United States Patent 8,162,915: Scope, Claim Boundaries, and U.S. Landscape
United States Patent 8,162,915 claims a medical bag connector with an injection-molded pinch-off (elastically deformable) tubular section and a separate closure part that closes the passage. The independent claim set centers on a specific geometry (tubular portion with a noncircular axial cross section that differs in two perpendicular directions) combined with an integrated, same-polymer base/pinching-off structure and optional features for snap-fit closure and self-sealing membrane piercing. Claims also specify a breakable cap-style closure with flow direction arrowing and a “boat-shaped” base.
What matters for scope is not just “valve-like pinch-off.” The claims tie together: (i) structure, (ii) material identity (same polymer for base and pinching-off), and (iii) how the passage is sealed (closure part and optionally membrane).
What does the patent claim as the core invention? (Independent claim scope)
Claim 1 (and Claim 11): the independent “connector”
Claims 1 and 11 are substantively duplicated, with only numbering differences. The independent structure is:
- Connector for packings containing medical liquids (infusion/transfusion/enteral bags).
- A connecting part that is an injection-molded component with a passage to accommodate a rod or spike for filling or withdrawal.
- The connecting part comprises an elastically deformable pinching-off part:
- Re-assumes original shape after being pinched by a pinching device.
- Is a tubular portion with a noncircular axial cross section that is different in two mutually perpendicular directions.
- A base part merges into the pinching-off part:
- Base widens to both sides.
- Base is integratable in the packing.
- The pinching-off part comprises the same polymer as the base part.
- A closure part:
- Fits onto the connecting part.
- Closes the passage in the connecting part.
Claim-critical construction details
- Noncircular axial cross section, anisotropic across two perpendicular directions (this is a geometric limitation, not a functional one).
- Same polymer between base and pinching-off portion (material identity limitation).
- Closure part closing the passage (an additional sealing component beyond just the pinch-off deformation).
Claim 10 (and Claim 20): “packing” claims
- Claim 10 and Claim 20 claim a packing (bag) having at least one connector as claimed in claim 1 (or claim 11).
This gives the patent both component and system coverage at the “bag contains at least one connector with these features” level.
What dependent claims narrow scope with sealing and assembly features?
Snap-fit retention (Claims 2 and 12)
- The closure part and connecting part are secured with a snap fit.
This narrows coverage to connectors where the closure and connecting element mate via a snap-fit mechanism rather than e.g., threads, adhesives, heat welding, or friction fit without snap features.
Self-sealing membrane between connecting and closure (Claims 3-4 and 13-14)
- A self-sealing membrane is arranged between connecting part and closure part.
- The membrane is pierceable by the spike for withdrawal.
- The membrane is held clamped with elastic deformation between connecting part and closure part.
This adds a “membrane interface” substructure:
- a membrane exists in the connector system,
- it is pierced by the spike,
- it is mechanically captured via elastic clamping.
Breakable cap-shaped closure with flow direction arrow (Claims 5-9 and 15-19)
The closure part structure is further defined as:
- A cap-shaped bottom part adjoined via an annular break zone to a top part that can be broken off.
- The break-off top is designed as a flat grip piece.
- The cap bottom and/or grip piece is identified by an arrow indicating flow direction.
- The arrow is a recess and/or raised structure.
- Base part is designed in the shape of a boat.
This dependency pack is important because it carves out a fairly specific closure and user-facing directional marking scheme.
What is excluded or harder to design around based on claim structure?
Because the independent claims include multiple interlocking structural constraints, design changes need to avoid at least one required element. The main “avoidance levers” are:
Avoidance lever A: the noncircular anisotropic tubular cross section
The independent claims require:
- a tubular portion
- with a noncircular axial cross section that is different in two perpendicular directions.
A circular cross section (or a noncircular cross section that is the same in both perpendicular directions, depending on interpretation) is a direct route out of literal scope.
Avoidance lever B: polymer identity between base and pinching-off portion
Independent claims require:
- the pinching-off part comprises the same polymer as the base part.
If a competitor uses:
- different polymer materials for the pinch-off component versus base insert,
- or co-molding with different polymers in non-identical portions,
then literal infringement becomes more difficult.
Avoidance lever C: the presence and role of the closure part
Independent claims require:
- a closure part that fits onto the connecting part and closes the passage.
A design that relies solely on a different mechanism for sealing the passage (for example, a permanent elastomer plug without a closure part that “fits onto” and closes the passage) may fall outside.
Avoidance lever D: pinch-off geometry/material may still matter even if a pinch device is used
The claims do not merely require “a pinch-off element that springs back.” They require:
- the spring-back deformable pinch-off part
- having the specified tubular noncircular cross section and same-polymer linkage to the base.
So even if a competitor uses a pinch-off valve-like structure, matching the specified geometry and polymer identity is a critical risk.
What is likely covered: product forms and functional use cases
Connector mechanics
The connector supports:
- filling/withdrawal via rod or spike through a passage,
- a pinching device that elastically pinches the pinching-off portion and allows recovery.
System-level use
The packing claims cover:
- medical bags containing at least one such connector.
Sealing variations within the claims
- Baseline: closure part closes passage.
- Optional: self-sealing membrane plus clamping.
- Optional: break-off cap grip structure with directional arrowing.
These options allow claim breadth to cover multiple marketed variants so long as the independent geometry and polymer constraints are met.
Claim-by-claim landscape map (U.S. practical reading)
| Claim |
What it adds or tightens |
Likely infringement relevance |
| 1 / 11 |
Core connector: injection-molded connecting part; elastically deformable pinch-off tubular portion with noncircular anisotropic axial cross section; base merges and widens; same polymer in base + pinch-off; closure part fits and closes passage |
Highest value; defines literal scope |
| 2 / 12 |
Snap fit between closure and connecting part |
Important for specific assembly designs |
| 3 / 13 |
Self-sealing membrane between connecting part and closure; piercable by spike |
Important if membrane-based venting/entry/withdrawal used |
| 4 / 14 |
Membrane held clamped with elastic deformation |
Narrows to membrane retention mechanics |
| 5 / 15 |
Closure includes cap-shaped bottom + annular break zone + break-off top |
Narrows closure mechanism |
| 6 / 16 |
Break-off top is flat grip piece |
Narrows grip geometry |
| 7 / 17 |
Arrow indicating flow direction on cap bottom and/or grip |
Narrows user interface feature |
| 8 / 18 |
Arrow is recess and/or raised structure |
Narrows arrow structure |
| 9 / 19 |
Base part is boat-shaped |
Narrows base form factor |
| 10 / 20 |
Packing contains at least one claim 1/11 connector |
System claims depend on connector scope |
What does the patent landscape imply for competitors? (Design-around and risk zones)
High risk zone (literal alignment likely)
Competitors face the highest infringement risk if their connector:
- has a pinch-off element that springs back after pinching,
- uses a tubular portion with an anisotropic noncircular axial cross section,
- uses the same polymer for the base and pinch-off portion,
- includes a closure part that closes the passage.
Even if other features differ (snap fit vs not; membrane vs not; breakable cap vs not), meeting the independent claim elements drives risk.
Medium risk zone (dependent features may matter)
For products that satisfy claim 1/11 geometry/material requirements, dependent features then stratify further risk:
- snap-fit assembly (Claims 2/12),
- membrane piercing (Claims 3/13),
- membrane clamping (Claims 4/14),
- cap-shaped break zone closure and flow arrowing (Claims 5-9/15-19),
- boat-shaped base (Claims 9/19).
Lower risk zone (avoid at least one independent element)
Design changes are most effective if they break at least one independent requirement:
- move to circular cross sections,
- change polymer assignment between pinch-off and base,
- remove or structurally change the closure part that closes the passage,
- change the interface concept so the “pinching-off tubular portion with specified anisotropic noncircular cross section” is not met.
How strong is the claim set as a freedom-to-operate hurdle?
The set is structured to be harder to evade because:
- the independent claim bundles geometry + material identity + closure architecture in one sentence chain,
- the dependent claims provide multiple alternate ways to add features (snap fit, membrane, breakable cap and arrow), meaning accused products could match either baseline closure or a more specific marketed variant.
So the patent functions less like a single-feature claim and more like a “connector architecture” claim with several optional refinements.
Key Takeaways
- U.S. Patent 8,162,915 claims a medical bag connector with a pinch-off tubular portion having an anisotropic noncircular axial cross section, a base merging into the pinch-off part, and same-polymer construction for those parts.
- A closure part that fits onto the connecting part and closes the passage is mandatory in the independent claim scope.
- Dependent claims add specific build modes: snap fit, self-sealing membrane that is pierced and elastic-clamped, and a break-off cap with flow arrow and optional boat-shaped base.
- For design-around, the highest-impact levers are to avoid the anisotropic noncircular cross section, break same-polymer identity, and/or alter the role/structure of the passage-closing closure part.
FAQs
1) Do Claims 1 and 11 differ in scope?
No material differences are evident in the provided claim text. They recite the same connector architecture with different numbering.
2) Is a self-sealing membrane required to infringe?
No. The membrane appears only in dependent claims (3-4 and 13-14). The independent claims require the closure part closing the passage, not a membrane.
3) If a product uses a snap fit but not a self-sealing membrane, is it still within scope?
If the product satisfies the independent claim elements (pinch-off tubular anisotropic noncircular cross section, same polymer linkage, and closure part closing the passage), then snap fit aligns with dependent claims but is not required by the independent scope.
4) What single feature is most effective for design-around?
The noncircular axial cross section that differs in two mutually perpendicular directions is the most explicit geometry limitation in the independent claim text.
5) Do the packing claims require multiple connectors?
No. Claims 10 and 20 require a packing having at least one connector meeting claim 1 or claim 11.
References
- United States Patent No. 8,162,915.
