Abstract: A hexacene derivative is described, being expressed by formula (1): wherein X1-X6 denote the presence or absence of a carbonyl bridge [—C(?O)—], with a proviso that at least one of X1-X6 is a carbonyl bridge while any six-member ring absent of a carbonyl bridge is aromatic. A method for forming hexacene is also described, including: thermally treating the hexacene derivative to expel volatile units of CO from the hexacene derivative.

Abstract: A catheter with a valve is disclosed that allows smooth flow of a solution in-both when a solution is flowing from the inside of a catheter towards the outside of a catheter and when a solution is flowing from the outside of a catheter towards the inside of a catheter. The catheter includes a tubular body 12 made of an elastic and flexible synthetic resin material and is equipped with a valve having a slit 16 passing through the outer surface 12b of the tubular body. The catheter is also provided with the movable wall 15 sunken towards the inside of the tubular body 12 at an end tip member region 14 of the tubular body 12. The location where the movable wall 15 exists has a structure with differences in hardness in the thickness direction of the tubular body 12.

Abstract: A fistula catheter which allows a supply tube to be easily connected to a body-external fixing member positioned on the body surface side, and which is only slightly invasive for a patient is provided. The fistula catheter 10 includes a tube body 11 which is inserted into a fistula formed in the abdominal wall and the wall of the alimentary canal; a body-external fixing part 12 which is linked to one end of the tube body 11 and positioned on the abdominal wall surface side of the fistula; and a body-internal fixing part 13 which is linked to the other end of the tube body 11 and positioned inside the wall of the alimentary canal. The body-internal fixing part 13, and the fistula catheter has a flow path allowing fluid to flow through the body-external and body-internal fixing members. The body-external fixing part 12 includes a flexible tube 1 and is connected substantially at right-angles to the axial direction of the tube body 11.

Abstract: A hexacene derivative is described, being expressed by formula (1): wherein X1-X6 denote the presence or absence of a carbonyl bridge [—C(?O)—], with a proviso that at least one of X1-X6 is a carbonyl bridge while any six-member ring absent of a carbonyl bridge is aromatic. A method for forming hexacene is also described, including: thermally treating the hexacene derivative to expel volatile units of CO from the hexacene derivative.

Abstract: A gastrostomy tube extension device which can facilitate the insertion or removal operation in and from the patient, and increase the simplicity of manufacture. A gastrostomy tube extension device for inserting or taking out the gastrostomy tube into/from the patient includes a rod, a fixing member, and an engaging member. The rod is formed of a rod-shaped member with engaging stepped portions. The fixing member is capable of moving along the longitudinal direction of the rod, and an engaging projection which can be fixed to the tube member is formed on the peripheral surface of the fixing member. The engaging member includes a lower engaging portion engageable with the engaging projection and an upper engaging portion which is engageable with the engaging stepped portion This assembly allows the extension to be locked.

Abstract: A catheter with a valve is disclosed that allows smooth flow of a solution when a solution is flowing from the inside of a catheter towards the outside of a catheter and when a solution is flowing from the outside of a catheter towards the inside of a catheter. The catheter includes a tubular body 12 made of an elastic and flexible synthetic resin material and is equipped with a valve having a slit 16 passing through the outer surface 12b of the tubular body. The catheter is also provided with the movable wall 15 sunken towards the inside of the tubular body 12 at an end tip member region 14 of the tubular body 12. The location where the movable wall 15 exists has a structure with differences in hardness in the thickness direction of the tubular body 12.

Abstract: A gastrostomy tube extension device which can facilitate the insertion or removal operation in and from the patient, and increase the simplicity of manufacture. A gastrostomy tube extension device for inserting or taking out the gastrostomy tube into/from the patient includes a rod, a fixing member, and an engaging member. The rod is formed of a rod-shaped member with engaging stepped portions. The fixing member is capable of moving along the longitudinal direction of the rod, and an engaging projection which can be fixed to the tube member is formed on the peripheral surface of the fixing member. The engaging member includes a lower engaging portion engageable with the engaging projection and an upper engaging portion which is engageable with the engaging stepped portion This assembly allows the extension to be locked.

Abstract: A stylet is provided which makes it possible to improve the handling of a catheter while also facilitating insertion of the catheter. A catheter set having such a stylet is also provided. A stylet with a hole and a stylet without a hole include, respectively: a stylet main body; an engaging part; a film-like linking part for linking the stylet main body and the engaging part; and a soft tip end part which is provided at a tip end of the engaging part. The engaging part has a tapered tubular shape which can expand and contract thanks to an alternating arrangement of soft parts and rigid parts in the peripheral direction. The stylet main body is then pulled rearwards from a state in which the stylet with a hole and the stylet without a hole are assembled with a catheter, thereby enabling the engaging part, which can engage with the edge of the opening of the catheter, to contract in the radial direction and be withdrawn.

Abstract: A gastrostomy tube extension device used for inserting or taking out the gastrostomy tube into/from the hole on the patient includes a rod, a fixing member, and an engaging member. The rod is formed of a rod-shaped member, and may be formed with engaging stepped portions on the proximal portion thereof. The fixing member is adapted to be capable of moving along the longitudinal direction of the rod, and an engaging projection which can be fixed to the tube member is formed on the peripheral surface of the fixing member. The engaging member includes a lower engaging portion engageable with the engaging projection and an upper engaging portion which is engageable with the engaging stepped portion. This assembly allows the extension to be locked, allowing the operator to manipulate the device with a single hand.

Abstract: A fistula catheter which allows a supply tube to be easily connected to a body-external fixing member positioned on the body surface side, and which is only slightly invasive for a patient is provided. The fistula catheter 10 includes a tube body 11 which is inserted into a fistula formed in the abdominal wall and the wall of the alimentary canal; a body-external fixing part 12 which is linked to one end of the tube body 11 and positioned on the abdominal wall surface side of the fistula; and a body-internal fixing part 13 which is linked to the other end of the tube body 11 and positioned inside the wall of the alimentary canal. The body-internal fixing part 13, and the fistula catheter has a flow path allowing fluid to flow through the body-external and body-internal fixing members. The body-external fixing part 12 includes a flexible tube 1 and is connected substantially at right-angles to the axial direction of the tube body 11.

Abstract: A fluid flow detector includes a detector main body defining a fluid flow channel having a fluid flow detection channel positioned adjacent an upstream hole and a discharge channel positioned adjacent a downstream hole. A mobile body is positioned within the fluid flow channel and dimensioned to be movable along the fluid flow channel. The diameter of the fluid flow detection channel is smaller than the diameter of the discharge channel, and the maximum diameter of the outer peripheral edge part of the face of the fluid flow channel orthogonal to the direction of movement of the mobile body is slightly smaller than the diameter of the fluid flow detection channel. The upstream hole and the downstream hole are formed with a size and shape such that fluid can flow through the upstream and downstream holes without being obstructed by the mobile body.

Abstract: An endoscope cover fixing device to reliably fix a cover to an endoscope without associated damage. The endoscope cover fixing device includes a fixing device main body and a pair of fixing protrusion portions. The fixing device main body includes a curved portion and insert holes, and is deformable in the direction in which the bend amount increases. The pair of fixing protrusion portions, which have contact surfaces, are provided to protrude from a concave surface side of the fixing device main body and are disposed in two opposing regions of the concave surface. The contact surfaces are disposed in parallel with a fixed distance therebetween. During deformation of the fixing device main body, the pair of fixing protrusion portions move in parallel in opposing directions. As a result, the contact surfaces contact opposing positions on the outer circumferential surface of the endoscope by way of the cover.

Abstract: A stylet is provided which makes it possible to improve the handling of a catheter while also facilitating insertion of the catheter. A catheter set having such a stylet is also provided. A stylet with a hole and a stylet without a hole include, respectively: a stylet main body; an engaging part; a film-like linking part for linking the stylet main body and the engaging part; and a soft tip end part which is provided at a tip end of the engaging part. The engaging part has a tapered tubular shape which can expand and contract thanks to an alternating arrangement of soft parts and rigid parts in the peripheral direction. The stylet main body is then pulled rearwards from a state in which the stylet with a hole and the stylet without a hole are assembled with a catheter, thereby enabling the engaging part, which can engage with the edge of the opening of the catheter, to contract in the radial direction and be withdrawn.

Abstract: A fluid flow detector includes a detector main body defining a fluid flow channel having a fluid flow detection channel positioned adjacent an upstream hole and a discharge channel positioned adjacent a downstream hole. A mobile body is positioned within the fluid flow channel and dimensioned to be movable along the fluid flow channel. The diameter of the fluid flow detection channel is smaller than the diameter of the discharge channel, and the maximum diameter of the outer peripheral edge part of the face of the fluid flow channel orthogonal to the direction of movement of the mobile body is slightly smaller than the diameter of the fluid flow detection channel. The upstream hole and the downstream hole are formed with a size and shape such that fluid can flow through the upstream and downstream holes without being obstructed by the mobile body.

Abstract: To provide a gastrostomy tube extension device which can facilitate the insertion or removal operation in and from the patient, as well as to increase the simplicity of manufacture without sacrificing safety of operation. [Solving Means] A gastrostomy tube extension device 20 used for inserting or taking out the gastrostomy tube 10 into/from the hole on the patient includes a rod 21, a fixing member 22, and an engaging member 23. The rod 21 is formed of a rod-shaped member, and is formed with engaging stepped portions 24a on the proximal portion thereof. The fixing member 22 is adapted to be capable of moving along the longitudinal direction of the rod 21, and an engaging projection 35 which can be fixed to the tube member 11 is formed on the peripheral surface of the fixing member 22. The engaging member 23 includes a lower engaging portion 26 engageable with the engaging projection 35 and an upper engaging portion 27 which is engageable with the engaging stepped portion 24a.