Thomas Lee Callahan

US Patent:

59179180, Jun 29, 1999

Filed:

Feb 21, 1997

Appl. No.:

8/803674

Inventors:

Thomas F. Callahan - Marlboro MA

Assignee:

University Research Engineers & Associates, Inc. - Grantham NH

International Classification:

A61B 704

US Classification:

381 67

Abstract:

The present invention provides an in-ear-canal audio receiver (42) comprising an in-ear-canal adapter body (96) having a tapered ear plug portion (98) that is inserted into the user's ear canal. The adapter body (96) further has an opening (104) in the plug portion, an exterior annular indent (128), and an inner chamber (92) coupled to the opening of the plug portion. The inner chamber of the in-ear-canal adapter body holds a transducer assembly (92) comprising a transducer housing (54) and a transducer or speaker (56). The transducer (56) is positioned in a passage extending through the transducer housing. A torus-shaped cushion (106) is positioned in the annular indent of the in-ear-canal adapter body (96). The cushion provides comfort and establishes a good seal with the user's ear.

US Patent:

54677750, Nov 21, 1995

Filed:

Mar 17, 1995

Appl. No.:

8/405879

Inventors:

Thomas F. Callahan - Maynard MA
Matthew G. Callahan - Ipswich MA

Assignee:

University Research Engineers & Associates - Maynard MA

International Classification:

A61B 704

US Classification:

128715

Abstract:

A modular auscultation sensor and telemetry system ("MASTS") for sensing body sounds of a patient in a noisy environment where both desired body sounds and undesirable noise may be detected. The MASTS includes a transducer head that comprises two sensors that are substantially acoustically and mechanically isolated from each other. The first sensor is positioned to sense body sounds of a patient when the transducer head is placed against a patient's skin, and the second sensor is positioned to sense primarily noise, if any. The sound signals are transmitted to a digital signal processor carried in a waist-pack or similar container. The digital signal processor processes the sound signals using an adaptive filter scheme to produce an output signal that is indicative of primarily of the body sounds emanating from the patient. A receiving device such as earphones, a hybrid noise reduction ("HNR") headset, an HNR helmet, a tape deck, or a computer may be plugged into the waist-pack and coupled to the digital signal processor to receive the output signals.

US Patent:

55787991, Nov 26, 1996

Filed:

Jun 2, 1995

Appl. No.:

8/458125

Inventors:

Thomas F. Callahan - Maynard MA
Matthew G. Callahan - Ipswich MA
Ann F. Bell - Kenosha WI

Assignee:

University Research Engineers & Ass. - Maynard MA

International Classification:

H04R 2500

US Classification:

181137

Abstract:

A disposable patient-to-transducer interface device for use in securely holding a transducer such as a stethoscope head positioned against the skin surface of a patient. The interface device may be adhered to the patient's skin surface and the stethoscope head securely received in an opening provided in the device. When in use, the interface device substantially surrounds the stethoscope head thereby providing a passive barrier to ambient noise. The interface device also develops a relatively good air seal around the stethoscope head and thus provides an additional barrier to ambient noise. Furthermore, the interface device prevents substantial movement of the transducer head and, thereby, minimizes the amount of surface motion noise generated and detected by the transducer head. In addition, when the interface device is attached to the skin surface of the patient, it establishes a good reference point whereby continual or periodic monitoring of a particular location on the patient may be accomplished.

US Patent:

51194570, Jun 2, 1992

Filed:

Aug 15, 1990

Appl. No.:

7/567796

Inventors:

Thomas F. Callahan - Maynard MA

Assignee:

University Research Engineers & Associates, Inc. - Maynard MA

International Classification:

G02B 644

US Classification:

385107

Abstract:

A cable and connector system comprises a cable having a plurality of conductors for carrying electric current. The conductors are surrounded by a plurality of aramid fiber tension members that carry tensile loads that are applied to the cable. The conductors and tension members are wrapped with an aramid fiber armor tape. The armor tape protects the bundle from crushing loads and penetration by sharp objects. A connector is provided at each end of the cable whereby the tension members of the cable may be fixedly attached to the connector such that the tensile loads carried by the tension members are directly transmitted to the connector and are not transmitted to the conductors.