1993: The First Housing

The origin pointT1 · from the patentUS5535097A

Filed November 23, 1993 — the earliest patent in the corpus, with David A. Ruben first on the inventor list. The subject could not be more foundational: the pacemaker's body itself — the hermetic housing, and the connector module that joins it to the lead running into the heart.

The problemT1 · from the patentUS5535097A

The background section is a compact history of pacemaker construction: discrete components potted in epoxy; then sealed metal cans. By the early '90s the standard was a "clam shell" — two halves butt-welded around the electronics, requiring weld-ring protection and separate plastic cups to position components. Many parts, many steps, many chances for error.

The principleT1 · from the patentUS5535097A

Redesign the enclosure so the parts locate themselves. Claim 1: a first enclosure portion with a planar lower interior surface and a stepped second interior surface; battery and circuit mounted adhesively; connections made by wire bonding (chip-industry technique, not hand-soldered wires); the feedthrough passing through the stepped surface; a second portion completing the hermetic seal. (The molded resilient shroud forming the connector module is the abstract's summary — in the claims it is claim 3's connector module "mounted to said circumferential edge surface.") Claimed result: "fewer components and fewer manufacturing steps," lower cost, and a "smooth, rounded contour" kinder to the tissue pocket it lives in.

Plain-English registerT3 · interpretationconfidence: high

Instead of building a box and then engineering trays to hold everything, shape the box's interior so each part has one obvious seat — then close the lid once. Fewer pieces, fewer welds, fewer ways to fail.

Measured influenceT1 · from the patentUS5535097A

Google Patents lists 100 citing patents — among the most-cited work in the corpus (only the accelerometer line's members rank higher) — meaning a hundred later inventions found this design foundational enough to cite as prior art.

Why it matters to the storyT3 · interpretationconfidence: high

Every theme of the next three decades is already present in this one 1993 filing: hermeticity as the prime constraint, manufacturability as a design input, borrowing microelectronics techniques into medical devices, and volume efficiency as mercy on the patient. The corpus doesn't wander — it deepens. This is the seed.

Set-piece note (for Presentation)T3 · interpretation

The natural opener for the whole site: the 1993 patent's line drawing of the housing assembling itself piece by piece — battery seating into its step, bond-wires arcing, lid closing — then the finished can slowly morphs through the decades into the miniaturized modern forms. Career in one shot.