Quick Release Couplings for NIBP Blood Pressure Monitoring Equipment
Non-invasive blood pressure (NIBP) monitors use an inflatable cuff and a pneumatic hose to measure blood pressure without an invasive arterial line. For equipment manufacturers and service teams, the pneumatic connection between the monitor, hose and cuff is a small but important part of the system: it must provide a secure air path while allowing the relevant components to be connected, changed or serviced.
What is an NIBP monitor?
NIBP equipment measures a patient's blood pressure using an inflatable cuff placed around a limb. Automatic monitors commonly use an oscillometric measurement method. The monitor inflates the cuff, senses pressure oscillations transmitted through the cuff and hose, calculates the blood pressure values and then deflates the cuff.
NIBP measurement may be provided by a dedicated blood pressure monitor or incorporated into wider patient-monitoring equipment. The exact pneumatic layout, cuff type, hose arrangement and connector design vary between manufacturers and models, so replacement components must always be checked against the equipment specification.
How does the pneumatic system work?
1. Cuff connection
A pneumatic hose connects the monitor's NIBP system to the inflatable cuff. Depending on the equipment design, the hose may use one or more pneumatic paths.
2. Inflation
The monitor supplies air through the hose to inflate the cuff to the pressure required for the measurement cycle.
3. Pressure measurement
Pressure changes and oscillations from the cuff are transmitted through the pneumatic circuit and used by the monitor to determine the blood pressure reading.
4. Deflation
Once the measurement is complete, the monitor controls cuff deflation and the system returns to its non-measuring state.
Where does a quick-release connection fit?
A detachable pneumatic connection can provide an interface between the monitor and its hose assembly, or elsewhere in the cuff and tubing assembly where the equipment design requires a removable connection. This can allow hoses, cuffs or service components to be removed without repeatedly disturbing permanent pipework or internal pneumatic connections.
The exact connection point is equipment-specific. When specifying a replacement or OEM connection, the existing interface, tubing dimensions, flow requirements, sealing arrangement and equipment manufacturer's requirements must be confirmed.
What matters when selecting a coupling for NIBP equipment?
Compact dimensions
Patient-monitoring equipment can have limited space around external ports and internal pneumatic assemblies, making overall connector size an important design consideration.
Simple operation
Where a connection is routinely made and broken, straightforward operation can simplify hose changes and equipment handling.
Secure pneumatic connection
The connection forms part of the pressure path between the monitor and cuff. Correct mating, sealing and installation are therefore important to the intended equipment operation.
Correct interface
Tube size, thread, plug profile and valve arrangement must match the actual equipment design. A physically similar connector should not be assumed to be compatible.
Kee 720 Series for compact pneumatic connections
The Kee Connections 720 Series is a miniature Straight Through quick-release coupling with a 2.7 mm nominal diameter. Kee's catalogue identifies the series as frequently used in medical technology and highlights its small dimensions and single-handed operation. These characteristics make the 720 Series relevant for investigation where compact detachable pneumatic connections are required in equipment such as NIBP systems.
720 Series | Straight Through Quick Release Couplings & Plugs
Straight through coupling for the connection of coolant lines to mould tools. No valve — allows full flow when connected or disconnected. Suitable for water, grease, air and oil.
Coupling Specifications
Back Body: Brass (MS 58)
Valve Body: Brass (MS 58)
Sleeve: Brass (MS 58)
Spring: Stainless Steel 301
Locking Ring: Stainless Steel 301
Locking Balls: Stainless Steel 301
coated) — Seals: FKM (PTFE
Plug Specifications
Plug Body: Brass (MS 58)
View the complete Kee 720 Series
Available 720 Series configurations
The table below is pulled directly from the Kee catalogue data so current part numbers and available configurations remain tied to the live series information.
Male Thread BSPP Coupling
| Part Number | Thread | Length | Diameter |
|---|---|---|---|
| 720CVMM50BNN | M5 | 26mm | 10mm |
| 720CVMP18BNN | 1/8" | 28mm | 10mm |
Female Thread BSPP Coupling
| Part Number | Thread | Length | Diameter |
|---|---|---|---|
| 720CVFM50BNN | M5 | 26mm | 10mm |
| 720CVFP18BNN | 1/8" | 28mm | 10mm |
Hose Tail Coupling
| Part Number | Length | Diameter | Hosetail |
|---|---|---|---|
| 720CVHT03BNN | 28mm | 10mm | 3mm |
| 720CVHT04BNN | 35mm | 10mm | 4mm |
| 720CVHT05BNN | 35mm | 10mm | 5mm |
Bulkhead To Hose Tail Coupling
| Part Number | Length | Diameter | Hosetail |
|---|---|---|---|
| 720CVBH03BNN | 51mm | 10mm | 3mm |
| 720CVBH04BNN | 51mm | 10mm | 4mm |
| 720CVBH05BNN | 51mm | 10mm | 5mm |
Tube Connection Coupling
| Part Number | Length | Diameter | Tube Size |
|---|---|---|---|
| 720CVTC04BNN | 33mm | 10mm | 3 x 4mm |
| 720CVTC05BNN | 33mm | 10mm | 3 x 5mm |
| 720CVTC06BNN | 33mm | 10mm | 4 x 6mm |
Bulkhead To Tube Coupling
| Part Number | Length | Diameter | Tube Size |
|---|---|---|---|
| 720CVBT04BNN | 33mm | 10mm | 3 x 4mm |
| 720CVBT05BNN | 45mm | 10mm | 3 x 5mm |
| 720CVBT06BNN | 45mm | 10mm | 4 x 6mm |
Male Thread BSPP Plug
| Part Number | Thread | Length |
|---|---|---|
| 720PNMM50BXN | M5 | 18mm |
| 720PNMP18BXN | 1/8" | 20mm |
Female Thread BSPP Plug
| Part Number | Thread | Length |
|---|---|---|
| 720PNFM50BXN | M5 | 17mm |
| 720PNFP18BXN | 1/8" | 19mm |
Hose Tail Plug
| Part Number | Length | Hosetail |
|---|---|---|
| 720PNHT03BXN | 24mm | 3mm |
| 720PNHT04BXN | 24mm | 4mm |
| 720PNHT05BXN | 24mm | 5mm |
Bulkhead To Hose Tail Plug
| Part Number | Length | Hosetail |
|---|---|---|
| 720PNBH03BXN | 45mm | 3mm |
| 720PNBH04BXN | 45mm | 4mm |
| 720PNBH05BXN | 45mm | 5mm |
Tube Connection Plug
| Part Number | Length | Tube Size |
|---|---|---|
| 720PNTC04BXN | 25mm | 3 x 4mm |
| 720PNTC05BXN | 25mm | 3 x 5mm |
| 720PNTC06BXN | 25mm | 4 x 6mm |
Bulkhead To Tube Plug
| Part Number | Length | Tube Size |
|---|---|---|
| 720PNBT04BXN | 38mm | 3 x 4mm |
| 720PNBT05BXN | 38mm | 3 x 5mm |
| 720PNBT06BXN | 38mm | 4 x 6mm |
720 connection options relevant to small-bore pneumatic equipment
The 720 Series includes threaded, hose-tail, tube-connection and bulkhead configurations. Current catalogue options include M5 and 1/8" BSPP threads, 3 mm to 5 mm hose tails and tube connections for 3 x 4 mm, 3 x 5 mm and 4 x 6 mm tube. The correct termination must be selected from the actual monitor, hose or OEM interface rather than from the application type alone.
Tubing and hose considerations
NIBP systems also depend on the tubing between the monitor and cuff. Kee supplies a range of pneumatic tubing, including polyurethane and Nylon 12 products, but the fact that a tube is suitable for general pneumatic service does not by itself establish suitability for a particular medical device.
For an OEM or replacement application, tubing should be assessed against the equipment manufacturer's requirements, including dimensions, flexibility, pressure behaviour, material requirements, cleaning regime and any applicable medical-device validation or regulatory requirements.
Why the 720 Series is relevant to NIBP applications
The relevance of the 720 Series is not simply that it is a small coupling. Its catalogue specification combines a miniature 2.7 mm nominal diameter, Straight Through operation, nickel-plated brass construction and a range of small threaded, hose-tail, tube and bulkhead terminations. Kee also specifically records frequent use of the series in medical technology.
For an NIBP equipment manufacturer, repairer or component supplier, this makes the 720 Series a logical Kee range to investigate where a compact detachable pneumatic interface is required. Final selection still depends on the particular equipment design and operating requirements.
OEM, replacement and assembly support
Kee Connections can support OEMs and equipment suppliers with individual couplings and plugs or with configured hose and coupling assemblies. Where an existing NIBP connector needs to be identified or replaced, photographs, plug-profile dimensions, tube dimensions, connection details and equipment information provide a useful starting point for technical review.
For new equipment, Kee can review the required connection point and help determine the appropriate series, termination and assembly arrangement before samples or production quantities are specified.
FAQs
What type of connection is used on an NIBP monitor?
The design varies by manufacturer and model. NIBP equipment typically uses pneumatic tubing between the monitor and inflatable cuff, with detachable connectors used where the equipment design requires the hose or cuff assembly to be removable.
Which Kee coupling series is relevant to NIBP equipment?
The Kee 720 Series is the primary range considered in this application because it is a miniature 2.7 mm Straight Through coupling and Kee's catalogue records frequent use in medical technology. The exact configuration must still be matched to the equipment.
Can the 720 Series connect directly to small pneumatic tubing?
The 720 range includes hose-tail, tube-connection and bulkhead options alongside threaded versions. Available sizes should be checked against the actual tubing and equipment interface before selection.
Does use in medical technology mean the 720 Series is approved for every medical device?
No. Application suitability, regulatory requirements and any required approvals must be established for the particular device and installation. The catalogue's medical-technology reference should not be treated as blanket approval for all medical equipment.
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