Improvised Tourniquet

Part of First Aid

When arterial bleeding cannot be stopped by direct pressure alone, a tourniquet is the last barrier between the patient and death by exsanguination. In a world without pre-made CAT tourniquets, you build one from whatever is at hand.

When to Use a Tourniquet

A tourniquet is not a first-line treatment. It is a deliberate decision to sacrifice blood flow to an entire limb to save a life. Use one only when:

• Bright red blood is spurting rhythmically (arterial bleed)
• Direct pressure with firm packing fails to control the bleed after 3-5 minutes
• A limb is partially or fully amputated
• Multiple casualties require you to control one bleed quickly and move to the next
• The wound location makes direct pressure impossible (e.g., deep groin or armpit junction)

Warning

Tourniquets are for limbs only. Never apply to the neck, chest, or abdomen. Never place directly on a joint (elbow, knee). Always position 5-8 cm above the wound, between the wound and the heart.

Materials That Work

The ideal improvised tourniquet material is flat, wide, and strong. Narrow materials cut into tissue and damage nerves.

Material	Width	Effectiveness	Notes
Leather belt	3-5 cm	Good	Stiff enough to hold tension; needs a windlass to tighten beyond what the buckle allows
Torn shirt/sheet strip	5-8 cm	Good	Fold fabric to at least 4 cm width; single-layer thin fabric is too weak
Cravat (triangular bandage folded)	5-10 cm	Excellent	Fold diagonally, then roll to desired width
Paracord / thin rope	0.5 cm	Poor alone	Wrapping it around a cloth pad improves it, but alone it cuts into flesh
Rubber tubing	1-2 cm	Moderate	Stretches well, but narrow width damages tissue; wrap over padding
Ratchet strap	2-5 cm	Excellent	Mechanical advantage built in; easy to tighten precisely
Necktie	3-4 cm	Moderate	Slippery fabric; tie knots carefully to prevent loosening

Minimum width rule: Never use anything narrower than 4 cm directly against skin. If your only option is cord or wire, wrap it over a folded cloth pad at least 8 cm wide to distribute pressure.

The Windlass Technique

A tourniquet without a windlass (twisting stick) rarely generates enough pressure to occlude arterial flow. Venous-only occlusion actually increases bleeding.

Step-by-Step

Step 1 — Place the band around the limb 5-8 cm above the wound. For upper arm tourniquets, position high and tight near the armpit. For legs, go as high on the thigh as possible if the wound is mid-thigh or above.

Step 2 — Tie a simple overhand knot (half-knot) so the band sits flat against the limb with no slack.

Step 3 — Place a rigid stick, rod, pen, screwdriver, or any sturdy bar (15-20 cm long) on top of the half-knot.

Step 4 — Tie a second overhand knot (completing a square knot) over the stick to lock it in place.

Step 5 — Twist the stick (windlass) in one direction. Each half-turn increases compression. Continue twisting until the bleeding stops. This will cause severe pain — that means it is working.

Step 6 — Secure the windlass so it cannot unwind. Options:

• Tuck the end of the stick under a loop of the tourniquet band
• Tie the stick to the limb with a separate strip of cloth
• Tape it in position if tape is available

Step 7 — Note the time. Write “TQ” and the time on the patient’s forehead with charcoal, pen, or blood if nothing else is available. A tourniquet should not remain in place longer than 2 hours without reassessment.

Belt Tourniquet Specifics

Belts are commonly available but present unique challenges:

1. The buckle alone is not enough. Belt buckles rarely tighten sufficiently to stop arterial flow. You still need a windlass.
2. Thread the belt through the buckle to create a loop around the limb, then apply the windlass technique over the belt.
3. Leather belts work best. Woven fabric belts stretch and lose tension. If using a fabric belt, double it over.
4. Position the buckle on the outer side of the limb where it will not dig into the inner tissue near major vessels.

Cloth Strip Tourniquet

When using torn clothing:

1. Cut or tear a strip at least 8 cm wide and 80-100 cm long. Longer strips give more wrapping material.
2. Fold the strip in half lengthwise if it is wider than 10 cm, to create a denser, stronger band.
3. Wrap twice around the limb before tying the half-knot to increase surface area and distribute pressure.
4. Avoid elastic or stretchy fabrics — they absorb tension instead of transmitting it to the tissue. Cotton, linen, denim, or canvas work best.

Common Mistakes

Mistake	Consequence	Correction
Too narrow (cord, wire, shoelace)	Cuts into tissue, damages nerves, fails to occlude artery	Use material at least 4 cm wide or pad underneath
No windlass	Cannot generate enough pressure; venous occlusion only, increasing blood loss	Always add a twisting stick
Placed over a joint	Ineffective compression due to bone geometry	Move 5 cm above or below the joint
Too loose	Blocks veins but not arteries, pooling blood in the limb	Tighten until bleeding stops and distal pulse disappears
Removed too early	Clot has not formed; bleeding resumes immediately	Leave in place; only medical personnel should remove
Placed over clothing	Fabric bunches, uneven pressure, tourniquet can slip	Apply directly to skin whenever possible

Checking Effectiveness

After applying the tourniquet:

1. Bleeding should stop completely. If it continues, tighten the windlass further.
2. Check for a distal pulse (wrist pulse for arm tourniquets, top-of-foot pulse for leg). If you can still feel a pulse, the tourniquet is not tight enough.
3. The limb below the tourniquet will become pale and cool. This is expected and indicates the tourniquet is working.
4. If one tourniquet is not enough (common on muscular thighs), apply a second tourniquet immediately above the first.

Warning

Do not loosen a tourniquet to “let blood flow back” periodically. This outdated advice causes re-bleeding and can release toxins from the ischemic limb into the bloodstream. Once applied, a tourniquet stays on until definitive wound repair is possible.

After the Tourniquet

• Keep the patient warm and treat for shock (legs elevated, insulated from ground)
• Prepare for wound repair: Wound Packing or Wound Closure once the situation is stabilized
• If you have the skills and supplies to repair the vessel or close the wound, the tourniquet can be cautiously loosened in a controlled environment while maintaining readiness to re-tighten
• Monitor the patient for signs of crush syndrome if the tourniquet has been on for extended periods: dark urine, muscle rigidity, irregular heartbeat

Key Takeaways

• A tourniquet is a life-saving last resort for uncontrollable limb bleeding — use it when direct pressure fails
• Minimum 4 cm wide material; always use a windlass (twisting stick) to achieve arterial occlusion
• Position 5-8 cm above the wound, never on a joint, never on the neck or torso
• Once applied, do not remove or loosen until definitive wound care is available
• Mark the time of application visibly on the patient