Identification of factors influencing insertion characteristics of cochlear implant electrode carriers
Insertion studies in artificial cochlea models (aCM) are used for the analysis of insertion characteristics of different cochlear implant electrode carrier (EC) designs by measuring insertion forces. These forces are summed forces due to the measuring position which is directly underneath the aCM. T...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2019-09-01
|
| Series: | Current Directions in Biomedical Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/cdbme-2019-0111 |
| _version_ | 1828214182904856576 |
|---|---|
| author | Hügl Silke Aldag Nina Lenarz Thomas Rau Thomas S. Becker Alexander Glasmacher Birgit |
| author_facet | Hügl Silke Aldag Nina Lenarz Thomas Rau Thomas S. Becker Alexander Glasmacher Birgit |
| author_sort | Hügl Silke |
| collection | DOAJ |
| description | Insertion studies in artificial cochlea models (aCM) are used for the analysis of insertion characteristics of different cochlear implant electrode carrier (EC) designs by measuring insertion forces. These forces are summed forces due to the measuring position which is directly underneath the aCM. The current hypothesis is that they include dynamic friction forces during the insertion process and the forces needed to bend an initially straight EC into the curved form of the aCM. For the purposes of the present study, straight EC substitutes with a constant diameter of 0.7 mm and 20.5 mm intracochlear length were fabricated out of silicone in two versions with different stiffness by varying the number of embedded wires. The EC substitutes were inserted into three different models made of polytetrafluoroethylene (PTFE), each model showing only one constant radius. Three different insertion speeds were used (0.11 / 0.4 / 1.6 mm/s) with an automated insertion test bench. For each parameter combination (curvature, speed, stiffness) twelve insertions were conducted. Measurements included six full insertions and six paused insertions. Paused insertions include a ten second paused time interval without further insertion movement each five millimetres. Measurements showed that dynamic and static components of the measured summed forces can be identified. Dynamic force components increase with increased insertion speeds and also with increased stiffness of the EC substitutes. Both force components decrease with larger radius of the PTFE model. After the insertion, the EC substitutes showed a curved shape, which indicates a plastic deformation of the embedded wires due to the insertion into the curved models. The results can be used for further research on an analytical model to predict the insertions forces of a specific combination of selected parameters as insertion speed and type of EC, combined with given factors such as cochlear geometry. |
| first_indexed | 2024-04-12T15:00:29Z |
| format | Article |
| id | doaj.art-e8011f861c7e4f158ce1ea02c76c711d |
| institution | Directory Open Access Journal |
| issn | 2364-5504 |
| language | English |
| last_indexed | 2024-04-12T15:00:29Z |
| publishDate | 2019-09-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Current Directions in Biomedical Engineering |
| spelling | doaj.art-e8011f861c7e4f158ce1ea02c76c711d2022-12-22T03:28:06ZengDe GruyterCurrent Directions in Biomedical Engineering2364-55042019-09-015144144310.1515/cdbme-2019-0111cdbme-2019-0111Identification of factors influencing insertion characteristics of cochlear implant electrode carriersHügl Silke0Aldag Nina1Lenarz Thomas2Rau Thomas S.3Becker Alexander4Glasmacher Birgit5Hannover Medical School, Department of Otolaryngology and Cluster of Excellence EXC 2177/1 “Hearing4all”, Carl-Neuberg-Strasse 1,Hannover, GermanyHannover Medical School, Department of Otolaryngology and Cluster of Excellence EXC 2177/1 “Hearing4all”, Carl-Neuberg-Strasse 1,Hannover, GermanyHannover Medical School, Department of Otolaryngology and Cluster of Excellence EXC 2177/1 “Hearing4all”, Carl-Neuberg-Strasse 1,Hannover, GermanyHannover Medical School, Department of Otolaryngology and Cluster of Excellence EXC 2177/1 “Hearing4all”, Carl-Neuberg-Strasse 1,Hannover, GermanyInstitute for Multiphase Processes, Leibniz University Hannover,Hanover, GermanyInstitute for Multiphase Processes, Leibniz University Hannover,Hanover, GermanyInsertion studies in artificial cochlea models (aCM) are used for the analysis of insertion characteristics of different cochlear implant electrode carrier (EC) designs by measuring insertion forces. These forces are summed forces due to the measuring position which is directly underneath the aCM. The current hypothesis is that they include dynamic friction forces during the insertion process and the forces needed to bend an initially straight EC into the curved form of the aCM. For the purposes of the present study, straight EC substitutes with a constant diameter of 0.7 mm and 20.5 mm intracochlear length were fabricated out of silicone in two versions with different stiffness by varying the number of embedded wires. The EC substitutes were inserted into three different models made of polytetrafluoroethylene (PTFE), each model showing only one constant radius. Three different insertion speeds were used (0.11 / 0.4 / 1.6 mm/s) with an automated insertion test bench. For each parameter combination (curvature, speed, stiffness) twelve insertions were conducted. Measurements included six full insertions and six paused insertions. Paused insertions include a ten second paused time interval without further insertion movement each five millimetres. Measurements showed that dynamic and static components of the measured summed forces can be identified. Dynamic force components increase with increased insertion speeds and also with increased stiffness of the EC substitutes. Both force components decrease with larger radius of the PTFE model. After the insertion, the EC substitutes showed a curved shape, which indicates a plastic deformation of the embedded wires due to the insertion into the curved models. The results can be used for further research on an analytical model to predict the insertions forces of a specific combination of selected parameters as insertion speed and type of EC, combined with given factors such as cochlear geometry.https://doi.org/10.1515/cdbme-2019-0111insertion forceinsertion speedcochlear model |
| spellingShingle | Hügl Silke Aldag Nina Lenarz Thomas Rau Thomas S. Becker Alexander Glasmacher Birgit Identification of factors influencing insertion characteristics of cochlear implant electrode carriers Current Directions in Biomedical Engineering insertion force insertion speed cochlear model |
| title | Identification of factors influencing insertion characteristics of cochlear implant electrode carriers |
| title_full | Identification of factors influencing insertion characteristics of cochlear implant electrode carriers |
| title_fullStr | Identification of factors influencing insertion characteristics of cochlear implant electrode carriers |
| title_full_unstemmed | Identification of factors influencing insertion characteristics of cochlear implant electrode carriers |
| title_short | Identification of factors influencing insertion characteristics of cochlear implant electrode carriers |
| title_sort | identification of factors influencing insertion characteristics of cochlear implant electrode carriers |
| topic | insertion force insertion speed cochlear model |
| url | https://doi.org/10.1515/cdbme-2019-0111 |
| work_keys_str_mv | AT huglsilke identificationoffactorsinfluencinginsertioncharacteristicsofcochlearimplantelectrodecarriers AT aldagnina identificationoffactorsinfluencinginsertioncharacteristicsofcochlearimplantelectrodecarriers AT lenarzthomas identificationoffactorsinfluencinginsertioncharacteristicsofcochlearimplantelectrodecarriers AT rauthomass identificationoffactorsinfluencinginsertioncharacteristicsofcochlearimplantelectrodecarriers AT beckeralexander identificationoffactorsinfluencinginsertioncharacteristicsofcochlearimplantelectrodecarriers AT glasmacherbirgit identificationoffactorsinfluencinginsertioncharacteristicsofcochlearimplantelectrodecarriers |