It is important the the phenol
in almond oil does not spray into the surgeon's eyes when he is
injecting the patient, so there should be a luer lock to connect the
needle to the syringe. The luer lock prevents separation of the
syringe from the needle.
The syringe has three loops on
it, so the surgeon can aspirate and inject with one hand, (the surgeon
uses his other hand to hold the proctoscope steady). The thumb is
inserted through the large ring at the end of the plunger and the
index and middle fingers through the two rings attached to the
barrell.
The needle has an angle on it
to facilitate entry into the submucosa. If there was no angle the
surgeon would be more likely to inject too deeply. The surgon
introduces the needle into the anal canal through the proctoscope with
the concavity of the bend pointing into the middle of the anal canal.
