Method for fabricating a pressure-wave sensor with a leveling support element

• US 6,629,343 B1
• Filed: 10/20/2000
• Issued: 10/07/2003
• Est. Priority Date: 09/10/1999
• Status: Expired due to Fees

• Current Assignee: Hypertension Diagnostics, Inc.
• Original Assignee: Hypertension Diagnostics, Inc.
• Inventors: Lemaire, Charles A., Chesney, Charles F., Riggs, Michael Terry
• Primary Examiner(s): TUGBANG, ANTHONY D
• Application Number:
  US09/693,458
• Time in Patent Office: 1,082 Days
• Field of Search: 29/253.5, 295/94, 298/32, 310/311, 310/321, 310/324, 310/348, 310/352, 310/353, 600/485, 600/486, 600/488, 600/500, 600/561
• US Class Current: 29/25.35
• 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 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 method for fabricating a pressure-waveform sensor comprising:

providing a housing structure having an inner lip;

supporting a cantilevered piezoelectric sensor element with a support element in the housing structure such that a first end of the sensor element is secured between the support element and the housing, and a second end of the sensor element is in an orientation cantilevered from the support element; and

shimming the support element such that contact is made between the support element and the inner lip at a plurality of regions in order to level the piezoelectric element relative to the inner lip.

2. The method according to claim 1, further comprising mounting an amplifier to a face of the support element.

3. The method according to claim 1, wherein the shimming includes mounting one or more shims within the housing structure between the support element and the inner lip to level the piezoelectric element relative to the housing structure.

4. The method according to claim 1, further comprising:

providing a diaphragm on the housing structure; and

displacementally coupling the cantilevered piezoelectric sensor element to the diaphragm.

5. The method according to claim 1, wherein the cantilevered piezoelectric sensor element contacts the inner lip at a single one of the plurality of regions.

6. The method according to claim 5, wherein the one or more shims are cylindrical in shape.

7. The method according to claim 1, wherein the cantilevered piezoelectric sensor element contacts the inner lip at a single one of the plurality of regions and wherein the shimming provides only a single shim that contacts the inner lip at a single one of the plurality of regions.

8. The method according to claim 1, wherein the cantilevered piezoelectric sensor element contacts the inner lip at a single one of the plurality of regions and wherein the shimming provides one or more shims that contact the inner lip at a plurality of the plurality of regions.

9. The method according to claim 1, wherein the one or more shims each have a thickness substantially equal to a thickness of the piezoelectric sensor element.

10. The method according to 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.

11. The method according to claim 10, wherein the ring further comprises wire leveler elements mounted in a second and a third of the slots to provide two of the support regions.

12. The method according to claim 11, wherein the support element comprises a first face region for attaching to the first end of the piezoelectric element, a second face region elevated relative to the first face region to provide one or more of the plurality of support regions.

13. The method according to claim 12, wherein the support regions of the second face region are integral to the support element.

14. A method for fabricating a pressure-waveform sensor comprising:

providing a housing structure having an inner lip;

supporting a cantilevered piezoelectric sensor element with a support element in the housing structure such that a first end of the sensor element is secured between the support element and the housing, and a second end of the sensor element is in an orientation cantilevered from the support element; and

shimming the support element such that contact is made between the support element and the inner lip at a plurality of regions in order to level the piezoelectric element relative to the inner lip,

wherein the support element is a ring, the method further comprising;

mounting the piezoelectric sensor element in a first slot of the support element ring; and

mounting one or more shims in a second and a third slot of the support element ring.

15. A method for fabricating a pressure-waveform sensor comprising:

providing a housing structure having an inner lip; and

supporting a cantilevered piezoelectric sensor element with a support element, that further includes one or more support regions, in the housing structure such that a first end of the sensor element is secured between the support element and the housing, and a second end of the sensor element is in an orientation cantilevered from the support element; and

supporting the support element such that contact is made between the support regions of the support element and the inner lip at a plurality of areas in order to level the piezoelectric element relative to the inner lip.

16. The method according to claim 15, wherein the support regions of the support element and the piezoelectric element are coplanar.

17. The method according to claim 15, further comprising

securing a post to the cantilevered piezoelectric element; wherein the support regions of the support element and the piezoelectric element are coplanar and wherein the post extends through the plane of the support regions.

18. The method according to claim 15, further comprising:

mounting an amplifier secured to a surface of the support element by epoxy.

19. A method of fabricating a pressure-waveform sensor comprising:

providing a piezoelectric sensor element;

providing a support element having one or more raised support regions; and

mounting the piezoelectric sensor element to the support element in a cantilevered configuration such that a first end of the sensor element is secured between the support element and the housing, and a second end of the sensor element is in an orientation cantilevered from the support element, wherein a face of the mounted piezoelectric element is substantially coplanar with the one or more raised support regions.

20. The method according to claim 19, further comprising:

providing a housing having an inner lip and a diaphragm, wherein a plane of the diaphragm and a plane of the inner lip are parallel, and a plane of the sensor element and the one or more support regions and the plane of the inner lip are coplanar; and

mounting the support element within the housing such that a portion of the face of the piezoelectric element is in contact with the inner lip and the one or more raised support regions are in contact with the inner lip.

21. The method according to claim 20, further comprising:

mounting an amplifier to the support element opposite the piezoelectric element.

22. The method according to claim 19, wherein the one or more raised support regions are formed on the support element before the piezoelectric element is mounted.