--- title: "Lean Manufacturing: Pull Production and Single-Piece Flow" description: "Pull production and single-piece flow explained for medical device lines: how they work, why output rises 20-30%, and how to check if your line is ready." image: https://www.pezosolutions.com/hubfs/operators_assembling_medical_d_99465_Nano_Banana_2.png --- [Skip to content](https://www.pezosolutions.com/the-cleanroom-ledger/lean-manufacturing-pull-production-single-piece-flow#main-content) [![Middle Blue Pezo Solution Logo with White Background PNG](https://www.pezosolutions.com/hs-fs/hubfs/accent1.png?width=1200&height=900&name=accent1.png)Homepage](https://www.pezosolutions.com/) - [Capabilities](https://www.pezosolutions.com/the-cleanroom-ledger/lean-manufacturing-pull-production-single-piece-flow#capabilities) - [R&D + Product Design](https://www.pezosolutions.com/rd-product-design) - [Manufacturing Process Design](https://www.pezosolutions.com/manufacturing-process-design) - [Precision Machining](https://www.pezosolutions.com/precision-machining) - [Automation & Machine Integration](https://www.pezosolutions.com/automation-machine-integration) - [Cleanroom Workstations](https://www.pezosolutions.com/elevt-workstations) - [GS 5T](https://www.pezosolutions.com/gs-5t-bench-top-catheter-overmolding-press) - [About](https://www.pezosolutions.com/about) - [Blog](https://www.pezosolutions.com/the-cleanroom-ledger) [Get In Touch](https://www.pezosolutions.com/get-in-touch) - [Capabilities](https://www.pezosolutions.com/the-cleanroom-ledger/lean-manufacturing-pull-production-single-piece-flow#capabilities) - [R&D + Product Design](https://www.pezosolutions.com/rd-product-design) - [Manufacturing Process Design](https://www.pezosolutions.com/manufacturing-process-design) - [Precision Machining](https://www.pezosolutions.com/precision-machining) - [Automation & Machine Integration](https://www.pezosolutions.com/automation-machine-integration) - [Cleanroom Workstations](https://www.pezosolutions.com/elevt-workstations) - [GS 5T](https://www.pezosolutions.com/gs-5t-bench-top-catheter-overmolding-press) - [About](https://www.pezosolutions.com/about) - [Blog](https://www.pezosolutions.com/the-cleanroom-ledger) [Get In Touch](https://www.pezosolutions.com/get-in-touch) ![Operators at modular workstations pass a single catheter assembly down a clean, uncluttered medical device production line.](https://www.pezosolutions.com/hs-fs/hubfs/operators_assembling_medical_d_99465_Nano_Banana_2.png?width=1000&height=558&name=operators_assembling_medical_d_99465_Nano_Banana_2.png) Single Piece Flow Lean Manufacturing Pull Production # Lean Manufacturing: Pull Production and Single-Piece Flow ![Mark Kiviahde](https://app.hubspot.com/settings/avatar/a1b2585cd0202205cce0c96dfe09784b) Mark Kiviahde November 5, 2026 The best-run lines don't build to a forecast and hope. They build what the next step, or the customer, actually needs, one part at a time. That is the core of lean manufacturing: pull production and single-piece flow. If you run a human-intensive line, especially in medical device manufacturing, you have probably felt the alternative. Shelves of finished goods nobody ordered. Piles of WIP between stations. A rush order that stalls because one component wasn't there. Most of that comes from scheduling to a forecast and moving parts in big batches. Here is how pull and single-piece flow work, why they raise output, and how to tell if your line is ready. **Where pull came from** Pull production traces back to Toyota. Taiichi Ohno, the engineer most credited with building the Toyota Production System, developed kanban in the late 1940s and early 1950s. He based it on the way American supermarkets restock shelves only as customers take items off them. Toyota built it as an alternative to the forecast-driven scheduling common in Western plants, often called push production. IBM engineer Joseph Orlicky later formalized that approach as material requirements planning (MRP) in the 1960s. *Sources: Taiichi Ohno, Toyota Production System: Beyond Large-Scale Production (Productivity Press, 1988); Joseph Orlicky, Material Requirements Planning (McGraw-Hill, 1975).* **What pull replaces** In a push system, a forecast or MRP schedule sets what gets built, and each step pushes its output downstream whether the next step is ready or not. The result is WIP between stations, finished goods waiting for orders, and buffers that hide slow processes and quality problems until they run out. In medical device, that excess stock also risks lot expiration and obsolescence after a design change. **Pull: build to actual demand** In a pull system, nothing gets made until the next step, or the customer, asks for it. When a downstream station uses a part, that consumption signals the upstream station to replace it. The signal is usually a kanban: a card, an empty bin, a marked square on the floor, or an electronic trigger. Most pull systems use small controlled buffers called supermarkets. Each holds a fixed amount of stock. When it drops to a set level, it triggers a refill. The buffer never grows past its limit, so WIP stays capped. Pull keeps inventory low, shortens lead time through the line, and makes problems visible. When there is no extra stock to hide behind, a slow station or a quality issue stops the flow and gets fixed. It also asks more of your process. Pull only works when: - Setups and changeovers are short enough to run small batches - Equipment is reliable, because a breakdown starves everything downstream - Incoming material quality is consistent - Demand is reasonably level, or you level it with a production schedule Drop pull onto a process that can't meet those conditions and you get stockouts instead of excess stock. That isn't an improvement. **Single-piece flow vs. batch processing** Pull decides when you build. Single-piece flow decides how parts move once you do. Together they are the heart of a lean line. In batch processing, a station finishes a full lot before any of it moves to the next step. In single-piece flow, also called one-piece flow, each part moves to the next step as soon as it is done. The difference shows up fast. Compared with running the same line in batches, single-piece flow typically: | **Measure** | **Typical improvement** | | --- | --- | | **Lead time through the line** | Cut by more than half | | **Time to the first finished part** | Dramatically faster | | **Parts exposed when a defect occurs** | One part instead of a full lot | | **Work-in-process on the floor** | A fraction of what batching holds | The bigger your current batches and the more steps in the line, the bigger the gains. Same stations, same cycle time, same labor. Parts get out the door faster, and quality problems get caught before they spread through a whole lot. Batching still has its place. Some processes are batch by nature: sterilization, curing, cleaning, plating, and oven processes that run a full load at once. Long changeovers also push you toward bigger batches, because each setup has to be spread across more parts. The practical goal is to make batches as small as your process allows. Shorten changeovers, balance station cycle times, and place batch-only steps where a small buffer can absorb them. In medical device, single-piece flow doesn't conflict with lot traceability. You can still assign lot numbers and keep device history records while parts move one at a time. **Why single-piece flow raises output** Manual lines that move from batch to single-piece pull flow commonly see 20–30% more output from the same people and stations. The flow itself doesn't add capacity. What it does is expose and remove the waste that batch processing hides. The gains come from four places: - **Less handling.** Counting, stacking, moving, and searching for parts disappear when parts pass directly from one station to the next. - **A visible bottleneck.** The slowest station shows up right away, so the work can be rebalanced instead of buffered. - **Cross-trained operators.** When people can run neighboring stations, they step in wherever the line is falling behind. The line runs at the pace of the team, not its slowest station. - **Less rework.** Defects get caught at one part instead of a full lot, so more of the line's time goes into good parts. There is a people side, too. When everyone can see the flow, the team naturally keeps pace with each other. The goal is a steady rhythm matched to customer demand, not a race. Pushing operators to go faster trades short-term output for fatigue and quality problems. **Where pull starts** Not every step has to run on pull from day one. Long-lead raw materials and components shared across many products may still be bought or built ahead. The goal is to pull everything downstream of that point, such as final assembly, configuration, test, and packaging, from a small supermarket of those common parts. A catheter line is a good example. Tubing and standard components with long supplier lead times feed a supermarket. Final assembly, reflow, testing, and packaging run in single-piece flow, triggered by real orders. The more of your line you can pull, the more of the gains you capture. Where you start usually depends on how long your customers will wait and which steps already have short, reliable changeovers. **Where automation fits** In a pull line, the bottleneck is usually changeover time and reliability, not raw speed. A machine that runs fast but takes an hour to switch products works against pull. Quick-change tooling, flexible fixtures, and mistake-proofed setups often do more for a pull line than a faster cycle time. Automation fits best when it can run one part at a time and keep pace with the operators around it. A machine designed for long batch runs, dropped into a single-piece flow cell, becomes the new bottleneck. Before you automate, design for flow first. **A quick self-check** If you're deciding how to run a line, start with these: 1. Where does WIP pile up today, and what is it hiding? 2. How long do your changeovers take, and could they be shorter? 3. How reliable is the equipment at each step? 4. Are your operators cross-trained on neighboring stations? 5. Which steps truly have to run in batches, like sterilization or curing? 6. How consistent is your incoming material quality? The answers show where pull and single-piece flow can start, and what has to change first to make them work. **Not sure where your line stands?** We'll walk your floor with you, map where material waits, and help you figure out where pull and single-piece flow can start. If automation or a better workstation would help, we'll tell you. If a process change gets you there faster, we'll tell you that too. Reach out to request a free line assessment. ## Share this post [mailto:https%3A%2F%2Fwww.pezosolutions.com%2Fthe-cleanroom-ledger%2Flean-manufacturing-pull-production-single-piece-flow](mailto:https%3A%2F%2Fwww.pezosolutions.com%2Fthe-cleanroom-ledger%2Flean-manufacturing-pull-production-single-piece-flow) ## Keep reading ### [![Engineer reviewing a modular precision workstation layout on a manufacturing floor.](https://www.pezosolutions.com/hs-fs/hubfs/Clean_modern_industrial_photog_Nano_Banana_2_58331.png?width=1000&height=558&name=Clean_modern_industrial_photog_Nano_Banana_2_58331.png) workstation Single Piece Flow Manufacturing Single-Piece Flow vs. Batch: When to Break the Rule](https://www.pezosolutions.com/the-cleanroom-ledger/single-piece-flow-vs-batch-process-lean-manufacturing) ### [![](https://www.pezosolutions.com/hs-fs/hubfs/Documentary-style_photograph_i_Nano_Banana_2_14508.png?width=2752&height=1536&name=Documentary-style_photograph_i_Nano_Banana_2_14508.png) Business Development A Top Account Doesn't Stay a Top Account by Accident](https://www.pezosolutions.com/the-cleanroom-ledger/a-top-account-doesnt-stay-a-top-account-by-accident) [![white](https://www.pezosolutions.com/hubfs/white.svg "white")](https://www.pezosolutions.com/) - [Capabilities](https://www.pezosolutions.com/the-cleanroom-ledger/lean-manufacturing-pull-production-single-piece-flow#capabilities) - [Cleanroom Workstations](https://www.pezosolutions.com/elevt-workstations) - [GS 5T](https://www.pezosolutions.com/gs-5t-bench-top-catheter-overmolding-press) - [About](https://www.pezosolutions.com/about) - [Blog](https://www.pezosolutions.com/the-cleanroom-ledger) --- Pezo Solutions, 108 Dundas Rd Building F2, Monticello, Minnesota 55362. 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