Incorporation of measurement markings on laparoscopic instruments to facilitate intraoperative flap creation and mesh placement in transabdominal preperitoneal hernia repair

Accurate intraoperative measurement is an underappreciated yet essential component of laparoscopic surgery. Procedures such as transabdominal preperitoneal (TAPP) hernia repair for inguinal and ventral hernia demand spatial judgement for flap dissection, mesh placement and ensuring adequate overlap. Despite the growing sophistication of minimally invasive surgical tools, a simple and standardised method for intra-abdominal measurement remains elusive. Commonly used strategies by laparoscopic surgeons include pre-measuring meshes extracorporeally before insertion, using suture threads or gauze as makeshift rulers or introducing a scale through a trocar. Each of these techniques has limitations: they interrupt operative flow, prolong operative time, risk contamination and lack standardisation across cases and surgeons. THE PROPOSED CONCEPT We propose a straightforward modification to commonly used laparoscopic instruments – incorporating engraved or laser-etched measurement markings along their shafts. The concept involves creating visible markings at defined intervals (for instance, every 1 cm up to 10 cm or specific markings at 5 cm and 10 cm from the tip). These markings could be incorporated onto instruments frequently used for dissection or manipulation, such as the Croce grasper or Maryland. Such markings could be achieved through laser engraving or colour-coded bands made from biocompatible, autoclavable material. The markings should contrast clearly under standard laparoscopic illumination without causing glare or optical distortion. CURRENT PRACTICE AND INSTITUTIONAL EXPERIENCE At our institute, which routinely uses Karl Storz instruments, surgeons often rely on known dimensions of instruments to make intraoperative spatial judgements. For instance, the open jaws of the Croce Ace grasper measure approximately 3 cm, whereas the open Maryland measures about 2.5 cm. The distance from the tip of the Croce Ace to the ‘Z’ marking in the engraved Karl Storz logo on the shaft is 5 cm. These known distances are sometimes used intuitively for intra-abdominal estimation of dissection length or mesh overlap. While this practice demonstrates surgical ingenuity, it remains imprecise and dependent on individual familiarity with specific instruments. A standardised, engraved measurement scale directly incorporated onto the shaft would formalise this intuitive process, making it reproducible and universally applicable regardless of instrument make or model. ADVANTAGES AND POTENTIAL IMPACT The incorporation of calibrated markings on existing laparoscopic instruments could provide several advantages. First, it enables real-time intraoperative measurement without the need for an additional tool. This improves efficiency by reducing instrument exchanges, which are known to add to operative time in minimally invasive procedures cumulatively. Second, it enhances accuracy and reproducibility – critical aspects when creating peritoneal flaps or ensuring adequate mesh overlap (commonly recommended to be at least 4 cm beyond the defect margins).[1] Third, it promotes standardisation across surgeons and institutions, improving documentation and comparability of operative techniques. Moreover, the concept has no learning curve and integrates seamlessly into the surgeon’s workflow. The modification is inexpensive, does not alter the ergonomics of the instrument and can be retrofitted onto existing laparoscopic sets by manufacturers or through local customisation. A potential limitation of this concept is that most laparoscopic instruments are straight, whereas the abdominal wall and peritoneal surface are curved. As a result, direct measurements taken along the shaft of the instrument may slightly underestimate true surface distances, particularly when measuring along the abdominal contour. Nonetheless, this minor discrepancy is unlikely to affect clinical decisions or compromise the intended surgical precision. CLINICAL RELEVANCE In TAPP repair for both inguinal and ventral hernia, precise peritoneal flap dissection extending adequately beyond the hernial defect is essential for adequate mesh placement, and coverage of the myopectineal orifice is critical to minimise recurrence.[2] The ability to directly measure intra-abdominal distances using the same dissection instrument would improve intraoperative confidence and reduce reliance on subjective estimation. This concept also has broader applications across various laparoscopic procedures requiring spatial judgement – such as fundoplication, Heller’s myotomy or colectomy – where measurement of lengths or distances between anatomical landmarks can guide safe and consistent technique. FUTURE DIRECTIONS The idea warrants validation through prospective studies comparing operative efficiency, accuracy and outcomes between standard instruments and calibrated ones. Collaboration between surgeons and industry partners could refine the design for optimal visibility, durability and sterilisation compatibility. In an era where innovation often focuses on robotics and advanced imaging, this proposal reminds us that simple, thoughtful modifications to existing tools can yield meaningful benefits in everyday surgical practice.[3] Financial support and sponsorship Nil. Conflicts of interest There are no conflicts of interest.