Author
Klaus Dr.Med.Dr.Med.Habil. Draenert
Bio: Klaus Dr.Med.Dr.Med.Habil. Draenert is an academic researcher. The author has contributed to research in topics: Composite number & Methacrylic acid. The author has an hindex of 5, co-authored 6 publications receiving 93 citations.
Topics: Composite number, Methacrylic acid, Bone cement, Prepolymer
Papers
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Patent•
21 Oct 1991
TL;DR: In this paper, a method and a material of a three-dimensional molded body of the composite a balkchenartiges each other in communication system encloses cavity, the material is producible that a scaffold is created by serving as a placeholder molded articles are prepared from which the moldings removed and which is filled subsequently by a casting and sprayable form mass.
Abstract: The invention relates to a method and a material of a three-dimensional molded body of the composite a balkchenartiges each other in communication system encloses cavity. The material is producible that a scaffold is created by serving as a placeholder molded articles are prepared from which the moldings removed and which is filled subsequently by a casting and sprayable form mass, it can be removed by dissolving and melting after its hardening can.
27 citations
Patent•
06 Feb 1995
TL;DR: In this article, a process for producing a positive material with a skeleton made of shell-like structures and an interconnecting pore system designed between the skeleton structures was described, and a negative material made of shaped bodies interconnected by bridges.
Abstract: A process is disclosed for producing a positive-material with a skeleton made of shell-like structures and an interconnecting pore system designed between the skeleton structures. Also disclosed is a process for producing a negative-material made of shaped bodies interconnected by bridges, a process for producing a positive/negative-material, materials produced by this process and their use as bone replacement materials, implants, filters and drug delivery systems. According to this process deformable shaped bodies in bulk are poured into a mould that forms a negative model of the material.
24 citations
Patent•
06 Feb 1995
TL;DR: In this paper, a verfahren zur Herstellung eines Positiv/Negativ-Werkstoffs with einem schalenartigen Gerust and einem zwischen dem Gerust ausgebildeten Interkonnektierenden Poren system is found.
Abstract: Die Erfindung betrifft ein Verfahren zur Herstellung eines Positiv-Werkstoffs mit einem schalenartigen Gerust und einem zwischen dem Gerust ausgebildeten Interkonnektierenden Porensystem, ein Verfahren zur Herstellung eines Negativ-Werkstoffs aus miteinander uber Stege verbundenen Formkorpern, ein Verfahren zur Herstellung eines Positiv/Negativ-Werkstoffs, die mit diesen Verfahren herstellbaren Werkstoffe sowie deren Verwendung als Knochenersatzwerkstoff, Implantat, Filter und 'drug delivery system'. Bei dem erfindungsgemasen Herstellungsverfahren wird von einer Schuttung aus deformierbaren Formkorpern in einer Form als Negativmodell des Werkstoffs ausgegangen.
16 citations
Patent•
09 Sep 1985
TL;DR: BoneCement as mentioned in this paper is composed of a mixture of particulate polyacrylate and polymethacryl prepolymers, monomeric acrylic and/or methacrylic acid derivatives, a polymerisation catalyst and, optionally, a stabiliser and an activator.
Abstract: 1. Bone cement composed of a mixture of particulate polyacrylate and/or polymethacrylate prepolymers, monomeric acrylic and/or methacrylic acid derivatives, a polymerisation catalyst and, optionally, a stabiliser and an activator, wherein the entire specific surface of the prepolymer particles in the bone cement is enlarged by preteating the particles mechanically and/or chemically before mixing them.
16 citations
Patent•
10 Jul 1985
TL;DR: The erfindungsgemasen Vorrichtung as discussed by the authors weist einen abdichtbaren Behalter (8) auf, in dem der Knochenzement vor der Applikation mit einstellbarem Druck vorkomprimiert and aus dem heraus er anschliesend with steuerbarem DRD appliziert wird.
Abstract: Die Vorrichtung weist einen abdichtbaren Behalter (8) auf, in dem der Knochenzement vor der Applikation mit einstellbarem Druck vorkomprimiert und aus dem heraus er anschliesend mit steuerbarem Druck appliziert wird. Mit der erfindungsgemasen Vorrichtung und dem erfindungsgemasen Verfahren lassen sich Blasenbildungen im Knochenzement unterdrucken, und es wird eine gezielte Schichtung des Knochenzementes bei der Applikation erzielt.
10 citations
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Patent•
27 Jan 2000
TL;DR: An expandable spacer as discussed by the authors is an axial tube having a surface, a proximal end and a distal end and length, wherein, said surface defines a plurality of slits, such that when said tube is axially compressed, said extensions extend out of said surface and define a geometry of an expanded spacer.
Abstract: An expandable spacer, comprising: an axial tube having a surface, a proximal end and a distal end and a length, wherein, said surface defines a plurality of slits, said plurality of slits defining at least two axially displaced extensions, such that when said tube is axially compressed, said extensions extend out of said surface and define a geometry of an expanded spacer. Preferably the spacer is adapted to be inserted between two spinal vertebrae of a human.
370 citations
Patent•
19 Feb 1997TL;DR: In this article, an interbody fusion device (10') in one embodiment includes a load bearing body (11') defining a hollow interior or chamber (15) for receiving an osteogenic material.
Abstract: An interbody fusion device (10') in one embodiment includes a load bearing body (11') defining a hollow interior or chamber (15) for receiving an osteogenic material. In another embodiment, the tapered body is solid and formed of a porous biocompatible material having sufficient structural integrity to maintain the intradiscal space and normal curvature. The material is preferably a porous tantalum composite having fully interconnected pores to facilitate complete bone tissue ingrowth into the implant. A cap (300) is also provided to block the opening (15a) of the hollow fusion device (10'). The cap (300) includes an occlusion body (301) and an elongated anchor (310). In some embodiments the anchor includes a lip (315) which is engageable to openings (24') in the body wall. Tools are also provided for manipulating caps for interbody fusion devices. In one embodiment the tool includes a cap-engaging tip for engaging a threaded tool hole (320) in the cap (300).
244 citations
Patent•
31 Jul 2005
TL;DR: Bone Cement is a bone cement comprising a first component and a second component, wherein contacting the first component produces a mixture which attains a high viscosity an initial period and remains relatively stable for a working time of at least 5 minutes after the initial setting period, and the mixture is suitable for invivo use as mentioned in this paper.
Abstract: A bone cement comprising a first component and a second component, wherein contacting the first component and the second component produces a mixture which attains a high viscosity an initial period and the viscosity of the mixture remains relatively stable for a working time of at least 5 minutes after the initial setting period, and the mixture is suitable for in-vivo use.
231 citations
Patent•
27 Feb 2007
TL;DR: In this article, an intervertebral spacer implant (80) is provided with a retention mechanism (86) to help alleviate expulsion and movement of the implant when placed in the spine.
Abstract: An intervertebral spacer implant (80) is provided with a retention mechanism (86) to help alleviate expulsion and movement of the implant when placed in the spine while providing an implant that is easier to insert in the spine. In one embodiment the retention mechanism comprises a keel on at least one of the inferior or superior faces of the spacer implant preferably extending in an anterior-posterior direction. In another embodiment the implant comprises a spacer (84) and a plate (82), the plate comprising a supplemental or alternative retention mechanism. In one embodiment the retention mechanism comprises one or more holes (88) in the anterior end of the plate. In yet another embodiment, the retention mechanism comprises one or more blades that are in a first position when inserted and are preferably rotated to a second position that engages the superior and inferior vertebrae.
145 citations
Patent•
06 Nov 2009
TL;DR: An implant for insertion into a disc space between vertebrae, wherein the implant includes a spacer portion, a plate portion coupled to the spacer, two bone fixation elements for engaging the vertebraes and a retention mechanism for preventing the bone fixation element from postoperatively backing-out of the plate portion, is described in this article.
Abstract: An implant for insertion into a disc space between vertebrae, wherein the implant includes a spacer portion, a plate portion coupled to the spacer portion, two bone fixation elements for engaging the vertebrae and a retention mechanism for preventing the bone fixation elements from postoperatively backing-out of the plate portion The retention mechanism may be in the form of a spring biased snapper element that is biased into communication with the bone fixation elements so that once the bone fixation element advances past the snapper element, the snapper element is biased back to its initial position in which the snapper element interfaces with the bone fixation elements Alternatively, the retention mechanism may be in the form of a propeller rotatable between a first position in which the bone fixation elements are insertable to a second position where the bone fixation elements are prevented from backing-out
118 citations