Preliminary Research Concerning Measurements οf the POLVAD Blood Chamber Volume Based οn Helmholtz's Acoustic Resonator Principle

Konieczny, Grzegorz; Opilski, Z.; Pustelny, T.

doi:10.12693/aphyspola.120.688

Cited by 11 publications

(5 citation statements)

References 12 publications

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“…Also common are distance measurement techniques, in which IR LED diodes, lasers [1217], or acoustic sensors [18] are used. The distance is then determined based on measurements: the distance of the laser beam parallel to the optical axis of the camera from the centre of the recorded image [15], the time it takes the laser beam to reach and arrive back or the sound to/from an object [12,13,1820], the characteristics of light traveling in an optical ber woven into the structure of the observed and deforming material [16], laser beam intensity or the IR reected from the surface of the object [21].…”

Section: Introductionmentioning

confidence: 99%

Method of Measuring the Distance to an Object Based on One Shot Obtained from a Motionless Camera with a Fixed-Focus Lens

Murawski

2015

Acta Phys. Pol. A

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The paper presents the method of measuring the distance to the object based on digital image processing. The solution is characterized in that the distance measurement to the object is performed by a motionless camera with established and unchanged parameters during measurement. The camera is equipped with a one non-stereoscopic lens. The measured distance is determined on the basis of one view of an object presented on one image. The image is made at a constant and invariant setting of the optical path such as: focus, aperture and focal length.

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Section: Introductionmentioning

confidence: 99%

Method of Measuring the Distance to an Object Based on One Shot Obtained from a Motionless Camera with a Fixed-Focus Lens

Murawski

2015

Acta Phys. Pol. A

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“…The parameters of the membrane displacement are determined then by measuring other physical quantities. For this reason attempts are made to use bre pressure sensors [4,5], piezofoils [3], the Helmholtz resonator [6] and optical sensors [79]. When the dimensions of the sensor do not impose significant limitations, uorescence videogrammetry [10] can be used as well as the method described in [11].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Membrane Displacement Using a Motionless Camera

Murawski

2015

Acta Phys. Pol. A

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The paper presents a technique for measuring membrane displacements with one motionless camera. The method relies on measuring the distance to an object based on one image obtained from a motionless camera with a xed-focus lens. It is proven that the used technique allows monitoring the frequency and amplitude of vibration. The tests were performed for the oscillation frequency in the range from 0.5 Hz to 6 Hz and deviations from the neutral position in the range of ±3 mm.

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“…In that case both volumes ought to be considered [9]. In Figure 2b the application of the theory in the POLVAD-EXT prosthesis is presented.…”

Section: Introductionmentioning

confidence: 99%

“…If resonator’s volume and the volume outside the resonator are comparable in size, the system is treated as two resonators, sharing a common neck (Figure 2 a). In that case both volumes ought to be considered [ 9 ]. In Figure 2 b the application of the theory in the POLVAD-EXT prosthesis is presented.…”

Section: Introductionmentioning

confidence: 99%

Acoustic system for the estimation of the temporary blood chamber volume of the POLVAD heart supporting prosthesis

Konieczny

Opilski

Pustelny

et al. 2012

BioMedical Engineering OnLine

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BackgroundThe paper presents a newly researched acoustic system for blood volume measurements for the developed family of Polish ventricular assist devices. The pneumatic heart-supporting devices are still the preferred solution in some cases, and monitoring of their operation, especially the temporary blood volume, is yet to be solved.MethodsThe prototype of the POLVAD-EXT prosthesis developed by the Foundation of Cardiac Surgery Development, Zabrze, Poland, is equipped with the newly researched acoustic blood volume measurement system based on the principle of Helmholtz’s acoustic resonance. The results of static volume measurements acquired using the acoustic sensor were verified by measuring the volume of the liquid filling the prosthesis. Dynamic measurements were conducted on the hybrid model of the human cardiovascular system at the Foundation, with the Transonic T410 (11PLX transducer - 5% uncertainty) ultrasound flow rate sensor, used as the reference.ResultsThe statistical analysis of a series of static tests have proved that the sensor solution provides blood volume measurement results with uncertainties (understood as a standard mean deviation) of less than 10%. Dynamic tests show a high correlation between the results of the acoustic system and those obtained by flow rate measurements using an ultrasound transit time type sensor.ConclusionsThe results show that noninvasive, online temporary blood volume measurements in the POLVAD-EXT prosthesis, making use of the newly developed acoustic system, provides accurate static and dynamic measurements results. Conducted research provides the preliminary view on the possibility of reducing the additional sensor chamber volume in future.

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Preliminary Research Concerning Measurements οf the POLVAD Blood Chamber Volume Based οn Helmholtz's Acoustic Resonator Principle

Cited by 11 publications

References 12 publications

Method of Measuring the Distance to an Object Based on One Shot Obtained from a Motionless Camera with a Fixed-Focus Lens

Method of Measuring the Distance to an Object Based on One Shot Obtained from a Motionless Camera with a Fixed-Focus Lens

Measurement of Membrane Displacement Using a Motionless Camera

Acoustic system for the estimation of the temporary blood chamber volume of the POLVAD heart supporting prosthesis

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