From the perspective of traditional Chinese medicine, "dredging collaterals" has two specific meanings: one is to dredge rheumatism paralysis, and the other is to dredge qi and blood stasis.

1 dispel wind and remove dampness, relax tendons and activate collaterals;

Radix Clematidis (dredging meridian, expelling wind and removing dampness, removing arthralgia), Notopterygii Rhizoma (except upper limb rheumatism paralysis), Radix Angelicae Pubescentis (except lower limb rheumatism paralysis), Radix Aconiti (dispelling cold and removing dampness, dredging arthralgia), Ramulus Cinnamomi and Cortex Cinnamomi (dredging meridian yang, dispersing meridian cold, dredging meridian).

2 dredge meridian qi and blood stasis

Chuanxiong rhizome (promoting blood circulation and dredging collaterals, treating blood stasis and blocking collaterals, or stagnation of blood due to cold), Curcuma aromatica (promoting qi circulation and relieving depression, dredging qi stagnation and blocking collaterals), Olibanum, Myrrha, Lamiophlomis rotata, Notoginseng Radix (dredging collaterals and relieving pain, promoting blood circulation of injured parts and accelerating repair), peach kernel and safflower (promoting blood circulation and removing stasis, dredging collaterals).

I don't know if this is what you want:-)