Pressure-wave sensor with a leveling support element

• US 6,585,659 B1
• Filed: 10/20/2000
• Issued: 07/01/2003
• Est. Priority Date: 09/10/1999
• Status: Expired due to Fees

• Current Assignee: Hypertension Diagnostics, Inc.
• Original Assignee: Hypertension Diagnostics, Inc.
• Inventors: Riggs, Michael Terry, Lemaire, Charles A., Chesney, Charles F.
• Primary Examiner(s): Nasser, Robert L.
• Application Number:
  US09/693,460
• Time in Patent Office: 984 Days
• Field of Search: 400/485, 400/486, 400/500, 400/503, 400/561
• US Class Current: 600/485
• CPC Class Codes: A61B 2562/0247 Pressure sensors
• CPC Class Codes: A61B 2562/12 Manufacturing methods specially adapted for producing sensors for in-vivo measurements
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/0285 Measuring or recording phase velocity of blood waves
• CPC Class Codes: G01L 19/142 Multiple part housings
• CPC Class Codes: G01L 19/147 Details about the mounting of the sensor to support or covering means
• CPC Class Codes: G01L 9/008 using piezoelectric devices piezoelectric resonators G01L9/0022; surface acoustic waves G01L9/0025
• CPC Class Codes: Y10T 29/42 Piezoelectric device making
• CPC Class Codes: Y10T 29/49005 Acoustic transducer
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.

Abstract

A method and an apparatus for fabricating a pressure-waveform sensor with a leveling support element. One embodiment provides a pressure-waveform sensor having a housing, a support element, and a piezoelectric element having a first end secured between the support element and the housing, and a second end in a cantilevered orientation. The support element and the piezoelectric element together form a plurality of support regions to level the piezoelectric element and relative to the housing. In some embodiments, the support element includes a ring having three slots spaced apart on one face of the ring, or one or more support regions formed with a shim having a thickness equal to a thickness of the piezoelectric device, or support regions that are integral to the support element. Another aspect provides a method for fabricating a pressure-waveform sensor. The method includes the steps of forming a housing structure with an inner lip, and supporting a cantilevered piezoelectric element with a support structure such that contact is made with the inner lip at a plurality of points in order to level the piezoelectric element relative to the inner lip.

Claims

1. A pressure-waveform sensor comprising:

a support element;

a cantilevered piezoelectric element mounted to the support element to provide a first support region; and

means for leveling the support element.

2. The sensor of claim 1, wherein the support element comprises a ring, the ring including a plurality of slots spaced apart on one face of the ring, and having the piezoelectric element mounted to a first one of the slots, and a shim in a second one of the slots.

3. The sensor of claim 1, further comprising:

a housing structure having an inner lip and a diaphragm, wherein the support element is mounted within the housing structure with the support regions supported on the lip, and wherein the cantilevered piezoelectric element is displacementally coupled to the diaphragm.

4. A pressure-waveform sensor comprising:

a support element;

a cantilevered piezoelectric element mounted to the support element to provide a first support region; and

means for providing one or more further support regions to the support element, further comprising one or more leveler elements in one or more slots to provide the one or more further support regions.

5. A pressure-waveform sensor comprising:

a support element;

a cantilevered piezoelectric element mounted to the support element to provide a first support region; and

means for providing one or more further support regions to the support element, wherein the further support regions are integral to the support element.

6. A pressure-waveform sensor comprising:

a support element;

a cantilevered piezoelectric element mounted to the support element to provide a first support region; and

means for providing one or more further support regions to the support element, wherein the one or more support regions are constructed using a shim, and wherein the shim contacts the inner lip at a single area.

7. A pressure-waveform sensor comprising:

a support element;

a cantilevered piezoelectric element mounted to the support element to provide a first support region; and

means for providing one or more further support regions to the support element, wherein the one or more support regions are constructed using one or more shims, and wherein the one or more shims contact the inner lip at a plurality of separated areas.

8. The sensor of claim 7, wherein the one or more shims each have a thickness substantially equal to a thickness of the piezoelectric device.

9. The sensor of claim 7, wherein the one or more shims are cylindrical in shape.

10. A pressure-waveform sensor comprising:

a support element;

a cantilevered piezoelectric element mounted to the support element to provide a first support region; and

means for providing one or more further support regions to the support element, wherein the support element comprises a ring, the ring including a plurality of slots spaced apart on one face of the ring, and having the piezoelectric element mounted to a first one of the slots, and

wherein the ring further comprises leveler elements mounted in a second and a third of the slots to provide the further support regions.

11. A pressure-waveform sensor comprising:

a support element;

a cantilevered piezoelectric element mounted to the support element to provide a first support region; and

means for providing one or more further support regions to the support element, wherein the support element has a first face comprising

a first face region attached the first end of the piezoelectric element, an end portion of a face of the piezoelectric element forming the first support region, and

a second face region elevated relative to the first face region to provide one or more of the further support regions.

12. The sensor of claim 11, wherein the further support regions of the second face region are of the same material as the support element and integral to the support element.

13. A pressure-waveform sensor comprising:

a housing having an inner lip and a diaphragm;

a support element;

a cantilevered piezoelectric element mounted to the support element to provide a first support region located on a face of the piezoelectric element, wherein the support element includes one or more further support regions substantially coplanar with the face of the piezoelectric element at the first support region and wherein the support element is mounted within the housing with the first support region and the one or more further support regions in contact with the inner lip of the housing; and

a post extending from the piezoelectric element to beyond the support regions to contact the diaphragm.

14. A pressure-waveform sensor comprising:

a housing having an inner lip and a diaphragm;

a support element;

a cantilevered piezoelectric element mounted to the support element to provide a first support region located on a face of the piezoelectric element, wherein the support element includes one or more further support regions substantially coplanar with the face of the piezoelectric element at the first support region and wherein the support element is mounted within the housing with the first support region and the one or more further support regions in contact with the inner lip of the housing; and

a post extending from the piezoelectric element to beyond the support regions to contact the diaphragm,

further comprising one or more leveler elements in one or more slots to provide the one or more further support regions.

15. A pressure-waveform sensor comprising:

a housing having an inner lip and a diaphragm;

a support element;

a cantilevered piezoelectric element mounted to the support element to provide a first support region located on a face of the piezoelectric element, wherein the support element includes one or more further support regions substantially coplanar with the face of the piezoelectric element at the first support region and wherein the support element is mounted within the housing with the first support region and the one or more further support regions in contact with the inner lip of the housing; and

a post extending from the piezoelectric element to beyond the support regions to contact the diaphragm, further wherein the further support regions are integral to the support element.

16. A pressure-waveform sensor comprising:

a housing having an inner lip and a diaphragm;

a support element;

a cantilevered piezoelectric element mounted to the support element to provide a first support region located on a face of the piezoelectric element, wherein the support element includes one or more further support regions substantially coplanar with the face of the piezoelectric element at the first support region and wherein the support element is mounted within the housing with the first support region and the one or more further support regions in contact with the inner lip of the housing; and

a post extending from the piezoelectric element to beyond the support regions to contact the diaphragm, wherein the one or more support regions are constructed using a shim, and wherein the shim contacts the inner lip at a single area.

17. A pressure-waveform sensor comprising:

a housing having an inner lip and a diaphragm;

a support element;

a cantilevered piezoelectric element mounted to the support element to provide a first support region located on a face of the piezoelectric element, wherein the support element includes one or more further support regions substantially coplanar with the face of the piezoelectric element at the first support region and wherein the support element is mounted within the housing with the first support region and the one or more further support regions in contact with the inner lip of the housing; and

a post extending from the piezoelectric element to beyond the support regions to contact the diaphragm, wherein the one or more support regions are constructed using one or more shims, and wherein the one or more shims contact the inner lip at a plurality of separated areas.

18. A pressure-waveform sensor comprising:

support element in a ring shape having a plurality of slots on a face of the support element;

a shim mounted in each of one or more of the plurality of slots to provide one or more support regions; and

a cantilevered piezoelectric element mounted to the support element to provide a further support region coplanar to the one or more support regions.

19. The sensor of claim 18, wherein the support regions of the support element and a face of the piezoelectric element are coplanar.

20. The sensor of claim 18, further comprising:

a housing structure having an inner lip and a diaphragm, wherein the support element is attached to the housing such that the support regions contact the inner lip within the housing such that a face of the cantilevered piezoelectric element is substantially parallel to and displacementally coupled to the diaphragm; and

an amplifier mounted to the support element.

21. The sensor of claim 20, wherein the cantilevered piezoelectric element contacts the inner lip at a single region.

22. The sensor of claim 19, further comprising a post secured to the cantilevered piezoelectric element;

wherein the support regions of the support element and a face of the piezoelectric element are substantially coplanar and wherein the post extends through the plane of the support regions.

23. The sensor of claim 18, wherein the cantilevered piezoelectric element and the shim mounted in each of the one or more of the plurality of slots are of equal thicknesses.