STANLEY C. CHANG, MD
Anesthesiologist Assistant at Fresno St, Fresno, CA

7798957, Sep 21, 2010

Jul 31, 2006

11/496375

Stanley F. Chang - Fresno CA, US

A61B 1/04, A61B 1/00, A61M 1/00

600114, 600144, 604 27

A guide and method for tilting a colonoscope in the rectum during a colonoscopy to attain a favorable direction for advancement of the scope through the colon. The guide comprises an at least partially rigid, elongated body member that, preferably, is attached to a handle at its proximal end. The body member can have a flat or curved cross-section. One or more ring members can be provided along the length of the body member to receive the scope and maintain the guide in close abutting relation therewith. The ring members can be slotted to allow side-loading of the guide onto the scope. Alternatively, a rigid or graduated rigid tubular member can be part of the guide member. An injection port allows injection of a lubricant. By tilting the colonoscope at various difficult stages of a colonoscopy, sigmoid looping is minimized to facilitate advancing the scope through the colon.

2010028, Nov 4, 2010

Jul 15, 2010

12/837495

Stanley F. Chang - Fresno CA, US

A61B 1/00

600114

A guide and method for tilting a colonoscope in the rectum leftward toward the descending colon to advance the colonoscope through the colon during colonoscopy. The guide comprises a rigid elongated body member and a handle attached to or integral with the body member. The body member has an insertion length selected so as to not be inserted past the patient's rectum. The body member can be curved or tubular to better engage the colonoscope. A soft liner can be utilized to protect the endoscope during use. Preferably, the body member has a semi-circular cross-section with a flexible inner tubular member attached thereto that receives the endoscope. A longitudinal slot facilitates loading the endoscope into the tubular member. In another embodiment, the body member comprises upper and lower rigid body members connected by an engaging mechanism. The user tilts the colonoscope with the guide to minimize or avoid sigmoid looping.

6712755, Mar 30, 2004

Mar 15, 2002

10/099299

Stanley F. Chang - Fresno CA 93711

A61B 100

600114, 600125

A locking mechanism for an endoscopic overtube comprising a generally tubular member having a slot extending from the distal end to the proximal end of the tubular member for insertion of an endoscope into the lumen configured to slidably receive the endoscope. The overtube has a second, smaller lumen configured to receive an elongated member. The slot has an interdigitating configuration with a plurality of interlocking members that join together to close the overtube. The second lumen connects the interlocking members to receive the elongated member therein to align and securely close the slot around the endoscope in the larger lumen. The elongated member in the second lumen connects the ends of the tubular member to keep the slot closed during an endoscopic procedure. A sleeve can be used at the distal end of the overtube to maintain closure of the slot.

2003022, Nov 27, 2003

May 21, 2002

10/153358

Stanley Chang - Fresno CA, US

A61B001/12

600/156000

A method for delivering an aqueous lubricating agent into an endoscope during endoscopic procedures, such as colonoscopy. The aqueous lubricant can be prepared by mixing the standard viscous lubricants with an aqueous solution, such as water, or the solution can be supplied in a prepared diluted form. When suctioning debris particles through the channel, the aqueous lubricant can be injected into the channel to break up any clumps of particles and facilitate the suctioning of other coated particles. During an endoscopic procedure when the movement of the endoscope becomes more difficult due to friction, the aqueous lubricant can be injected into the suction/instrument channel of the endoscope to lubricate the area of the body around the distal end of the endoscope. The aqueous lubricant can also be injected into the channel to facilitate passage of medical instruments therethrough.

2005013, Jun 16, 2005

Dec 13, 2003

10/735194

Stanley Chang - Fresno CA, US

A61B018/14

606047000

An improved polypectomy snare for removing and retrieving polyps from inside an organ during an endoscopic procedure, such as the colon during a colonoscopy. The improved polypectomy snare has an outer sheath with a tip having a non-planar tip surface shaped and configured so that a cut polyp will better attach to the snare to avoid additional efforts to retrieve the polyp or the loss of the poly. The tip of the outer sheath is configured with one or more spikes having pointed ends to attach to the polyp. In a preferred configuration, the tip has a plurality of spikes extending outwardly from the tip and configured in a generally saw-toothed shape. The spikes can be integral with the outer sheath, directly attached to the outer sheath or part of a cap member that attaches to the sheath.

5941815, Aug 24, 1999

Jul 10, 1998

9/113414

Stanley F. Chang - Fresno CA

Helix Medical, Inc. - Carpinteria CA

A61B 100

600114

A splint or overtube device for use in keeping the sigmoid colon in a straightened position during endoscopy to facilitate advancement of the colonoscope or other types of medical endoscopes to the cecum. The present device utilizes an elongated member having a tight distal end or seal to close off the annular space between the endoscope and the elongated member at the distal end of the splint to prevent perforation of the colon. A hydrophilic lubricating substance can be utilized to minimize friction between the tight distal end or seal and the splint. An injection port is provided to allow the endoscope operator to inject fluid to lubricate the distal end or seal, to deflect away the colonic wall in advance of the splint and to remotely lubricate the scope distally. A second sealing member can be utilized at the proximal end of the splint to prevent loss of fluids from the splint.