Medical diagnostic ultrasound transducer and method of manufacture
First Claim
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1. A medical ultrasound transducer comprising:
- a first piezomaterial body having a first thickness that is substantially less than either of first and second distances along first and second lateral dimensions, respectively, the first and second distances defining a first area;
a second piezomaterial body having a second thickness that is substantially less than either of third and fourth distances along the first and second lateral dimensions, respectively, the third and fourth distances defining a second area; and
an acoustically attenuative backing material adjacent the first and second piezomaterial bodies;
wherein a first lateral edge of the first piezomaterial body is adjacent a second lateral edge of the second piezomaterial body, a lateral area of the adjacent first and second adjacent piezomaterial bodies greater than either of the first and second areas, the first and second peizomaterial bodies forming a one dimensional array of elements, the lateral area being rectangular.
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Abstract
A plurality of piezomaterial bodies, such as panels or slices, are merged together to form a larger piezomaterial body. For example, a 0.75×22 cm polycrystalline piezomaterial body is formed, where the distances are along lateral or footprint dimensions. The thickness of the piezomaterial body is substantially less than either of the distances along first and second lateral dimensions that define the footprint. Preferably, each piezomaterial body has a panel shape, and a plurality of panels are merged to form a large multi-panel.
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Citations
60 Claims
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1. A medical ultrasound transducer comprising:
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a first piezomaterial body having a first thickness that is substantially less than either of first and second distances along first and second lateral dimensions, respectively, the first and second distances defining a first area;
a second piezomaterial body having a second thickness that is substantially less than either of third and fourth distances along the first and second lateral dimensions, respectively, the third and fourth distances defining a second area; and
an acoustically attenuative backing material adjacent the first and second piezomaterial bodies;
wherein a first lateral edge of the first piezomaterial body is adjacent a second lateral edge of the second piezomaterial body, a lateral area of the adjacent first and second adjacent piezomaterial bodies greater than either of the first and second areas, the first and second peizomaterial bodies forming a one dimensional array of elements, the lateral area being rectangular. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A medical ultrasound transducer comprising:
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a multi-panel of piezomaterial comprising;
at least first and second abutted panels comprising a one dimensional array of elements, the at least first and second abutted panels having a combined rectangular area, each of the first and second abutted panels associated with two or more elements of the one dimensional array; and
a backing material side and a matching layer side, the backing material side comprising first and second abutted panel sides of the first and second panels, respectively, the matching layer side comprising third and fourth abutted panel sides of the first and second panels, respectively;
an acoustically attenuative backing material adjacent the backing material side; and
at least one matching layer adjacent the matching layer side. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
the first panel comprises a first thickness that is substantially less than either of first and second distances along first and second lateral dimensions, respectively; and
the second panel comprises a second thickness that is substantially less than either of third and fourth distances along the first and second lateral dimensions, respectively.
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29. The transducer of claim 27 wherein at least the first panel comprises moncrystalline piezomaterial.
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30. The transducer of claim 27 wherein the multi-panel comprises polycrystalline piezomaterial and a lateral dimension of the multi-panel is greater than 15 cm.
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31. The transducer of claim 30 wherein a second lateral dimension is less than 1 cm.
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32. The transducer of claim 27 wherein at least the first panel comprises moncrystalline piezomaterial.
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33. The transducer of claim 27 wherein a kerf in the first panel have a lesser width than a distance between the first and second panels.
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34. The transducer of claim 27 wherein a kerf in the first panel is associated with two substantially parallel edges, and abutting edges of the first and second panels are divergent.
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35. The transducer of claim 27 wherein the first panel comprises a composition different than the second panel.
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36. The transducer of claim 27 wherein at least two separate electrodes connect to the first panel and at least two electrodes connect to the second panel.
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37. The transducer of claim 27 wherein at least two electrodes contact at least two respective piezoelements in said first panel.
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38. The transducer of claim 27 wherein at least the first panel has enhanced harmonic performance provided by one of variable thickness and monocrystalline piezomaterial.
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39. A medical ultrasound transducer comprising;
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an acoustically attenuative backing material;
at least one matching layer; and
a monocrystalline piezomaterial element comprising at least 2 cm2 area on a matching layer side;
wherein the piezomaterial element is laminated between the backing material and the at least one matching layer. - View Dependent Claims (40, 41)
the piezomaterial element comprises at least first and second piezomaterial bodies;
the first piezomaterial body comprises a first thickness that is substantially less than either of first and second distances along first and second lateral dimensions, respectively, the first and second distances defining a first area that is less than or equal to 1 cm2; and
the second piezomaterial body comprises a second thickness that is substantially less than either of third and fourth distances along the first and second lateral dimensions, respectively, the third and fourth distances defining a second area that is less than or equal to 1 cm2.
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42. A method of manufacturing a medical ultrasound transducer, the method comprising the steps of:
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(a) providing at least first and second panels of piezomaterial;
(b) abutting the at least first and second panels of piezomaterial, the abutted at least first and second panels comprising a laterally extended multi-panel of a one dimensional array of elements, the laterally extended multi-panel being rectangular; and
(c) mating the multi-panel with an acoustically attenuative backing material and at least one matching layer. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
further comprising step (d) of attaching the at least first and second panels to a matching layer; and
wherein step (c) comprises mating the multi-panel and the matching layer to at least the acoustically attenuative backing material.
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49. The method of claim 48 wherein the at least first and second panels are bonded to the matching layer.
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50. The method of claim 42 wherein step (b) is performed as part of step (c).
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51. The method of claim 50 wherein step (b) comprises placing the at least first and second panels on a carrier tape before step (c).
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52. The method of claim 43 wherein step (b) comprises abutting the at least first and second composited panels so that kerfs on the first panel are at an angle between 0 and 90 degrees to kerfs on the second panel.
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53. The method of claim 43 wherein step (b) comprises abutting the at least first and second composited panels so that kerfs on the first panel are parallel to kerfs on the second panel.
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54. The method of claim 42 wherein step (c) comprises providing the multipanel comprising as a monocrystalline piezomaterial and comprising a matching layer surface area of at least 2 cm2.
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55. The method of claim 42 wherein step (a) comprises providing the at least first and second panels as monocrystalline piezomaterial.
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56. The method of claim 42 further comprising step (e) of providing at least two electrodes on the first panel and at least two electrodes on the second panel.
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57. The method of claim 42 wherein the ultrasound transducer has enhanced harmonic performance contributed by at least one of monocrystalline PZT and variables thickness in at least one piezomaterial panel.
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58. The method of claim 42 wherein at least one panel comprises at least two electrically addressable piezoelements.
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59. A medical ultrasound transducer comprising:
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a first piezomaterial body having a first thickness that is substantially less than either of first and second distances along first and second lateral dimensions, respectively, the first and second distances defining a first area;
a second piezomaterial body having a second thickness that is substantially less than either of third and fourth distances along the first and second lateral dimensions, respectively, the third and fourth distances defining a second area;
an acoustically attenuative backing material adjacent the first and second piezomaterial bodies; and
wherein a first lateral edge of the first piezomaterial body is adjacent a second lateral edge of the second piezomaterial body, a lateral area of the adjacent first and second adjacent piezomaterial bodies greater than either of the first and second areas, the first and second peizomaterial bodies forming an array absent intersection with another array.
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60. A medical ultrasound transducer comprising:
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a first monocrystalline piezomaterial body having a first thickness that is substantially less than either of first and second distances along first and second lateral dimensions, respectively, the first and second distances defining a first area;
a second monocrystalline piezomaterial body having a second thickness that is substantially less than either of third and fourth distances along the first and second lateral dimensions, respectively, the third and fourth distances defining a second area; and
an acoustically attenuative backing material adjacent the first and second piezomaterial bodies;
wherein a first lateral edge of the first piezomaterial body is adjacent a second lateral edge of the second piezomaterial body, a lateral area of the adjacent first and second adjacent piezomaterial bodies greater than either of the first and second areas and greater than 2 cm2.
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Specification