|Publication number||US3440314 A|
|Publication date||Apr 22, 1969|
|Filing date||Sep 30, 1966|
|Priority date||Sep 30, 1966|
|Publication number||US 3440314 A, US 3440314A, US-A-3440314, US3440314 A, US3440314A|
|Inventors||Eldon E Frisch|
|Original Assignee||Dow Corning|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (5), Referenced by (76), Classifications (14)|
|External Links: USPTO, USPTO Assignment, Espacenet|
April 22, 1969 E. E. FRISCH 3,440,314
METHOD OF MAKING CUSTOM-FITTED EARPLUGS FOR HEARING AIDS Filed Sept. 50, 1966 INVENTOR- E/a an E. Fr'llsc/v HTTORNEY United States Patent 3,440,314 METHOD OF MAKING CUSTOM-FITTED EAR- PLUGS FOR HEARING AIDS Eldon E. Frisch, Midland, Mich., assignor to Dow Corning Corporation, Midland, Mich., a corporation of Michigan Filed Sept. 30, 1966, Ser. No. 583,166 Int. Cl. A61f 11/00; B28b 7/28, 7/16 US. Cl. 264-222 3 Claims ABSTRACT OF THE DISCLOSURE This invention relates to the manufacture of customfitted earplugs for supporting the receiver of a conventional hearing aid in the ear and more particularly to improved methods of forming such devices.
It is now a common practice in the hearing aid art to provide plugs which fit into the ear of the wearer to provide a more eflicient auditory connection between the amplifier and the inner ear. Earlier devices of this type utilized receiver-holding ear plugs of substantially uniform shape to conform to the ear of the average wearer. These plugs, in general, were ill fitting and generally unsatisfactory.
The next step in the art was the obvious one of attempting to custom fit the earplug to the ear of the individual to whom the hearing aid was being fitted. Earlier devices of this sort where made by forming a negative cast of the ear canal and molding a plug from the negative cast. This method, however, while forming reasonably well-fitted plugs, was time consuming and required a high degree of skill.
A still further step forward in the art was the provision of curable resins which, in effect, made the negative cast useful as a plug. The plug could be drilled to provide the necessary auditory connection through the plug. One disadvantage of the resinous materials was the fact that some heat was usually generated by the material as it cured. The heat was quite often uncomfortable to the patient. A further problem was the fact that the resinous material was quite hard and, in general, was uncomfortable when worn in place in the ear. Due to curvatures sometimes encountered in the ear canal, the rigid materials were also difficult to insert and remove and problems in drilling an auditory path through the plug were encountered.
There is described in U.S. Patent No. 2,910,980 an ear protector formed in situ from a room-temperature curing silicone rubber composition. This device was aimed at protecting the ear from irritating noises and, in general, to act as an acoustic guard. The ear protector was flexible and, therefore, could be easily inserted into the ear and removed. The silicone rubber material, however, was difficult to bore through to provide a satisfactory auditory passage.
It is a primary object of the present invention to provide a method of making custom-fitted earplugs for hearing aids which eliminates the problem set forth hereinabove.
3,440,314 Patented Apr. 22, 1969 ICC A further object is to provide a resilient earplug which has a continuous auditory path therethrough.
In accordance with these and other objects there 15 provided by the present invention a novel method for making a custom-fitted earplug for a hearing aid which is similar in many respects to the ear protector descrlbed in the aforementioned US. Patent No. 2,910,980, but which has a smooth tube through the center thereof to form an open auditory passage through the plug.
Other objects and attendant advantages of the present invention will become obvious to those skilled in the art from a consideration of the following detailed description when read in conjunction with the accompanying drawings wherein:
FIG. 1 is a cross-sectional view illustrating the method of forming the earplug of the present invention.
FIG. 2 is a cross-sectional view similar to FIG. 1 showing the complete earplug in place in the ear canal.
Referring now to the drawings wherein like reference characters represent like parts in both figures, there 18 shown in FIG. 1 a fragmentary view of a persons head 11 and showing the ear canal 12 and tympanic membrane or ear drum 13. Since the tympanic membrane 13 is a very sensitive and easily damaged organ, the first step in the process of forming a hearing aid plug in accordance with the present invention is inserting into the ear canal a body 14 of protective material such as cotton or other fibrous material. There is next inserted into the ear canal a length of tubing 15, which in actual embodiment of the invention was a silicone rubber tube having a 0.037 inch internal diameter. If desired, the tubing 15 may be of other suitable plastic or elastomeric materials.
Inserted into the end of the tube 15, which is inserted into the ear canal, there is preferably placed a small plug 1.6, also of silicone rubber, polyurethane foam, or the like, and which has a circular flange corresponding in diameter to the approximate diameter of the ear canal. If desired, the body 14 of protective material can be glued or sewed to the inner end of the tubing prior to insertion. A semidigid reinforcing member 17 which may, for example, be a length of metallic material such as solder is inserted into the flexible tube 15 until it is in contact with the plug 16. The flange on the plug 16 acts as a centering device for the tube in the ear and the semirigid reinforcing member 17 may be bent to conform approximately to the shape of the ear canal to keep the tube approximately centered therein. The end of the reinforcing member 17 which projects from the tube 15 is preferably extended in the proper direction to fit into the external portion of the hearing aid and a sufiicient length of tubing 15 may be provided to reach the hearing aid connection of a hearing aid worn, for example, on the temple of an eyeglass frame. If a thermoplastic tubing is utilized, the tubing after being bent to the desired shape and reinforced in that shape may be heated and then allowed to cool whereupon the shape will be retained without further reinforcement.
With the fit of the flexible tube adjusted and held in place by use of the reinforcing member 17 a quantity of curable, nonslumping, conformable material is injected around the tube 15 in a quantity suflicient to substantially fill the ear canal as far as the protective material 14; and preferably, a small amount of the material 18 extends against the surface of the outer ear. Depending upon the materials chosen, suitable primers to aid bonding between the tube and the curable material may be utilized. If desired, a receiver ring 19 for connection with the external hearing aid may be slipped over the tubing and embedded in the curable material 18 at the surface thereof. A preferred material for this use is a room-temperature curing silicone rubber, such as that described, for
3 example, in U.S. Patent No. 2,927,907 although other similar materials may also be used.
After the curable material 18 has set, the assembly may be removed from the ear. The inner end of the material including the plug 16 is cut off back far enough 'to expose the open end of the tubing and the reinforcing member 17 is removed from the tubing. The outside surface of the device may be contoured for cosmetic purposes and the inner end of the assembly is preferably rounded off. These operations ma be carried out by use of a sharp cutting instrument and/or a small grinder. If the plug is to be used with a hearing aid receiver of the type where no attaching ring is required, no exterior portion need be provided and the entire plug may be inserted into the ear canal.
The resultant device may be simply and without discomfort inserted into and removed from the ear canal. The inner surface of the tube is unbroken and forms a continuous sound track from the amplifier into the ear. Nothing is lost by irregular curves or attaching devices. If desired, a venting tube may also be provided through the structure in like manner to provide air pressure equalization. A perfect fit is obtained since the plug is custom molded to the ear of the individual with no distortion of the delicate membranes. The close fit besides providing physical comfort to the wearer also aids in preventing feedback.
Obviously, many modifications and variations of the invention will become obvious to those skilled in the art from the above teachings. It is, therefore, to be understood that within the scope of the'appended claims the invention may be practiced otherwise than as specifically described.
1. A method of forming a custom-fitted earplug for 'a hearing aid, comprising:
inserting into the ear canal a body of protective material adapted to prevent damage to the ear drum, providing a length of flexible tubing having an exterior diameter substantially smaller than that of the ear canal, inserting a plug having an external portion of a diameter approximately that of the ear canal into one end of said tubing,
inserting said tubing into the ear canal until said plug is substantially adjacent to said protective material, whereby said plug causes said tubing to be centrally spaced from the inner wall of the ear canal,
inserting into said tubing a semirigid reinforcing member adapted to prevent the collapse of said tubing and to conform said tubing to the shape of the ear canal to keep said tubing centered therein,
injecting into said ear canal a sufficient quantity of curable, nonslumping, conformable material to surround said tubing and substantially fill a portion of the ear canal as far as said protective material, allowing said material to cure,
removing the cured material and said protective material from the ear, and
removing said plug and said reinforcing member from said cured material.
2. A method as defined in claim 1 wherein said flexible tubing is silicone rubber, said reinforcing member is metallic, and said conformable material is a room-temperature curing silicone rubber.
3. A method as defined in claim 1 wherein said flexible tubing is thermoplastic and further including the step of heat-setting said tubing in its desired configuration prior to injecting said conformable material.
References Cited UNITED STATES PATENTS 1,755,775 4/1930 Dunn 264-222 2,910,980 11/1959 Stewart 128152 3,097,059 7/1963 Hoffman o 264222 3,131,241 4/1964 Mendelson 128-151 3,344,220 9/1967 Cook 264-222 JULIUS FROME, Primary Examiner.
T. MORRIS, Assistant Examiner.
U.S. Cl. X.R. 128-151
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US1755775 *||Mar 13, 1923||Apr 22, 1930||Andrew C Dunn||Earpiece|
|US2910980 *||May 20, 1957||Nov 3, 1959||Dow Chemical Co||Ear protector|
|US3097059 *||Jun 23, 1960||Jul 9, 1963||Carl G Hoffman||Method for forming ear plugs for supporting hearing and receivers|
|US3131241 *||Mar 26, 1962||Apr 28, 1964||Mendelson Emanuel S||Method for making an improved ear plug|
|US3344220 *||Apr 4, 1966||Sep 26, 1967||Process of making a hearing aid having a foamed supportive structure formed in situ|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3966871 *||Nov 19, 1974||Jun 29, 1976||Kraftwerk Union Aktiengesellschaft||Method and apparatus for inspecting tubular cavities|
|US4007249 *||Jul 15, 1974||Feb 8, 1977||The Franklin Institute Research Laboratories||Method of forming a removable cervical cap|
|US4091067 *||Jul 25, 1973||May 23, 1978||Marion Health & Safety, Inc.||Process for producing an aural communications receiving device|
|US4143657 *||May 19, 1977||Mar 13, 1979||Hidetaka Takeda||Earplug|
|US4372904 *||Mar 27, 1981||Feb 8, 1983||Gunn Dennis L||Method for making an ear plug|
|US4800636 *||Nov 19, 1986||Jan 31, 1989||Topholm & Westermann Aps||Process for manufacturing an in-the-ear canal hearing aid|
|US4828777 *||May 13, 1987||May 9, 1989||Siemens Aktiengesellschaft||Method and apparatus for the manufacture of an otoplastic shell|
|US4834927 *||May 13, 1987||May 30, 1989||Siemens Aktiengesellschaft||Method and apparatus for producing an ear impression|
|US5008058 *||Jan 19, 1989||Apr 16, 1991||Siemens Aktiengesellschaft||Method for manufacturing an otoplastic or an ear adaptor member|
|US5107861 *||Dec 10, 1990||Apr 28, 1992||Lillian Narboni||Safe ear clean button and protection with attachment device|
|US5146051 *||Jul 16, 1990||Sep 8, 1992||Siemens Aktiengesellschaft||Housing shell for an in-the-ear hearing aid|
|US5321757 *||May 20, 1992||Jun 14, 1994||Minnesota Mining And Manufacturing Company||Hearing aid and method for preparing same|
|US5333622 *||Jul 17, 1992||Aug 2, 1994||The Center For Innovative Technology||Earplug and hearing devices formed in-situ|
|US5440082 *||Sep 10, 1992||Aug 8, 1995||U.S. Philips Corporation||Method of manufacturing an in-the-ear hearing aid, auxiliary tool for use in the method, and ear mould and hearing aid manufactured in accordance with the method|
|US5455994 *||Nov 9, 1993||Oct 10, 1995||U.S. Philips Corporation||Method of manufacturing an in-the-ear hearing aid|
|US5804109 *||Nov 8, 1996||Sep 8, 1998||Resound Corporation||Method of producing an ear canal impression|
|US6339648||Mar 23, 2000||Jan 15, 2002||Sonomax (Sft) Inc||In-ear system|
|US7362875||Apr 2, 2004||Apr 22, 2008||Sonic Innovations, Inc.||Balloon-expandable hearing device fitting system and self-expanding hearing device|
|US7668325||May 3, 2005||Feb 23, 2010||Earlens Corporation||Hearing system having an open chamber for housing components and reducing the occlusion effect|
|US7715572||Feb 3, 2006||May 11, 2010||Solomito Jr Joe A||Custom-fit hearing device kit and method of use|
|US7867160||Oct 11, 2005||Jan 11, 2011||Earlens Corporation||Systems and methods for photo-mechanical hearing transduction|
|US7875223 *||Jan 24, 2008||Jan 25, 2011||Siemens Hearing Instruments, Inc.||Fabrication of a soft-silicone cover for a hearing instrument shell|
|US8184838||Mar 19, 2010||May 22, 2012||Radians, Inc.||Custom-fit hearing device kit and method of use|
|US8295523||Oct 2, 2008||Oct 23, 2012||SoundBeam LLC||Energy delivery and microphone placement methods for improved comfort in an open canal hearing aid|
|US8376967||Apr 13, 2010||Feb 19, 2013||Audiodontics, Llc||System and method for measuring and recording skull vibration in situ|
|US8385577 *||Apr 12, 2007||Feb 26, 2013||Siemens Audiologische Technik Gmbh||Fixing a sound tube in a hearing apparatus|
|US8396239||Jun 17, 2009||Mar 12, 2013||Earlens Corporation||Optical electro-mechanical hearing devices with combined power and signal architectures|
|US8401212||Oct 14, 2008||Mar 19, 2013||Earlens Corporation||Multifunction system and method for integrated hearing and communication with noise cancellation and feedback management|
|US8401214||Jun 18, 2010||Mar 19, 2013||Earlens Corporation||Eardrum implantable devices for hearing systems and methods|
|US8413663||Feb 4, 2011||Apr 9, 2013||Moldex Metric, Inc.||Push-in type of earplug with improved insertion stem|
|US8465685 *||Feb 23, 2010||Jun 18, 2013||Ola ÷quist||Device for taking impression of an ear|
|US8622885||Feb 19, 2010||Jan 7, 2014||Audiodontics, Llc||Methods and apparatus for aligning antennas of low-powered intra- and extra-oral electronic wireless devices|
|US8696541||Dec 3, 2010||Apr 15, 2014||Earlens Corporation||Systems and methods for photo-mechanical hearing transduction|
|US8715152||Jun 17, 2009||May 6, 2014||Earlens Corporation||Optical electro-mechanical hearing devices with separate power and signal components|
|US8715153||Jun 22, 2010||May 6, 2014||Earlens Corporation||Optically coupled bone conduction systems and methods|
|US8715154||Jun 24, 2010||May 6, 2014||Earlens Corporation||Optically coupled cochlear actuator systems and methods|
|US8787609||Feb 19, 2013||Jul 22, 2014||Earlens Corporation||Eardrum implantable devices for hearing systems and methods|
|US8824715||Nov 16, 2012||Sep 2, 2014||Earlens Corporation||Optical electro-mechanical hearing devices with combined power and signal architectures|
|US8845705||Jun 24, 2010||Sep 30, 2014||Earlens Corporation||Optical cochlear stimulation devices and methods|
|US8986187||Mar 18, 2014||Mar 24, 2015||Earlens Corporation||Optically coupled cochlear actuator systems and methods|
|US9049528||Jul 24, 2014||Jun 2, 2015||Earlens Corporation||Optical electro-mechanical hearing devices with combined power and signal architectures|
|US9055379||Jun 7, 2010||Jun 9, 2015||Earlens Corporation||Optically coupled acoustic middle ear implant systems and methods|
|US9154891||Jan 7, 2010||Oct 6, 2015||Earlens Corporation||Hearing system having improved high frequency response|
|US9226083||Feb 15, 2013||Dec 29, 2015||Earlens Corporation||Multifunction system and method for integrated hearing and communication with noise cancellation and feedback management|
|US9277335||Jun 10, 2014||Mar 1, 2016||Earlens Corporation||Eardrum implantable devices for hearing systems and methods|
|US9301061||Jan 18, 2013||Mar 29, 2016||Audiodontics, Llc||System and method for measuring and recording skull vibration in situ|
|US9392377||Jun 17, 2013||Jul 12, 2016||Earlens Corporation||Anatomically customized ear canal hearing apparatus|
|US9544700||Jun 14, 2010||Jan 10, 2017||Earlens Corporation||Optically coupled active ossicular replacement prosthesis|
|US9591409||Jan 5, 2016||Mar 7, 2017||Earlens Corporation||Optical electro-mechanical hearing devices with separate power and signal components|
|US20040105563 *||Feb 15, 2002||Jun 3, 2004||Bordewijk Lourens George||Method for the production of a hearing aid support and auxiliary part|
|US20040258263 *||Apr 2, 2004||Dec 23, 2004||Sonic Innovations, Inc., A Delaware Corporation||Balloon-expandable hearing device fitting system and self-expanding hearing device|
|US20050211254 *||Mar 23, 2004||Sep 29, 2005||Olson Mark A||Method and apparatus for forming ear and nose plugs|
|US20060177082 *||Feb 3, 2006||Aug 10, 2006||Solomito Joe A Jr||Custom-fit hearing device kit and method of use|
|US20060189841 *||Oct 11, 2005||Aug 24, 2006||Vincent Pluvinage||Systems and methods for photo-mechanical hearing transduction|
|US20060251278 *||May 3, 2005||Nov 9, 2006||Rodney Perkins And Associates||Hearing system having improved high frequency response|
|US20080037812 *||Apr 12, 2007||Feb 14, 2008||Siemens Audiologische Technik Gmbh||Fixing a sound tube in a hearing apparatus|
|US20080051804 *||Sep 20, 2007||Feb 28, 2008||Cottler Shayn P||Tube, stent and collar insertion device|
|US20080316864 *||Jun 23, 2008||Dec 25, 2008||Source Of Sound Ltd.||Spring based fine acoustic waveguide|
|US20090092271 *||Oct 2, 2008||Apr 9, 2009||Earlens Corporation||Energy Delivery and Microphone Placement Methods for Improved Comfort in an Open Canal Hearing Aid|
|US20090097681 *||Oct 14, 2008||Apr 16, 2009||Earlens Corporation||Multifunction System and Method for Integrated Hearing and Communication with Noise Cancellation and Feedback Management|
|US20090189313 *||Jan 24, 2008||Jul 30, 2009||Siemens Hearing Instruments, Inc.||Fabrication of a Soft-Silicone Cover for a Hearing Instrument Shell|
|US20100048982 *||Jun 17, 2009||Feb 25, 2010||Earlens Corporation||Optical Electro-Mechanical Hearing Devices With Separate Power and Signal Components|
|US20100202645 *||Jan 7, 2010||Aug 12, 2010||Earlens Corporation||Hearing system having improved high frequency response|
|US20100243513 *||Mar 19, 2010||Sep 30, 2010||Insight Concepts, LLC||Custom-fit hearing device kit and method of use|
|US20100312040 *||Jun 7, 2010||Dec 9, 2010||SoundBeam LLC||Optically Coupled Acoustic Middle Ear Implant Systems and Methods|
|US20100317914 *||Jun 14, 2010||Dec 16, 2010||SoundBeam LLC||Optically Coupled Active Ossicular Replacement Prosthesis|
|US20110077453 *||Dec 3, 2010||Mar 31, 2011||Earlens Corporation||Systems and Methods For Photo-Mechanical Hearing Transduction|
|US20110142274 *||Jun 18, 2010||Jun 16, 2011||SoundBeam LLC||Eardrum Implantable Devices For Hearing Systems and Methods|
|US20110144719 *||Jun 18, 2010||Jun 16, 2011||SoundBeam LLC||Optically Coupled Cochlear Implant Systems and Methods|
|US20110291320 *||Feb 23, 2010||Dec 1, 2011||Oequist Ola||Device for taking impression of an ear|
|EP0245741A1 *||May 4, 1987||Nov 19, 1987||Siemens Aktiengesellschaft||Method and device for making an ear impression and transforming the ear impression into a ear mould|
|EP0245742A1 *||May 4, 1987||Nov 19, 1987||Siemens Audiologische Technik GmbH||Method and device for making an ear mould|
|EP0533258A2 *||Sep 11, 1992||Mar 24, 1993||Philips Electronics N.V.||Method of manufacturing an in-the-ear hearing aid, auxiliary tool for use in the method, and ear mould and hearing aid manufactured in accordance with the method|
|EP0533258A3 *||Sep 11, 1992||Nov 18, 1993||Koninkl Philips Electronics Nv||Method of manufacturing an in-the-ear hearing aid, auxiliary tool for use in the method, and ear mould and hearing aid manufactured in accordance with the method|
|WO2016045709A1 *||Sep 23, 2014||Mar 31, 2016||Sonova Ag||An impression-taking pad, a method of impression-taking, an impression, a method of manufacturing a custom ear canal shell, a custom ear canal shell and a hearing device|
|WO2016045906A1 *||Aug 27, 2015||Mar 31, 2016||Sonova Ag||An impression-taking pad and a method for taking an impression of an ear canal|
|U.S. Classification||264/222, 128/864, 381/322, 181/130, 381/328|
|International Classification||H04R25/00, A61F11/00|
|Cooperative Classification||H04R25/608, H04R25/658, H04R25/652|
|European Classification||H04R25/65B, H04R25/65M, H04R25/60M, A61F11/00|