A Nitinol Based Flexor Tendon Fixation Device: Gapping and Tensile Strength Measurements in Cadaver Flexor TendonSource: Journal of Biomechanical Engineering:;2014:;volume( 136 ):;issue: 001::page 14501DOI: 10.1115/1.4025779Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this study, a new nitinol based fixation device was investigated for use in repairing severed digital flexor tendons. The device, composed of superelastic nitinol, is tubular in shape with inward facing tines for gripping tissue. Its cellular structure was designed such that it has a large effective Poisson's ratio, which facilitates a “finger trap†effect. This allows for reduced tendon compression during a resting state (to permit vascular perfusion) and increased compression during loading (to drive the tines into the tissue for gripping). To test the feasibility of using this device for flexor tendon repair, it was tested on cadaver flexor digitorum profundus tendons. The tendons were excised, cut in the region corresponding to a zone II laceration, and repaired using the device. The device was easy to install and did not prevent the tendon from bending. Constant strain rate tensile testing revealed a mean tensile strength of 57.6 آ±â€‰7.7 N, with a force of 53.2 آ±â€‰7.8 N at a 2 mm gap. This exceeds the suggested primary repair strength of 45 N, which has been proposed as the necessary strength for enabling early mobilization. Although considerable future studies will be needed to determine the suitability of the new repair device for clinical use, this study demonstrates the feasibility of utilizing a tubular, nitinol repair device for flexor tendon fixation.
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| contributor author | Reese, Shawn P. | |
| contributor author | Kubiak, Erik N. | |
| date accessioned | 2017-05-09T01:05:08Z | |
| date available | 2017-05-09T01:05:08Z | |
| date issued | 2014 | |
| identifier issn | 0148-0731 | |
| identifier other | bio_136_01_014501.pdf | |
| identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/153928 | |
| description abstract | In this study, a new nitinol based fixation device was investigated for use in repairing severed digital flexor tendons. The device, composed of superelastic nitinol, is tubular in shape with inward facing tines for gripping tissue. Its cellular structure was designed such that it has a large effective Poisson's ratio, which facilitates a “finger trap†effect. This allows for reduced tendon compression during a resting state (to permit vascular perfusion) and increased compression during loading (to drive the tines into the tissue for gripping). To test the feasibility of using this device for flexor tendon repair, it was tested on cadaver flexor digitorum profundus tendons. The tendons were excised, cut in the region corresponding to a zone II laceration, and repaired using the device. The device was easy to install and did not prevent the tendon from bending. Constant strain rate tensile testing revealed a mean tensile strength of 57.6 آ±â€‰7.7 N, with a force of 53.2 آ±â€‰7.8 N at a 2 mm gap. This exceeds the suggested primary repair strength of 45 N, which has been proposed as the necessary strength for enabling early mobilization. Although considerable future studies will be needed to determine the suitability of the new repair device for clinical use, this study demonstrates the feasibility of utilizing a tubular, nitinol repair device for flexor tendon fixation. | |
| publisher | The American Society of Mechanical Engineers (ASME) | |
| title | A Nitinol Based Flexor Tendon Fixation Device: Gapping and Tensile Strength Measurements in Cadaver Flexor Tendon | |
| type | Journal Paper | |
| journal volume | 136 | |
| journal issue | 1 | |
| journal title | Journal of Biomechanical Engineering | |
| identifier doi | 10.1115/1.4025779 | |
| journal fristpage | 14501 | |
| journal lastpage | 14501 | |
| identifier eissn | 1528-8951 | |
| tree | Journal of Biomechanical Engineering:;2014:;volume( 136 ):;issue: 001 | |
| contenttype | Fulltext |