Pistol for the pressing out of bone cement with an attachable cement syringe
First Claim
1. Pistol for the pressing out of bone cement, comprising an attachable cement syringe which has a cylinder with an ejection piston and a narrower neck which adjoins at the cylinder, with a displacer bar being insertable into the pistol, which displacer bar can after the ejection of the cylinder content be introduced into the neck through an aperture of the ejection piston by means of a first tubular bar which acts on the ejection piston and which has a second advance mechanism which is journalled in the tubular bar, wherein the tubular bar is designed as a piston rod of a first piston which is individually displaceable by a fluid in the pistol;
- and wherein the second advance mechanism is individually displaceable by a second piston, which is charged by the fluid and which ejects the displacer bar;
with the two pistons being excitable with the fluid, which is under pressure, via a control device in the pistol;
whereby the displacements of the two pistons relative to their cylinders are added for one large stroke.
2 Assignments
0 Petitions
Accused Products
Abstract
A pistol for the pressing out of bone cement (1) comprises an attachable cement syringe (2) which has a cylinder (3) with an ejection piston (4) and a narrower neck (5) which adjoins at the cylinder (3), with a displacer bar (6) being insertable into the pistol in order to additionally eject residual cement with a second advance mechanism (8). A first piston (9) acts via a piston rod (7) on the ejection piston (4). A second piston (11), which is displaceably journalled in the piston rod (7) and can be activated independently of the first piston, acts on the displacer bar (6). A fluid (10) which is under pressure is controlled via a control device (12) in such a manner that the displacer bar (6) moves relative to the first piston (9) only when the latter has reached a predetermined end position.
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Citations
17 Claims
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1. Pistol for the pressing out of bone cement, comprising an attachable cement syringe which has a cylinder with an ejection piston and a narrower neck which adjoins at the cylinder, with a displacer bar being insertable into the pistol, which displacer bar can after the ejection of the cylinder content be introduced into the neck through an aperture of the ejection piston by means of a first tubular bar which acts on the ejection piston and which has a second advance mechanism which is journalled in the tubular bar, wherein the tubular bar is designed as a piston rod of a first piston which is individually displaceable by a fluid in the pistol;
- and wherein the second advance mechanism is individually displaceable by a second piston, which is charged by the fluid and which ejects the displacer bar;
with the two pistons being excitable with the fluid, which is under pressure, via a control device in the pistol;
whereby the displacements of the two pistons relative to their cylinders are added for one large stroke. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- and wherein the second advance mechanism is individually displaceable by a second piston, which is charged by the fluid and which ejects the displacer bar;
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16. Pistol for dispensing bone cement from a syringe which is attachable to the pistol and has a cylindrical portion terminating in a reduced cross-section neck through which fluid can be ejected and an ejection piston that is movable in the cylinder, the pistol comprising a first piston coupled to a tubular bar having a free end engageable with the ejection piston;
- a source of pressurized fluid and a control device fluidly coupled thereto for charging-the first piston with a pressurized fluid;
a displacer bar axially movable disposed in the tubular bar and having an end extendable through the ejection cylinder for extending the displacer bar into the neck of the syringe; and
a second piston operatively coupled with the displacer bar for axially moving the displacer bar relative to the tubular bar and thereby extending the displacer bar beyond the end of the tubular bar into the neck of the syringe;
the control device being fluidly connected with and operative for charging the second piston with pressurized fluid independently of the first piston so that the first and second-pistons can be activated independently of each other.
- a source of pressurized fluid and a control device fluidly coupled thereto for charging-the first piston with a pressurized fluid;
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17. Pistol for use with a syringe having a cylinder terminating in a reduced cross-section neck through which fluid can be ejected and an ejection piston including a central, axially oriented, closable through aperture and being movably disposed in the cylinder of the syringe, the pistol comprising a housing and a telescopic actuator for reciprocating the ejection piston in the syringe and forcing fluid through the neck out of the syringe, the telescopic actuator comprising a first piston coupled to a tubular piston rod and reciprocably arranged in the pistol housing, a forward end of the tubular piston rod being engageable with the ejection piston for moving the ejection piston towards the neck of the syringe, a second piston coupled to a second piston rod axially movably arranged within the tubular piston rod, the second piston rod being extendable through the aperture in the ejection piston for movement toward and into the neck of the syringe;
- and fluid flow control means operatively coupled with the first and second pistons for independently charging the first and second pistons with a pressurized fluid and therewith independently activating the pistons so that, upon activation of the second piston by the control means, the second piston moves the second piston rod relative to the tubular piston rod.
Specification