Abstract: The present invention provides a closable male luer connector (101) in which an inner portion (121) within the spigot (111) of the connector is movable from a sealing position to an open position on connection of the connector to a female luer connector (10). The movement of the inner portion may be caused by, for example, action of the female connector on a projecting arm (122b) or a screw thread arrangement.

Abstract: A medical stopcock which allows easier switching operation of plural branch-tubes. The main body of the stopcock comprises a chamber part with a nearly spherical inner surface, and an upstream branch-tube, a downstream branch-tube and a merge-branch-tube all extending from the chamber part. A valve body of the stopcock comprises a nearly spherical valve main body and a rod-shaped operating part with a guide hole linking the inner surface of the chamber part to the outside. In operation, the rod-shaped operating part is moved along the guide hole through the use of the horizontal flow passages and the vertical flow passage to allow the predetermined branch-tubes out of the upstream branch-tube, the downstream branch-tube and the merge-branch-tube to communicate with one another or to shut-off the communication.

Abstract: A male luer connector to prevent generation of bacteria and waste of medicinal liquid. The male luer connector comprises a basal end and a tip end rotatable relative to the basal end; the male luer part is tapered and rotatable within the tip end. The outer peripheral surface of the tip end is decreased from the rear side to the front side; and a stick-like male luer occluding portion is provided within the male luer part which can tightly occlude liquid from the tip end opening of the male luer part. An internal thread portion is provided on the inner peripheral surface of the basal end and an external thread, helically engaged with the internal thread, is provided to the rear end portion of the male lure, whereby the tip end opening can be opened or closed by rotating the tip end relative to the basal end.

Abstract: A signal processing method and apparatus reducing distortion using divided signals differing in only amplitude by weighting an input signal by first weights ki (i=1 to 4) to obtain divided signals, performing the same signal processing f(x) on the divided signals, weighting the signal processed divided signals by second weights l1 (i=1 to 4), and adding the divided signals Vout1 to Vout4 weighted by the second weights. The first weights are k1=t, k2=?t, k3=1, k4=?1, while the second weights are l1=?1, l2=1, l3=t3, l4=?t3. Here, t=b/a (where a and b are different positive integers).

Abstract: The present invention provides a liquid coinfusion unit that can prevent backflow. The coinfusion unit incorporates a closure mechanism (21a, 21b) for closing a fluid connection to an inlet port (14) while maintaining a fluid connection between a mixing port and an outlet port (13), thereby preventing the backflow of a medicinal liquid through the inlet port. Operation of a manipulating element (22a, 22b) by a user causes the closure mechanism to obstruct a fluid flow channel from the inlet port (14) and on release of the manipulating element, the closure mechanism returns to a fluid flow configuration.

Abstract: A connector for switching communication-to-interception states between liquid transfusion tubes. The connector comprises a connector body, a seal member, and a valve with an improved sealing which limits contact with air and minimizes generation of bacteria during medical use.

Abstract: The invention is directed to a fluid mixture delivery instrument which excludes entry of air during fluid delivery. The instrument has a main chamber part and a plurality of branch pipes which extend in different directions from the chamber part. The branch pipes are configured with slitted rubber stoppers with closures to which connection tubes can be inserted for the delivery of fluid with exclusion of air.

Abstract: A luer-locking fitting connection mechanism is structured with a female connector and male connector. It thus becomes possible to connect male connector to female connector by screwing the female threads formed on the internal circumferential surface of luer-locking fitting member attached to male connector to the male threads formed on the external circumferential surface of female connector. Provision is also made for an engagement projection to be provided on the base of male threads on the external circumferential surface of female connector, and for passive engagement member, that can engage with engagement projection, to be provided on the tip of female threads on the internal circumferential surface of luer-locking fitting member. Thus, when male threads and female threads are screwed together in a suitable condition, the engagement projection and passive engagement member engage with each other.

Abstract: A connector has a connection port closed by a sealing member. The connection port is attached to a first body portion which in turn is connected to a second body portion by an elastic bellows.

Abstract: A medical tube has a main body portion and a steerable distal portion made from the same material as the distal portion. A plurality of lumens extend through the main body portion including guide wire lumens through which guide wires (extend from the steerable distal portion to a control device at a proximal end of the main body portion.

Abstract: A stylet device includes a deformable stylet having an elongated shape and being provided with at least one actuator wire lumen extending in an axial direction in a position that is radially off-center with respect to a cross section of the stylet. At least one actuator wire is inserted into the actuator wire lumen. One end of the actuator wire is affixed to the stylet. A tension-conferring means is connected to another end of the actuator wire for imparting tension to the actuator wire. A medical tube assembly includes the stylet device and a medical tube having an interior into which the stylet of the stylet device is inserted.

Abstract: The present invention is directed to a connector with which negative pressure in the channel space in the connector can be prevented during luer removal, in a closed-system connector. A slit (49) is furnished in valve body (40) of three-way stopcock (100). During luer access and luer removal, first and second moving parts (M1and (M2) to the left and right of slit (49) enter and withdraw from first and second valve body accommodating chambers (51) and (52), respectively. First and second valve body accommodating chambers (51) and (52) are formed outside of channel space (S), so the operation whereby first and second moving parts (M1) and (M2) enter and withdraw during luer access and luer removal does not affect the change in volume of channel space (S) and negative pressure can be prevented from occurring in channel space (S) by the aforementioned entry and withdrawal.

Abstract: A medical tube set includes a tube and a stylet that improves the insertability of tube. The stylet structure comprises an inner core that can be inserted into the tube, an apical tip that is affixed to the apical end of inner core, and a movable expansion member that can move between apical tip of inner core and stop that is provided at a predetermined distance from apical tip. An engagement is formed at the posterior end of apical tip, and is able to engage the apical end of tube. By positioning movable expansion member within apical end of tube, apical end can expand radially outwards so that apical tip can pass through.

Abstract: A membrane switch is actuated by pressure transmitted from a movable key member through two coaxial springs connected end-to-end. A first of the two springs is held by the key member in a partially strained state requiring an initial force to strain it further. The second spring, smaller in diameter and stiffer than the first, has a free end at which force is applied to the membrane switch. As a top of the key member is pressed, the free end of the second spring moves toward, touches, then presses the membrane switch. Force builds rapidly with displacement in the small spring until it reaches the initial force under which the first spring is retained. This initial force is made roughly equal to the force required to actuate the membrane switch. After that point, the force-displacement characteristic is that of the two-spring combination, which is less stiff than the second spring alone. Thus, long key travel is permitted while the actuation force is reached early in the displacement of the key member.

Abstract: A double-axis key switch has a key cap with a pair of key stems which slide into a housing to actuate a pair of switches. The key stems are slightly out of parallel so that the axes of the key stems meet in a direction of stroke relative to the key cap. However, the sleeves, into which the key stems insert, are parallel. When the key cap is pressed off-center, causing tilting of the key cap, one key stem advances ahead of the other. Because of the relative positions of the axes, binding forces increase in the leading key stem and decrease in the following stem. The asymmetry of the binding forces tends to correct the tilting of the key cap so that the key cap advances symmetrically and smoothly.

Abstract: In a keyboard switch that switches on and off by sliding a key stem, the key stem is slidably inserted in a key stem sleeve that is integral with the housing of the keyboard switch. The key stem comprises a sliding member integrally formed therewith and a keytop support whose shape is a wide flange formed integrally with and projecting outwardly from the outer periphery of the sliding member. An elastic hollow cylinder has one end hermetically joining the lower face of the keytop support and its other end hermetically joining the outer periphery of the key stem guide sleeve. With this structure, there can be no gap between the sliding member and the keytop support, so the interior of the keyboard switch is kept completely free from dust and moisture.