46 results about "Anaesthesia machine" patented technology

The invention belongs to the technical field of anaesthesia machines, and relates to an automatic target control method for the concentration of end-expiratory anesthetic gas of an anaesthesia machine and the anaesthesia machine. Calculating the deviation between the concentration of the end-expiratory anesthetic gas exhaled in the current respiratory cycle and a gas concentration set value; when the deviation and / or the change amount of the end-expiratory anesthetic gas concentration is larger than the threshold value, the flow of fresh gas used for flushing the anesthetic respiratory system is increased, and the anesthetic gas concentration of the fresh gas is adjusted till the deviation and the change amount of the end-expiratory anesthetic gas concentration are smaller than the threshold value; calculating predicted values of the concentration of the end-expiratory anesthetic gas in a plurality of future respiratory cycles; an anesthetic gas concentration optimization model is constructed and solved to obtain the optimal inhaled anesthetic gas concentration variation of each future respiratory cycle, so that the target flow of the fresh gas of each future respiratory cycle is calculated to control the conveying parameters of the fresh gas, and the final-expiratory anesthetic gas concentration is taken as an adjusting target to adjust the flow rate of the fresh gas. And the concentration of the end-expiratory anesthetic gas is effectively controlled through real-time feedback, dynamic prediction and adjustment.

The utility model relates to the technical field of water vapor filtration of an anaesthesia machine, in particular to a water vapor filtering device suitable for the anaesthesia machine, and solves the problems that the cooling time, the heat dissipation area and the cooling efficiency are influenced by a relatively short air flowing channel in the prior art, so that the filtering effect is relatively poor. A water vapor filtering device suitable for an anaesthesia machine comprises an upper tank body, an air inlet pipe is arranged on one side of the upper tank body, a separation sleeve is fixedly connected into the upper tank body, the top of the separation sleeve is communicated with an air outlet pipe, the air outlet pipe is communicated with the surface of the upper tank body, and a plurality of water absorption objects are fixedly connected into the air outlet pipe. The bottom of the upper tank body is in threaded connection with a lower tank body, the surfaces of the upper tank body and the lower tank body are fixedly connected with protruding rings, and a mounting mechanism is arranged between the two protruding rings. According to the utility model, the water vapor has longer cooling time and heat dissipation area, the cooling efficiency is improved, and a better dewatering and filtering effect can be ensured.

The invention relates to a mixing device (1) for a breathing or anaesthesia machine for mixing at least two breathing gas components, having a flow channel with at least two inlets (2, 3) for introducing the breathing gas components, 3) and a second flow channel section (5) with an outlet (7) for discharging a flow of breathing gas having a breathing gas component. The mixing device (1) is characterized in that the cross-section of the first flow channel section (4) decreases downstream at least in sections in the direction of the transition (6) from the first to the second flow channel section (4, 5), the first and second flow channel sections (4, 5) are inclined to each other, and the first flow channel section (4) opens into the second flow channel section (5) in the region of the transition (6) in such a way that the first flow channel section (4) opens into the second flow channel section (5). In this way, a vortex of the breathing gas flow around the longitudinal central axis (8) is formed at least partially in the second flow channel section (5), said vortex flowing helically in the direction of the outlet (7) at least in sections. The invention further relates to a breathing or anaesthesia machine having such a mixing device (1) and to a method for producing such a mixing device (1).

The invention relates to the technical field of medical instruments, in particular to a hand-operated machine-controlled switching valve device and an anaesthesia machine, and the hand-operated machine-controlled switching valve device comprises a valve seat (1) which is provided with a soda lime tank connector (16), an air outlet connector (2), a machine-controlled ventilation inlet (11), a hand-operated ventilation inlet (12) and a valve port (14); the valve rod (4) is arranged in the valve seat (1); the sealing gasket (10) is installed on the valve rod (4) and used for being in sealing fit with the first valve port side or the second valve port side of the valve port (14) when the valve rod (4) moves to the first position or the second position; and a driving source; under the action of a driving source, the valve rod (4) moves to a first position, so that the sealing gasket (10) closes the manual ventilation inlet (12) and opens the mechanical control ventilation inlet (11); and under the action of a driving source, the valve rod (4) returns to the second position from the first position, so that the sealing gasket (10) closes the mechanical control ventilation inlet (11) and opens the manual ventilation inlet (12), and automatic switching of ventilation channels is achieved.

An anaesthetic gas capture device housing two reusable canisters that safely capture volatile agents from the exhaust of an anaesthetic machine while maintaining a safe connection to a hospital AGSS and enabling the anaesthetic machine to continue to work in an active AGSS mode, without alteration, the device comprises or can be connected to suction means for drawing gas exhausted from a machine to the device, the suction means operates upstream of the capture canisters, the device is configured so that the suction means pushes gas through the canisters under positive pressure in series and agent extraction occurs under positive pressure, the device is pneumatically decoupled from the anaesthetic machine so that the device cannot apply vacuum pressure to the anaesthetic machine.

The invention provides an anaesthesia evaporator and an anaesthesia machine, and the anaesthesia evaporator comprises an evaporator disc which is driven by an external force to rotate around the center of the evaporator disc; the N anesthetic evaporation containers are fixed to the evaporator disc around the center of the evaporator disc, anesthetics stored in the anesthetic evaporation containers are different in type, and N is a natural number larger than or equal to 2; by rotating the evaporator disc, the anesthetic evaporation containers to be used are driven to rotate to the same designated position, and the anesthetic evaporation containers at the designated position face a patient; when the to-be-used anesthetic evaporation container rotates to a designated position, the to-be-used anesthetic evaporation container is powered on, and the idle state is switched into the using state; two openings are formed in a shell of the evaporator disc, and one opening is communicated with the anesthetic evaporation container in a use state and is connected to a respiratory system of a patient through a respiratory loop; and the other opening is communicated with the anesthetic evaporation container in an idle state, leads to the outside and is provided with a sealing cover for updating anesthetic.

The invention relates to the technical field of intelligent medical treatment, in particular to an artificial intelligence respiratory system based on an anaesthesia machine, which comprises a data acquisition and processing module, a database establishment module, a stress analysis module and an intelligent analysis module, the data acquisition and processing module is mainly used for acquiring and preprocessing data; the database establishing module is used for establishing a historical database according to the ventilation parameters, the physiological parameters and the individual parameters; the stress analysis module is used for establishing a lung geometric model and generating a visual map of stress deformation of a lung injury area through finite element analysis; and the intelligent analysis module is used for performing model training by utilizing a machine learning algorithm and establishing a breathing parameter optimization model and a lung injury risk assessment model. According to the method, the physiological parameters and the breathing characteristics of the patient are individually integrated in real time in the operation, the dynamic multi-dimensional database is constructed, and the breathing parameters are automatically adjusted to balance the pressure and capacity distribution in the lung, so that the incidence rate of lung injury is reduced.

The invention relates to the technical field of medical instruments, in particular to an exhalation valve assembly for an anaesthesia machine and the anaesthesia machine. The exhalation valve assembly for the anesthesia machine comprises an exhalation valve shell (1), a driving gas device (5), an exhalation valve (7), a waste gas connecting pipe (12) and a plurality of driving gas connecting pipes (9 and 10), a driving gas pipeline (3) is arranged in the exhalation valve shell (1), and the exhalation valve shell (1) is provided with a second driving gas connector (6), a third driving gas connector (15), an exhalation valve mounting port (16), a waste gas pipeline connector (11), a loop connector (17) and other connectors. Therefore, the communication with an exhalation valve (7), a waste gas pipeline and an anaesthesia machine loop is realized. The exhalation valve (7) and the safety valve assembly (14) are integrated, connecting and sealing points are reduced, and the leakage risk is reduced. The exhalation valve assembly is compact in structure, uniform in connector, capable of supporting modular assembly and convenient to maintain. The device has the advantages of high integration, high sealing performance, low cost, high reliability and the like, and is suitable for modern anesthesia systems.

The invention belongs to the technical field of medical instruments, and particularly relates to a knob protection mechanism and an anaesthesia machine. The knob protection mechanism comprises a housing, a sealing plate, a transparent warning plate and an elastic piece, the housing is provided with a first knob receding groove and a first scale perspective window, and the sealing plate is assembled in the housing in a front-back sliding mode; the second knob abdicating groove can control the exposed length of the knob, and the exposed length of the knob is not enough to hold in a normal state so as to prevent misoperation. The rear end of the transparent warning plate is hinged to the housing, the front end of the transparent warning plate is slidably hinged to the sealing plate, the transparent warning plate synchronously overturns along with the sealing plate during adjustment to shield the first scale perspective window, and striking warning is formed through orange-yellow color. The mechanism is further provided with a limiting sliding groove, a limiting protrusion, a shifting block and other structures, the operation process is simplified, one-hand operation is adapted, and disassembly, assembly and maintenance are convenient. The respiration anesthesia machine comprising the mechanism can improve the safety and convenience of standby oxygen regulation, is suitable for various medical scenes, and provides reliable guarantee for regulation and control of surgical anesthesia oxygen supply.

The invention discloses a tidal volume measuring system for an anaesthesia machine pipeline, and the tidal volume measuring system comprises a near-end detection assembly, a differential pressure sensor, a differential amplifier and a microprocessor, the near-end detection assembly comprises an external flow sensor, and the external flow sensor is arranged on a tracheal catheter; the external flow sensor is arranged in the tracheal catheter and used for converting gas flow energy in the tracheal catheter into the pressure difference between the pressure high end and the pressure low end of the external flow sensor, and the pressure difference sensor is used for converting the pressure difference between the pressure high end and the pressure low end into a pressure difference electric signal. And the microprocessor is used for obtaining the gas flow in the tracheal catheter according to the electric signal output by the differential amplifier. The external flow sensor is arranged in the tracheal catheter, the flow energy of the gas in the tracheal catheter is directly detected, the actual tidal volume of a patient can be reflected more truly, interference caused by the volume change of a pipeline is avoided, and therefore the measurement error is remarkably reduced, and the gas flow measurement accuracy is improved.

The present application relates to a kind of anaesthesia machine control system, the system specifically includes: acquisition module, information interaction module, information processing module, gas monitoring control module, backup power supply, power monitoring module and display screen;Power monitoring module is used to monitor the state of external power supply in real time, when external power supply appears exception, immediately switch to backup power supply, simultaneously, the power monitoring module also monitors the state of backup power supply in real time, controls backup power supply to charge according to need;Information processing module utilizes double model structure to carry out numerical information fusion, obtains anaesthetic gas control information.The present application also relates to a kind of anaesthesia machine control method and anaesthesia machine.Anesthesia machine using the system and method of the present application, not only can guarantee the accurate anaesthetic gas supply for individual control to user, simultaneously, can guarantee uninterrupted power supply, guarantees the smooth of anaesthesia processing and the safety of user.

An anaesthesia machine integrates the presence and state of charge of another medical device, such as a video laryngoscope, into operation. The anaesthesia machine communicates with the medical device to determine the presence and state of charge and present this information to a user as part of an examination procedure. A medical device mount is associated with the anesthesia machine to receive and charge the medical device. The medical device mount may include both a medical device charging mount and a battery charging mount that receives and charges a replacement battery. The medical device mount may communicate with the anesthesia machine to provide the charging and presence state of the medical device. During the examination procedure of the anaesthesia machine, presence and battery status information may be presented to the user, or the user may be prompted to manually enter this information into the anaesthesia machine.

The utility model provides a locking mechanism and an anaesthesia machine, the locking mechanism comprises a first locking assembly and a second locking assembly, the first locking assembly comprises a locking piece and a first sensor; the locking piece is provided with a first locking structure; in the locking state, the first locking structure can be locked with a second locking structure of the anaesthesia machine in a matched mode, the locking piece is located at the first sensing position, and the first sensor outputs a first sensing signal. In an unlocking state, the first locking structure can be separated from the second locking structure, the locking piece is located at a second sensing position, and the first sensor outputs a second sensing signal; the second locking assembly comprises an elastic interlocking assembly and a second sensor; the elastic interlocking assembly can move from an unlocking position to an interlocking position after being driven; in the interlocking position, the elastic interlocking assembly is located at a third sensing position, and the second sensor outputs a third sensing signal. By means of double locking of the locking mechanism, potential safety hazards caused by mistaken use of the evaporator can be avoided.

The invention discloses a precision detection method for a laughing air electronic control flowmeter in an anaesthesia machine. The method comprises the following steps: connecting a gas flow detection device with a flow control system; carrying out precision calibration on the gas flow detection device; oxygen enters through the oxygen inlet and is introduced into the atmosphere, air enters through the laughing gas inlet, the air inlet is closed, and a first flow value recorded by the gas flow detection device is obtained; laughing conversion coefficients at different preset flow values are calculated respectively; determining a verification conversion coefficient; oxygen with a fixed flow value enters through the oxygen inlet and flows through the gas flow detection device, air enters through the laughing gas inlet, the air inlet is closed, and a second flow value displayed by the laughing gas and air electric control flowmeter is obtained; determining a verification flow value range; if the third flow value displayed by the gas flow detection device is within the verification flow value range, it is determined that the precision of the laughing air electric control flowmeter meets the standard. Air can be used for replacing laughing gas for testing.

The invention relates to a bypass valve used in an anaesthesia machine loop. The bypass valve comprises a bypass valve body, a valve element, a main spring and a gland. The bypass valve body is in an annular groove shape, a first through hole is formed in the center of the bypass valve body in the axial direction in an extending mode, and a second through hole is further formed in the end face of the annular groove of the bypass valve body. The valve core is arranged in the first through hole; the gland is fixed at one end of the bypass valve body, a central through hole coaxial with the first through hole and another through hole aligned with the second through hole are formed in the gland, and the central through hole and the through hole are used for being communicated with corresponding vent holes in a loop main body of the anaesthesia machine respectively; a main spring is arranged between the valve element and the gland and used for elastically adjusting the distance between the valve element and the gland. The soda lime tank with the conventional volume can be adopted, when the soda lime tank is detached, a channel is formed in the bypass valve, an air path cannot be communicated with the external atmosphere, continuous ventilation can be achieved, operation is easy, and safety and reliability are achieved.

The invention relates to the field of medical apparatus and instruments, in particular to a mold loop flip mechanism integrated with an electronic APL valve and an anesthesia machine. The mold loop flip mechanism integrated with the electronic APL valve comprises a loop flip shell, a rack (2), the electronic APL valve (6), a flip assembly (3) and a flip lock (12), wherein the rack (2) is arranged on a loop shell (25) of the anaesthesia machine; the loop flip shell is used for installing the electronic APL valve (6); the overturning assembly (3) is connected with the loop flip shell and the rack (2) and used for enabling the loop flip shell to drive the electronic APL valve (6) to overturn relative to the anaesthesia machine loop; and the flip lock (12) is used for locking the loop flip shell on a loop shell (25) of the anaesthesia machine when the loop flip shell is in a flip closed state. High-temperature disinfection of the electronic APL valve (6) along with a loop of the anaesthesia machine can be avoided, and the service life of the electronic APL valve (6) is prolonged.

The present application relates to the technical field of anesthetizing machine, and discloses a method for calibrating anesthetic gas flow. The method collects real-time monitoring data of gas flow at the output end of the anesthetizing machine, which comprehensively reflects the flow state of anesthetic gas by covering the flow fluctuation curve and the pressure change sequence. Subsequently, a dynamic calibration model matched with the physical parameters of the anesthetic gas delivery pipeline is established, and the collected flow fluctuation curve and pressure change sequence are input into the model for time domain alignment to adapt to different pipeline characteristics. According to the time domain alignment result, a coupling feature vector of flow rate and pressure is extracted, which contains key information such as flow rate gradient extreme points and pressure mutation time stamps, and is used to accurately capture the gas flow change characteristics. Based on the coupling feature vector, the initial flow calibration value at the output end of the anesthetizing machine is dynamically compensated, thereby generating the calibrated gas flow reference value.

The utility model relates to the technical field of anesthesia, in particular to an inhalation type anesthesia device. Comprising an anaesthesia machine, an outlet of the anaesthesia machine is communicated with an inlet pipe of a respirator through a communicating assembly, the connecting assembly comprises a connecting pipe, one end of the connecting pipe is fixedly communicated with the outlet of the anaesthesia machine, the other end of the connecting pipe is fixedly communicated with a parent part, and a child part is detachably, fixedly and hermetically connected to the parent part and fixedly communicated with the inlet pipe. According to the device, the taper sleeves matched with the guide parts on the buckles are arranged, so that the taper sleeves move towards the buckles, the multiple buckles deform at the same time through matching of the taper sleeves and the guide parts of the buckles, separation of the child part and the mother part can be facilitated, and the respirator is convenient to disassemble.

The utility model relates to the technical field of anaesthesia machines, and provides an anaesthesia machine which comprises an anaesthesia machine body, an air supply pipe is arranged on one side of the anaesthesia machine body, an overturning medicine adding assembly is arranged on one side of the anaesthesia machine body, and an overturning locking assembly is arranged on the anaesthesia machine body. The overturning medicine adding assembly comprises an embedded groove, the embedded groove is formed in the side wall of the anesthesia machine body, a receding groove is formed in the inner side surface of the embedded groove, an overturning groove is formed in the bottom of the embedded groove, a swing frame is connected to the interior of the overturning groove through a pin shaft, a medicine adding cover is connected to the interior of the swing frame through a pin shaft, and a medicine adding pipe is arranged at the bottom of the medicine adding cover. By means of the technical scheme, the problems that in the prior art, when an anesthesia machine is used, medicine needs to be added into the anesthesia machine, in order to prevent liquid leakage, a cover body needs to be used for assisting gathering in the medicine adding process of the anesthesia machine, a common cover body container for medicine adding of the anesthesia machine is lost, and storage is troublesome are solved.

The utility model discloses an ultrasonic irradiation system for irregular parts of a mouse, and particularly relates to the technical field of experimental equipment. The ultrasonic irradiation system for the irregular part of the mouse comprises an anaesthesia machine, ultrasonic equipment and a fixing plate, a mask and an ultrasonic output positioning support are arranged on the fixing plate, the mask is connected with the anaesthesia machine through a pipeline, when the ultrasonic irradiation system is used, the mask covers the head of the mouse so that the mouse can be kept in an anesthetic state, and the ultrasonic output positioning support comprises a base. The base is nailed on the fixing plate through a plurality of nails, a stand column is fixedly arranged on the edge, close to one side, of the top of the base, the stand column is movably sleeved with a sleeve, a fixing assembly is arranged on one side of the sleeve, and the sleeve can be fixed to the stand column through the fixing assembly. The mouse irregular part ultrasonic irradiation system provided by the utility model can effectively help animal experiment research of related ultrasonic effects, thereby providing a powerful tool for fundamental research of ultrasonic treatment.

The invention discloses an interface structure for an oxygen battery sensor on an anaesthesia machine loop, which is embedded into an anaesthesia machine loop structure and comprises an oxygen battery push rod and an oxygen battery spring, the oxygen battery push rod is roughly T-shaped, a vertical rod part of the oxygen battery push rod is arranged in the inspiration valve seat in a sliding manner, and a transverse rod part of the oxygen battery push rod can be sleeved and propped against the through hole of the sealing end cover; the oxygen battery spring is sleeved outside the vertical rod part and the inspiration valve seat, one end of the oxygen battery spring is propped against the cross rod part, and the other end of the oxygen battery spring is propped against a groove in the outer side of the inspiration valve seat. The structure can be integrated into an anaesthesia machine loop, does not occupy external space, and is high in integration level, safe to use and simple to operate.

The utility model provides an anaesthesia machine loop adapter for bronchoscopy, which relates to the technical field of anaesthesia machine loop adapters for bronchoscopy and comprises an adapter, a first rotating shaft is rotatably connected to the inner wall of the adapter, a second rotating shaft is movably sleeved on the outer surface of the first rotating shaft close to the top, and the second rotating shaft is movably sleeved on the outer surface of the first rotating shaft. A first gear is fixedly connected to the outer surface, close to the top end, of the second rotating shaft, a first connecting plate is rotationally connected to the outer surface, close to the bottom end, of the first gear, and a second connecting plate is fixedly connected to the top, close to the edge of one side, of the first connecting plate. According to the device, the first baffle is driven by the first rotating shaft, the second baffle is driven by the second rotating shaft, the second rotating shaft can be driven to rotate when the first rotating shaft rotates through mutual meshing of gears, the first rotating shaft can also rotate when the second rotating shaft rotates, and the two baffles can jointly block backflow gas.

The invention belongs to the technical field of medical instruments, and particularly relates to a modular serial port communication system and an anaesthesia machine, and the system comprises a receiving module which is used for receiving data from a plurality of serial ports and storing the data to different cache queues distributed to the serial ports; the protocol analysis module is used for analyzing the circularly acquired data in the different cache queues, acquiring a destination address, a source address, an instruction code, an instruction length, instruction content, an application mark and a checksum, and checking the destination address, the source address, the instruction code, the instruction length, the instruction content, the application mark and the checksum; the application mark comprises application, forwarding and sniffing; the protocol application module is used for respectively performing application, forwarding and sniffing processing according to the application mark; and the protocol sending module is used for storing the to-be-forwarded data to a sending cache queue and sending the to-be-forwarded data through a serial port. By adopting the system, the overhead caused by error analysis can be greatly saved, the debugging is convenient, and the workload of design and maintenance is reduced.

The utility model belongs to the technical field of medical equipment, and particularly relates to a switching device and an anaesthesia machine. The switching device comprises a base, a handle, an elastic piece, a piston rod and an air channel switching block, an eccentric cam is arranged at one end of the handle, and the eccentric cam is rotationally installed on the base; one end of the elastic piece is rotationally mounted on the base, the other end of the elastic piece is connected with the handle, and the rotation axis of the elastic piece and the rotation axis of the eccentric cam are located on a first plane; a piston cavity, an air inlet, a manual interface and a mechanical control interface are formed in the air passage switching block, the piston rod is movably mounted in the piston cavity in the length direction, and the end, extending out of the piston cavity, of the piston rod is connected with the eccentric cam; the handle can overcome the elastic force of the elastic piece to rotate between a manual position and a mechanical control position so as to drive the piston rod to move through the eccentric cam, and the manual position and the mechanical control position are located on the two sides of the first plane; at the mechanical control position, the piston rod blocks the manual interface; and at the manual position, the piston rod blocks the mechanical control interface.

The invention provides an electronic waste gas module and an anaesthesia machine. The electronic waste gas module comprises a gas inlet, a valve, a gas outlet and a negative pressure source which are sequentially connected. A positive pressure sensor is arranged on the air inlet and used for monitoring air pressure of the air inlet; a negative pressure sensor is arranged on the air outlet and used for monitoring the air pressure of the air outlet; a motor and a flow sensor are arranged on the valve, the motor is used for controlling the opening-closing degree of the valve, and the flow sensor is used for monitoring exhaust flow velocity; the electronic waste gas module further comprises a control main board which is used for being connected with an upper computer, receiving setting information and uploading internal monitoring information. The controller is connected with the positive pressure sensor, the negative pressure sensor, the flow sensor and the motor and used for monitoring exhaust pressure and wind speed, and when the exhaust pressure is abnormal, the exhaust pressure is adjusted by controlling the opening and closing degree of the valve. The device has the advantages that under the condition that the pressure of the front-end air inlet is too high, the exhaust flow speed is automatically increased, and ventilation of the anaesthesia machine is prevented from being affected by insufficient exhaust capacity; a limit switch is not used, so that the cost is reduced.

The utility model relates to the technical field of ventilation masks, in particular to a child comfortable gastroscope multifunctional mask which comprises a mask body, a Y-shaped three-way butt joint pipe, a one-way air inlet valve connector, a nasal catheter connector, a one-way mask inflation valve connector, a gastroscope pipe stable access assembly and a mask air leakage prevention fixing assembly. The lower end part of the mask body is connected with a Y-shaped three-way butt joint pipe; one side of the lower end of the Y-shaped tee joint pipe is provided with a one-way air inlet valve interface; the other side is provided with a nasal catheter connector; the upper end part of the mask body is connected with a one-way mask inflation valve interface; a gastroscope tube stable access assembly is arranged in the mask body. The one-way air inlet valve connector on one side of the Y-shaped three-way butt joint pipe can be in butt joint with an anaesthesia machine to control ventilation, the nasal catheter connector on the other side of the Y-shaped three-way butt joint pipe can continuously supply oxygen to the interior of the mask body, a gastroscope tube can enter the mask body through the central ventilation connection pipe, and meanwhile the gastroscope tube can pass through the mask body. Nasal catheter oxygen uptake and anesthesia machine controlled ventilation are carried out.

The invention belongs to the technical field of medical instruments, and discloses a multi-modal intraoperative bleeding amount real-time estimation method and system, the volume proportion of blood in a mixed solution is calculated through multi-band absorbance information, and the interference of irrigation solution dilution on blood loss amount evaluation is effectively solved; the blood amount in the suction bottle is calculated by combining the weight of the mixed liquid and the suction flow, so that the accuracy of liquid amount measurement is improved; the gauze is tracked and recognized through the surgical field video, the blood content is estimated, and automatic evaluation of the blood content of the gauze is achieved; finally, the Kalman filtering algorithm is used for fusing multi-source data, the accumulated blood loss amount and blood loss rate are dynamically calculated, the real-time performance and robustness of estimation are remarkably improved, and second-level blood loss rate information can be provided. In addition, according to the method, graded warning can be carried out according to the blood loss condition, a blood transfusion pump and an anaesthesia machine are controlled in a linkage mode, and auditable logs are recorded; therefore, the accuracy, the real-time performance, the intelligent level and the traceability of intraoperative blood loss volume evaluation are comprehensively improved.

The invention discloses a pressure release valve and an anaesthesia machine. The pressure release valve comprises a valve body assembly and a valve element assembly, the valve element assembly comprises a first valve element, a second valve element and a first elastic piece, and the first elastic piece, the first valve element and the second valve element all extend in the first direction; the first valve element is in transmission connection with the valve body assembly, the second valve element is movably connected to the first valve element in the first direction, the first elastic piece is connected between the first valve element and the second valve element, and the end, away from the first valve element, of the second valve element is suitable for abutting against a to-be-decompressed piece of a main body of the anaesthesia machine. The valve body assembly is operated to drive the first valve element to reciprocate in the first direction so as to adjust the compression amount of the first elastic piece, and then the pressure of the second valve element on the piece to be decompressed is adjusted. According to the pressure release valve, the valve element assembly is designed to be in the combination form of the first valve element, the second valve element and the first elastic piece, the overall structure is simplified, the disassembly and assembly operation of the pressure release valve is greatly facilitated, and the maintenance difficulty and cost are reduced.

The invention relates to the field of medical instruments, and discloses a breathing circuit flow sensor calibration gas circuit, system and calibration method.The breathing circuit flow sensor calibration gas circuit comprises a gas source module, and a flow monitoring module, a gas switching valve, a calibration branch, an inspiration branch, an expiration branch, a manual machine control development, a mechanical ventilation driving device and a waste gas purification system which are sequentially connected with the gas source module in series; the gas source module provides calibration gas, the flow monitoring module adjusts the calibration gas into standard flow gas, the standard flow gas is sequentially conveyed to the inspiration branch and the expiration branch to complete calibration of a breathing loop flow sensor, and the standard flow calibration gas is exhausted after being purified through the waste gas purification system. A flow sensor of an original flow monitoring module of an anaesthesia machine is used as a standard flow sensor, and an original flow adjusting device and an original gas on-off device of the flow monitoring module are used for adjusting calibration gas for guaranteeing flow, so that the flow sensor of a breathing loop is calibrated; a standard flow sensor does not need to be additionally arranged or an external standard flow sensor does not need to be connected.

The invention relates to the technical field of medical gas supply and treatment, in particular to an anaesthesia machine gas path system and an anaesthesia machine, and the system comprises a gas supply module, an evaporator, a breathing loop gas path module and a driving gas path module. The gas supply module is used for supplying carrier gas, the evaporator is connected with the gas supply module, and the evaporator is used for evaporating anesthetic and mixing the evaporated anesthetic with the carrier gas to form anesthetic gas. The breathing loop air path module comprises an air bellow, the air bellow comprises a driving air bellow and a controlled air bellow, the driving air bellow is connected with the controlled air bellow, and the driving air bellow is used for extruding and stretching the controlled air bellow. The controlled air box is connected with the evaporator, and the controlled air box is used for supplying the anesthetic gas in the evaporator to a user and absorbing waste gas exhaled by the user. The driving air path module is connected with the driving air bellow and used for driving the driving air bellow to expand and contract. The device has the effect of preventing anesthesia in the breathing circuit air path module from being polluted.