Piston

About: Piston is a research topic. Over the lifetime, 176135 publications have been published within this topic receiving 825412 citations. The topic is also known as: automotive piston.

Force-developing device for cutting forceps

Abstract: A force-developing device for forceps of the type equipped with two jaw elements (2, 3) and with two handles (4, 5) includes a jaw (6A). A link rods system (6B) is articulated with the jaw (6A). A front end of a piston (7) is connected to the link rods system (6B). The piston is housed slidingly inside a first handle (4). A yoke (8) is provided for holding the second handle (5) relative to the first handle (4). A pair of complementary racks (9) mechanically drive the piston (7), the pair being borne by each of the two handles (4, 5). A trigger catch and a rack for preventing the return of the piston are borne by the first handle (4). The pair of complementary racks (9) for driving the piston (7), the trigger catch, and the rack acts alternately on the piston so that by successively moving the second handle (5) towards and away from the first handle (4), the piston (7) is moved forwards and the jaw (6A) is deformed by means of the link rods system (6B). The successive movement brings the two jaw elements (2, 3) towards each other.

Method and apparatus for detecting occlusions in an ambulatory infusion pump

Abstract: An improved pump, reservoir and reservoir piston are provided for controlled delivery of fluids. A motor is operably coupled to a drive member, such as a drive screw, which is adapted to advance a plunger slide in response to operation of the motor. The plunger slide is removably coupled to the piston. A method, system, and an article of manufacture for automatically detecting an occlusion in a medication infusion pump is provided. The electrical current to an infusion pump is measured. Based on measurements of one or more variables, the infusion pump detects whether there is an occlusion in the system. The methods of detecting occlusions may be dynamic.

Application of an improved damper to an intervertebral stabilization device

Abstract: An improved damper, of the type comprising elements for progressively resisting, in exponential manner, the advance of a piston under the effect of a force of axial compression, which functions as a stop opposing any displacement of the piston beyond a predetermined value, in an intervertebral stabilization device.

Method of creating a mechanical force switch for a medical device

Abstract: A method of creating a mechanical force switch to be disposed along a longitudinal axis of a medical device, comprising providing a hollow body (30) defining a body interior cavity (32, 34), moveably disposing a switching piston (10) along the longitudinal device axis in the body interior cavity to define a switch-making piston position or a switch-breaking piston position, coupling an electrically-conductive contact (80, 160) to the switching piston such that it is moveable between the two piston positions to define a switch-making state, and imparting a variable longitudinal bias to the switching piston at a bias-device contact with a bias device (50) to retain the switching piston in the switch-making piston position and the switch-breaking piston position, respectively, until an external force imparted to the switching piston exceeds the longitudinal bias.

Fluid actuated orthopedic tool

Abstract: A fluid actuated orthopedic tool for cutting away degenerated or torn cartilage which includes a housing having a piston chamber in which a piston is reciprocally mounted and an associated head portion. The head portion includes an elongated tubular guide having a fixed cutter member connected thereto, and through which there extends a rotatable shaft having a movable cutter member connected thereto. The rotary shaft is driving connected by a pinion to a piston rack so that the displacement of the piston by fluid pressure and spring return effects the actuation of the movable cutter member to effect a cutting action. A lock is provided to lock the cutter members, and an internal adjustment is provided to adjust the stroke of the piston. Also, a valve means and associated actuator is provided to control the flow of actuating fluid to the piston chamber.