Endoscope for bile duct and pancreatic duct

• US 4,979,496 A
• Filed: 04/03/1989
• Issued: 12/25/1990
• Est. Priority Date: 04/05/1988
• Status: Expired due to Term

• Current Assignee: Fuji Photo Optical Co. Ltd (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Optical Co. Ltd (Fujifilm Holdings Corporation)
• Inventors: Komi, Shuji
• Primary Examiner(s): Grieb, William H.
• Application Number:
  US07/332,859
• Time in Patent Office: 631 Days
• Field of Search: 128/4, 128/6, 128/7
• US Class Current: 600/113
• CPC Class Codes: A61B 1/015 Control of fluid supply or evacuation
• CPC Class Codes: A61B 1/018 for receiving instruments

Abstract

An endoscope for bile duct and pancreatic duct of double scope system including a mother endoscope having an insertion unit to be inserted into duodenum and a daughter endoscope having an insertion unit to be inserted via papilla through a forceps channel of the insertion unit.

The endoscope is provided with a flexible guide tube to be inserted into bile duct and pancreatic duct through a forceps channel from the insertion hole of the mother endoscope, and the insertion unit of the daughter endoscope can be inserted into this guide tube. Further, the endoscope is provided with a core bar, which is removably mounted on one end of the guide tube and is designed to be of such length that its tip does not protrude from the tip of the guide tube when it is inserted into the guide tube.

Claims

1. An endoscope for bile duct and pancreatic duct comprising a mother endoscope, and a daughter endoscope having an insertion unit, the mother endoscope having an insertion unit to be inserted into duodenum, a forceps channel in said insertion unit and an insertion hole communicating with the forceps channel,

a flexible guide tube having flexibility to be inserted into bile duct and pancreatic duct from papilla through the forceps channel from the insertion hole and into which the insertion unit of the daughter endoscope is inserted, and

a flexible core bar mounted removably on one end of and received in the guide tube, having a tip at its end remote from said one end of the guide tube and being of such length that the tip does not protrude from the tube.

2. An endoscope for bile duct and pancreatic duct, comprising a mother endoscope having an insertion unit, a daughter endoscope having an insertion unit, the mother endoscope having a forceps channel in its insertion unit and an insertion hole communicating with the forceps channel, and a flexible guide tube having a remote end to be inserted into bile duct and pancreatic duct through the forceps channel from the insertion hole of the mother endoscope, of which the insertion unit is inserted into duodenum, wherein the endoscope further comprises

a fixing tube to be mounted on the base end of the insertion unit of the daughter endoscope, and

an adaptor, respective ends of which mate with the fixing tube and the guide tube, into which an end of the insertion unit of the daughter endoscope is inserted, the other end of the insertion unit of the daughter endoscope being a free tip, wherein

the adaptor is so dimensioned that it does not fit into the guide tube and said tip of the insertion unit of the daughter endoscope is roughly aligned with the tip of the remote end of the guide tube and does not protrude therefrom when the adaptor abuts against the guide tube.

3. An endoscope for bile duct and pancreatic duct comprising

a mother endoscope and a daughter endoscope, the mother endoscope having an insertion unit to be inserted into duodenum, a forceps channel in said insertion unit and an insertion hole communicating with the forceps channel, and the daughter unit having an insertion unit for insertion into bile duct or pancreatic duct,

a flexible first guide tube to be inserted into bile duct or pancreatic duct through the forceps channel from the insertion hole of the mother endoscope,

a junction tube connected with the first guide tube,

a flexible second guide tube of diameter larger than that of the first guide tube and to be inserted into bile duct or pancreatic duct, being guided by the junction tube and the first guide tube,

a fixing tube to be mounted on the base end of the insertion unit, which is inserted into the second guide tube of the daughter endoscope,

an enclosure unit mounted on the base end of the insertion unit of the daughter endoscope to close up the gap between the fixing tube and the insertion unit of the daughter endoscope, and

an adaptor in which is provided an at least 3-way path, the adaptor comprising a straight tube and at least one cross tube communicating with the straight tube, respective ends of the straight tube of the adaptor being mounted on the second guide tube and the fixing tube after the first guide tube and the junction tube are withdrawn from the second guide tube, which has been guided by the first guide tube and has been inserted into bile duct or pancreatic duct, surgical tools such as forceps of physiological saline and the like being insertable or injectable into bile duct or pancreatic duct through the second guide tube from a said cross tube of the adaptor.

4. An endoscope for bile duct and pancreatic duct, comprising a mother endoscope having an insertion unit to be inserted into duodenum, the insertion unit being provided with a forceps channel, and a daughter endoscope having an insertion unit to be inserted into bile duct and pancreatic duct, wherein the endoscope further comprises

a plurality of alternative flexible guide tubes of different diameters for guiding the insertion unit of the daughter endoscope through the forceps channel of the mother endoscope into bile duct and pancreatic duct,

a plurality of alternative adaptors of different diameters, each of the adaptors being tubular and having opposed ends, each of the adaptors being adapted to mate at one of said opposed ends with a respective one of the guide tubes,

and a plurality of concentric fixing tubes of different diameters, each of the fixing tubes being adapted to mate with the other opposed end of a respective one of the adaptors and, thereby, through the adaptor, connect the insertion unit of the daughter endoscope to the rest of the daughter endoscope.