Andrew C Chang

US Patent:

48416924, Jun 27, 1989

Filed:

Jan 29, 1988

Appl. No.:

7/150069

Inventors:

Donald N. Coupard - Bethesda MD
Andrew K. Chang - Potomac MD
John E. Fuller - Brookeville MD
Angelo J. Mauriello - Southampton PA

International Classification:

H05K 900
E06B 722
E06B 104

US Classification:

52173R

Abstract:

A shielded access apparatus for enabling personnel access to an enclosure which is shielded to prevent propagation of electromagnetic energy into and out of the enclosure. The apparatus includes an access enclosure of electrically conductive material and first and second openings in the enclosure. A shield is positioned in the enclosure between the first and second openings for preventing radiated electromagnetic energy passing through one of the openings from travelling along a straight line to the other opening. Absorption material lines the interior of the enclosure and absorbs radiated electromagnetic energy passing through the enclosure.

US Patent:

48235237, Apr 25, 1989

Filed:

Jan 29, 1988

Appl. No.:

7/150286

Inventors:

Donald N. Coupard - Bethesda MD
Andrew K. Chang - Potomac MD
John E. Fuller - Brookeville MD
Angelo Mauriello - Southampton PA

International Classification:

E04B 202

US Classification:

52173R

Abstract:

A shielding enclosure for preventing propagation of electromagnetic radiation into or out of the enclosure comprising a support structure and a plurality of sheets of electrically conductive material supported thereon. Each of the sheets has an edge extending therearound and a region of overlap extending inwardly of and along the edge. The region is in overlapping engagement with the region of overlap of sheets adjacent thereto on the support structure so as to define a wave guide gap. Adjacent sheets are pressed together by pressure plates at the overlapping regions to maintain a gap width through which the electromagnetic radiation cannot propagate. Shielding components used to construct a shielding enclosure are also disclosed.

US Patent:

20210401434, Dec 30, 2021

Filed:

May 17, 2021

Appl. No.:

17/322307

Inventors:

- Santa Rosa CA, US
Tasha Cheshko - Irvine CA, US
Kshitija P. Garde - Fullerton CA, US
Karl L. Olney - Irvine CA, US
Luke Lehmann - Maple Grove MN, US
Andrew Tiem-Yen Chang - Torrance CA, US
Claudia See - Irvine CA, US

Assignee:

Medtronic Vascular, Inc. - Santa Rosa CA

International Classification:

A61B 17/076

Abstract:

Aspects of the disclosure include apparatuses for and methods of removing a ligation clip interconnecting two mitral valve leaflets. Methods can include providing a mitral valve having first and second valve leaflets interconnected with a ligation clip. The ligation clip includes a base supporting a first and second retaining arms each having an end opposite the base. The first and second valve leaflets are compressed between the first and second retaining arms. The methods further include physically separating the ligation clip from both of the first and second leaflets with the apparatus, which is configured to dislodge the first and second leaflets from the ligation clip. The apparatuses are further configured to withdraw the ligation clip from the patient along with the apparatus.