172 results about "Anesthesia machines" patented technology

A method and an apparatus for monitoring and controlling flows in medical equipment including an anesthetic machine and a ventilator for influencing a patient's respiratory system are disclosed. The apparatus comprises a microprocessor and an airway system comprising drive gas conduits provided with an inhalation valve (2) and an exhalation valve (5) for gas discharging as well as a ventilator end flow sensor (3) for measuring the introduced or discharged drive gas flow through the valves. The airway system also comprises patient end breathing tubing in which a patient end flow sensor (11) for measuring the patient's inspired and expired gas flow is provided. By comparing the measured values of the two flow sensors against the characteristic curve of the inhalation valve (2), the microprocessor can judge the operation states and accuracy of the respective flow sensors and the inhalation valve (2).

The present invention relates to an apparatus for delivering an anaesthetic to human or animal patients. The apparatus comprises an anaesthetic machine which is arranged to mount components of an anaesthetic delivery circuit, and which includes a collector arrangement in the form of a manifold (21) having a plurality of inlets and outlets. The manifold (21) enables a reduction in the number of tubes connecting the various components in an anaesthetic system, which are normally required in prior art anaesthetic machines. The manifold (21) also includes an arrangement (40) which provides a Venturi effect on gas flow, and enables a pressure gauge (18) to be mounted out of a patient breathing circuit. The machine is preferably portable.

A multi-lumen breathing tube device providing for separate and bidirectional gas flow for expired and inspired gas during ventilation of a lung. Embodiments of the multi-lumen breathing tube include an improved laryngeal mask airway device and an improved endotracheal tube. The invention is compatible with a circle breathing circuit system used with many mechanical ventilators including those used in conjunction with anesthesia machines.

A gas administration apparatus, e.g., anesthesia machine, making use of three or more gas flow, e.g., vaporizer, units removably mounted thereon by an interlock exclusion system. The interlock/exclusion systems is operative to prevent opening of any gas flow unit if one gas flow unit is already open and irrespective of how many gas flow units are mounted on the apparatus at the time.

A patient airway dome including an adjustable frame having a hinge such that the hinge allows the frame to adjust between an erected position to create an airway dome and a collapsed position that allows the frame to lay flat, a dome covering located over the retractable frame, a plurality of ultraviolet lights operatively connected to the retractable frame, a plurality of superior glove access portals located on the dome covering, a plurality of inferior glove access portals located on the dome covering, an anesthesia circuit tube operatively connected to the dome covering, and an anesthesia machine connector operatively connected to the anesthesia circuit tube.

The invention discloses a method for adjusting pressure of an anesthesia machine and a breathing machine through flow and pressure common control, which is characterized by comprising the following steps of: calculating a pressure value under the current flow by using a formula P=F*R in a pressure control mode, wherein P is pressure; F is the current flow; and R is air resistance; estimating the pressure at a next moment under the current pressure value by using a Kalman estimation algorithm into which sub-items with control parameters influencing an overall estimation result are added; substituting the estimated pressure value into an error system to calculate a control error quantity, performing proportion integration differentiation (PID) control on the control error quantity, and converting into control pressure required at the next moment; converting the control pressure into standard control flow by using the formula P=F*R; and inputting the converted control flow into a flow PID ratio controller for flow feedback control.

The invention discloses an anesthesia machine system, comprising a gas source supply pipeline used for providing a gas source, a breathing circuit connected with a patient, and an air supply branch circuit, wherein a gas flow output end of the gas source supply pipeline and an air flow output end of the air supply branch circuit are respectively connected with the breathing circuit; the breathing circuit is internally provided with a pressure sensor used for measuring air pressure in the breathing circuit when the patient inhales; the air supply branch circuit comprises an air box, a one-way valve and a proportional electromagnetic valve which are sequentially connected by pipes along an air supply direction, wherein the opening degree of the proportional electromagnetic valve is changed according to measurement parameters measured by of the pressure sensor. The opening degree of the proportional electromagnetic valve is continuously changed and is also promoted to be changed by the change of a numerical value of the pressure sensor caused by neonatal tidal volume; anesthesia mixed gas is extruded by the pressure of airflow produced by the air box for the patient to use; the anesthesia machine system is accurate in control and wide in applicable people. The invention also discloses a control method of the anesthesia machine system.

The invention provides a two-position three-way valve which comprises a valve body (1), a valve core (2) and a plug (6); the valve body (1) is provided with a valve cavity (11); the side wall of the valve body is provided with an air outlet (B) communicated with the valve cavity; the valve core (2) extends into the valve cavity from one end and can move along the axial direction of the valve body; part of the valve, which protrudes out of the valve body, is provided with a plurality of vent holes (C), and the vent holes (C) can be communicated with the valve cavity through connection channels(21) in the valve core; the plug extends into the valve cavity from the other end, and is provided with an air inlet (A) communicated with the valve cavity, wherein a single-way valve gasket (5) is arranged between the plug and the valve core, so as to selectively communicate the air inlet and the air outlet or communicate the air outlet and the vent holes; the two-position three-way valve of theinvention can be combined into a gas-electric linkage switch with the power switch of an anesthesia machine, not only has good air-tightness, smaller size and low compression resistance, and can ensure the hand feel of the gas-electric linkage master switch.

The invention discloses a method for controlling pressure of an anesthesia machine and a breathing machine in a suction valve and expiration valve cooperative control mode, which is characterized by comprising the following steps of: performing flow rate estimation fuzzy control on suction valve pressure by the traditional flow and pressure cooperative fuzzy control method in a pressure control mode; monitoring a pressure variation condition in a system by using a pressure sensor, transmitting the pressure variation condition in the system to an expiration valve control unit and calculating an expiration valve control deviation; performing proportion integration differentiation (PID) control on set suction pressure through the pressure sensor in the suction process and performing the PID control on positive end expiration pressure in the expiration process by using an expiration valve; and grading expiration valve PID control parameters according to required focus points in the grading range of 1cm H2O to 80cm H2O, fitting the PID control parameters under the pressure at the focus points by a curve fitting method or a broken line approximate method, and synchronously controlling a suction valve and the expiration valve in the control process.

Algorithms for detecting endotracheal intubation and/or misplacement of endotracheal tubes in child patients during anesthesia for use with anesthesia machines, mechanical ventilators, and/or respiratory function monitors. An algorithm uses end-tidal carbon dioxide (EtCO₂), and tidal volume (TV) or peak inspiratory pressure (PIP) to detect exact intubation time. Another algorithm uses respiratory parameters to identify and/or confirm the type of airway device used during mechanical ventilation, and to detect if and when an issue has arisen with use of a specific airway device to provide real-time decision support to attending medical care professionals.

An electronic flow monitor, a control method and an anesthesia machine. The electronic flow controller can comprise a control module, an oxygen gas branch for delivering oxygen gas, an equilibrium gas branch for delivering equilibrium gas, and a gas mixing branch for mixing the oxygen gas and the equilibrium gas. The control module can meter an oxygen gas flow and an equilibrium gas flow through flow sensors. A first flow controller can be disposed in the oxygen gas branch, and a second flow controller can be disposed in the equilibrium gas branch. The first flow controller may be used to regulate the gas flow in the oxygen gas branch between zero and a maximum value and the second flow controller may be used to regulate the gas flow in the equilibrium gas branch between zero and a maximum value.

The invention provides a method for managing experimental animal respiration, which utilizes a clinic anesthesia machine for the anesthetization of the animal experiment, performs tracheal cannula on an animal, adopts an animal temperate maintenance instrument to keep warm, and keeps the body temperature at the physical level (37 plus or minus 0.5 DEG C) all the time during the anesthesia process. The method is used for solving the animal respiration management problem during the traditional anesthesia process, the same inhalation anesthesia concentration and the stable body environment are also maintained during the whole anesthesia process. By the method, not only is the stress response of the experimental animal reduced, but also the vital sign stability of the experimental animal can be maintained during the inhalation anesthesia process of a long time (such as 4 hours), the mortality is low and the reviving can be stable, and the influences of trauma stress, hypoxia-ischemia, hypercapnia, acidosis and other interference factors on the experimental result can be eliminated. The method effectively controls the respiratory tract of the experimental animal, and also maintains the inhalation anesthesia of the volatile anesthetics with constant concentration, which is output to the animal.

The invention discloses a method for controlling pressure of an anesthesia machine and a breathing machine by using an expiration flow sensor. The method comprises the following steps of: (1) monitoring expiration flow by using an expiration flow monitoring sensor which is arranged at the expiration mouth of an expiration valve; (2) establishing a closed-loop proportion integration differentiation (PID) flow control system for the expiration valve and the expiration flow monitoring sensor; (3) grading expiration valve controlled flow PID control parameters according to required focus points in the grading range of 1LPM to 300LPM, and fitting the PID control parameters under flow values at the focus points by a curve fitting method or a broken line approximate method; (4) calculating suction valve controlled output flow and expiration valve controlled output flow under set control pressure according to a formula P=F*R; and (5) performing pressure feedback control on the anesthesia machine and the breathing machine in a suction valve and expiration valve cooperative control mode according to the suction valve controlled output flow and the expiration valve controlled output flow.

The invention discloses an electric control breathing machine or anesthesia machine active exhalation valve based automatic calibration method. The electric control breathing machine or anesthesia machine active exhalation valve based automatic calibration method comprises step S00, entering into an exhalation valve calibration mode; step S10, setting N positive end-expiratory pressure values; step S20, determining a preset positive end-expiratory pressure value; step S30, performing inflation on an air channel and obtaining the positive end-expiratory pressure in the air channel when the pressure of the air channel exceeds the preset positive end-expiratory pressure value to be calibrated and is not less than a preset value Delta M; step S40, calculating an absolute value of a difference value between an end-expiratory pressure value and the current preset positive end-expiratory pressure value; step S50, judging whether the absolute value of the difference value is smaller than a preset threshold value Delta P or not, executing step S60 if yes and executing the step S30 otherwise; step S60, storing the end-expiratory pressure value and a control voltage value; step S70, judging whether measurement of the positive end-expiratory pressure values is achieved or not, executing step S80 if yes and executing the step S20 otherwise; step S80, obtaining the relation between end-expiratory pressure values and control pressure values through curve fitting.

The invention discloses an oxygen concentration auto-checking method of a respirator or anesthetic apparatus. The method includes the steps: A, after the respirator operates for a certain period of time, a judging unit judges whether check conditions of an oxygen concentration sensor are met or not, and a next step is performed until the conditions are met; B, the respirator automatically checks on oxygen concentration; C, a processing unit detects whether an oxygen concentration detection value is qualified or not; if yes, the oxygen concentration detection valve is recorded, and the automatic check process is complete; if not, an alarm unit sends out an alarm signal. The method has the advantages that after the respirator or anesthetic apparatus operates for a long period of time, oxygen concentration is automatically checked, the process takes short executive time, the control of current oxygen concentration is not affected, the display unit displays information related to automatic check of oxygen concentration, and accuracy of the oxygen concentration detection value when the respirator or anesthetic apparatus continuously operates for a long period of time can be ensured.

The invention belongs to the technical field of small animal anesthesia and relates to a simple economical small animal inhalation anesthesia machine which comprises a gas steel bottle, a gas adjusting valve, a three-way pipe I, a gas flow meter I, a gas flow meter II, an isoflurane gas volatilization bottle, a three-way pipe II, an adjustable three-way pipe, an anaesthetic mask, an animal body constant temperature system, an anesthesia induction box and a gas recycling bottle. The gas steel bottle is connected with the gas adjusting valve, the three-way pipe I, the gas flow meter I, the gas flow meter II, the isoflurane gas volatilization bottle, the three-way pipe II, the adjustable three-way pipe, the anaesthetic mask, the animal body constant temperature system, the anesthesia induction box and the gas recycling bottle in sequence. Using results show that the simple economical small animal inhalation anesthesia machine is simple and reasonable in structure, various parts are fixed and combined in a coordinating mode, small animals can be subjected to anesthesia control in short time or long time, accurate anesthesia depth is guaranteed, safety is good, after operation, the morbidity and the mortality of the small animals are low, and the operation success rate is high.

The invention discloses a method and a device for controlling turbines in order to control output pressures. The method for controlling the turbines includes steps of S00, enabling anesthesia machines or respirators to enter output pressure control modes; S10, judging whether the anesthesia machines or the respirators enter the output pressure control modes for the first time or not, executing a step S20 if the anesthesia machines or the respirators enter the output pressure control modes for the first time, or executing a step S70 if the anesthesia machines or the respirators do not enter the output pressure control modes for the first time; S20, inflating airways by the aid of the turbines at preset lowest rotation speeds and detecting the ventilation time; S30, judging whether the ventilation time is equal to a preset ventilation time threshold value or not, executing a step S40 if the ventilation time is equal to the preset ventilation time threshold value, or executing the step S20 if the ventilation time is not equal to the preset ventilation time threshold value; S40, detecting internal pressure values of the airways; S50, computing required second rotation speeds of the turbines when internal pressures of the airways are increased from the original zero and then are equal to preset target pressures P by the aid of the turbines; S60, enabling the turbines to rotate at the second rotation speeds so as to inflate the airways; S70, judging whether the internal pressure values of the airways are equal to the preset target pressures P or not; S80, enabling the anesthesia machines or the respirators to enter expiration stages; S90, judging whether the output pressure control modes are terminated or not, and enabling the anesthesia machines or the respirators to enter next ventilation periods if the output pressure control modes are not terminated.

The invention provides a device for controlling a brushless direct-current motor for anesthesia machines. The device comprises a speed detector used for detecting the rotation speed of a brushless direct-current motor, an acquisition device used for acquiring a current signal and a voltage signal of the brushless direct-current motor, a three-phase inverter connected with the brushless direct-current motor, a driver used for driving a power tube in the three-phase inverter to be switched on/off, a current regulator used for carrying out PID regulation according to the current signal and a preset current reference signal to generate a first control signal according to which the driver drives the power tube in the three-phase inverter to be switched on/off so as to regulate the rotation speed of the brushless direct-current motor, a signal singularity analyzer used for generating a speed instruction according to the current signal, the voltage signal and the rotation speed of the brushless direct-current motor, and a speed regulator used for carrying out PID regulation according to the rotation speed of the brushless direct-current motor and the speed instruction to generate a second control signal and generating a speed regulation instruction according to the first control signal and the second control signal to regulate the rotation speed of the brushless direct-current motor.

The invention provides an inhalational compound anaesthetic agent. The inhalational compound anaesthetic agent is characterized by comprising an A agent and a B agent, wherein the A agent serves as an inducer and comprises nitrous oxide, sodium chloride, perfume and a compound emulgator; the B agent serves as an anesthesia retaining agent and comprises flos daturae, radix aconiti agrestis, sevoflurane, sodium chloride, perfume and a compound emulgator; according to the A agent, the content of nitrous oxide is 1-5%, the content of the compound emulgator is 15-25%, and the content of the perfume is 0.1-0.3%; according to the B agent, the content of flos daturae is 0.5-0.9g/100mL, the content of radix aconiti agrestis is 0.1-0.5g/100mL, and the content of the sevoflurane is 1.5-2.5%, the content of the compound emulgator is 10-20%, and the content of the perfume is 0.1-0.3%. The inhalational compound anaesthetic agent is simple to operate during use; the A agent can be used for quickly inducing anesthesia and can be directly inhaled by an inhaling device; the B agent is used for retaining anesthesia, can be inhaled by a matched anesthesia machine and can also be infused into the body by other manners; the infusing time and dosage can be flexibly arranged according to the needs of the operation; and the inhalational compound anaesthetic agent can be applied to complex or long-time operation.

The system and method includes a treatment device such as an anesthetic machine or IV, a monitor and a display configured to display real-time PK/PD data associated with an anesthetic agent administered to the patient. The system and method further includes a safety control means configured to control the display such that one of a basic display state, an interactive effects display state, and a display inhibited state is selected and displayed according to the anesthetic agents and levels of the same being administered to the patient.

The invention relates to a device for uniformly mixing anesthetic gas and detecting the concentration of the anesthetic gas. The device comprises a buffer mixing device and a detection device; the buffer mixing device is connected with the detection device through an air channel, the buffer mixing device is used for receiving anesthetic gas in the anesthesia machine and mixing the anesthetic gas,and the detection device is used for detecting the concentration of the anesthetic mixed gas coming out of a first anesthetic mixed gas outlet. Compared with the prior art, the gas contact area is increased through the spiral bent pipe, anesthetic gas is further mixed evenly through the convection principle, and the anesthetic drug concentration detection precision is improved. Gas is uniformly mixed by arranging a pure mechanical structure with two gas paths, extra energy does not need to be provided, energy consumption is reduced, and practicability is achieved.

The invention discloses a medical anesthesia breathing device, which relates to the technical field of medical equipment, and comprises an anesthesia machine console, a fixed support frame, an air bellow, an air guide pipe and a breathing mask, and a shell is provided with an adjustable support mechanism, an adjusting mechanism, an adsorption assembly, a driving part and a lifting assembly; the adjustable supporting mechanism comprises a supporting table, a first connecting rod, a first sliding block, a second connecting rod, a second sliding block and an angle sensor, the two ends of the first connecting rod and the two ends of the second connecting rod are connected with the supporting table, the first sliding block and the second sliding block correspondingly, and the first sliding block and the second sliding block are slidably connected to the shell. The straight rod is movably arranged in the rotating pipe in a sleeved mode, the adjusting type gear is movably arranged on the outer side of the rotating pipe in a sleeved mode, one end of the straight rod is connected with an ejector block, the ejector block is connected with the first sliding block or the second sliding block in an attached mode, the other end of the straight rod is connected with a lifting assembly, the adjusting type gear and the lifting assembly are both connected with the driving part in a meshed mode, and the adsorption assembly is connected with the adjusting type gear in an adsorption mode.