Internal Electrodes

How practitioners use internal electrodes

Internal electrodes connect to a muscle stimulator or biofeedback unit to deliver electrical stimulation, or to read muscle activity, directly at the pelvic floor. They're used across two main applications: neuromuscular electrical stimulation (NMES) to help patients who struggle to isolate the right muscles, and EMG biofeedback, where the probe reads muscle contraction and displays it back to the patient in real time.

For female electrode placement for pelvic floor work, the intra vaginal probe is the standard choice. For male patients, or where rectal access is more appropriate, the intra-anal probe does the same job through a different route. Both connect to the same range of stim and biofeedback devices, so electrode placement for pelvic floor muscles comes down to anatomy and clinical preference rather than the equipment itself.

Periform® vs Anuform®: choosing the right probe

Periform®+ is the intra-vaginal option. It's built with medical grade surgical stainless steel electrodes on a rectangular-section probe body designed to resist lateral movement once in place, which helps keep contact consistent during a session. It's single patient use, with an in-use product lifetime of around 6 months, and connects to most muscle stimulators and biofeedback equipment (check your specific device's instructions first).

Anuform® covers both intra-anal and intra-vaginal use from the same probe, which makes it a practical choice for clinics treating a broader mix of patients without stocking two separate product lines.

Both are consumables in the true sense: they're fitted to a patient, used for a defined period, then replaced. If you're already running, NMES or biofeedback equipment in clinic, these probes are the accessory that makes internal work possible on that same device.

Ordering for clinics and organisations

trimbio supplies NHS Trusts, private clinics, and continence and women's health services across the UK. If you're setting up a pelvic health service or restocking probes across multiple clinicians, get in touch and we can advise on quantities. Orders over £75 ex VAT qualify for free standard delivery, dispatched within 2 working days.

Explore our electrotherapy accessories range for leads, gels and power supplies to go with your probes, or see our self adhesive electrodes if you also need surface electrodes for general stimulation work.

Frequently asked questions

What's the difference between the Periform®+ and Anuform® probes?

Periform®+ is an intra-vaginal probe, while Anuform® is designed for both intra-anal and intra-vaginal use. Both connect to standard muscle stimulation and biofeedback equipment and are used for pelvic floor assessment and treatment.

Is an intra vaginal probe single patient use?

Yes. Periform®+ is single patient use, made from medical grade surgical stainless steel electrodes, with an in-use product lifetime of around 6 months under normal clinical use.

What electrical stimulation devices are these probes compatible with?

Both probes are designed to work with most muscle stimulators and EMG biofeedback units. Always check your specific device's manufacturer instructions before use to confirm connector compatibility.

Is a vaginal scan probe the same as an intra vaginal probe?

No. A vaginal scan probe refers to an ultrasound imaging transducer used for diagnostic scanning. The intra vaginal probes on this page, such as Periform®+, are electrotherapy and biofeedback accessories used for pelvic floor muscle stimulation, not diagnostic imaging.

How is electrode placement decided for pelvic floor stimulation?

Placement depends on the treatment goal and patient anatomy. Vaginal probes suit most female pelvic floor protocols, while intra-anal probes are used for male patients or where rectal access is clinically preferred. Both connect to the same stimulation or biofeedback device.