Check valve for a trocar system
A flap valve for a trocar system including a valve housing ( 12 ) that is proximally attachable to a guide tube ( 10 ), a lead-through opening ( 30 ) formed in the valve housing ( 12 ), and a pivotally mounted flap valve ( 46 ). The flap valve ( 46 ) is manually pivotable from a “closed” position to an “open” position via a slide rod. The slide rod ( 52 ) is mebedded in the body ( 12 ), is radially slidable and contacts with its inner end an actuation area of the flap valve ( 46 ).
1. A flap valve for a trocar system, with:
a valve housing, which is proximally attachable to a guide tube,
an opening axially flush with the guide tube,
a flap body including a flap that is pivotal about an axis perpendicular to and eccentric to an axis of the opening, and
a slide rod, guided in the valve housing to be manually slidable and via which the flap can be pivoted out of a closed position in which the flap blocks said opening and into an open position in which said opening is unblocked,
wherein the slide rod is slidable along a line which is substantially perpendicular to the axis of the opening and does not intersect a pivot axis of the flap, that the flap, relative to it's pivot axis, is a two-armed lever, of which one arm includes a valve part and one arm bears an actuation area, against which an inward end of the slide rod contacts, and that the actuation area is formed in a way, that in any pivot angle of the flap, a center axis of the slide rod forms, with a surface of the actuation area with which the slide rod is in contact, describes an angle of at least 15°.
2. A flap valve according to claim 1 , wherein an angle of the center axis of the slide rod to the actuation area, in every pivoted angle of the flap is at least 30°, preferably at least 45°.
3. A flap valve according to claim 1 , wherein the pivot axis of the flap is on its distal side and the actuation area is on the flap proximal from the pivot axis.
4. A flap valve according to claim 3 , wherein the flap is disk shaped, that the pivot axis extends through a mounting block that is located on its radial outer edge on a distal side of the flap, and that the actuation area runs from a proximal outer edge of the flap to this mounting block.
5. A flap valve according to claim 4 , wherein the center axis of the slide rod is positioned parallel and near a proximal area of the flap when the flap is resting in its “closed” position.
6. A flap valve according to claim 5 , wherein the actuation area, at an area adjacent a proximal outer edge of the flap, against which the slide rod contacts when in a closed position of the flap, runs generally orthogonal to the proximal area of the flap, that a radial distance of the actuation area from the pivoting axis of the flap reduces going from the proximal outer edge of the flap towards the mounting block, and that the actuation area in its distal end area, against which the slide rod contacts when in an open position of the flap, has an angle of less than 45° to a plane of the flap.
7. A flap valve according to claim 1 , wherein the slide rod is inserted into a bushing that is radially led into the valve housing and operates radially via a pushbutton against a force of a spring to open the flap.
8. A flap valve to claim 1 , wherein recesses contoured to conform to fingers are provided distal to the valve housing, on both sides of the guide tube.