Lumbar puncture locator device

A method of accurately locating a soft tissue lumbar puncture location between vertebrae comprising the steps of:

• providing a fixture which holds both a lumbar fluid extraction needle and an ultrasonic probe;
• providing a tissue density meter which receives ultrasound signals from said ultrasonic probe, and in response outputs a digital code, which corresponds to at least one of bone or tissue;
• providing an interface box housing:
• an input for receiving said digital code, and
• combinatorial logic for converting said digital code to one or more auditory and/or visual indicators, wherein each unique indicator is associated with a unique digital code;
• and
• moving said fixture over a patient's vertebrae-adjacent skin until said device outputs a visual or auditory signal indicating a soft tissue lumbar location has been established, allowing a doctor, nurse or technician to extract lumbar fluid at said soft tissue lumbar location, said lumber fluid is used to test for abnormalities and diseases.