Biopsy needle cleaning procedures

1. Prepare

1) Multi-enzyme lotion, syringe, high-pressure normal water, air gun, pin grinding machine or cotton swab.

2) Protective equipment: waterproof apron, protective clothing, eye mask.

2. Wash

Method 1: rinse, soak, rinse

1) Separate the needle core and the drainage tube.

2) Flush the blood in the needle cavity with high-pressure constant water and soak it in multi-enzyme solution for 10-20min.

3) Fill the needle cavity with enzyme solution with a syringe, soak it for 10-20min, and then flush the enzyme solution with high-pressure normal water.

4) After soaking, wash the enzyme solution with regular water, rinse the blood, fill the needle cavity with enzyme solution, and pass the liquid level when soaking the enzyme.

Method two: ultrasonic cleaning

1) Put the needle that takes out the needle core into the instrument basket.

2) Place the basket in the ultrasonic cleaning machine for 3-5min.

The needle should be placed ≥2cm below the liquid level of the ultrasonic machine, and the water temperature should be 40-45℃. The ultrasonic time was 3 to 5min.

Method three: disinfect, rinse

1) Boil and disinfect for 10min: time 10min after boiling, disinfect and boil, and note that the lumen is filled with boiling water.

(2) soak 500mg/l chlorine-containing disinfectant for 20-30min.

Fill the clockwise plug with disinfectant and replace the disinfectant regularly to prevent the needle from rusting due to too long immersion time. After disinfection, flush the disinfectant inside and outside the needle with regular water.

Evaluation of rinse quality: no residue of cleaning agent and disinfectant on puncture needle.

3. Polishing and needle tip inspection

1) grinding

Polish the pin part, check the tip part, and polish the tip with a grindstone if necessary; Wrap a little cotton on the grinding head, cover the needle plug, and start the grinding machine; Dry out the crusts and rust, or transfer with a cotton swab.

2) Needle tip inspection

Test the needle tip on the gauze hook, or check with a magnifying glass, and grind the needle tip with a grindstone if necessary. No trace, no rust, bright metal, no hook tip. Needles that do not meet the requirements must be discarded.

4. Rinse and fine wash

1) Rinse repeatedly with running water and high pressure normal water

Rinse needle and needle core repeatedly with running water, and rinse needle cavity with high-pressure water gun. Rinse the needle cavity for 30s each time; There is no disinfectant residue in the irrigated needle. The effluent from the needle cavity is straight.

2) Finally, rinse the needle cavity with distilled water or purified water

The needle and instruments were repeatedly rinsed in flowing distilled water or purified water, and then the needle cavity was rinsed with distilled water or purified water for 30 seconds. After fine washing, all parts of the needle were installed. After fine washing, the needle and needle core have no hard water residue, the water flow is straight when washing, the needle plug part has no scale, no rust, bright metal.

5. Dry and put into the packaging area

1) dry

Put the needle in a drying oven and dry it at 70-90℃ for 20-30min. After drying, it is put into the packaging area.

2) packing

Place the needle in a metal box with a cover and put it into a drying oven. Visually or with the aid of a magnifying glass, check that the needle has no hook, no dirt, no rust metal brightness, the needle plug is matched with the needle core, and the drainage tube is clean, no water droplets, no leakage, no adhesion.

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