Born: 9 Dec 1927 Died: 11 May 2009

Ex President Hewlett Packard, California, USA.

Son of late Eng. Luis Bismarck Dias and late Ilda Rodrigues Dias (Campal).

Husband of Frances.

Brother/brother-in-law of late Elsa/Rui Lopes (Vasco), Maria dos Anjos/late Albert Joanes (Margao), Maria de Lourdes/late Filomena Pereira (Bandra) and Maria Luiza/late Kevin Vaz (Miramar).

He was a prolific inventor. Here are some that were patented by him:

  

A direct contact scanner uses a fiber acoustic waveguide to convey ultrasound from an ultrasound transducer to a direct contact area. The waveguide extends from a main body of the scanner into an oblong nose, and terminates in a deflector. To minimize thickness of the nose, the waveguide and deflector are rotated about an ultrasound transmission axis of the waveguide, enabling the scanner to be used in a variety of situations where quarters are cramped. A coupling fluid conveys ultrasound between the deflector and a radome, which directly contacts the object to be scanned. Using the waveguide, an ultrasound transducer and supporting electronics may be distanced from the direct contact area and separated from the fluid, thereby insulating the fluid from possible electronic leakage currents and heat.
A noninvasive blood chemistry measurement method and system isolate measurement contributions due to a patient’s blood to accurately measure blood chemistry. In accordance with a first preferred embodiment of the present invention a noninvasive blood chemistry measurement method decreases the blood volume within a patient’s body part relative to the normal blood volume in the body part and performs a baseline measurement. Blood volume is then increased and a second measurement is performed. Comparison of the second measurement to the baseline measurement isolates the measurement attributes of the patient’s blood. In accordance with a second preferred embodiment of the present invention a noninvasive blood chemistry measurement system decreases blood volume by applying mechanical pressure to a body part. In accordance with a third preferred embodiment of the present invention, blood volume in the body part is decreased using a pressure cuff. In a fourth embodiment, a noninvasive probe accurately measures blood chemistry and uses a suction cup to increase blood volume at the blood chemistry measurement site.
A noninvasive blood chemistry measurement method and system isolate measurement contributions due to a patient’s blood to accurately measure blood chemistry. In accordance with a first preferred embodiment of the present invention a noninvasive blood chemistry measurement method decreases the blood volume within a patient’s body part relative to the normal blood volume in the body part and performs a baseline measurement. Blood volume is then increased and a second measurement is performed. Comparison of the second measurement to the baseline measurement isolates the measurement attributes of the patient’s blood. In accordance with a second preferred embodiment of the present invention a noninvasive blood chemistry measurement system decreases blood volume by applying mechanical pressure to a body part. In accordance with a third preferred embodiment of the present invention, blood volume in the body part is decreased using a pressure cuff. In a fourth embodiment, a noninvasive probe accurately measures blood chemistry and uses a suction cup to increase blood volume at the blood chemistry measurement site.
A system and method for coupling acoustic energy within a waveguide provides highly efficient and sensitive acoustic energy generation and detection. In particular, an ultrasound angioplasty system is described which makes use of an end-fire array of ring transducers to produce highly directionalized sound within an acoustic waveguide. The transducers can be made circularly symmetric, and may be composed of multiple segments for generating sound waves in independent x and y spatial modes within the acoustic waveguide. Each ring transducer is optimally spaced 1/2.lambda..sub.L from its neighbor transducers, such that alternate transducers transduce 180-degrees out of phase, and may have their electrical end inverted for common drive, or for summing of transducer electrical outputs when the array is used as a detector. The phased array may also be used in a resonant acoustic energy system used to detect pressure variations or reflections from a substance, for example, for detecting the progress of chemical reactions, liquid level sensing, etc., imaging, or in various other ultrasound applications.
A system and method for coupling acoustic energy within a waveguide provides highly efficient and sensitive acoustic energy generation and detection. In particular, an ultrasound angioplasty system is described which makes use of an end-fire array of ring transducers to produce highly directionalized sound within an acoustic waveguide. The transducers can be made circularly symmetric, and may be composed of multiple segments for generating sound waves in independent x and y spatial modes within the acoustic waveguide. Each ring transducer is optimally spaced 1/2.lambda..sub.L from its neighbor transducers, such that alternate transducers transduce 180-degrees out of phase, and may have their electrical end inverted for common drive, or for summing of transducer electrical outputs when the array is used as a detector. The phased array may also be used in a resonant acoustic energy system used to detect pressure variations or reflections from a substance, for example, for detecting the progress of chemical reactions, liquid level sensing, etc., imaging, or in various other ultrasound applications.
An ultrasonic probe, such as a catheter, includes an array of electroacoustic transducer elements arranged about a central region, with each element having a radiating surface directed to define a first acoustic energy path having a component of direction that is toward the central region. That is, the elements are inwardly directed. Within the central region is an acoustic reflector that reflects the acoustic energy along a second path to an object to be imaged. In another embodiment, the transducer elements are directed to project acoustic energy generally parallel to the axis of the ultrasonic probe, with the acoustic reflector providing reflection for defining an interrogation beam.
An apparatus for providing efficient transmission of a beam of acoustic wave between an ultrasonic transducer and a remotely located body under examination by the beam. The apparatus includes a housing having an interior arranged so that the ultrasonic transducer is disposed therein. A prism is acoustically coupled with the transducer and with an acoustic waveguide having a longitudinal dimension extending outwardly from the interior of the housing. The acoustic prism is fixedly coupled with a proximate portion of the waveguide so as to provide efficient transmission of the beam of acoustic waves between the prism and the waveguide. Accordingly, The beam of acoustic waves is transmitted from the transducer, through the prism, and along the longitudinal dimension of the waveguide, to a distal portion of the waveguide. The distal portion of the waveguide is inserted into a remotely located patient’s body under examination. The distal portion of the waveguide emits the ultrasonic beam, scanning the tissue of interest.
A method of forming an impedance matching layer of an acoustic transducer includes geometrically patterning impedance matching material directly onto a radiating surface of piezoelectric substrate. In one embodiment, the matching layer is deposited onto the piezoelectric substrate and photolithographic techniques are utilized to pattern the matching layer to provide posts tailored to better match the piezoelectric substrate to a medium into which acoustic waves are to be transmitted. A nominal layer of metal between the posts and the piezoelectric substrate improves the attachment of the matching material to the substrate. The nominal layer may be chrome-gold and the matching material may be copper. Typically, the radiating surface is the substrate front surface from which acoustic waves are directed into a medium of interest, e.g., water or human tissue. However, the radiating surface may be the substitute rear surface, with the patterned matching layer providing acoustic matching to a backing layer for absorbing acoustic energy. In another embodiment, matching layers of different acoustic impedances are deposited and patterned on both the front and rear surfaces to provide matching for effective transmission into the medium of interest and into an acoustic absorptive backing medium.
This invention is a magnetostriction transducer and an intraoperative probe for acoustic imaging. The magnetostriction transducer has a coil and a magnetostriction element deposited on a portion of the acoustic waveguide that is inserted inside the coil. The magnetic field of the coil threads into the magnetostriction element and, due to the alternating magnetic field, the magnetostriction element changes its length at a rate equal to the frequency of the magnetic field. These length changes excite, among others, longitudinal waves in the core of the acoustic waveguide. The intraoperative probe has an array of acoustic waveguides bonded together. Each acoustic waveguide in the intraoperative probe has a transducer, such as a magnetostriction transducer of a piezoelectric transducer, that couples acoustic signals into the acoustic waveguides. The intraoperative probe can image the body without the extra hardware needed to rotate an acoustic waveguide by stepping an acoustic beam across the aperture of the intraoperative probe. This invention has the advantage of imaging internal organs without exposing them to danger of leakage currents.
A catheter tip imaging probe varies the effective radius of resolution of an acoustic beam by translating the focal length. Varying the effective radius improves the resolution at any point of interest along the arterial walls. The focal length can be dynamically translated by deflecting either the transducer or the mirror in a conventional imaging probe.
Spherical annulus piezoelectric transducers 62, 64 and spherical disc piezoelectric transducer 66 form a spherical shell having a radius of curvature R with a focal point 70 near the end of cladded-core acoustic waveguide 72. Each transducer 62, 64, 66 generates a bulk acoustic wave of a unique frequency and transmits it to focal point 70 where it enters core 74 of cladded-core acoustic waveguide 72. Alternatively, a conical annulus piezoelectric transducers 92, 116 on a prism 90 generate bulk acoustic waves of multiple discrete frequencies and focus them through cladding 75 and into core 74 of cladded-core acoustic waveguide 72. Surface acoustic waves of multiple discrete frequencies can be generated by multiple sets of curvilinear interdigital conductors 132, 134 on a piezoelectric substrate 122. The shape of curvilinear interdigital conductors 132, 134 focuses the surface acoustic waves at focal point 70 located near the end of acoustic waveguide 72. The surface acoustic waves are converted into bulk/longitudinal waves by either curvilinear corrugations 142, 146 or by a coupling medium that causes the surface acoustic waves to become leaky longitudinal waves. Alternatively, the surface acoustic waves can be coupled to the core of the acoustic waveguide by converting them into either bulk/longitudinal waves or leaky longitudinal waves and guiding them through the cladding to the core. When the acoustic signals travel through the cladding to couple to the core, the acoustic waveguide can transmit optical signals.
(Source: www.patents.com)
And then some…
5291090 Curvilinear interleaved longitudinal-mode ultrasound transducers
An ultrasound transducer for intravascular examinations comprises an interleaved series of eccentric elliptical electrodes disposed on the back face of a piezoelectric substrate that has been alternately poled in the thickness dimension. The back face of …
03/01/1994
5284148 Intracavity ultrasound diagnostic probe using fiber acoustic waveguides
An intracavity ultrasound diagnostic probe has a fiber acoustic waveguide that guides acoustic signals generated by a piezoelectric transducer located outside the body, through a body cavity and to an imaging site within the body where they reflect back i…
02/08/1994
5271402 Turbine drive mechanism for steering ultrasound signals
An ultrasound probe includes an ultrasound emitter and a turbine. In one embodiment, the ultrasound emitter is a reflective surface which reflects ultrasound signals generated by a transmitter. The reflective surface reflects the ultrasound signals so tha…
12/21/1993
5217018 Acoustic transmission through cladded core waveguide
An Ultrasonic Catheter Guidance System which overcomes the inadequacies, dangers, and difficulties encountered by previously available medical guiding apparatus is disclosed. The present invention utilizes a novel technique for coupling ultrasonic energy …
06/08/1993
5152291 Acoustic fiber measurement of intravascular blood
One or more acoustic fiber guides are used to carry certain modes of acoustic energy to the tip of a catheter. Using these fibers, reflected sound (Doppler Sound) measurements are made in a blood environment without the risk to the patient associated with…
10/06/1992
5060653 Ultrasonic sensor with starved dilatational modes
A method and apparatus to improve the performance of an ultrasonic imaging sensor [11] is disclosed. The key to the performance improvement obtained in the present invention is in the matching of sensor element [10] size to the electrical characteristics …
10/29/1991
5025790 Graded frequency sensors
A graded frequency ultrasonic sensor [10] that compensates for frequency downshifting [32] in the body is disclosed. The outer portion [20] of the sensor’s aperture is sensitive to the lower frequency returns which are a consequence of the frequency downs…
06/25/1991
4992692 Annular array sensors
An improved annular array sensor [10] that facilitates hermetic sealing and uses optimum acoustic matching layers is disclosed. The key to the performance improvement obtained in the present invention is the method of forming the annular elements [38,40] …
02/12/1991
4482834 Acoustic imaging transducer
The acoustic imaging transducer described herein incorporates an acoustic stack contained in an alumina housing which also provides structure for electrically connecting the transducer array elements to system signal processing electronics….
11/13/1984
4384228 Acousto-electric transducer
An array of transducers is mounted on a base and means are provided for causing surface waves that emanate in opposite directions along the base to be reflected by transducers on either side so as to follow paths of respectively different lengths in going…
05/17/1983
4129242 High fidelity pressure transducer
The capacitive fluid pressure transducers described herein comprise quartz bodies and diaphragms having suitable electrodes deposited thereon to form both sensing and reference capacitors in appropriate configurations for high fidelity measurement of rela…
12/12/1978
4064550 High fidelity pressure transducer
The capacitive fluid pressure transducers described herein comprise quartz bodies and diaphragms having suitable electrodes deposited thereon to form both sensing and reference capacitors in appropriate configurations for high fidelity measurement of rela…
12/20/1977
I remember hearing anecdotes about his inventive genius even in his college days (Wadia College, Pune). He devised an alarm clock that gave you a mild electric shock, and which would intensify if you didn’t wake up the first time!
He has been a role model to several generations after him, especially in his own family.
May he rest in peace.
Comments, tributes, and further vignettes about him are welcome.
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