Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 460-468 |
| Seitenumfang | 9 |
| Fachzeitschrift | Medical Engineering and Physics |
| Jahrgang | 37 |
| Ausgabenummer | 5 |
| Publikationsstatus | Veröffentlicht - 1 Mai 2015 |
Abstract
Bone-attached robots and microstereotactic frames, intended for deep brain stimulation and minimally invasive cochlear implantation, typically attach to a patient's skull via bone anchors. A rigid and reliable link between such devices and the skull is mandatory in order to fulfill the high accuracy demands of minimally invasive procedures while maintaining patient safety. In this paper, a method is presented to experimentally characterize the mechanical properties of the anchor-bone linkage. A custom-built universal testing machine is used to measure the pullout strength as well as the spring constants of bone anchors seated in four different bone substitutes as well as in human cranial bone. Furthermore, the angles at which forces act on the bone anchors are varied to simulate realistic conditions. Based on the experimental results, a substitute material that has mechanical properties similar to those of cranial bone is identified. The results further reveal that the pullout strength of the investigated anchor design is sufficient with respect to the proposed application. However, both the measured load capacity as well as the spring constants vary depending on the load angles. Based on these findings, an alternative bone anchor design is presented and experimentally validated. Furthermore, the results serve as a basis for stiffness simulation and optimization of bone-attached microstereotactic frames.
ASJC Scopus Sachgebiete
- Biochemie, Genetik und Molekularbiologie (insg.)
- Biophysik
- Ingenieurwesen (insg.)
- Biomedizintechnik
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in: Medical Engineering and Physics, Jahrgang 37, Nr. 5, 01.05.2015, S. 460-468.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Mechanical characterization of bone anchors used with a bone-attached, parallel robot for skull surgery
AU - Kobler, Jan Philipp
AU - Prielozny, Lenka
AU - Lexow, G. Jakob
AU - Rau, Thomas S.
AU - Majdani, Omid
AU - Ortmaier, Tobias
N1 - Funding information: This work was funded by the German Research Foundation (DFG). The project numbers are OR 196/10-1 and MA 4038/6-1.
PY - 2015/5/1
Y1 - 2015/5/1
N2 - Bone-attached robots and microstereotactic frames, intended for deep brain stimulation and minimally invasive cochlear implantation, typically attach to a patient's skull via bone anchors. A rigid and reliable link between such devices and the skull is mandatory in order to fulfill the high accuracy demands of minimally invasive procedures while maintaining patient safety. In this paper, a method is presented to experimentally characterize the mechanical properties of the anchor-bone linkage. A custom-built universal testing machine is used to measure the pullout strength as well as the spring constants of bone anchors seated in four different bone substitutes as well as in human cranial bone. Furthermore, the angles at which forces act on the bone anchors are varied to simulate realistic conditions. Based on the experimental results, a substitute material that has mechanical properties similar to those of cranial bone is identified. The results further reveal that the pullout strength of the investigated anchor design is sufficient with respect to the proposed application. However, both the measured load capacity as well as the spring constants vary depending on the load angles. Based on these findings, an alternative bone anchor design is presented and experimentally validated. Furthermore, the results serve as a basis for stiffness simulation and optimization of bone-attached microstereotactic frames.
AB - Bone-attached robots and microstereotactic frames, intended for deep brain stimulation and minimally invasive cochlear implantation, typically attach to a patient's skull via bone anchors. A rigid and reliable link between such devices and the skull is mandatory in order to fulfill the high accuracy demands of minimally invasive procedures while maintaining patient safety. In this paper, a method is presented to experimentally characterize the mechanical properties of the anchor-bone linkage. A custom-built universal testing machine is used to measure the pullout strength as well as the spring constants of bone anchors seated in four different bone substitutes as well as in human cranial bone. Furthermore, the angles at which forces act on the bone anchors are varied to simulate realistic conditions. Based on the experimental results, a substitute material that has mechanical properties similar to those of cranial bone is identified. The results further reveal that the pullout strength of the investigated anchor design is sufficient with respect to the proposed application. However, both the measured load capacity as well as the spring constants vary depending on the load angles. Based on these findings, an alternative bone anchor design is presented and experimentally validated. Furthermore, the results serve as a basis for stiffness simulation and optimization of bone-attached microstereotactic frames.
KW - Biomechanics
KW - Bone anchor
KW - Mechanical characterization
KW - Surgical robotics
UR - http://www.scopus.com/inward/record.url?scp=84928212858&partnerID=8YFLogxK
U2 - 10.1016/j.medengphy.2015.02.012
DO - 10.1016/j.medengphy.2015.02.012
M3 - Article
C2 - 25771430
AN - SCOPUS:84928212858
VL - 37
SP - 460
EP - 468
JO - Medical Engineering and Physics
JF - Medical Engineering and Physics
SN - 1350-4533
IS - 5
ER -