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SYRINGE ERGONOMICS / FRUGAL INNOVATION

Getting a grip

I explored an extra grip point on a syringe barrel. The starting point was not the needle, but the hands trying to hold it steady.

Role: Contextual research, ergonomic exploration and rapid prototyping.
Collaboration: Research and feedback with 5 medical interns, 3 phlebotomists and 2 nurses.
Period: Dates not recorded.
Scope: Syringe grip, handprint studies, physical prototypes and an adjacent concept.

An unmodified syringe beside a physical prototype with transparent grip rings identified on the barrel and cap. — Physical grip exploration from the historical design study.

TL;DR / Overview

Problem: Practitioners’ hands could slip along the barrel while pulling the plunger, making the syringe harder to steady.
Role: I conducted contextual inquiry, compared bare and gloved handprints, developed grip concepts and prototyped them for early evaluation.
Surfaces: Syringe component studies, handprint comparisons, transparent EVA grip-ring prototypes and a low-fidelity bench simulation.
Reach: 5 medical interns, 3 phlebotomists and 2 nurses, with the same group revisited for prototype feedback.
Result: I narrowed the design to one barrel ring; handprint overlays suggested reduced slippage without quantifying distance or grip force.
Status: Early ergonomic prototype, not clinically validated or approved for use.

01 / CHANGING THE LENS

What about the person
holding the syringe?

Needles are often discussed from the patient’s side. I focused on practitioners using syringes repeatedly, and the small physical demands.

I mapped object handling alongside patient interaction, separating the syringe’s mechanical demands from the wider clinical task.

Then I looked at the object itself. The barrel, plunger, gasket, needle, connector and packaging each have a purpose, with different materials and manufacturing requirements.

The syringe was already a minimal, modular design. I wanted a small intervention for a specific difficulty, not novelty for its own sake.

The material research also made the constraints clear. Transparency, compatibility, sterility and legibility are not cosmetic details in a healthcare object.

Exploded syringe diagram identifying the needle cap, needle, hub, luer lock, gasket, barrel, plunger and blister packaging. — The component study helped locate the intervention within an existing object.

Original research board covering syringe materials, injection moulding, assembly, sterilisation and packaging. — Materials and manufacturing research, not a production specification.

02 / FINDING THE PROBLEM

The hand moved.
The task got harder.

Photographs documenting different hand positions around a syringe barrel and plunger. — Recording hand positions made the slipping area more concrete than a general request for “better grip”.

Shadowing, observation and contextual inquiry brought two difficulties into focus: finding a viable vein and maintaining grip while pulling the plunger.

5Medical interns

3Phlebotomists

2Nurses

Hands could slip towards the barrel’s connector as the plunger moved the opposite way, making the syringe harder to hold steady.

I reviewed existing vein-location work, including infrared approaches. With other solutions already being explored, I chose the more specific ergonomic issue of slippage.

To understand the grip rather than guess at it, I recorded the action and used a handprinting exercise to identify the contact and slip areas.

I looked at both bare and gloved hands. The prints gave me a visual reference to return to after making a prototype.

Two bare-hand prints with highlighted finger areas used in the grip study. — Bare-hand prints, with the relevant finger areas highlighted.

Two gloved-hand prints with highlighted contact and slippage areas. — The same exercise with gloves, which changed the contact pattern.

03 / A FRUGAL INTERVENTION

Borrow the grip.
Keep the object.

My brainstorming marker offered an analogy: pens add grip where fingers need it. Could a syringe barrel offer a similarly deliberate contact point?

Keep the markings visible.

The added material needed to be transparent so it would not hide the scale on the barrel.

Respect the viewing angle.

Placement had to avoid making the markings harder to read through parallax.

Work with different hands.

The extra grip needed to be reachable across hand sizes, within the object’s existing use constraints.

A hand holding several transparent rings of different sizes made during the physical grip exploration. — Trying different ring sizes and quantities before narrowing the barrel intervention.

A ring, not a redesign.

I chose ethylene-vinyl acetate, or EVA, for transparency and flexibility. After trying different ring sizes and quantities, I settled on one carefully positioned barrel ring.

The aim was a small, low-cost addition that suited the hand rather than asking the hand to compensate for the object.

The comparison photograph also shows extra cap grip; the main inquiry stayed with the barrel.

Medical-grade suitability, compatibility, sterility and comparative production cost were not established.

04 / RETURNING TO THE HAND

Compare the prints.
Then test the object.

I repeated the handprinting with the grip, then overlaid the new prints on the originals to compare the intervention.

Overlaid handprints before and after the grip intervention, with coloured finger regions used to compare slippage. — The original handprint comparison.

A smaller trace.

Smaller highlighted finger areas in the overlays suggested reduced slippage, giving me more to judge than appearance.

The red print is the earlier layer, without the intervention. The highlighted regions mark the areas being compared.

The comparison was visual, without measured slip distance or grip force.

Three photographs from a low-fidelity bench simulation using the syringe grip prototype. — Physical testing in a bench simulation, not a medical procedure.

From a print to a physical trial.

After a low-fidelity bench simulation, I returned to the original medical interns, phlebotomists and nurses for further testing.

The early trials were encouraging. Returning to the same group connected the proposed change to the people who had helped identify the problem.

Keep the conclusion proportionate.

The records describe the intervention as a successful frugal exploration, but do not give trial counts, a formal test protocol, numerical performance results or safety outcomes.

Detailed testing and analysis were still needed before manufacture or clinical use.

05 / AN ADJACENT QUESTION

What if the plunger
changed too?

The grip study opened a second, more speculative direction: changing the mechanism rather than adding to it.

Hand-drawn exploratory sketches of an adjustable vacuum-based syringe mechanism and a zip-lock arrangement. — An exploratory mechanism sketch, not a working product specification.

I sketched a concept that replaced the conventional plunger with an adjustable, vacuum-based arrangement using a zip-lock idea along the barrel.

The intent was to explore less movement during use and a different way of setting volume. Lower material use and steadier handling were proposed advantages, not measured outcomes.

This remained an adjacent concept. It was separate from the transparent grip-ring prototype.

The small problem was the useful one.

Narrowing the work was the hard part. Observation revealed an overlooked difficulty; a modest physical change gave me something specific to compare and test.