@article{DA,
      url = {http://digitalcollections.ohsu.edu/record/6825},
      title = {Artificial heart valve},
      abstract = {Digital scan of a 35mm slide. Image of a ball-and-cage  style artificial heart valve with protruding metal hooks.  The plastic ball has been removed and set next to the cage  on a green background, with a ruler included to indicate  size. The metal hooks were meant to grab onto tissue as the  valve was rotated into place.},
      number = {DA},
      doi = {https://doi.org/10.6083/M4930RTH},
      recid = {6825},
}