Blackstone Suction HS-400III

On a surgical suction unit, vacuum and flow answer different questions and both matter. Vacuum is the pressure pulling at the end of the tube, and too much of it damages tissue while too little fails to lift anything viscous. Flow is how much volume moves per minute once something has been lifted, and it is what empties a surgical field rather than trickling at it. Eighty litres a minute alongside 680 mmHg describes a machine built for volume, and volume is what theatre suction exists to shift.

The minimum setting is the figure a department should weigh most carefully. One hundred and fifty millimetres of mercury is a reasonable adult airway figure and an unreasonable paediatric one, and a unit that cannot go below it should not be the machine a children's ward reaches for when a child needs their airway cleared. None of that counts as a fault in a theatre unit. It simply decides which areas the machine should be placed in, and which it should not.

Overflow is the practical risk to raise with whoever maintains the equipment. Four jars holding twelve litres between them reduce how often anyone changes a vessel, which in turn reduces how often anyone checks the levels. A unit without a float or shut-off relies entirely on somebody noticing, and a busy theatre is exactly where nobody does. Medigear.uk establishes the overflow arrangement, exhaust filtration, duty cycle, and jar reprocessing limits before this unit reaches a theatre.

Vacuum Published in Both Units

Giving 0.09 MPa alongside 680 mmHg saves a buyer from converting, and most sheets in this catalogue give one figure or none at all.

Flow Beyond Eighty Litres

High displacement empties a surgical field quickly, which is what separates theatre suction from a machine that merely pulls hard.

Twelve Litres Across Four Jars

A long case runs without stopping to change a vessel, and splitting the volume between four means no single jar is unmanageable to handle.

Vacuum Adjustable, Not Fixed

You can turn the pressure down for lighter work, within a range that starts at roughly 150 mmHg rather than lower.

Noise Actually Rated

Sixty decibels or below is published, which few sheets bother with, and suction noise is a real irritation in a theatre lasting hours.

Weight and Dimensions Given

Twenty-two kilograms net at 330 by 390 by 890 mm lets a department judge whether it fits and who can move it.

Polycarbonate Rather Than Glass

Plastic jars survive being knocked in a way glass does not, which matters on a unit wheeled between theatres.

Mobile on Castors

The unit moves to where it is needed rather than a case being arranged around where the suction happens to stand.

Vacuum Beyond 0.09 MPa

Stated by Blackstone as 680 mmHg.

Adjustable 0.02 to 0.09 MPa

Roughly 150 to 680 mmHg.

Flow Beyond 80 L/min

High displacement for surgical volumes.

Four Jars, Twelve Litres

Two of four litres and two of two.

Polycarbonate Jars

With no autoclave limit published.

Noise 60 dB(A) or Less

Rated on the specification sheet.

Weight of 22 kg Net

Twenty-seven kilograms gross packed.

Supply 220 V, 50 Hz

Drawing 280 VA in operation.

Mobile Base

On castors, with braking undescribed.

No Overflow Protection Listed

Absent from the specification entirely.

Two numbers place this surgical suction unit, and one omission qualifies it. Vacuum beyond 680 mmHg with flow past 80 litres a minute describes theatre suction, and twelve litres across four jars confirms it: this is built for clearing blood and irrigation fluid through a long case. The gentlest setting, though, converts to about 150 mmHg, which is already the top of the range used for adult airway suction and above what a child should receive, so this belongs in a theatre rather than on a paediatric ward. The omission is overflow protection, which appears nowhere on the sheet. A jar filling while suction runs sends fluid into the pump, and a 12-litre capacity means longer between checks. Exhaust filtration goes unmentioned too. Medigear.uk establishes both, including the jar reprocessing limits, before quoting this surgical suction unit.