Neonatal Comfort Seat Allowing Safe Lumbar Puncture and Minimizing Failure: a Randomized Controlled Trial

Lay Description: Newborn babies who are unwell sometimes need to undergo a medical procedure known as a 'lumbar puncture' (also called 'spinal tap'). During this procedure, a needle is inserted at the base of the spine to extract fluid from the spinal column. This is most often done to determine if the baby has meningitis. The medical device presented here places the child's comfort and safety at the center of the spinal tap/ lumbar puncture experience and in doing increases the success of this otherwise stressful and technically challenging procedure. This is achieved by placing the child in a stable, firm, but comfortable position nearly eliminating patient motion which otherwise interferes with procedure success, and reduces the variability associated with a human assistant/holder

In the course of routine medical care of infants and young children, it may be necessary to conduct a procedure known as a 'lumbar puncture' or 'spinal tap' which involves insertion of a needle into the base of the spinal column in order to extract fluid for diagnostic purposes. The goal is to obtain a fluid sample with minimal trauma on the first attempt. The target space into which the operator is aiming to access this fluid is approx. 3 mm in diameter. First attempt failure rates range from 30-50%. A second try immediately following a first try, even if successful, leads to more trauma to the patient and often a sub-optimal sample (the "bloody tap") due to surrounding tissue/vascular disruption.

Many factors may contribute to first attempt success in this procedure:

• The clinical condition of the baby including hydration
• How well pain is controlled (assisting in the reduction of movement)
• The experience and confidence of the operator conducting the procedure and technique
• The experience of the assistant positioning the baby. This factor is generally accepted among clinicians as the most important factor contributing to procedure outcome and yet it is highly variable.

The lumbar puncture procedure may be conducted with the baby placed in a side-lying position. The side-lying position is most common, historically, as the patient seems to be more stable. However the alignment of the spine is often disrupted.

The upright sitting position may also be used. There is recent compelling evidence that this position is superior to the side lying position (NeoCLEAR Study 2023)

The sitting position is associated with better outcomes but is often avoided as the holding technique is more complex

The problem which the current innovation seeks to resolve is the high degree of variability in quality, consistency, and reproducibility of a positioning/immobilization of the neonatal patient during the lumbar puncture procedure.

Inclusion criteria

• Late preterm (34 + weeks) Gestational Age to Term (42+ weeks GA)
• Weight of 2.5 - 5 kg

Exclusion criteria

• Any contraindication to having a lumbar punture procedure