What Is a Femoral Nerve Block?

Femoral nerve block is a surgery that is suitable for the treatment of sensory disturbances or abnormalities.

Femoral nerve block

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Femoral nerve block is a surgery that is suitable for the treatment of sensory disturbances or abnormalities.

Chinese name

Femoral nerve block

Foreign name

femoral never block

Abbreviation

FNB

Femoral nerve block

Femoral nerve block is suitable for:

1. Perceptual disturbance or abnormality of the skin of the anterior thigh and inner calf.

2. Pain, cramps, atrophy, paralysis, etc. in the pubis, quadriceps, sartorius and adductor muscles.

3. Moderate and severe pain in the knee joint.

4. If the sciatic nerve is blocked at the same time, it can be used for anesthesia and postoperative analgesia in knee and calf surgery.

5. Pediatric femoral shaft fracture reduction.

6. Pain in children after surgery.

1. Infectious diseases of skin and soft tissue at the injection site.

2. Inject the ipsilateral femoral hernia or rat diaphragmatic hernia.

3. Those who have bleeding tendency.

1. The patient prepares the patient to take the supine position, the lower limbs are slightly separated, and the affected foot rotates outward.

2. The puncture point is located about 1 ~ 2cm below the midpoint of the inguinal ligament. First, the femoral artery pulsation is touched, and a mark is made at the outer 2cm of the needle as the needle insertion point.

3. Routine skin disinfection.

4. Prepare a 4 to 5 cm 7-gauge sterile puncture needle.

1. The left hand of the surgeon presses on the femoral artery pulsation, inserts the needle at the mark made on the outside, slowly inserts the needle after vertical skin penetration, and passes through the fat layer and fascia layer to induce the distribution along the femoral nerve. Diffuse sensation (because the puncture needle passes through the broad fascia and the lumbo-fascial fascia twice and feels empty), you can stop the needle insertion and fix the needle at this time.

2. The nerve stimulation positioning instrument can be used to pulsate the quadriceps with the pulse of the stimulator. Generally, the amount of stimulation is preferably 0.3 to 0.5mV. Below 0.2mV there is a danger of the needle tip penetrating into the neural trunk. At this time, the injection of drugs can Causes femoral nerve damage.

3. After confirming that the puncture needle is in place, rotate the needle (360 °), and then inject the medicine after sucking back no blood.

4. Drugs and dosage: 0.25% 0.5% lidocaine + vitamin B12500 1000g 5 10ml, if necessary without contraindications, you can add dexamethasone 5mg twice a week, or add triamcinolone 20 40mg every 1 to 2 weeks.

1. Pay attention to the angle of puncture when puncturing the needle to avoid stabbing the femoral artery and vein.

2. Attention should be paid to the slow injection. After injection, press the injection for a while to prevent the liquid from spreading to the lower extremities.

3. Simultaneously observe the vital signs of the patient.

4. The puncture site needs to be protected with a sterile dressing, and avoid contact with water pollution within 24 hours to prevent local infection.

5. Attention should be paid to judging the effects. The criteria are: the symptoms are relieved or disappeared; the femoral area, the lower knee and the inner side of the calf feel dull; the quadriceps muscle strength is weakened or disappeared, the calf straightening is limited; Weaken.

6. Young children need to be operated under deep sedation or basic anesthesia.

7. Local injection of local anesthetic by mistake can cause systemic toxic reactions.