🧵regarding the comparative ability of 3 different commonly used surgical drains to evacuate Italian salad dressing from a mason jar: a pilot study.
(1/ )
(1/ )
19 Fr round Blake drains and 10 mm flat JP drains may be used in similar situations.
The 10 mm flat JP drain comes in two varieties: one with side holes and one that is fluted (see below).
Thier ability to evacuate a heterogenous fluid with particulate matter was compared.
The 10 mm flat JP drain comes in two varieties: one with side holes and one that is fluted (see below).
Thier ability to evacuate a heterogenous fluid with particulate matter was compared.
Each of the kinds of drains was cut to the same length and the external tubings were shorted by 20 cm. Each was tested as to its ability to evacuate the Italian dressing over a 5 minute period.
The 19 Fr round Blake drain evacuated 20 ml of the dressing in that time period. Flow had significantly slowed at the end.
Postmortem exam showed clogging at the (critically important) proximal portion of the drain.
Postmortem exam showed clogging at the (critically important) proximal portion of the drain.
The 10 mm flat JP version with side holes evacuated 45 ml, and it was clearly still flowing at the end of the 5 minutes.
Postmortem examination of the drain showed minimal clogging.
Postmortem examination of the drain showed minimal clogging.
The 10 mm flat JP of the 'fluted' variety drained 20 ml of the dressing.
Postmortem exam showed significant clogging of the fluted areas, especially the proximal portion.
Postmortem exam showed significant clogging of the fluted areas, especially the proximal portion.
In summary, I concluded that the flat 10 mm JP drain with side holes showed a trend toward outperforming both the 19 Fr round Blake drain and the 10 mm JP drain of the 'fluted' variety (p=0.06).
The author may consider using this type of drain more often.
The author may consider using this type of drain more often.
Limitations of this study include its nonrandomized and nonblinded nature. Also, the findings may not be generalizable to other types of salad dressings. Further study is needed.
Addendum:
Note the difference in drain output from the 19 Fr Blake when the external tubing was shortened by 20 cm (on the left), as compared to when it was not shortened (on the right).
Poiseuille’s law is hereby confirmed.
Note the difference in drain output from the 19 Fr Blake when the external tubing was shortened by 20 cm (on the left), as compared to when it was not shortened (on the right).
Poiseuille’s law is hereby confirmed.
(Late addendum)
Someone pointed out the existence of this study, which explored drain characteristics in a much more extensive and rigorous manner. Of note, side holes > fluted version here also.
pubmed.ncbi.nlm.nih.gov
Someone pointed out the existence of this study, which explored drain characteristics in a much more extensive and rigorous manner. Of note, side holes > fluted version here also.
pubmed.ncbi.nlm.nih.gov
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