to the fact that a respiratory tract is clogged is avoided; and breathing exercises of the patient can further be promoted, and thus, recovery of lung functions is facilitated.

The invention discloses a medical positive-pressure protective helmet capable of adjusting an air supply angle, belongs to the field of respiratory protection, and aims to solve the problems that the air supply angle of a common medical positive-pressure respiratory protection device is limited, the internal CO2 concentration is reduced slowly, and the internal gas fluidity is poor, so that a dead cavity exists, the CO2 concentration at the dead cavity is high, and the safety is high. According to the medical positive-pressure protective helmet capable of adjusting the air supply angle, an adjusting device is additionally arranged on the basis of an existing positive-pressure type respiratory protection device, so that clean air flowing through an air supply pipeline is adjusted through a spoiler after passing through the adjusting device, and then the air supply angle is adjusted through the spoiler; according to the medical positive-pressure protective helmet, air enters the face screen at multiple angles, the gas flowability in the face screen of the medical positive-pressure protective helmet is improved, formation of a dead cavity in the face screen is reduced, the conditions of uneven pressure distribution and uneven CO2 concentration distribution in the face screen are improved, and the using effect and comfort of a wearer are enhanced.

The invention relates to an injection type carbon dioxide regulator for a breathing machine, and aims to solve the technical problem of man-machine confrontation easily caused by providing carbon dioxide for a patient under the assistance of the breathing machine clinically in the prior art. According to the technical scheme, the injection type carbon dioxide regulator comprises a barrel, a piston, a hollow shaft push rod and a plurality of clamping strips, a hollow shaft through hole is formed in the middle of the top face of the barrel, clamping grooves for fixing the clamping strips are formed in the positions, located at the two ends of the hollow shaft through hole, of the top face of the barrel, and a trachea cannula connector integrated with the barrel is arranged at the bottom end of the barrel;the piston is arranged in the barrel; the hollow shaft push rod is inserted into the hollow shaft through hole and penetrates through the middle of the piston, the lower end of the hollow shaft push rod is flush with the bottom face of the piston, the top end of the hollow shaft push rod is a respirator connector and exceeds the top face of the barrel, and the clamping strips are evenly arranged on the two sides of the outer wall of the hollow shaft push rod. According to the invention, the volume of the breathing dead space can be adjusted by adjusting the up-and-down movement of the injection piston, so that the reutilization of carbon dioxide is increased.

Systems and methods for non-invasive ventilation are provided. The systems may include a gas source that provides breathing gases to a patient through one or more of a primary flow path (PFP) and a flushing flow path (FFP). The system may include a control assembly configured to open and restrict gas flow through the PFP. When the PFP is open, a significant portion of the gas flows through the PFP while the remaining gas flows through the FFP. When the PFP is restricted, a significant portion of the gas flows through the FFP. Increased flow through the FFP may have a high velocity (especially relative to the flow through the PFP). Gas delivered through the FFP may be used to flush dead space. One or both flow paths may contribute to inspiratory positive airway pressure (IPAP), expiratory positive airway pressure (EPAP), and/or positive end expiratory pressure (PEEP).

The invention belongs to the field of animal anesthesia, and particularly relates to an animal anesthesia machine. Comprising a bottom plate, a stand column is fixedly connected to the top end of the bottom plate, a cross beam is fixedly connected to the top end of the stand column, an anesthesia loop block is fixedly connected to one side of the outer wall of the cross beam, a switching valve is arranged on one side of the outer wall of the anesthesia loop block, and a soda lime box is fixedly connected to the bottom end of the anesthesia loop block. An anesthesia loop block is connected into the module, then a conventional circulating breathing loop pipe is connected into an air inlet port and an air outlet port of the module, a non-rebreathing type direct anesthesia mode can be achieved, when the direct current module is used, the breathing loop pipe applied in the rebreathing type circulating anesthesia mode can be shared, and the purpose that under low air resistance, the direct current module can be used for direct anesthesia is effectively achieved. The invention relates to non-rebreathing type direct anesthesia of a low dead space of a small animal.

Ventilator system with multiple inspiratory lumens is provided. The inspiratory lumens are configured so that separate inspiratory lumens provide inspiratory gas mixtures to separate portions of a patient's airways, for instance to separate lungs and/or bronchi. The ventilator system can include one or more expiratory lumens to evacuate expiratory gases from airways. The use of separate inspiratory lumen(s), with expiratory lumen(s), allows for functional separation of structural portions of the lungs, and maintenance of continuous or almost continuous flow through at least part of respiratory cycle via inspiratory and expiratory lumens. This can further reduce dead space and clear suspended therein diseases causative agents with improvement in outcomes, reduce risk of cross-contamination or cross-infection between different parts of airways, for example such as cross-infection from one lung lobe to another lobe or. The ventilator system allows for independent titration of PEEP, pCO₂ and pO₂ with no need for permissive hypercapnia.

An ambulatory assist ventilation (AAV) apparatus and system are disclosed for the delivery of a respiratory gas to assist the spontaneous breathing effort of a patient with a breathing disorder. The AAV system includes a compressed respiratory gas source, a respiratory assist device for controlling respiratory gas flow to the patient, a patient circuit tubing and a low profile nasal interface device, which does not have a dead space or hollow area where C02 can collect, for delivering the respiratory gas to the patient, wherein the nasal interface device is fluidly connected to the respiratory assist device via tubing for receiving the respiratory gas therefrom. In some cases, the nasal interface device may be used in combination with other gas sources, such as oxygen concentrators, to provide dual therapy capability suitable for some applications.

The present disclosure pertains to a system and method for monitoring lung disease in a patient that is based on information that is derivable from home therapy devices including a ventilation therapy device and an oxygen saturation monitor such as a pulse oximeter. The measured parameters are used to model shunt fraction and a volume of dead space. Based on changes in gas exchange and results of a nitrogen washout test, a change in gas exchange impairment in the patient is observed and is then used to determine progression of a disease, identify a cause of the impairment, and/or to guide treatment of the patient.

The invention discloses a bronchoscope forceps pipeline opening valve. An opening valve body is provided with a hollow pipe cavity, wherein an opening valve cover is inserted into one opening end of the opening valve body; the other opening end of the opening valve body communicates with a negative pressure device; a ventilation body is arranged on the side wall of the opening valve body; a pistoncavity is formed in the ventilation body; a piston body is arranged in the piston cavity in a sliding mode; a reset spring is arranged between the piston body and the piston cavity; an oxygen pipeline and a balance air channel which communicate with the piston cavity are further arranged on the ventilation body; and a ventilation pipeline is arranged in the piston body. The bronchoscope forceps pipeline opening valve has the advantages that the oxygen pipeline is connected with an oxygen pipe, oxygen can be directly blown into the trachea during bronchoscope examination, the breathing dead space is greatly reduced, and the possibility of oxygen deficit of a patient subjected to respiratory endoscopy examination is reduced; and during negative pressure suction, the piston is moved and compresses the spring due to the pressure difference between the negative pressure in the pipe cavity of the opening valve body and the balance air channel, the oxygen pipeline is blocked, the opening valve stops blowing oxygen, and the situation that the negative pressure suction effect is affected due to positive pressure oxygen supply is prevented.

A process, a signal processing unit and to a ventilator automatically calculate a set point for a frequency, with which the ventilator performs ventilation strokes and thereby mechanically ventilates the patient. An alveolar or proximal minute volume is predefined. A lung time constant for the lungs of the patient is determined. The volume of a dead space in a fluid connection between the lungs and the ventilator is determined. A mandatory frequency set point (f_set,mand) for the mandatory ventilation of the patient is calculated. An ideal frequency (f_spon), with which the patient can achieve the minute volume by means of spontaneous breathing, is calculated. The ventilation frequency set point is calculated as a weighted average of the mandatory frequency set point (f_set,mand) and of the ideal frequency (f_spon). The averaging depends on a determined actual intensity of the spontaneous breathing of the patient.