(EP3695797) Bone cement applicator with clampable discharge plunger 机翻标题: 暂无翻译,请尝试点击翻译按钮。

源语言标题
(EP3695797) Bone cement applicator with clampable discharge plunger
公开号/公开日
EP3695797 / 2020-08-19
申请号/申请日
EP20157564 / 2020-02-17
发明人
VOGT SEBASTIAN DRKLUGE THOMAS DR;
申请人
HERAEUS MEDICAL;
主分类号
IPC分类号
A61B-017/88 B01F-013/00
摘要
(EP3695797) Bone cement applicator having a cartridge (1) with an interior space (2), a cartridge head (4) with a discharge opening (5), a mixing member (6) which is movable in the interior space (2) with a mixing rod (7), a discharge piston (3), which is arranged in the cartridge (1) and which is mounted in the interior (2) such that it can be pressed in the direction of the discharge opening (5), wherein the discharge piston (3) bears with an outer cylindrical lateral surface (44) against an inner wall of the cartridge (1), and at least one clamping element (8) which is arranged on the inner wall of the cartridge (1) in the region of the rear side of the inner space (2), wherein the at least one clamping element (8) projects from the inner wall of the cartridge (1), wherein the cylindrical lateral surface (44) of the dispensing piston (3) can be elastically deformed by the at least one clamping element (8) in the direction of a central cylinder axis, so that the dispensing piston (3) can be clamped with the at least one clamping element (8) on the rear side of the cartridge (1).
机翻摘要
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地址
代理人
(EP3695797) Schultheiss & Sterzel Patentanwälte PartG mbB ([DE]) Reg. Nb: 101322759
代理机构
;
优先权号
2019DE-10104020
主权利要求
(EP3695797) 1. Bone cement applicator for providing a bone cement, in particular a polymethyl methacrylate bone cement, the bone cement applicator having a cartridge (1, 51, 101, 151) with a cylindrical interior (2, 52, 102, 152), a cartridge head (4) with a discharge opening (5) for expelling the bone cement, wherein the cartridge head (4) closes the cylindrical interior space (2, 52, 102, 152) of the cartridge (1, 51, 101, 151) on a front side of the cartridge (1, 51, 101, 151) except for the discharge opening (5), a mixing member (6) which is arranged in the cylindrical interior space (2, 52, 102, 152) of the cartridge (1, 51, 101, 151) and is movable in the interior (2, 52, 102, 152) with a mixing rod (7, 57, 157) guided into the interior (2, 52, 102, 152), a discharge piston (3, 53, 103, 153) which is arranged in the cartridge (1, 51, 101, 51, 101, 151) and which is mounted in the cylindrical interior (2, 52, 102, 152) of the cartridge (1, 51, 101, 151) such that it can be pressed in the direction of the discharge opening (5), wherein the discharge piston (3, 53, 103, 153) has an outer cylindrical lateral surface (44, 94, 144, 194) and wherein the discharge piston (3, 53, 103, 153) bears with its outer cylindrical lateral surface (44, 94, 144, 194) at least in regions against an inner wall of the cartridge (1, 51, 101, 151) delimiting the cylindrical inner space (2, 52, 102, 152), and at least one clamping element (8, 58, 108, 158), which is arranged in the region of a rear side of the cylindrical interior (2, 52, 102, 152) opposite the front side of the cartridge (1, 51, 101, 151) on the inner wall of the cartridge (1, 51, 101, 151) delimiting the cylindrical interior (2, 52, 102, 152), wherein the at least one clamping element (8, 58, 108, 158) projects from the inner wall of the cartridge (1, 51, 101, 151) in the direction of the cylindrical inner space (2, 52, 102, 152), wherein the cylindrical lateral surface (44, 94, 144, 194) of the discharge piston (3, 53, 103, 153) is at least partially surrounded by the at least one clamping element (8, 58, 58, 108, 158) can be elastically deformed in the direction of a central cylinder axis of the cylindrical interior (2, 52, 102, 152), so that the discharge piston (3, 53, 103, 153) can be clamped with the at least one clamping element (8, 58, 108, 158) on the rear side of the cartridge (1, 51, 101, 151). 2. The bone cement applicator of claim 1, characterized in that the at least one clamping element (8, 58, 108, 158) is formed integrally with the cartridge (1, 51, 101, 151). 3. Bone cement applicator according to claim 1 or 2, characterized in that the discharge opening (5) in the cartridge head (4) is or can be closed with a releasable closure, wherein preferably a thread (26) is arranged on the cartridge head (4), into or onto which the closure is or can be screwed with a mating thread matching the thread (26) in order to close the discharge opening (5). 4. The bone cement applicator according to any one of the preceding claims, characterized in that an outer diameter of the discharge piston (3, 53, 103, 153) is equal to or smaller than the inner diameter of the cylindrical interior (2, 52, 102, 152) of the cartridge (1, 51, 101, 151), wherein preferably at least one circumferential seal (12, 62, 112, 162) and/or a circumferential wiping lip (42, 92, 142, 192) is arranged on the outer circumference of the discharge piston (3, 53, 103, 153). 5. The bone cement applicator according to any one of the preceding claims, characterized in that the internal diameter of the cylindrical interior (2, 52, 102, 152) of the cartridge (1, 51, 101, 151) is reduced by the at least one clamping element (8, 58, 108, 158) in the region of the at least one clamping element (8, 58, 108, 158), wherein preferably the inner diameter is reduced to such an extent that the discharge piston (3, 53, 103, 153) has a larger outer diameter than the inner diameter reduced by the at least one clamping element (8, 58, 108, 158). 6. The bone cement applicator according to any one of the preceding claims, characterized in that the at least one clamping element (8, 58, 108, 158) is a circumferential closed bead or cutouts of a circumferential bead or at least two circumferential closed beads spaced apart from one another in the axial direction or at least two cutouts of a circumferential bead spaced apart from one another in the axial direction. 7. The bone cement applicator according to any one of the preceding claims, characterized in that the at least one clamping element (8, 58, 108, 158) has a chamfer on a front side of the at least one clamping element (8, 58, 108, 158) facing the front side of the cartridge (1, 51, 101, 151), 58, 108, 158) and a chamfer on a rear side of the at least one clamping element (8, 58, 108, 158) facing the rear side of the cartridge (1, 51, 101, 151), wherein the chamfers are arranged perpendicular to the cylinder axis of the cartridge (1, 51, 101, 151). 8. The bone cement applicator according to any one of the preceding claims, characterized in that two or more clamping elements (158) are arranged on the inner wall of the cylindrical interior (2, 52, 102, 152) at a distance from one another axially with respect to the cylinder axis of the interior (2, 52, 102, 152). 9. The bone cement applicator according to any one of the preceding claims, characterized in that an outer wall of the discharge piston (3, 53, 103, 153) facing the inner wall of the cylindrical inner space (2, 52, 102, 152) has an axial extent which is at least equal to the axial extent of the at least one clamping element (8, 58, 108, 158), wherein preferably the axial extension of the outer wall of the discharge piston (3, 53, 103, 153) is at least twice as large as the axial extension of the at least one clamping element (8, 58, 108, 158). 10. The bone cement applicator according to any one of the preceding claims, characterized in that an outer wall of the discharge piston (3, 53, 103, 153) facing the inner wall of the cylindrical inner space (2, 52, 102, 152) is designed as a closed hollow cylinder, and/or the outer wall of the discharge piston (3, 53, 103, 53, 103, 153) clamped in the cartridge (1, 51, 101, 151) can be released by the action of a force which is directed along the cylinder axis of the cartridge (1, 51, 101, 151) and can be pressed in the direction of the front side of the cartridge (1, 51, 101, 151). 11. The bone cement applicator according to any one of the preceding claims, characterized in that the outer cylindrical lateral surface (44, 94, 144, 194) of the discharge piston (3, 53, 103, 153) consists of a thermoplastic material, wherein preferably the thermoplastic material is selected from at least one of the plastics materials polyethylene, polypropylene, polyamide, polyethylene terephthalate and polybutylene terephthalate, and/or the bone cement applicator has a sealing piston (9, 159) which can be connected to the discharge piston (3, 153), wherein the discharge piston (3, 153) Comprises the outer cylindrical lateral surface (44, 194) and a passage which is permeable to gases but impermeable to the cement powder, and wherein the passage in the discharge piston (3, 153) can be tightly closed by the sealing piston (9, 159), in particular by pushing the sealing piston (9, 159) into an opening of the dispensing piston (3, 153) which is open in the direction of the rear side of the cartridge (1, 151), wherein the passage is arranged within the opening of the dispensing piston (3, 153). 12. Method for producing a bone cement, in particular a pasty polymethyl methacrylate bone cement, wherein the bone cement paste is produced from a cement powder and a monomer liquid with a bone cement applicator according to one of the preceding claims, characterized by the following sequential steps:   A) Filling the cement powder and the monomer liquid into the cylindrical interior (2, 52, 102, 152) of the cartridge (1, 51, 101, 151) or the monomer liquid to the cement powder in the cylindrical interior (2, 52, 102, 152) of the cartridge (1, 51, 101, 151),   B) Closing the cartridge (1, 51, 101, 151) by pressing the dispensing piston (3, 53, 103, 153) into the cylindrical interior (2, 52, 102, 152) of the cartridge (1, 51, 101, 151),   C) Clamping the dispensing plunger (3, 53, 103, 153) on the rear side of the cartridge (1, 51, 101, 151) with the at least one clamping element (8, 58, 108, 158),   D) Mixing the bone cement in the cylindrical interior (2, 52, 102, 152) of the cartridge (1, 51, 101, 151) by moving the mixing member (6) in the cylindrical interior (2, 52, 102, 152) of the cartridge (1, 51, 101, 151),   E) Pressing the dispensing pistons (3, 53, 103, 153) in the direction of the front side of the cartridge (1, 51, 101, 151), wherein the clamping of the at least one clamping element (8, 58, 108, 158) is released, and   F) Pressing the bone cement out of the cartridge (1, 51, 101, 151) through the discharge opening (5) by advancing the discharge piston (3, 53, 103, 153) in the interior (2, 52, 102, 152) of the cartridge (1, 51, 101, 151) in the direction of the cartridge head (4). 13. The method of claim 12, characterized in that the cement powder is filled into the interior (2, 52, 102, 152) of the cartridge (1, 51, 101, 151) before the monomer liquid or is already contained in the cylindrical interior (2, 52, 102, 152) of the cartridge (1, 51, 101, 151). 14. The method of claim 12 or 13, characterized in that when clamping the dispensing piston (3, 53, 103, 153) in step C), the dispensing piston (3, 53, 103, 153) is elastically deformed in the direction of the cylinder axis of the cylindrical interior (2, 52, 102, 152) of the cartridge (1, 51, 101, 151), wherein preferably a tubular extension on the rear side of the dispensing piston (3, 53, 103, 153), the outer surface of which is delimited at least in regions by the outer cylindrical lateral surface (44, 94, 144, 194) of the dispensing piston (3, 53, 103, 153), is pressed by the at least one clamping element (8, 58, 108, 158) in the direction of the cylinder axis of the cylindrical interior (2, 52, 102, 152) of the cartridge (1, 51, 101, 151). 15. The method of any one of claims 12 to 14, characterized in that in step D) the mixing member (6) is moved with the mixing rod (7, 57, 157) and is subsequently pulled with the mixing rod (7, 57, 157) against a front side of the discharge plunger (3, 53, 103, 153) facing the front side of the cartridge (1, 51, 101, 151) and the mixing rod (7, 57, 157) is subsequently broken off, and/or before step E) the bone cement applicator is inserted into a press-out device with an axially movable and drivable plunger, wherein in step E) and in step F) the discharge plunger (3, 53, 103, 153) is driven by the plunger, and/or the discharge opening (5) is closed and is opened before step E) or F).
法律状态
PENDING
专利类型码
A1
国别省市代码
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