Hearing system with middle ear transducer mount

• US 6,315,710 B1
• Filed: 07/21/1997
• Issued: 11/13/2001
• Est. Priority Date: 07/21/1997
• Status: Expired due to Fees

• Current Assignee: Envoy Medical Corporation
• Original Assignee: St Croix Medical Incorporated
• Inventors: Kroll, Kai, Meyerson, Scott C., Bushek, Donald J.
• Primary Examiner(s): Lacyk, John P.
• Application Number:
  US08/897,851
• Time in Patent Office: 1,576 Days
• Field of Search: 600/25, 381/68-- 6, 607/136, 607/137, 607/55-56, 181/128-29
• US Class Current: 600/25
• CPC Class Codes: H04R 2225/67 Implantable hearing aids or parts thereof not covered by H04R25/606
• CPC Class Codes: H04R 25/606 acting directly on the eardrum, the ossicles or the skull, e.g. mastoid, tooth, maxillary or mandibular bone, or mechanically stimulating the cochlea, e.g. at the oval window

Abstract

An improved partial middle ear implantable (P-MEI) or total middle ear implantable (T-MEI) hearing assistance system includes a device and method of providing between a vibrating auditory element and a transducer that senses or provides such mechanical vibrations adjustably positionable contact at a controllable, adjustable, or calibrated force. A screw adjusts a spacing between first and second members of the transducer mount to position the transducer and obtain the desired coupling force between the transducer and the auditory element. A spring provides an adjustable coupling force. A spacer limits further compression of the spring, providing additional force. A calibrated coupling force is obtained by compressing the spring by a known amount, such as by observing visual demarcations, or by reducing the spacing between the first and second members until the spacing is almost limited by the length of the spacer. Optimal ranges of forces for sensing malleus vibrations are disclosed.

Claims

1. A transducer mount comprising:

a first member, proportioned for disposition in a middle ear;

a second member, proportioned for disposition in the middle ear, and movably engaging the first member; and

an elastically deformable coupler, coupled to each of the first and second members.

2. The transducer mount of claim 1, wherein the deformable coupler includes a spring.

3. The transducer mount of claim 2, wherein the spring includes a material selected from the group consisting essentially of stainless steel or silicone.

4. The transducer mount of claim 2, wherein the spring has a spring constant of approximately 250 milli-Newtons per millimeter.

5. The transducer mount of claim 2, wherein the spring is configured for providing a compressive force that is approximately between 0 and 75 milli-Newtons.

6. The transducer mount of claim 5, wherein the spring is configured for providing a compressive force that is approximately between 20 and 50 milli-Newtons.

7. The transducer mount of claim 1, wherein the second member includes a transducer.

8. The transducer mount of claim 1, further comprising a first stop, engaging the first member and the deformable coupler.

9. The transducer mount of claim 8, wherein the first stop is adjustably spaced from at least a portion of the first member.

10. The transducer mount of claim 9, further comprising a threaded member adjustably spacing the first stop from the first member.

11. The transducer mount of claim 10, wherein a spacing between adjacent threads of the threaded member is such that a desired force is obtained from compressing the deformable coupler by rotating the threaded member.

12. The transducer mount of claim 10, further comprising a receptacle, engaging the threaded member and movably engaging the first member.

13. The transducer mount of claim 12, further comprising a fastener securing the receptacle to the first member.

14. The transducer mount of claim 8, further comprising a second stop, coupled to the second member and the deformable coupler.

15. The transducer mount of claim 14, further comprising a spacer, coupled to at least one of the first and second stops, wherein the first and second stops have a spatial relationship therebetween that is limited by the spacer.

16. The transducer mount of claim 15, wherein the spacer length is adjustable.

17. The transducer mount of claim 15, wherein the spacer includes features spaced at predetermined intervals for trimming away portions of the spacer between the depressions.

18. The transducer mount of claim 1, further including demarcations indicating a force provided by the deformable coupler.

19. The transducer mount of claim 1, further comprising a fastener coupled to the first member.

20. An apparatus comprising:

a first member, proportioned for disposition in a middle ear;

a second member, proportioned for disposition in the middle ear, and threadably engaging the first member; and

a transducer, proportioned for disposition in the middle ear, and attached to the second member.

21. The apparatus of claim 20, in which the first member comprises:

a mounting portion;

an engaging portion; and

a threaded member, a portion of the threaded member captured between the mounting portion and the engaging portion.

22. The apparatus of claim 21, in which the first member further comprises:

a retainer member, attached to the mounting portion and capturing at least part of the engaging portion between the retainer member and the mounting portion; and

a fastener is configured for securing the engaging portion to the retainer member.

23. The apparatus of claim 21, in which the second member is coaxially hollowed and threaded for receiving the threaded member.

24. The apparatus of claim 23, in which the engaging portion of the first member includes a guide, and the second member includes a pin engaging the guide.

25. A hearing assistance system, comprising:

a transducer proportioned for coupling to an auditory element in a middle ear;

an electronics unit communicatively coupled to the transducer; and

a transducer mount coupled to the transducer and proportioned for securing within the middle ear, the transducer mount including;

a first member, proportioned for disposition in a middle ear;

a second member, proportioned for disposition in the middle ear, and movably engaging the first member; and

an elastically deformable coupler, coupled to each of the first and second members.

26. A hearing assistance system, comprising:

a transducer proportioned for coupling to an auditory element in a middle ear;

an electronics unit communicatively coupled to the transducer; and

a transducer mount coupled to the transducer and proportioned for securing within the middle ear, the transducer mount including;

a first member, proportioned for disposition in a middle ear; and

a second member, proportioned for disposition in the middle ear, and

threadably engaging the first member, and carrying the transducer.

27. A method of sensing mechanical vibrations of a malleus, the method comprising:

disposing a piezoelectric transducer in the middle ear;

positioning a portion of the transducer to contact the malleus; and

adjusting a force between the transducer and the malleus to be approximately between 0 milli-Newtons and 75 milli-Newtons.

28. The method of claim 27, in which the force between the transducer and the malleus is adjusted to be approximately between 0 milli-Newtons and 50 milli-Newtons.

29. The method of claim 27, in which the force between the transducer and the malleus is adjusted to be approximately between 20 milli-Newtons and 50 milli-Newtons.

30. A method of coupling a transducer to an auditory element, the method comprising:

disposing a transducer mount in a middle ear, the transducer mount including a first member and also including a second member carrying a transducer and movably engaged with the first member by an elastically deformable coupler; and

coupling the transducer to an auditory element; and

adjusting a spatial relationship between the first and second members to provide a desired coupling force between the transducer and the auditory element.

31. The method of claim 30, further comprising securing the transducer mount in the middle ear before coupling the transducer to the auditory element.

32. The method of claim 30, wherein adjusting a spatial relationship between the first and second members to provide the desired coupling force between the transducer and the auditory element includes compressing the elastically deformable coupler to obtain the desired coupling force.

33. The method of claim 30, wherein adjusting a spatial relationship between the first and second members to provide the desired coupling force between the transducer and the auditory element includes engaging the first and second members with a spacer whereby a spatial relationship between the first and second members is limited by the spacer to obtain the desired coupling force.

34. The method of claim 33, wherein engaging the first and second members limits the compression of the elastically deformable coupler.

35. A method of coupling a transducer to an auditory element, the method comprising:

disposing a transducer mount in a middle ear, the transducer mount including a first member and also including a second member carrying a transducer, and wherein the first member includes a threaded member that is threadably engaged with the second member; and

coupling the transducer to the auditory element by turning the threaded member to adjust a spatial relationship between the first and second members.