The Ball Inside the Disinfectant Cap Bathing an IV Fitting in Alcohol While Plugging Its Opening Shut

This application covers a small screw on cap that holds a dose of disinfectant and sits over the open end of an intravenous line fitting between uses. What is actually claimed is not the disinfecting idea, which is decades old, but a deformable ball trapped inside the cap. The ball seats in a groove to hold the liquid in during storage, and when the fitting is screwed in the ball is pushed back, releasing disinfectant over the outside of the fitting while simultaneously blocking the hole down its middle so none of that disinfectant gets into the patient’s bloodstream. It was filed by Becton, Dickinson and Company and names six inventors. The application is a divisional of Australian application 2024202224.

The Problem

Anyone who has been in hospital with a drip has a luer fitting somewhere in the tubing. It is the standardised tapered plastic connector, usually with a collar of screw thread around it, that lets any syringe join to any line. The male half is a tapered spigot with an open hole, the lumen, running down its centre. The female half is the socket it goes into. That standard is why medical fluid handling works at all, and it is also the weak point, because every time a line is broken and rejoined there is an opening exposed to the room.

Patients on longer term therapy have a central venous catheter or a peripheral line that stays in place for days. Bacteria introduced at any join can travel down the line and straight into the bloodstream, causing what the specification calls a catheter related bloodstream infection, or CRBSI. The document describes these as “costly and potentially lethal,” which is an accurate if unhelpfully brief summary. The standard defence, set out in the Infusion Nurses Society standards of practice quoted in the background, is that a needleless connector should be “consistently and thoroughly disinfected using alcohol, tincture of iodine or chlorhexidine gluconate/alcohol combination prior to each access.” In practice a nurse wipes it with a 70 per cent isopropyl alcohol pad, an action known as scrubbing the hub.

The specification is blunt about why that is not enough. Compliance with scrubbing the hub “is typically very low,” and clinician interviews show wide variation in scrub time, drying time and the number of scrubs performed. Passive disinfection caps, which sit on the connector and do the work without anyone having to remember, have been written into both the Society for Healthcare Epidemiology of America guidelines and the Infusion Nurses standards for exactly this reason.

But the caps that exist are mostly for the female side. Paragraph 4 identifies the gap this filing targets. When an infusion is paused and the line is disconnected, the male connector on the giving set or syringe is left dangling with its lumen open. Nurses improvise, looping it back onto a Y site connector or wrapping it in an alcohol wipe, and the specification calls that “very weak” protection that “does not protect the luer from touch contamination properly.”

Then comes the problem that shapes the claim. Male fittings have an open lumen. Fill a cap with disinfectant and screw it onto one, and the disinfectant runs straight into the fluid path. Paragraph 6 spells out why that is unacceptable: “Disinfectants typically have a threshold limit for systemic exposure for infusion into blood stream due to biotoxicity of the disinfectants at high dosage.” What is needed, the specification says, is “a mechanism to prevent disinfectant from entering the lumen and fluid path while providing effective disinfection of the surrounding connector or fitting.” The cap has to bathe the outside while plugging the inside.

What This Invention Does

Claim 1 begins “A cap comprising:” and then describes the inside of a moulded plastic cup in unusual detail. There is a top wall and an essentially cylindrical sidewall forming a cavity. There is an open bottom for receiving the hub of a male luer connector. And there is a ball.

The cavity is divided along its length. A first portion sits next to the open bottom and has a tapered sidewall whose diameter D2 is smaller than the ball, and that diameter increases moving up away from the opening. Above it is an indented portion, a groove running around the bore. Above that is a second portion whose diameter D1 is larger than the ball, carrying a set of channels cut into its surface and holding the disinfectant or antimicrobial agent. The ball sits in the indented portion, and claim 1 states that the indented portion and the ball together form a liquid seal.

That arrangement does three jobs with one part. Before use, the ball is wedged in the groove and the seal keeps the disinfectant shut in the upper chamber. The taper below the groove is narrower than the ball, so the ball cannot fall out of the open bottom. And because the chamber above the groove is wider than the ball, the ball can be pushed up into it when the connector arrives.

The specification describes what happens on connection. The tapered hub of the male fitting enters the open bottom and pushes the ball in the distal direction, out of the groove and up into the wider chamber. That breaks the seal and, as paragraph 101 puts it, the top flow channels give the liquid a path past the ball so the disinfectant is released, “bathing the periphery of the male connector.” Lower channels on the first portion, added by dependent claim 4, “promote disinfectant or antimicrobial agent permeation towards the mating surface” so the liquid reaches the conical sealing face of the hub. At the same time the ball is pressed against the end of the spigot: “the ball simultaneously blocks a lumen of the male connection, thus mitigating antimicrobial agent or fluid from entering the device’s fluid path or lumen. The seal created between the ball and the lumen of the male connection is aided by ball deformation.”

That last clause is why the material matters. The preferred ball is compressible, made from a thermoplastic elastomer, a thermoplastic olefin or a similar deformable material, so it squashes against the rim of the lumen and conforms to it. The specification also contemplates the reverse, a rigid ball that deforms the housing instead. The housing itself is described as polycarbonate, polypropylene or polyethylene, with polypropylene or polyethylene preferred.

The dimensions given are small and specific. The indented groove is defined by an arc with an included angle between 3 and 5 degrees, whose centre sits 3.5 to 4.5 mm from the opening to the cavity, and the cavity diameter where that arc begins is between 4.5 and 5 mm. The outward taper at the open bottom is located 0.2 mm to 1 mm from the bottom edge. The disinfectant is drawn from a long list headed by isopropyl alcohol, ethanol and 2-propanol, with chlorhexidine gluconate and chlorhexidine diacetate named as a preferred pairing.

Dependent claims fill in the rest of the product. Claim 2 adds an outer thread to interlock with the fitting. Claim 3 adds tabs in the lower portion for an interference fit with the hub. Claim 5 introduces an absorbent material in the cavity alongside the ball, which later description identifies as a nonwoven, a sponge or an open cell polyurethane foam sitting behind the ball and squeezed on connection to release its charge of disinfectant. Claim 12 adds the removable foil or film cover that seals the whole thing until use. Claims 13 to 15 cover the outside: grip ribs, an outward taper toward the top wall and finger grips in an elastomeric material, which are the details that let a gloved hand twist a cap the size of a pencil eraser.

Key Features

• A ball that seals the lumen rather than the whole connector. The central element of claim 1 is a ball held in the cavity that, on connection, is pressed against the open end of the male fitting and blocks it, keeping disinfectant out of the fluid path while it washes the outside.
• An indented groove that doubles as the storage seal. The ball seats in a circumferential indent in the bore, and claim 1 states that the indent and the ball together form a liquid seal, so no separate gasket or plug is needed to keep the disinfectant in before use.
• A taper narrower than the ball at the open end. The first portion of the cavity has diameter D2 smaller than the ball and increasing toward the top wall, which retains the ball in the cap and also forms the interference fit against the incoming hub.
• Flow channels above and below the seat. Top channels in the wider upper chamber let disinfectant escape past the ball once it lifts out of the groove, and lower channels in dependent claim 4 route the liquid toward the conical mating surface of the connector.
• A deformable ball material. The preferred ball is a thermoplastic elastomer or olefin that squashes on contact, because the seal against the lumen rim depends on the ball conforming to it rather than on machining tolerance.
• Optional absorbent reservoir behind the ball. Claim 5 adds absorbent material in the cavity, described in the body as a nonwoven, sponge or open cell polyurethane foam, compressed on connection to release its charge of disinfectant.

Who Is Behind It

Becton, Dickinson and Company is one of the largest medical technology companies in the world, founded in New Jersey in 1897 and listed on the New York Stock Exchange as BDX. Its business is precisely the territory this filing sits in: hypodermic needles and syringes, infusion sets, catheters, and a dedicated vascular access management division. Whatever else can be said about the claim, the applicant is not speculating about a market it does not already serve. Six inventors are named, Edward P. Browka, Chang Jiang, Amir Harandi, Tom Moskal, Jiayu Liu and Narasinha C. Parasnis, which is a development team rather than a lone designer.

On priority, this specification says nothing at all. There is no incorporation by reference paragraph, no cross reference to a related application and no convention claim anywhere in the body text, and the Australian title page carries no priority entry. The only relationship the document itself establishes is the divisional link to Australian application 2024202224. The Priority Country row therefore reads “Not stated,” and readers who need the full family history will have to obtain it from the register rather than from this document.

One point of clarification for anyone matching this filing to a product. The abstract describes the disclosure broadly, covering access ports of medical connectors, threaded or interlocking fittings, and disinfection caps generally, and only at the end narrows to “male disinfection cap devices for disinfecting male threaded luer connectors.” Claim 1 is narrower still. It is a cap for receiving “a hub of a male luer connector,” and every dependent claim that mentions a connector says male. So this is not one of the familiar caps that sits on the needleless connector at the patient end of the line. It is the mirror image, a cap for the spigot on the giving set or syringe, and its whole reason for existing is the open lumen that the female side does not have.

The document also carries a number of drafting errors. Reference numeral 338 appears as 378 and 387a, the arc is variously 338 and 378, the top flow channels are numbered 352 in one sentence and 342 in the next, the bottom channels are 352 then 344, and there are plain typographical faults including “preffered,” “con-nection” and a sentence that reads “pertains to a relates to a sterile cap 400.” The claims are clean, but the description needs careful reading.

Why It Matters

Bloodstream infection acquired through a vascular line is one of the better documented avoidable harms in hospital care, and it is a standing priority for the Australian Commission on Safety and Quality in Health Care as well as for its overseas counterparts. The interesting thing about the problem is that the fix has been known for years and the difficulty is entirely in getting it done reliably. A wipe with alcohol works, if it is done every time, for long enough, and if the connector is allowed to dry. Passive caps exist because designing the compliance problem out of the workflow turns out to be easier than training it out.

This specification does not present any clinical data, infection rate figures or laboratory kill time results. It is a mechanical document, and it should be read as one. Its contribution is narrow and, once stated, fairly obvious: if you want to extend passive disinfection to the male half of the connection, you have to solve the problem that the male half is a tube with a hole in it, and a dose of alcohol sitting in a cap will find that hole. Devices that block the lumen with a fixed plug have to be moulded to a tolerance, and a fixed plug that seals well enough to keep liquid out is also a plug that resists insertion. A loose, deformable ball that floats between a groove and a taper sidesteps both issues, because it is free to move and its seal comes from squashing rather than from fit.

Whether that is enough to be inventive over the existing art is a matter for the examiner, and it is worth noting that this is a divisional, which usually means the parent claims were contested or narrowed. What is clear is where the applicant thinks the novelty lies. It is not in disinfecting a connector, which the background concedes is state of the art. It is in the ball, the groove it sits in, and the two sets of channels that let the liquid past it in one direction but not the other.

Related Concepts

• Hospital-acquired infection – the broader category of infections contracted during care that catheter related bloodstream infection sits within.
• Bacteremia – bacteria present in the blood, the condition that results when an intravenous line is contaminated.
• Chlorhexidine – the antiseptic named alongside alcohol in the claimed disinfectant list and in the nursing standards quoted in the background.
• Asepsis – the practice of keeping a clinical procedure free of contaminating organisms, which the cap automates for one specific step.
• Interference fit – the deliberately tight assembly used both to retain the ball and to grip the hub of the connector.

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AU 2026202177 was published in the Australian Official Journal of Patents on 9 April 2026 and is open for public inspection. Patent applications represent inventions that are sought to be protected and do not necessarily reflect commercially available products.