US 2020/0367922 A1 · DIFFERENTIAL PRESSURE MOTOR AND METHOD FOR OPERATING A DIFFERENTIAL PRESSURE MOTOR

Abstract

A differential pressure motor comprising two working pistons and a rod that move in a hollow space. Walls defining the hollow space have five openings. A valve piston moves between and against the working pistons and can be driven by the working pistons. The valve piston with the five openings forms a valve with which an alternate impact of a first pressure and a second pressure on the working pistons is controllable when the pressures are applied to three of the five openings such that the working pistons periodically move which drives a periodic movement of the valve piston. Also disclosed are a surgical drive system with, a medical lavage system for the debridement of soft tissue and/or bone tissue having, and a medical device for brushing, rasping or sawing soft tissue and/or bone tissue with such a differential pressure motor, and a method for operating a differential pressure motor.

Claims34

Dependent claims

A differential pressure motor comprising:

two working pistons each with a working surface;
a rod that connects the working pistons to each other and keeps them spaced apart from each other;
walls defining a hollow space that is at least partially cylindrical and in which the working pistons and the rod are movably disposed and having five complete openings;
a valve piston movably disposed between and against the working pistons, configured to be driven through thrusts of the working pistons against the valve piston, and movable in the hollow space,
wherein the valve piston with the five complete openings forms a valve with which an alternate impact of a first pressure and a second pressure on the working surfaces of the working pistons is controllable when the first pressure and the second pressure are applied to three of the five complete openings such that a periodic movement of the working pistons and the rod is created in the hollow space, which drives a periodic movement of the valve piston.

2 more elements

A method for operating a differential pressure motor, in which a first working piston and a second working piston are connected via a rod and oscillate linearly in a hollow space, wherein the method comprises the following steps:

A) providing a valve piston, which is disposed in the hollow space between the first working piston and the second working piston in a first position;
B) providing a connection between a vacuum port and a first working space and a connection between a second working space and the surrounding area of the differential pressure motor in the first position of the valve piston, wherein the first working space is bounded by the first working piston and the second working space is bounded by the second working piston;
C) evacuating gas from the first working space and as a result moving the first working piston and the second working piston in the hollow space;
D) impacting the valve piston with the second working piston, so that the valve piston is transferred into a second position;
E) providing a connection between the vacuum port and the second working space and a connection between the first working space and the surrounding area of the differential pressure motor in the second position of the valve piston;
F) evacuating gas from the second working space and flowing in of ambient air into the first working space and as a result, reverse moving of the first working piston and the second working piston in the hollow space;
and
G) impacting the valve piston with the first working piston, so that the valve piston is transferred into the first position.

5 more elements

A) providing a valve piston, which is disposed in the hollow space between the first working piston and the second working piston is in a first position;
B) providing a connection between a compressed gas port and a first working space and a connection between a second working space and the surrounding area of the differential pressure motor in the first position of the valve piston, wherein the first working space is bounded by the first working piston and the second working space is bounded by the second working piston;
C) increasing the gas pressure in the first working space and as a result, moving the first working piston and the second working piston in the hollow space;
D) impacting the valve piston with the first working piston, so that the valve piston is transferred into a second position;
E) providing a connection between the compressed air port and the second working space and a connection between the first working space and the surrounding area of the differential pressure motor in the second position of the valve piston;
F) increasing the gas pressure in the second working space and flowing out of compressed gas from the first working space and as a result, reverse moving of the first working piston and the second working piston n the hollow space;
and
G) impacting the valve piston with the second working piston, so that the valve piston is transferred into the first position.

5 more elements

Dependencies are inferred from the claim text.

Differential pressure motor and method for operating a differential pressure motor

Life of this patent

Differential pressure motor and method for operating a differential pressure motor

Life of this patent

Abstract

Claims34