초록

An improved breast pump assembly has a foot drive to which an otherwise manually operated vacuum pump of a breast pump can be readily and releasably attached to operate the vacuum pump by the foot of the user.

대표청구항 ▼

An improved breast pump assembly has a foot drive to which an otherwise manually operated vacuum pump of a breast pump can be readily and releasably attached to operate the vacuum pump by the foot of the user. ate. The end of the connector pin has lateral projections to engage within the node when b

An improved breast pump assembly has a foot drive to which an otherwise manually operated vacuum pump of a breast pump can be readily and releasably attached to operate the vacuum pump by the foot of the user. ate. The end of the connector pin has lateral projections to engage within the node when both plates are spaced apart a predetermined distance by the pressure of helical springs which are disposed about each pin and its associated node. During movement of the pin within the node the pin is in substantially friction free movement whereby not to corrupt the movement signal generated by the piezoelectric crystal. These resilient attachment members interconnect the plates together while providing flexion thereof and which have the effect of maximizing the movement signal to the piezo by reducing the shunt effect that a more rigid corner plate connection has. The resilient members may also be constituted by leaf springs formed integral with one of the plates and connected to the other. h of said at least one infrared radiation source and within each of said single pulses of electric current, causing the duration of each resulting pulse of infrared radiation expressed as the temporal extension of said period of time θ1to comply with the relation θ1>(Cρd0/2εσTm4)ΔT1 in which dois the actual physical thickness of those parts of the at least one infrared radiation source that are adapted to be heated to the higher temperature level Tm,σ=5.67·10-12Wcm-2K-4is the Stefan-Boltzmann constant, εmand ΔT1as required by means of an iterative process until θ1satisfies certain requirements of temporal resolution for said identification, measurement and/or warning. 2. The method according to claim 1, wherein temperature difference ΔT1is greater than 100° K. 3. A sensor for carrying out the method according to claim 1 for pulse-wise identification, measurement and/or warning of one or more specific gases by means of at least one pulsed, radiation-cooled infrared radiation source, comprising electrical means which are adapted to pulse-wise heating of said at least one infrared radiation source with single pulses of electric current and in any preferred sequence of time, at least one infrared detector which is adapted to the detection of pulsed infrared radiation from said at least one infrared radiation source, at least one infrared spectrally selective element that is arranged between said infrared radiation source(s) and said infrared detector(s) and is adapted to spectral selection of said infrared radiation corresponding to specific spectral characteristics of said one or more specific gases, an open or closed volume of gas that is arranged between said infrared radiation source(s) and said infrared detector(s), optical means which are arranged to guide spectrally selected infrared radiation from said infrared radiation source(s) via said at least one spectrally selective element onto said infrared detector(s) through said open or closed volume of gas, and electronic means adapted to the registration, amplification, treatment and/or presentation of such electrical signals as result when said infrared radiation is brought to illuminate said infrared detector(s) through said volume of gas via said spectrally selective element(s), wherein said at least one infrared radiation source is adapted to be operated at a certain, large and preferentially larger than 100 K temperature difference ΔT1between a lower temperature level T0and a certain higher temperature level Tm, in that the said higher temperature level Tmis maintained for a period of time θ1for each of said at least one infrared radiation source and within each of said single pulse of electric current, and in that the duration of the resulting said pulse(s) of infrared radiation expressed as said period of time θ1has been chosen in accordance with the relation θ1>(Cρd0/2εσTm4)ΔT1 in which d0is the actual physical thickness of those parts of said at least one infrared radiation source that are adapted to be heated to said higher temperature level Tm. 4. A sensor according to claim 3, wherein said electronic means which are adapted to the registration, amplification, treatment and/or presentation of said electrical signals comprise equipment that has been arranged to integrate over time such electrical signals as result from each of said at least one infrared detector inside a time interval Γ1when said at least one detector is illuminated by one or more of said at leas