Impedance Controlled Surgical Instrumentation (ICOS)
Fig. 1: Proposed test-bench.
Contact person
Project description
The hip joint replacement plays a major role in the endoprosthesis with over 150.000 first implantations in year 2008 in Germany. Because of the demographic change and the increasing survival expectation the number of implementation increases, which definitely continues in the future. Due to the fact, that the average life time of hip joints endoprosthesis is between 12 and 15 years, this increasing trend can also be observed at the revision of artificial hip joints, whereat in 2008 in Germany over 22.500 revisions were made.
The major part of artificial hip joints is cemented in the human skeleton. At the revision, the cement has to be removed completely to make sure that the new hip joint fits optimally stable. The removal of the cement is conventionally done by hammer or chisel, which is connected with a high mechanical force injection and with no real-time control. For this reason the risk of damaging the bone or the surrounding tissue is unavoidable.
Project goals
In this project we implement a real-time control for the removal of bone cement with spectral impedance analysis. One major challenge is the integration of the fast rotating milling head in the chain. The first goal will be the safe detection of the invasion of the cutting tool into the bone. Beyond that measuring setup will be extended by a l ocalisation of the pass through point and an EIT system. The navigation control will be adapted to the particular measurement setup. With the successful establishment of the measuring system, an expansion of the system on many different applications of the endoprosthesis is possible.
- Interruption of the milling process during invasion in the bone
- Localisation of the pass through point
- Controlling of the milling head navigation without a priori knowledge
- Controlling of the milling head navigation with a priori knowledge
- Controlling of the milling head navigation with EIT information