Principles of Biomedical Technology (Principles of Biomedical Science)

Unit 3: Unit 3.1 Nosocomial NightmarePBS 3.1Handling, Preparation, Storage and Disposal

Respond to a spill

Tell people, cover it, work from the outside in, wait, then lift. Learn why the instinct to wipe from the middle makes a small spill into a large one.

Builds on (2 levels back)curriculum · med confidence

Wiping moves material rather than removing it: A cloth dragged across a spill carries the material with it, so the direction you wipe decides whether the spill gets bigger or smaller.
Disinfectant needs its time: The same rule that governs a bench treatment governs a spill: the product has to sit before anything is lifted.

Prerequisites are inferred: pending teacher review.

Re-learn the skill with worked practice and clear examples.

Now handle the two things that make a spill worse than it looks: glass, and silence.

Step 1: Nothing sharp is picked up by hand

Broken glass in a treated spill is lifted with tongs, a dustpan or stiff card. A gloved hand is not protection against an edge, and it is easy to miss a fragment in a wet mess.

Step 2: Small spills are still reported

Reporting is how a room learns that a container leaks, a shelf is too high, or a step in a procedure produces splashes. A spill nobody hears about happens again next period.

Step 3: Check yourself before you check the bench

If a spill reached clothing or skin, that comes first. A stained coat is a warning that the barrier was breached, not something to deal with at the end.

Practice

A tube of culture breaks on the bench, leaving liquid and glass fragments. After the area has been covered and treated, how is the glass lifted?

Reviewed

A.By pouring the treated liquid and glass together into the sink
B.By hand, since gloves are already being worn for the spill
C.With tongs, a dustpan or stiff card, so nothing sharp meets a hand
D.By sweeping it toward the edge and catching it in a bag below

Show the worked solution ▾

Answer: C. With tongs, a dustpan or stiff card, so nothing sharp meets a hand

Step 1: Ask what gloves do against an edge: Very little. Examination gloves resist liquid, not cutting.
Step 2: Choose a tool that keeps the hand away: Tongs, a dustpan or stiff card put a rigid object between the hand and the fragments.

Why it's right: Examination gloves resist liquid and not cutting, and fragments are hard to see in a wet mess. A rigid tool keeps the hand away from every piece, including the ones nobody spotted.

Why the others miss:

A: A sink is not a disposal route for glass, and it puts fragments where the next person reaches in without looking.
B: Gloves give no protection against a sharp edge, and the wet surface makes small fragments almost impossible to see.
D: Sweeping toward an edge sends fragments over the side, and catching them in a soft bag puts an edge against a hand holding it.

Aligned to Handling, Preparation, Storage and Disposal · reading level ~grade 9

A few drops of stain land on a student's lab coat sleeve during Activity 3.1.6. What does that tell them, beyond the mark itself?

Reviewed

A.That the stain bottle is being stored at the wrong temperature
B.That the coat needs washing before the next lesson
C.That something reached the barrier, so the technique needs review
D.That the coat is doing its job and nothing further needs attention

Show the worked solution ▾

Answer: C. That something reached the barrier, so the technique needs review

Step 1: Read the mark as evidence: A drop on a sleeve is proof that liquid left the slide and travelled as far as your arm.
Step 2: Ask what else is at that distance: Your hands, your face and anything else at bench height, so the technique that produced the splash is what needs changing.

Why it's right: The mark is evidence that liquid left the slide and reached your arm, which means it could have reached skin or eyes at the same distance. The coat stopped this one and the technique still needs changing.

Why the others miss:

A: Storage temperature has nothing to do with a splash produced by how the reagent was applied.
B: Washing deals with the mark and ignores what the mark is telling you about where the liquid went.
D: The coat did work, and treating that as the end of the matter throws away the only warning you get before a splash reaches skin.

Aligned to Handling, Preparation, Storage and Disposal · reading level ~grade 9

Where you'd see this

A student reports a small stain splash so the class finds out that a step in the procedure is producing them.

Careers that use this

Laboratory Safety Coordinator: Collects small incident reports precisely because the pattern in them predicts the serious one before it happens.

Guided notes

Fill these in as you work through the lesson.

Big idea: A spill is contained by working inward from a boundary you draw around it, and by waiting. Every instinct pulls the other way: wipe quickly, start in the middle, and say nothing.

Key terms: write the meaning

Absorbent (what soaks the liquid up):
Outside in (the direction that shrinks a spill):
Contact time (the wait before lifting):
Spill kit (the prepared response materials):

The rule

Tell people, put on protection, the spill with absorbent material, apply disinfectant from the inward, wait the time, then lift and dispose.

Check yourself

Explain what happens to a spill wiped outward from the centre.
Say why broken glass in a spill is never picked up by hand.
Give a reason a small spill still gets reported.

Work one example

Broth goes across the bench. You say so out loud, check your gloves and eye protection, lay towels over it, then pour disinfectant starting at the outer edge and working toward the middle. You leave it while you deal with the rest of the station, then lift the towels into the waste route for that lab and treat the surface again.