76 results about "Cuff inflation" patented technology

A method and system for operating a non-invasive blood pressure monitor that utilizes an SpO₂ plethysmograph signal to determine the initial inflation pressure for the blood pressure cuff of the NIBP monitor. A pulse sensor is placed on the patient's limb distal to the blood pressure cuff such that as the blood pressure cuff is inflated, the pulse signals from the pulse sensor will be reduced. When the blood pressure cuff reaches systolic pressure, the pulse signals from the pulse sensor will be initially attenuated and eventually eliminated, thus providing an indication that the cuff pressure has reached systolic pressure for the patient. The central processor of the NIBP monitor compares the pulse signals during cuff inflation to an average pulse signal and terminates the inflation of the blood pressure cuff upon sufficient attenuation. The use of the SpO₂ plethysmograph signal to determine the initial inflation pressure reduces both the over-inflation of the blood pressure cuff and the under-inflation of the blood pressure cuff which increases the rate at which the blood pressure measurement can be made while increasing patient comfort.

A method is provided for blood pressure measurement by means of an inflatable cuff (50) applied to a limb of a vertebrate and pneumatically coupled to a first port (112A) and a second port (112B) of a blood pressure measurement apparatus (100). A pump (160) coupled to the second port inflates the cuff pneumatically. During an initial cuff inflation period, a first pressure sensor (180) pneumatically coupled to the first port senses a first pressure and a second pressure sensor (182) pneumatically coupled to the second port senses a second pressure. An analysis module (142) compares the magnitude of the first pressure to the magnitude of the second pressure to determine the relative relationship between the respective magnitudes of the first pressure and the second pressure. The relative relationship between these pressure may be used to determine whether a single lumen or dual lumen cuff is use, to determine whether the blood pressure measurement procedure selected is correct for the cuff actually in use, or to automatically select the proper blood pressure measurement procedure to be used for the actual cuff in use.

An inflation system (10, 110, 120, 130) for a balloon catheter assembly (12) includes an inflation tube (22), the first end of which is connectable to an inflation fluid reservoir (24, 30) and the second end of which is connectable to and opens into an inflatable cuff (20) on a main catheter (14) of the balloon catheter assembly, to permit the fluid reservoir to be in fluid communication with the cuff. A fluid reservoir is connectable to the inflation tube and is fillable with cuff inflation fluid only to a predetermined, fixed volume, to thereby permit no more than such volume of fluid to be transferred from the reservoir to the cuff during use of the system, to prevent over-inflation of the cuff and thereby avoid potential trauma to the patient.

A method of operating a blood pressure measurement system that utilizes a non-invasive blood pressure (NIBP) monitor having a blood pressure cuff. During operation of the NIBP monitor, the blood pressure cuff is initially inflated. During the initial inflation, at least one pressure transducer monitors for the presence of oscillometric pulses and creates an oscillation signal. The oscillation signal is filtered and provided to a central processor. The central processor monitors for oscillometric pulses within the filtered signal and estimates a diastolic pressure and a systolic pressure for the patient. The estimated systolic and diastolic measurements taken during the initial inflation of the blood pressure cuff are used by the central processor to set a target inflation pressure and control the deflation of the blood pressure cuff from the initial inflation pressure.

A laryngeal airway device, having an airway tube which has an internal passage in the airway tube wall for receiving a cuff inflation line, and a dome having an inlet and an outlet, where the dome is connected at its inlet with the distal end of the airway tube. The device also includes an annular spoon-shaped inflatable cuff connected with the periphery of the outlet of the dome; a cuff inflation line configured to be in fluid communication with the internal space of the cuff; and a multi-lobed aperture formed in the dome. The aperture is configured to be in fluid communication with the proximal end of the airway tube. The dome has protrusions forming the multi-lobed aperture, such that a flap is configured to prevent the obstruction of the aperture by a patient's epiglottis when the device is inserted into the patient.

Under- and overinflation of retention balloons and cuffs for catheters including Foley catheters, and for endotracheal tubes, tracheostomy tubes, laryngeal mask airways and similar devices is correlated with hospital acquired infections and with patient injury. In this patent, a solution that correctly inflates inflatable retention devices is taught, whereby a pressure release means is incorporated into the inflation pathway from the fluid input syringe to the retention means while inflating. This pressure release means can be set to open at or near the optimal fluid pressure so that overinflation can be prevented by releasing any pressure above the optimal pressure and underinflation can be prevented by a user pressurizing the cuff until the valve is noticed to open. As well, observation of fluid leaked through the pressure relief means can indicate misplacement of the retention means, allowing the user to reposition it before patient injury occurs. The invention is presented as a standalone part and in a format whereby the invention is integrated into existing airway cuff inflation designs.

This invention provides a method and device for inflating a cuff of a non-invasive blood pressure measurement apparatus. The method comprises: obtaining a plurality of pressure values of the cuff at a plurality of time points; calculating a first inflation speed parameter on the basis of the plurality of pressure values, a plurality of target pressure values of the cuff at the plurality of time points and a plurality of inflation speed parameters corresponding to each time interval between every two adjacent time points of the plurality of time points; and inflating the cuff at a speed corresponding to the first inflation speed parameter from a last time point of the plurality of time points to a first time point after the plurality of time points. In this way, uniform cuff inflation can be achieved when the target pressure values of the cuff change uniformly, so that the over-voltage phenomenon or the condition of low-speed cuff inflation can be reduced or eliminated. In addition, by introducing the plurality of pressure values, even if there is a big error in a cuff pressure value obtained at a certain time point, it is still possible to control the cuff inflation correctly.

A sensor-equipped endotracheal tube has a flexible body surrounding an airway lumen and includes sensors for monitoring physiological parameters such as CO₂/O₂ concentration in respiratory gases, and patient body temperature. These sensors provide electrical output for parameter display on suitable ventilators and monitors. In another specific embodiment, the endotracheal tube includes a sensor for measuring pressure exerted between an inflation cuff and a patient's tracheal tissues for preventing injury from over/under cuff inflation. Other specific embodiments of the sensor equipped endotracheal tube include combining sensors with a heating member for warming inhaled respiratory gases, and with ultrasound reflecting elements that make the tube visible within the body using ultrasound.

The invention discloses a nondestructive testing device for coronary heart disease risk indexes.The device comprises a data processing module which is connected with a multichannel synchronous A/D conversion module.The multichannel synchronous A/D conversion module is connected with a heart sound signal detection module, an electrocardiosignal detection module and a four-limb cuff inflation and deflation module.The multichannel synchronous A/D conversion module converts a heart sound signal detected by the heart sound signal detection module, an electrocardiosignal detected by the electrocardiosignal detection module and a cuff pressure signal detected by the four-limb cuff inflation and deflation module and then transmits the converted signals to the data processing module for construction of relaxation period heart sound signal amplitude sequences before and after pressurization on the four limbs respectively, wherein the heart sound signal, the electrocardiosignal and the cuff pressure signal are collected synchronously; the data processing module obtains heart noise evaluation indexes of relaxation period heart sounds before and after pressurization on the four limbs according to the obtained heart sound signal amplitude sequences, and finally the coronary heart disease risk indexes are obtained.

The invention discloses an adjustable sphygmomanometer cuff with rulers, which comprises an outer cuff and a built-in inflating airbag. The long edge and the wide edge at the periphery of the cuff are respectively provided with a ruler; the built-in inflating airbag consists of 13 independent inflating airbags with the length of 250mm; and one end of each inflating airbag is communicated with a horizontal inflating channel, while the other end is a blind end. An intersection part of the inflating channel and each inflating airbag has a ball bag structure in which a small entity ball is arranged, and the small entity ball can move along the inflating channel under the action of external force to block the inflating airbag and adjust the total width of the inflating airbag. Six ball bag structures are arranged at the position of 150-250mm of each inflating airbag, and small entity balls are arranged in the ball bag structures, can move along the inflating airbag under the action of external force to adjust the length of the inflating airbag. The rulers of the cuff measure the length of the upper arm and the arm circumference of a testee, the width and length of the inflating airbags required by the cuff are calculated, and the width and length of the cuff are adjusted by moving the small balls in the inflating channel and the inflating airbags so as to meet the requirements of clinical different individuals on blood pressure measurement.

The invention provides a non-invasive monitoring device and method for beat-to-beat arterial blood pressure. The device comprises a cuff, a gas charging and discharging control module, a static pressure control module, a gas discharging control module, a pressure sensor and a signal processing module. The static pressure control module is used for controlling the cuff to be charged with gas to a set value, then constant gas charging is kept without discharging, and the signal processing module is used for processing collected pressure pulse wave signals to determine monitored blood pressure signals. According to the monitoring method, the average mean arterial pressure (MAP) and pulse pressure (PP) of a monitored person are obtained by the signal processing module according to the collected pressure pulse wave signals in the gas discharging process of the gas charging and discharging control module. Filtering and base line removing are performed on the pressure pulse wave signals which are collected under the condition that the static pressure control module performs constant gas charging, then linear amplification is performed on the pressure pulse wave signals through the PP, and base line correction is performed on the pressure pulse wave signals through the MAP. Changes of the beat-to-beat blood pressure can be reflected, and the real pulse waveform characteristics can be reflected.

A device for non-invasive measurement of blood pressure includes a blood pressure cuff, a plethysmographic electrode for acquiring an impedance plethysmogram distal to the cuff and a processing device to inflate and deflate the cuff generate the impedance plethysmogram and to determine the systolic and diastolic blood pressures. The device can be used to measure systolic or diastolic blood pressure or both. It can also be used to take ankle-brachial measurements. An autocorrelation technique can be used to correct noise.

An ultrasound observable endotracheal tube, according to a specific embodiment of the present invention, has a flexible body surrounding an airway lumen and includes an ultrasound-reflecting element making the tube visible within the body using ultrasound. In another specific embodiment, an endotracheal tube includes a heating member used for warming inhaled respiratory gases. Another specific embodiment of an endotracheal tube includes a sensor for measuring pressure exerted between an inflation cuff and a patient's tracheal tissues for preventing injury from over/under cuff inflation. Yet another specific embodiment of an endotracheal tube includes a sensor for measuring a CO₂ concentration in exhaled respiratory gases, and an alternative embodiment includes a sensor for measuring an O₂ concentration in respiratory gases. Other specific embodiments of the endotracheal tube combine the elements of ultrasound reflectivity, respiratory gas warming, inflatable cuff pressure sensing, CO₂ monitoring and O₂ monitoring in novel ways.

A subglottic suctioning system with a tracheal tube (10) having a ventilation lumen, a cuff inflation lumen (14), and a suction lumen (16) are disclosed which may help reduce the incidence of ventilator associated (or acquired) pneumonia. The suction lumen communicates with the space in the trachea above the cuff (22) where secretions accumulate. The suction lumen has a valve (36) on the proximal end for connection to a source of vacuum. The valve is adapted to interrupt the supply of vacuum to the suction lumen to allow for the introduction of a rinsing fluid in its place and to automatically re-establish the connection to the source of vacuum upon completion of rinsing. The rinsing fluid aids in maintaining an open suction lumen and may include medicaments and mucolytic agents to enhance or promote healing or to alter the properties of the mucus to make removal easier. The user may easily and repeatedly alternate suction and rinsing fluid through the suction lumen, i.e., the user may 'pulse' the line to loosen, break up and remove secretions and deposits that may partially or completely block or clog the suction lumen.

In blood pressure measurement of a vertebrate through use of an inflatable pressure cuff disposed about a limb of the vertebrate limb and inflated by pump driven by a motor, the air pressure within the cuff is determined at any given time during the inflation of the cuff by calculating the incremental change in pressure in the pressure cuff over a series of small time increments and summing the calculated incremental pressure changes from the initiation of cuff inflation to a desired point in time during the inflation of the pressure cuff. The incremental change in pressure within the cuff is calculated as a function of the incremental change in current drawn by the pump motor over the time increment.