Simulation is the obvious answer, but commercial cricothyroidotomy simulators cost hundreds of dollars, putting them out of reach for many of the settings where trauma training is needed most. Traumatic injury requiring surgical intervention accounted for 19.1 percent of the global burden of disease in 2021, with low- and middle-income countries disproportionately affected. Existing low-cost alternatives have their own drawbacks: 3D-printed models depend on printing technology that is not reliably available in resource-poor environments, pig tracheas require special handling and storage and can be used only once, and other homemade designs rely on epoxy or silicone resin that may not be easy to source. A team led by Lukas Shum-Tim, with collaborators spanning medical students, surgical residents, surgeons, nurses and biomedical engineers from five institutions, set out to break that trade-off between cost and accessibility.

Their solution is disarmingly simple. The simulator is built from an egg carton, a 500 mL water bottle, a nitrile glove and homemade slime made from laundry detergent, glue, corn starch and sodium bicarbonate. To the authors’ knowledge, no other simulator in the literature has used slime as a cheap, infinitely reusable material that mimics soft tissue. The total materials cost is about 0.53 USD per unit, dropping further if materials are recycled, and assembly from scratch takes less than five minutes, with a per-use cost of roughly 0.05 USD, lower than most previously described low-cost simulators. The full design and manufacturing process was described in a separate publication, and the team deliberately chose materials that are accessible essentially anywhere in the world.

A cheap trainer is only useful if it can actually measure skill, so the team set out to generate validity evidence for using the simulator in formative assessment. They anchored the study in Messick’s unified validity framework, the approach recommended by the American Educational Research Association and the American Psychological Association, gathering evidence across five sources: content, response process, internal structure, relations to other variables, and consequences. The study was conducted at McMaster University between December 2024 and April 2025, with the British Columbia Children and Women’s Research Ethics Board deeming it quality improvement and waiving full ethics review.

Twenty-six participants were recruited through convenience sampling: 19 novices, mostly surgical residents, and seven experts, defined as physicians with at least five years of postgraduate clinical experience in trauma or head and neck surgery. None had seen the simulator before. Each participant completed a pre-test survey, performed a cricothyroidotomy on the model while a camera recorded their hand movements, and then filled out a 43-item post-test questionnaire covering anatomy, realism, instrument handling and confidence. Guidance was given only after the performance, never during it, so that the recorded attempts reflected unaided skill.

Two trauma surgeons independently scored the anonymized videos using two standardized instruments. The procedure-specific checklist contained nine items corresponding to critical steps of a Rapid Four-Step Cricothyroidotomy, adapted from a validated bougie-assisted checklist so that the assessment would work even in settings where bougies are unavailable; each step earned five points if achieved, three if in progress, and one if not observed. The error checklist contained seven items drawn from a multicenter expert collaboration on mistakes to avoid, with one point awarded for each error avoided. The raw score, ranging from nine to 52, was then divided by procedure time in seconds, a deliberate design choice reflecting the clinical reality that airway compromise must be resolved quickly and that errors or delays can cause irreversible harm.

The results showed the simulator does what a training tool should: it separates the skilled from the unskilled. Experts completed significantly more procedural steps than novices (Mann-Whitney U z = -2.52, p = 0.012), committed fewer errors (z = -3.07, p = 0.002), achieved better raw scores (z = -2.69, p = 0.007) and better final timed scores (z = -3.21, p = 0.001), and finished faster (z = -2.86, p = 0.004). In other words, experts were more accurate, made fewer mistakes and worked quicker, exactly the pattern expected if the simulator captures the essential elements of the real procedure. Internal consistency was excellent across the board, with Cronbach’s alpha of 0.86 for the procedure checklist, 0.85 for the error checklist, 0.84 for novice questionnaire responses and 0.97 for expert responses, all more than adequate for low-stakes formative assessment.

The study was candid about its weaknesses. Interrater reliability was only moderate for the procedure checklist, with an intraclass correlation of 0.54, and poor for the error checklist at 0.36, likely because composite scores are harder to agree on than binary ones and because the raters received no formal rating standardization. The authors calculated, using the Spearman-Brown formula, that about four raters would be needed to reach a targeted reliability of 0.5 on the error checklist, a burden they argued is hard to justify for a formative tool. Defining expertise also proved tricky, since multiple specialties perform the procedure with slightly different techniques, and one checklist item, a vertical skin incision, cost experts points even though a horizontal incision would be clinically valid in some contexts. Notably, no expert achieved a perfect score, which the authors read as a sign the simulator is better suited to assessing and teaching novices than to certifying experts.

Confidence data added a cautionary nuance. Novice pre-test confidence, averaging 1.68 on a five-point scale, rose to 3.80 after the exercise, while expert confidence dipped slightly from 3.78 to 3.00. One expert warned that a low-fidelity model risks underrepresenting the skillset required and could foster false confidence, a reminder that training on a single unidimensional model may not build the adaptive expertise needed to handle varied patient presentations. The authors counter that their conclusions align with studies using high-fidelity models, consistent with a growing literature showing that low-fidelity simulation training for procedural skills is not inferior to high-fidelity training, and that simulation of any kind beats no intervention at all.

The bigger picture is one of democratized surgical education. By slashing the cost of a cricothyroidotomy trainer to half a dollar and designing it from materials found in any household, the team has removed the procurement barrier that keeps simulation out of hospitals, training programs and medical schools in low-resource settings, where trauma burdens are highest and learning alternatives are scarcest. The findings provide preliminary validity evidence that checklist-based assessment of simulated cricothyroidotomy performance works on this humble device, and the authors are explicit that further research is needed to determine its educational effectiveness. But the concept has an appeal that goes beyond one procedure: if a slime-and-egg-carton model can reliably distinguish expert from novice performance on a life-saving emergency airway maneuver, the same design philosophy, frugal, reproducible and globally accessible, could be applied to a whole family of high-acuity, low-occurrence skills that clinicians everywhere struggle to practice before the moment they matter most.

Subject of Research: Validation of a low-cost, low-fidelity cricothyroidotomy training simulator for surgical education

Article Title: Evaluation and performance assessment on a low-cost, low-fidelity cricothyroidotomy simulator

Article References: Shum-Tim, L., Desaigoudar, V., Mashat, A., Hsiao, H., Malik, P. R. A., Malone, K. R., Abdalla, M. H., Rajagopalan, S., Mourad, N., Bos, C., Joos, E., & Joharifard, S. (2026). Evaluation and performance assessment on a low-cost, low-fidelity cricothyroidotomy simulator. Global Surgical Education – Journal of the Association for Surgical Education, 5(1), Article 138. https://doi.org/10.1007/s44186-026-00545-z

Image Credits: AI Generated

DOI: 10.1007/s44186-026-00545-z

Keywords: cricothyroidotomy, surgical simulation, medical education, global surgery, validity evidence, low-cost simulator, emergency airway, trauma training, Messick framework, checklist assessment, low-resource settings, surgical skills

The research, led by Jessica Yavner and colleagues at the State University of New York Downstate Health Sciences University in Brooklyn, set out to answer a question that has lingered in surgical education circles: how do you implement a cost-effective, medical-student-driven simulation program that actually works? Simulation is widely used to build clinical skills, but the literature is surprisingly thin on practical guidance for programs that must run on shoestring budgets, particularly in institutions and regions with limited resources. The Brooklyn team designed a surgical skills simulation clerkship course with an annual budget of less than $1,000, a figure that would barely cover the cost of a single high-fidelity mannequin session at many training centers.

The curriculum focused on four pillars of early surgical competence: opening and closing procedures, relevant anatomy, and post-operative care. Rather than relying on expensive technology, the organizers embraced a near-peer teaching model in which medical students themselves delivered the instruction. This approach, well documented in the education literature, benefits both sides of the equation. Senior students consolidate their own knowledge by teaching, while junior students often find it easier to ask basic questions of a peer than of an attending surgeon. It also happens to be one of the most economical ways to scale skills training, since it requires no additional faculty time for every session.

Over one year, 230 students participated in the program. The researchers administered questionnaires before each session, immediately afterward, and again at three- and six-month follow-ups, measuring confidence and perceived benefit on Likert scales. Of the participants, 117 students completed paired pre- and post-session surveys, a response rate of 51.3 percent. The statistical analysis was appropriately rigorous for the design: Wilcoxon signed rank tests compared pre- and post-session confidence scores, Dunnett’s test assessed whether the gains were retained over time, and Spearman’s correlation examined how surgical interest and operating room exposure related to perceived benefit.

The results were striking in their breadth. Students reported significant improvements in median confidence from before to after the sessions across essentially every domain the curriculum touched: preparation for the operating room learning environment, suturing, knot-tying, laparoscopic anatomy, sterile and scrub technique, post-operative care, knowledge of laparoscopy, identification and handling of surgical instruments, respectful and safe behavior in the operating room, and operating room protocols. All of these improvements reached statistical significance at the p < 0.05 level. In other words, a few hours of low-cost, peer-delivered practice measurably changed how prepared students felt for nearly every dimension of the surgical environment that intimidates newcomers.

Just as important was what the follow-up surveys showed. Confidence gains were not confined to the immediate afterglow of a positive teaching session; the study assessed retention at three and six months, and the curriculum was found to effectively sustain student confidence over that period. Durability is the perennial weakness of short educational interventions, and many simulation programs struggle to demonstrate that their effects outlast the novelty of the experience. The Brooklyn team’s finding that the benefits persisted suggests the curriculum taught durable mental models, not just momentary reassurance.

The perceived value of the program was equally emphatic. 92.3 percent of students found the curriculum beneficial, and the degree of perceived benefit was positively correlated with surgical interest, with a Spearman correlation coefficient of 0.31 that was statistically significant. That modest but real association hints at a virtuous cycle that surgical educators care deeply about: students who arrive with an interest in surgery get the most out of hands-on simulation, and positive early experiences may, in turn, reinforce that interest at a formative stage of training. With surgical specialties facing persistent recruitment and pipeline challenges, interventions that strengthen the earliest encounters between students and the operating room carry implications well beyond a single clerkship.

The study’s emphasis on cost is what elevates it from a competent local program to a potentially exportable model. In a systematic review cited by the authors, researchers noted that cost is the missing outcome in simulation-based medical education research; most studies report learning gains without ever accounting for what those gains required in dollars, equipment, or faculty hours. High-fidelity simulators, virtual reality platforms, and cadaver laboratories all deliver value, but their price tags put them out of reach for many institutions, particularly in low- and middle-income countries and in under-resourced teaching hospitals. A curriculum that achieves significant, sustained confidence gains on an annual budget under $1,000 removes the most common objection to adopting simulation in exactly the settings where students may have the least prior exposure to operating rooms.

The institutional context adds weight to the findings. SUNY Downstate serves a diverse population in Brooklyn, and its medical students span a wide range of prior exposure to surgical environments. The study received ethical approval as an exempt protocol from the institutional review board, with a waiver of written informed consent, and the curriculum was funded by the institution’s Surgery Clerkship rather than by external grants, underscoring its lean operating model. The authors dedicated the work to Erfan Faridmoayer, whose contributions to the project they describe as an inspiring legacy, a reminder that behind every curriculum study is a community of educators and trainees who built it session by session.

For educators weighing whether a student-led simulation program is worth the logistical effort, the study offers a clear signal. It demonstrates that near-peer instruction, deliberately scoped content, and repeated measurement can produce statistically significant and durable gains in the specific competencies that make students feel ready for the operating room, all while minimizing the implementation barriers that typically sink such efforts. The next step for the field will be testing whether confidence gains translate into objectively measured technical performance and, ultimately, into safer and more productive student participation in real operations. But as a proof of concept, this Brooklyn experiment makes a compelling case that the most valuable surgical training does not always require the most expensive equipment; sometimes it requires little more than students willing to teach each other how to hold a needle driver.

Subject of Research: Medical student-led surgical simulation training and its effect on operating room confidence in a limited-resource setting

Article Title: Impact of medical student-led surgical simulation curriculum on student confidence in the operating room in a limited resource setting

Article References: Impact of medical student-led surgical simulation curriculum on student confidence in the operating room in a limited resource setting. (n.d.). https://doi.org/10.1007/s44186-026-00539-x

Image Credits: AI Generated

DOI: 10.1007/s44186-026-00539-x

Keywords: surgical simulation, medical education, near-peer teaching, operating room confidence, low-resource setting, surgical skills, clerkship curriculum, simulation-based education, medical students, surgical education, Impact, medical