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  1. Article ; Online: A biomechanical study of headless compression screws versus a locking plate in radial head fracture fixation.

    Rebgetz, Paul R / Daniele, Luca / Underhill, Ian D / Öchsner, Andreas / Taylor, Fraser J

    Journal of shoulder and elbow surgery

    2019  Volume 28, Issue 4, Page(s) e111–e116

    Abstract: Hypothesis: Fixation of a 3-part radial head fracture with cannulated compression screws will show equivalent stiffness to a locking plate under axial load. Debate exists regarding the management of Mason type III fractures, with many believing that ... ...

    Abstract Hypothesis: Fixation of a 3-part radial head fracture with cannulated compression screws will show equivalent stiffness to a locking plate under axial load. Debate exists regarding the management of Mason type III fractures, with many believing that open reduction and internal fixation provides advantages over other options. By virtue of their subarticular placement, screw fixation is less likely to cause impingement compared with plate fixation, which can result in loss of rotation and requirement for hardware removal. Insufficient fixation stability can lead to nonunions, necrosis of the radial head, pain, and instability. We tested the mechanical stability of fixation of simulated radial head fractures using headless compression screws compared with standard plate construct.
    Methods: Standardized test constructs were created with repeatable osteotomy cuts and hardware placement on each Synbone model (Synbone AG, Malans, Switzerland). We presectioned 22 proximal radius Synbone models to simulate a 3-part radial head fracture. The models were fixed using a radial head locking plate or headless compression screws in a tripod construct. The constructs were potted into a compression test jig using 2-part epoxy resin. Compression testing was performed using a 30-kN Instron Universal machine (Instron, Norwood, MA, USA). The compression tool was spherical, representing the surface of the capitellum.
    Results: There was no significant difference between the stiffness of the Synbone constructs under axial load.
    Conclusion: There was no significant difference between fixation stiffness of a 3-part radial head fracture with headless compression screws in a tripod structure vs. a locking plate in Synbone. Further study is required to allow clinical application.
    MeSH term(s) Biomechanical Phenomena ; Bone Plates ; Bone Screws ; Elbow Joint ; Epiphyses/injuries ; Epiphyses/surgery ; Female ; Fracture Fixation, Internal/instrumentation ; Humans ; Models, Anatomic ; Osteotomy ; Radius Fractures/surgery
    Language English
    Publishing date 2019-01-24
    Publishing country United States
    Document type Comparative Study ; Journal Article
    ZDB-ID 1170782-3
    ISSN 1532-6500 ; 1058-2746
    ISSN (online) 1532-6500
    ISSN 1058-2746
    DOI 10.1016/j.jse.2018.10.008
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 3973: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  2. Article ; Online: A composite fibre optic catheter for monitoring peristaltic transit of an intra-luminal bead.

    Arkwright, John W / Underhill, Ian D / Dodds, Kelsi N / Brookes, Simon J H / Costa, Marcello / Spencer, Nick J / Dinning, Phil G

    Journal of biophotonics

    2016  Volume 9, Issue 3, Page(s) 305–310

    Abstract: A fibre optic motion sensor has been developed for monitoring the proximity and direction of motion of a ferrous bead travelling axial to the sensor. By integrating an array of these sensors into our previously developed fibre optic manometry catheters ... ...

    Abstract A fibre optic motion sensor has been developed for monitoring the proximity and direction of motion of a ferrous bead travelling axial to the sensor. By integrating an array of these sensors into our previously developed fibre optic manometry catheters we demonstrate simultaneous detection of peristaltic muscular activity and the associated motion of ferrous beads through a colonic lumen. This allows the motion of solid content to be temporally and spatially related to pressure variations generated by peristaltic contractions without resorting to videoflouroscopy to track the motion of a radio opaque bolus. The composite catheter has been tested in an in-vitro animal preparation consisting of excised sections of rabbit colon. Cut-away image of the fibre optic motion sensor showing the location of the fibre Bragg gratings and the rare earth magnet.
    MeSH term(s) Animals ; Catheters ; Colon/physiology ; Gastrointestinal Motility ; Iron/chemistry ; Iron/metabolism ; Microspheres ; Optical Fibers ; Rabbits
    Chemical Substances Iron (E1UOL152H7)
    Language English
    Publishing date 2016-03
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2390063-5
    ISSN 1864-0648 ; 1864-063X
    ISSN (online) 1864-0648
    ISSN 1864-063X
    DOI 10.1002/jbio.201500187
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 6723: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

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  3. Article ; Online: A fibre optic catheter for simultaneous measurement of longitudinal and circumferential muscular activity in the gastrointestinal tract.

    Arkwright, John W / Blenman, Neil G / Underhill, Ian D / Maunder, Simon A / Spencer, Nicholas J / Costa, Marcello / Brookes, Simon J / Szczesniak, Michael M / Dinning, Phil G

    Journal of biophotonics

    2011  Volume 4, Issue 4, Page(s) 244–251

    Abstract: Diagnostic catheters based on fibre Bragg gratings (FBG's) are proving to be highly effective for measurement of the muscular activity associated with motility in the human gut. While the primary muscular contractions that generate peristalsis are ... ...

    Abstract Diagnostic catheters based on fibre Bragg gratings (FBG's) are proving to be highly effective for measurement of the muscular activity associated with motility in the human gut. While the primary muscular contractions that generate peristalsis are circumferential in nature, it has long been known that there is also a component of longitudinal contractility present, acting in harmony with the circumferential component to improve the overall efficiency of material movement. We report the detection of longitudinal motion in mammalian intestine using an FBG technique that should be viable for similar detection in humans. The longitudinal sensors have been combined with our previously reported FBG pressure sensing elements to form a composite catheter that allows the relative phase between the two components to be detected. The catheter output has been validated using video mapping in an ex-vivo rabbit ileum preparation.
    MeSH term(s) Animals ; Catheters ; Fiber Optic Technology/instrumentation ; Fiber Optic Technology/methods ; Gastrointestinal Motility ; Gastrointestinal Tract/metabolism ; Gastrointestinal Tract/pathology ; Male ; Muscle Contraction ; Rabbits ; Sensitivity and Specificity ; Time Factors
    Language English
    Publishing date 2011-04
    Publishing country Germany
    Document type Evaluation Studies ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2390063-5
    ISSN 1864-0648 ; 1864-063X
    ISSN (online) 1864-0648
    ISSN 1864-063X
    DOI 10.1002/jbio.201000056
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 6723: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

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  4. Article ; Online: Design of a high-sensor count fibre optic manometry catheter for in-vivo colonic diagnostics.

    Arkwright, John W / Underhill, Ian D / Maunder, Simon A / Blenman, Neil / Szczesniak, Michal M / Wiklendt, Lukasz / Cook, Ian J / Lubowski, David Z / Dinning, Phil G

    Optics express

    2009  Volume 17, Issue 25, Page(s) 22423–22431

    Abstract: The design of a fibre Bragg grating based manometry catheter for in-vivo diagnostics in the human colon is presented. The design is based on a device initially developed for use in the oesophagus, but in this instance, longer sensing lengths and ... ...

    Abstract The design of a fibre Bragg grating based manometry catheter for in-vivo diagnostics in the human colon is presented. The design is based on a device initially developed for use in the oesophagus, but in this instance, longer sensing lengths and increased flexibility were required to facilitate colonoscopic placement of the device and to allow access to the convoluted regions of this complex organ. The catheter design adopted allows the number of sensing regions to be increased to cover extended lengths of the colon whilst maintaining high flexibility and the close axial spacing necessary to accurately record pertinent features of peristalsis. Catheters with 72 sensing regions with an axial spacing of 1 cm have been assembled and used in-vivo to record peristaltic contractions in the human colon over a 24hr period. The close axial spacing of the pressure sensors has, for the first time, identified the complex nature of propagating sequences in both antegrade (towards the anus) and retrograde (away from the anus) directions in the colon. The potential to miss propagating sequences at wider sensor spacings is discussed and the resultant need for close axial spacing of sensors is proposed.
    MeSH term(s) Catheterization ; Colon/physiopathology ; Computer-Aided Design ; Constipation/diagnosis ; Constipation/physiopathology ; Equipment Design ; Equipment Failure Analysis ; Female ; Fiber Optic Technology/instrumentation ; Humans ; Manometry/instrumentation ; Pressure ; Refractometry/instrumentation ; Reproducibility of Results ; Sensitivity and Specificity ; Transducers
    Language English
    Publishing date 2009-12-07
    Publishing country United States
    Document type Evaluation Studies ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.17.022423
    Database MEDical Literature Analysis and Retrieval System OnLINE

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