BL-61 (Pu Can) Subservient Visitor

What does BL-61 Pu Can do?

BL-61 relaxes the sinews, activates the channel and alleviates pain — a single recorded action — and it is a Meeting Point of the Bladder channel with the YANG MOTILITY VESSEL (Yang Qiao Mai).

• Relaxes the sinews, activates the channel and alleviates pain — the whole of the recorded action
• Meeting Point of the Bladder Channel with the Yang Motility Vessel — its recorded classification

Three Yang Motility roles on three nearby points, verified from our own records. This short stretch of the Bladder channel at the ankle carries the Yang Qiao Mai three different ways, and querying our category fields confirms all three:

• BL-59 Fu Yang — Xi-Cleft Point of the Yang Motility Vessel, 3 cun above BL-60
• BL-61 Pu Can — Meeting Point with the Yang Motility Vessel, 1.5 cun below BL-60 — this point
• BL-62 Shen Mai — Confluent Point of the Yang Motility Vessel, below the outer ankle bone

Three roles in a span of a few inches. The Yang Qiao Mai is classically described as beginning in this region and governing the outer aspect of the leg, and the density of designations here reflects that.

And a complete classical set, confirmed while checking this point. The Xi-Cleft points are usually taught as twelve, one per regular channel — but the full classical count is sixteen, adding one for each of four extraordinary vessels. Querying every category field in our data returns exactly sixteen: the twelve (LU-06, LI-07, ST-34, SP-08, HT-06, SI-06, BL-63, KI-05, P-04, SJ-07, GB-36, LIV-06) plus BL-59 for the Yang Motility, KI-08 for the Yin Motility, GB-35 for the Yang Linking and KI-09 for the Yin Linking vessels. A complete set, with no gap and no surplus.

Source: Sacred Lotus sources & references (channel, category, action and location records; every Yang Motility designation and every Xi-Cleft designation queried and counted against our own data), cross-referenced against multiple online sources.

What is BL-61 Pu Can used for?

BL-61 is used for wasting and weakness of the legs, and for pain in the heel. Our own indication record is reproduced here in full — two entries.

• Muscular atrophy and weakness of the lower extremities
• Pain in the heel

Two entries, and the page will not stretch it. Heel pain is local — the point sits on the heel bone. Leg weakness is the channel indication. There is no organ action and no systemic indication recorded here at all. Where a record is short this library says so rather than filling the space, as on BL-06, BL-38, BL-45 and DU-07.

Weakness is where the Yang Motility classification earns its place. The Yang Qiao Mai is classically associated with movement and with the muscle tone of the outer leg — qiao carries the sense of lifting or nimbleness. A point on that vessel recording leg weakness and wasting is coherent with the classification rather than incidental to it, and this library notes the correspondence where one exists.

An honest note. Wasting or progressive weakness of the legs requires medical assessment — it can indicate nerve or muscle disease and is not a symptom to work through. Heel pain that is severe, persistent, or follows an injury warrants assessment; sudden severe pain at the back of the heel with difficulty walking can indicate a ruptured Achilles tendon, which needs prompt medical care. This record documents classical use and should not delay either.

How it is combined. With BL-60 Kun Lun above and BL-62 Shen Mai in front, both at the ankle. With KI-03 Tai Xi on the inner side of the same ankle, and KI-04 Da Zhong, whose record also carries heel pain. With BL-57 Cheng Shan up the calf. All held here.

Source: Sacred Lotus sources & references (indication and category records; the BL-06, BL-38, BL-45, BL-57, BL-60, BL-62, DU-07, KI-03 and KI-04 records queried from our own data), cross-referenced against multiple online sources.

Where is BL-61 Pu Can located?

BL-61 is on the outer side of the heel, one and a half cun below BL-60, in a tender hollow on the heel bone itself.

• 1.5 cun inferior to BL-60 Kun Lun, on the lateral side of the foot
• In a tender depression on the calcaneum — the heel bone
• BL-62 Shen Mai lies forward of it, below the outer ankle bone; BL-60 above, between the ankle bone and the Achilles tendon

“A tender depression” is an unusual instruction, and worth noticing. Our record locates this point partly by tenderness — that is, by how it responds to pressure rather than purely by measurement from a landmark. Very few records in this library do that. It is the same principle as the classical ashi point, where the site is found by the patient’s reaction, applied here to a named point with a fixed measurement as well.

Located from another point, so an error propagates. BL-61 is measured from BL-60, which is itself located between the tip of the outer ankle bone and the Achilles tendon. The ankle-bone tip is a firm landmark, so the chain is short and reliable — and the heel bone gives an independent check, since the point sits on it.

On the name. “Pu Can” is translated in our record as Subservient Visitor, and it is one of the more opaque names in the system. The reading usually offered relates it to the posture of a servant bowing — in which the heel is raised and this part of it presented. Unlike most names on this channel it describes neither position nor function directly, which is why translations of it vary more than usual.

Source: Sacred Lotus sources & references (location and translation records, retained unchanged including the tenderness criterion; the BL-60 and BL-62 positions queried from our own data).

• A Manual of Acupuncture (p. 320): On the lateral side of the foot, 1.5 cun inferior to Kunlun BL-60, in a tender depression on the calcaneum.
• Chinese Acupuncture and Moxibustion (p. 189): Posterior and inferior to the external malleolus, directly below Kunlun (BL-60), lateral to calcaneum, at the junction of the red and white skin.

How is BL-61 Pu Can needled?

Our own record states perpendicular insertion of 0.3–0.5 inch, with moxibustion applicable. What follows is a neutral record of what the reference literature documents. It is not instruction, and this page does not teach technique.

• Angle and depth as recorded: perpendicular, 0.3–0.5 inch — shallow, and appropriate to a point sitting on bone.
• Moxibustion: recorded as applicable.
• Regional anatomy: the point lies over the calcaneus with only thin tissue above it; the lateral calcaneal branches of the sural nerve and the peroneal artery supply the region; the peroneal tendons pass forward above it.

Hazard, stated proportionately. This is a low-hazard point: no body cavity, no major vessel, no large nerve trunk, and the heel bone immediately beneath. The skin over the heel is thin and firmly bound down, which makes needling here notably sensitive — a matter of tolerability rather than danger, and recorded as such. Our record’s own use of “tender” as a locating criterion says as much.

What is not claimed. No study measuring a safe depth at BL-61 could be located, and none is borrowed. Neither of the two measured-depth studies this library uses reaches the foot: the paediatric chest CT covers 23 points on the trunk and shoulder, and the kidney-region MRI six points on the lower back. No case report naming BL-61 was located.

Source: Sacred Lotus sources & references (needling record, retained unchanged; the point lists of PMID 26922245 and PMID 36075596 queried and confirmed not to include BL-61), cross-referenced against multiple online sources; regional anatomy from standard anatomical description.

Is there research on BL-61, and what should a reader know?

No trial isolates BL-61. Where the point appears it is one component of a heel-pain or leg protocol, and a study that includes a point in a protocol is not evidence about that point. It is one of the less-used points on the channel and appears in fewer protocols than its neighbours.

Plantar heel pain has an acupuncture literature, but its protocols are multi-point and typically built around local ashi points and KI-03. Evidence about a protocol is not evidence about a point within it, and none is claimed here.

What this page can state with confidence — and the finding is bigger than this point. BL-61 is a Meeting Point with the Yang Motility Vessel, and checking that classification turned up three different Yang Qiao roles within a few inches of ankle: BL-59 the Xi-Cleft, BL-61 the Meeting Point, BL-62 the Confluent Point — all three confirmed by query. Checking the Xi-Cleft designations then showed the complete classical set of sixteen is present in our data: the familiar twelve plus BL-59, KI-08, GB-35 and KI-09 for the four extraordinary vessels. Our BL-63 record documents the twelve; the full sixteen is the larger picture.

A note on searching for it. “BL 61”, “UB 61” and “Pucan” searches return protocol trials and unrelated material matched on transliteration, and this point’s English name varies considerably between sources — Subservient Visitor, and several other renderings — which makes name-based searching unreliable. Our library codes this channel BL- while some sources use UB-. Any claim attached to this point should be checked against what a study actually used.

Source: Sacred Lotus sources & references (category, action, indication and location records; every Yang Motility designation and every Xi-Cleft designation queried and counted, and the BL-59, BL-62, BL-63, KI-08, KI-09 and GB-35 records confirmed, against our own data).