Abstract: One embodiment of a stent includes a cylindrical openwork frame having holes defined by side frame segments and middle frame segments, and notches defined by the side frame segments. This stent is made of a super elastic metal as a single piece without an abrupt change in the physical property of the stent. Another embodiment of the stent is made of wires in the shape of a substantially circular cylinder. The wires forming the stent are made thicker in the middle portion and thinner in both end portions. A stenosis-treating device includes an indwelling stent, a tubular sheath which holds the stent in a compressed state, a balloon catheter which is passed through the sheath and which has a dilatation balloon, and a projection at the rear of the portion of the sheath in which the stent is held which comes into contact with the rear end of the stent when the sheath is moved rearward and lets the stent out of the front end of the sheath.

Abstract: A stent in the form of a generally tubular member has a diameter allowing for insertion into a body passageway and is radially expandable upon application of an outward force. A series of annular units are axially arranged to construct the stent. Each annular unit includes a plurality of generally ellipsoidal or polygonal elements equiangularly arranged around the stent axis, the elements being axially elongate and having a center opening. A tie member connects opposed ends of adjacent elements. Adjacent annular units are interconnected at their tie members by a connecting member.

Abstract: A tubular body for reducing the rate at which a fluid flows to a predetermined rate with a resistance in a flow control device of a pressure measuring system, includes a tubular member having an axis along which the fluid can flow therethrough, and a land projecting radially inwardly from an inner wall surface of the tubular member. The tubular member and the land are integrally formed as a unitary structure, the land having an orifice extending along the axis of the tubular member. A method of manufacturing the tubular body, and a flow control device incorporating the tubular body are also disclosed.

Abstract: A disposable pressure transducer for measuring fluid pressure, which includes a sensor assembly in a housing. The housing includes a fluid chamber and a sensor-accommodating chamber which are formed integrally with each other.

Abstract: A disposable pressure transducer for measuring fluid pressure, which includes a sensor assembly in a housing. The housing includes a fluid chamber and a sensor-accommodating chamber which are formed integrally with each other.

Abstract: A tubular body for reducing the rate at which a fluid flows to a predetermined rate with a resistance in a flow control device of a pressure measuring system, includes a tubular member having an axis along which the fluid can flow therethrough, and a land projecting radially inwardly from an inner wall surface of the tubular member. The tubular member and the land are integrally formed as a unitary structure, the land having an orifice extending along the axis of the tubular member. A method of manufacturing the tubular body, and a flow control device incorporating the tubular body are also disclosed.

Abstract: A catheter assembly of the hypodermic embedment type for infusing a fluid medicament such as a carcinostatic agent into a body cavity such as a blood vessel for therapeutic purposes, includes a medicament infusion implement having an inlet port and an outlet port and a catheter connected to the implement outlet port. The device is used by inserting and indwelling the catheter in a body cavity and embedding the implement beneath the skin. Treatment can be repeated any number of desired times with the catheter assembly kept indwelled in the body, resulting in a significant reduction of the burden to the patient as compared with the prior art technique requiring insertion and withdrawal of a catheter every time when treatment is made. Also, the danger of infection during the treatment is eliminated, as compared to the prior art technique where the catheter is percutaneously inserted.

Abstract: The waveform of a blood pressure of a patient is corrected by a pressure correcting mechanism having an air chamber having a volume ranging from 1 to 150 .mu.l and a resistance passage having one end communicating with the air chamber and the other end with a blood pressure measuring line. The resistance passage has a cross-sectional area ranging from 2000 to 160,000 .mu.m.sup.2 and a length ranging from 0.5 to 40 mm. A fluid such as a physiological saline solution filled in the blood pressure measuring line can flow through the resistance passage into the air chamber to dampen an extraneous pressure wave transmitted through the blood pressure measuring line.

Abstract: An extruder apparatus for molding a tube used for guiding a rod-like medical instrument into a living body. The resulting tubular body is made of a synthetic resin and has a longitudinal hollow portion to permit the passage of the rod-like medical instrument. The whole of the tubular body is formed to have a chemical uniformity, but at least one brittle portion such as a weld line is longitudinally formed over the entire length (or almost the entire length except the tip portion) of the tubular body. The brittle portion is formed by a die including a nozzle having a resin flow passageway of annular cross section. At least one baffle extends radially into the passageway for substantially temporarily splitting the flow which is then recombined to form the brittle portion.

Abstract: A method of firmly securing a catheter body to a surface portion of human skin, without causing the catheter body to be bent or reducing the diameter of the inner passage of the catheter body. This method employs a catheter-securing member which comprises a cylindrical body for allowing the catheter body to be slidably inserted therein, and a slit is provided along the axial direction of the cylindrical body. In this method a ligature is first pierced through a surface portion of human skin and tied over the surface of human skin, leaving a pair of free end portions extending out of the skin, and then the cylindrical body is secured with the free end portions of the ligature by winding the ligature around the cylindrical body and fastening them.

Abstract: Medical instrument introduction cannula, which is useful as a guide means for introducing and indwelling a rod-like material instrument such as a catheter and a guide wire. This cannula is removed after use from the medical instrument by being splitted. This cannula is formed of a hollow tubular body having a strip member consisting of a material different from the other portion of the tubular body, which extends over the entire or almost the entire length of the tubular body. The strip member has a weld line along the length of the strip member, or consists of a resin which exhibits a good bonding property only to one of the other components forming the tubular body. The tubular body can be splitted by way of the weld line or the removal of the strip member having such a bonding property. The method of manufacturing the medical instrument introduction cannular by a two-color extruder is also disclosed.

Abstract: Medical instrument introduction cannula, which is useful as a guide means for introducing and indwelling a rod-like medical instrument such as a catheter and a guide wire. This cannula is removed after use from the medical instrument by being splitted. This cannula is formed of a hollow tubular body having a strip member consisting of a material different from the other portion of the tubular body, which extends over the entire or almost the entire length of the tubular body. The strip member has a weld line along the length of the strip member, or consists of a resin which exhibits a good bonding property only to one of the other components forming the tubular body. The tubular body can be splitted by way of the weld line or the removal of the strip member having such a bonding property. The method of manufacturing the medical instrument introduction cannular by a two-color extruder is also disclosed.

Abstract: A method for molding a tube for guiding a rod-like medical instrument into a living body, which includes a tubular body made of a synthetic resin and having a longitudinal hollow portion to permit the passage of the rod-like medical instrument. The whole of the tubular body is formed to have a chemical uniformity, but at least one brittle portion such as a weld line is longitudinally formed over the entire length (or almost the entire length except tip portion) of the tubular body.

Abstract: A fluid pressure transducer apparatus comprising a fluid pressure transducer mechanisms and a fluid pressure-transmitting path. The fluid pressure transducer mechanism includes a fluid pressure detection mechanism, having a detection surface of a fluid pressure, for converting a fluid pressure into an electrical signal, and a chamber, formed on the detection surface, for storing a fluid. The path includes a cylindrical member having a first port comminicating with the chamber and a plurality of second ports arranged on a surface perpendicular to an axis of the cylindrical member, and a stop cock arranged in the cylindrical member to be slidable with an inner surface of the cylindircal member. The stop cock has a path defined therein and a handle for slidably rotating the stop cock in the cylindrical member through a predetermined angle so that the path communicates the first port with only one of the plurality of second ports and no other second ports communicate with each other.

Abstract: There is disclosed a guiding tube for introducing rod-like medical instruments such as a catheter, which can be easily split and removed from, for example, a catheter, after the catheter inserted through the guiding tube has been attached to a blood vessel. The guiding tube comprises a main body provided with a longitudinal slit and formed of a mixture of first and second materials and a stripe detachably embedded liquid-tight in the slit of the main body and formed of a third material which exhibits a good bonding to the second material, but a poor bonding to the first material.

Abstract: A nutritive catheter is assembled by attaching a head to the distal end of a main tubing having a duct therethrough, the head being formed from a composition comprising a flexible synthetic resin and a finely divided metal material in a ratio by volume of resin to metal material of at least 2 and having a specific gravity of at least 2. An opening is provided in the head in communication with the tubing duct.

Abstract: A medical instrument-guiding tube for guiding a catheter or other rod-like medical instrument into a blood vessel. This guiding tube comprises a hollow tube body and at least one linear body integrally joined to the tube body along the longitudinal direction of the tube body. The plastic resin forming the tube body has a poor compatibility with that of linear body. The tube body and the linear body are engaged together through a complementary concave-convex engagement which can be disengaged with a reasonable force.

Abstract: A fluid pressure transducer apparatus comprising a fluid pressure transducer mechanism and a fluid pressure-transmitting path. The fluid pressure transducer mechanism includes a fluid pressure detection mechanism, having a detection surface of a fluid pressure, for converting a fluid pressure into an electrical signal, and a chamber, formed on the detection surface, for storing a fluid. The path includes a cylindrical member having a first port communicating with the chamber and a plurality of second ports arranged on a surface perpendicular to an axis of the cylindrical member, and a stop cock arranged in the cylindrical member to be slidable with an inner surface of the cylindrical member. The stop cock has a path defined therein and a handle for slidably rotating the stop cock in the cylindrical member through a predetermined angle so that the path communicates the first port with only one of the plurality of second ports and no other second ports communicate with each other.

Abstract: A flowmeter has a main body having fluid inlet and outlet passages and a vertical fluid channel formed in the main body and having one end communicating with the inlet passage and the other end communicating with the outlet passage. The vertical fluid channel has a first passage and a second passage having a cross-sectional area larger than that of the first passage. The first passage has therein a float for regulating a flow rate of the fluid flowing therethrough, and is tapered to have a cross-sectional area increasing from the inlet passage side toward the outlet passage side such that the float remains in position when the fluid passes through the first passage. The second passage has therein a valve for opening the second passage when the fluid is to flow therethrough and for closing the second passage when the fluid is not to flow therethrough. The valve has a projection for moving the float toward the inlet passage when the second passage is closed.

Abstract: An apparatus for detoxifying body fluid has a columnar hollow container with an inlet and an outlet for body fluid. This container is filled with non-coated petroleum pitch activated carbon particles which have been washed by ultrasonic waves to a degree that the number of carbon dust fine particles released in a physiologically acceptable solution is less than 100 particles/ml for particles of more than 2.mu. diameter and less than 10 particles/ml for particles of more than 5.mu. diameter.