Moor Instruments manufacture a wide range of probes designed to help you assess flow from almost any tissue. We are more than happy to advise on your particular application but hope too that the following general notes are useful.

• Skin probes [0]
• Needle probes [0]
• Endoscopic probes [0]
• Low profile [0]
• Master/ Single Fibre probe system [0]

Skin probes are available with two main fibre configurations, twin or multi-fibre designs. Multi fibre designs usually contain a ring of up to eight collecting fibres around a central delivery fibre. This provides an averaged signal for a larger tissue area than would otherwise be provided by the conventional twin fibre model.

Skin probes are usually fixed directly to the skin with double sided adhesive discs, although they can be used in other applications (e.g. bone, visceral measurements) and with other equipment (e.g. Iontophoresis). Please refer to the Accessories and Iontophoresis catalogues.

DRT4 users can specify combined laser Doppler and temperature probes. Skin probes usually combine the temperature measurement within the probe head itself although it is possible to supply any probe with a separate temperature measuring branch. Please call for details.

The standard length for all probes is 2 metres. Longer lengths can be supplied on request. The range of probe holders for these (and other) probes is described in the accessories page.

DP1-V2 and DP1b-V2 Skin Probe An optic probe that delivers light at a right angle. The probe has a height of 12.5mm and a diameter (at the probe tip) of 8mm OD. The probe has a groove around the tip to allow flexible PH1-V2 and PH1-V2s probe holders to "clip" in (see accessories). Fibre separation is 0.5mm. Cable 3mm OD. A DP1b-V2 is as a DP1-V2 with a fibre separation of 0.25mm for a shallower measurement.

DP1/7-V2 and DP1T/7-V2 Skin Probe This is a large area probe that consists of 8 collecting fibres in a 2mm ring with a central delivery fibre. Shares the same dimensions as the DP1-V2. A DP1T/7-V2 is as a DP1/7-V2 but with temperature measurement

DP2T and DP2Tb Skin Probe A combined temperature and optic probe. The probe body is a plastic cylinder 30mm high with a 6mm OD. Fibre separation is 0.5mm. Lead diameter is 3mm OD. A DP2Tb is as a DP2T with a fibre separation of 0.25mm. Iontophoresis: used with ION1-P2 and ION3-P2 chambers.

DP7a/T Skin Probe A combined temperature and a large area optic probe consisting of 8 collecting fibres on a 2mm ring with a central delivery fibre. The probe body is a plastic cylinder 30mm high with a 6mm OD. Lead diameter is 3mm OD. Iontophoresis: used with ION1-P2 and ION1-P2 chambers.

Needle probes are amongst the most versatile designs. They can be used for surface measurements, inserted into tissue or used for single vessel measurements. The compact design also lends itself to measurements in tissues with restricted access, e.g. teeth, conjunctiva and where micromanipulation is required.

Probes can be fixed in position over tissue with a normal laboratory manipulator by clamping onto the black acetal shank.

Deeper measurements are possible by inserting the probe tip into tissue bulk, for which finer needles are suitable (P4, P4s, P4sd). The finest needles can be inserted directly with the application of gentle pressure. Larger needles can still be used although it may be necessary to puncture the tissue first.

The use of specific probe holders can extend the application range of needle probes further still. Wet stick probe tips can be used to aid adhesion to moist/ mucosal surfaces. Dental putty can be used to create an individual probe holder for tooth measurement. Angled needle probes can be used to access hind teeth.

Although laser Doppler is not usually advocated for assessment of flow in single vessels, there is a role for the technique in the assessment of flow changes in small individual vessels. Moor manufactures a range of probe holders to aid this measurement.

DP3 and DP3b Blunt Needle End Delivery Probe A hypodermic stainless steel tube of external diameter 1.5mm. The length is normally 10mm to 80mm. Separation of fibres is 0.5mm. A DP3b is as a DP3 with a fibre separation of 0.25mm

DP5a and DP5b Blunt Needle 90 degree End Delivery Probes DP5a probes are hypodermic stainless steel tubing with angled tip providing right angled delivery for ease of access to some measurement sites such as the oral mucosa and teeth. The DP5a has a tube diameter of 1.5mm and DP5b has a tube diameter of 0.8mm. The length of the probe can be specified between 30mm-80mm and the right angle extension length between 5mm-10mm. The DP5a has a fibre centre separation of 0.5mm and DP5b has a fibre centre separation of 0.25mm.

DP7b Blunt Needle End Delivery Probe Multiple Collector Fibres The large area probe uses 8 collecting fibres positioned in a ring, diameter 2mm, around the central light delivery fibre. The DP7b is a stainless steel tube of diameter 3mm and standard length 30mm. Tube length up to 120mm available. The light collecting area for DP7 type probes is approximately 10 times that of a standard probe. Note: See DP7a.

Endoscopic probes enable internal investigations of blood flow in tissue beds such as colon, bronchus and urethra. The probes are available in a wide range of diameters to fit the biopsy channel of most endoscopes. All are made from a flexible yet tough nylon sleeving.

The finer diameter probes, although generally more delicate, can be used with some naso-gastric tubes: the tip of the n.g. tube is removed to allow an end viewing probe to protrude for measurement.

The standard length for all endoscopic probes is three metres. Longer lengths can be supplied and are particularly useful for larger animals (e.g. horses)

DP6a and DP6b Endoscope End Delivery Probe An end delivery endoscope probe with flexible nylon sleeving. The DP6a has 2.1mm diameter sleeving and P6b has 1.35mm diameter sleeving. Both probes have steel tips, 6mm length, surrounded by the nylon sleeving. The DP6a has a fibre separation of 0.5mm and the DP6b a fibre separation of 0.25mm. Standard fibre length is 3m. Also available are single fibre probes with detachable ‘slave’ connectors.

DP6L Rectal Side Delivery Probe The probe tip is a 7.94mm O.D silicon tube formed into a 30 – 70mm loop. The 2.77mm O.D nylon tube that constitutes the optical lead is sheathed in the silicon tube to a distance of 450mm +/- 30mm from the optical aperture. Light is delivered at a right angle to the measurement area via a metal tube bent at a 90º. The DP6L is a side delivery probe especially designed for measuring rectal blood flow. Standard length probe to optic connector is 3m.

Low profile designs are either used where access is difficult (e.g. oral mucosa) or to reduce application pressure if the probe is to be covered by bandages. Various designs are available, including the titanium disc probe and the near flat silicon probe.

DP8c Low Profile Right Angle Delivery Suturable Probe The DP8c titanium disc probe has a 2.1mm OD flexible nylon sleeve with a titanium disc probe head. The probe head is 8mm OD and 2.5 mm high. The head has 4 suture holes drilled in it to provide stability during measurements. Light is delivered at a right angle from the probe head via a central window.

DP10M100ST & DP10M 200ST Master/ single fibre probe system. Master probes are twin fibre designs, acting as a link between the monitor and the Slave probe tip. The Master probe connects to the single fibre probe tip via an optical in-line connector (order code PCP).

This system offers a number of advantages over more conventional probe designs. The benefits include;

1. Small diameter probe tips (down to 250micron) for minimally invasive measurements.

2. Wide choice of single fibre probes for diverse measurements. Just connect a new probe tip for a change to muscle, cerebral, gastric, organ or endoscopic (etc.) applications. This represents an economic solution if you intend to sample a number of different tissues.

3. Single fibre probes are supplied with re-usable, detachable connectors (order code PCN). Probes tips can be sterilised easily for re-use or treated as disposable (see P10d, P10k,P10s-TCG). Moor Instruments can also supply the materials for you to construct your own single fibre probes.

4. For longer-term measurements the Master can be disconnected to leave the single fibre in position between measurement periods.

P10d Single Fibre probe NOT SUITABLE FOR HUMAN USE. The P10d is a single plastic fibre, sleeving 0.5mm diameter, with a detachable optic connector. The fibre can therefore be treated as a disposable item or sterilised for re-use. Use with DP10M200ST.

P10s-TCG Single Fibre probe NOT SUITABLE FOR HUMAN USE. A P10s-TCG is a single glass fibre probe diameter 0.26mm OD with a fixed connector. Use with DP10M100ST.