Urine leaks or sprays around a chip accessory? | Collection devices had limits [OK Prostate Chip]

This page is based on entries from "ok-lab's diary" (https://ok-lab.hatenablog.com/), the Japanese development diary written by Mr. Okada, founder of OK Lab, a small company in Japan (Okada Comfortable Life Laboratory). Only the entries about "urination and urine collection accessories" are summarized here, in order of publication. Past prices and sizes are as written at the time. Current prices come from the official product list (retrieved September 4, 2026). Quotations are translated from Japanese.

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Note: This page is a personal reading log by someone with no connection to the maker or the seller. It reflects the source entries as of their publication dates and makes no guarantee of accuracy or safety. The product is not a medical device; talk to a doctor about any health decision. Check the official site for current information. This page contains advertising.

In short

• The diary records unpredictable spraying, leftover drips, and leaks around experimental urine collection accessories.
• Mr. Okada tried external tubes, stoppers, stronger outlets, and rings, while reporting important limitations.
• Today's list includes the penis diaper wrap, three-piece flattening set, and sliding-lock retaining ring.

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About this product

The OK Prostate Chip is a small device that is placed in the urethra (the urine passage) so that it acts on the prostate; the maker sells it in several shapes, sizes and materials. It is made and sold by OK Lab (Okada Comfortable Life Laboratory), a small company in Japan, through its own online store, and prices are in Japanese yen (JPY). The maker's development diary, "ok-lab's diary", is written in Japanese. This page is an English summary of it, and every quotation is translated. OK Lab ships internationally, so readers outside Japan can order (see "Buying from outside Japan" below). Product names on this page are plain-English descriptions. The official Japanese product name is shown once in the product table so you can find the same item in the store.

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Before you read: key terms

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What happens: urine leaks and spraying

The OK Prostate Chip is a device placed in the urethra to stimulate the prostate, as Mr. Okada describes it. These entries also discuss accessories that collect or redirect urine around a penis held inward by a flattening set. A condom serves as a collection sheath over the penis, with an outlet leading to a tube outside the body. Other experiments concern a stopper at that tube's end and a retaining ring around the urine opening.

One penis diaper wrap user reported weaker flow without urine leaks

In an entry published in September 2022, a customer described wearing the penis diaper wrap throughout the year. The customer reported that it weakened the urine stream enough to prevent leakage from an adult diaper. The message accompanied a purchase request for a three-pack priced at ¥940 (about $6 at ¥156 = $1, rate as of 2026-09-04).

Mr. Okada replied to a separate concern in the message, without assessing the reported change in urine flow. The diary does not record whether that new order was completed.

(Source: ok-lab's diary, published September 2022)
https://ok-lab.hatenablog.com/entry/2022/09/24/122837

A perforated flattening plate left urine spraying in unpredictable directions

In an entry published in April 2023, Mr. Okada described a problem with the older perforated plate against the penis tip. Urine could emerge from different holes and travel in unexpected directions, potentially dirtying the toilet or floor. He also reported urine running over the testicles, leaving a wide area needing washing afterward. His immediate development goal was more manageable urination while the penis remained held inward.

(Source: ok-lab's diary, published April 2023)
https://ok-lab.hatenablog.com/entry/2023/04/01/122841

An external urine collection tube worked better without the urethral sound

In an entry published in April 2023, Mr. Okada described testing a urethral sound (a rod inside the urine passage) alongside a collection sheath. The sound crowded the plate's central opening and interfered with urine flowing outward. In his test without the sound, an external tube received the urine instead.

He reported that urine no longer ran over his testicles and that washing after urination was unnecessary in that trial. He cautioned that testing had lasted only a few days and that the fastening arrangements might change.

(Source: ok-lab's diary, published April 2023)
https://ok-lab.hatenablog.com/entry/2023/04/01/122841

A urine stopper addressed drips remaining inside the external tube

In an entry published in April 2023, Mr. Okada reported a remaining problem after urine reached the external collection tube. Some urine stayed inside despite his attempts to empty it, then escaped later when something disturbed the tube. His response was a urine stopper, a cap at the tube's outlet.

In a separate discussion within that entry, he suggested this approach might also address small leaks after urination. The diary does not record whether that proposal was tested by a customer.

(Source: ok-lab's diary, published April 2023)
https://ok-lab.hatenablog.com/entry/2023/04/01/122841

A loose collection ring allowed urine leaks and backward flow

In an entry published in April 2023, Mr. Okada described leakage around the ring securing the collection sheath near the penis tip. He wrote that a large urine flow could exceed the tube's capacity when the ring was too loose. The sheath could then swell and urine could flow backward. He also cautioned that the ring might slip when the penis tip lacked a pronounced retaining edge.

(Source: ok-lab's diary, published April 2023)
https://ok-lab.hatenablog.com/entry/2023/04/08/122508

A sealed urine collection prototype produced an unexpected suction claim

In an entry published in April 2023, Mr. Okada described suction in his collection-compatible sound prototype. He attributed it to the external tube's restoring force within a sealed system. Its original purpose was to clear urine remaining in the collection sheath.

He reported that it also drew out urine remaining in the bulbar urethra (a section of the urine passage). His further suggestion that suction reached the prostate area was based on how it felt. He stated that the testing period was still short.

(Source: ok-lab's diary, published April 2023)
https://ok-lab.hatenablog.com/entry/2023/04/15/123038

Abandoning film attachment led to an experimental urine-direction ring

In an entry published in October 2023, Mr. Okada reported abandoning film attachment for an experimental plate-style belt. He wrote that changes in the penis tip and skin renewal caused the film to peel away quickly.

His next proposal was an elongated urine-direction ring surrounding the urine opening. He reported that supporting the opening's shape seemed to produce a straighter stream in the desired direction. The planned ring was about 50mm long, extending beyond the plate opening.

(Source: ok-lab's diary, published October 2023)
https://ok-lab.hatenablog.com/entry/2023/10/07/123003

Side attachment gave the retaining ring more control over urine direction

In an entry published in October 2023, Mr. Okada reported more movement after changing the retaining ring's attachment to the sides. He wrote that the urine opening could move about 2cm, allowing the direction of urination to change. His related trial used a plain 4mm tube, without an internal cable.

He described a 16-part brush-like tip intended to soften contact around a 90-degree bend in the urine passage. The diary describes this as his own experiment with the sliding-lock holder.

(Source: ok-lab's diary, published October 2023)
https://ok-lab.hatenablog.com/entry/2023/10/28/122832

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The maker's answer to urine leaks and spraying

Mr. Okada separated collection, sealing, and overflow problems, and discouraged the complicated collection-compatible sound for ordinary customers.

Urine collection fastenings came with warnings about circulation and skin

In an entry published in April 2023, Mr. Okada warned that tight rubber bands around the penis could stop circulation and cause tissue death. His experiment used silicone tubing with an outside diameter of 1mm for the fastening. He attributed the gentler pressure in his test to that material.

His warning concerned the rim of the penis tip, where trapped skin could develop blisters. Mr. Okada cautioned against rubber bands on the penis and against catching the surrounding skin in a fastening.

(Source: ok-lab's diary, published April 2023)
https://ok-lab.hatenablog.com/entry/2023/04/01/122841

Split-end urine collection tubes and adjustable rings had separate prices

In an entry published in April 2023, the two-ring silicone set cost ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) excluding tax. The split-end collection tube, including its stopper, also cost ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) excluding tax. The rings used doubled silicone tubing and a sliding bead for adjustment.

The collector combined tubing with 8mm outside/6mm inside diameters and tubing with 6mm outside/4mm inside diameters. Mr. Okada described eight separated tips intended to preserve openings for urine under pressure from the plate. He offered separate quotations for larger rings or longer tubes.

(Source: ok-lab's diary, published April 2023)
https://ok-lab.hatenablog.com/entry/2023/04/08/122508

Urine collection complications led Mr. Okada to recommend an ordinary sound

In an entry published in April 2023, Mr. Okada reported that a soft tube and sheath alone had not provided reliable sealing. His revised prototype placed a reinforced outlet beside the sound, with both enclosed in an elastic coating. He described this structure as resisting the collapse that had obstructed urine flow.

Nevertheless, fitting the collection-compatible design took even him about 10 minutes. He did not generally recommend it, although he offered it to people specifically seeking extended wear and urine collection. Mr. Okada instead recommended the ordinary silicone-and-metal sound without the experimental collection structure.

(Source: ok-lab's diary, published April 2023)
https://ok-lab.hatenablog.com/entry/2023/04/15/123038

A capped urine collection tube could still leak during heavier flow

In an entry published in April 2023, Mr. Okada distinguished small leaks from a large release of urine. He wrote that the cap could contain small amounts, but a large flow with the cap closed could overinflate the sheath. Urine could then leak toward the inward-held penis.

His report therefore included a limit to the sealed collector's claimed performance. Mr. Okada suggested that an adult diaper might also be needed where substantial leakage was possible.

(Source: ok-lab's diary, published April 2023)
https://ok-lab.hatenablog.com/entry/2023/04/15/123038

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How urine leaks and spraying changed over time

The diary does not say what the current state is.

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OK Prostate Chip products related to urine leaks and spraying

The current list includes the penis diaper wrap, three-piece flattening set, and sliding-lock retaining ring.

Products that appear in these entries

The penis diaper wrap three-pack is sold through OK Lab's own online store.

The three-piece flattening set is sold through OK Lab's own online store.

The sliding-lock urethral retaining ring is sold through OK Lab's own online store.

(Source: ok-lab's diary, published September 2022)
https://ok-lab.hatenablog.com/entry/2022/09/24/122837

(Source: ok-lab's diary, published April 2023)
https://ok-lab.hatenablog.com/entry/2023/04/08/122508

(Source: ok-lab's diary, published October 2023)
https://ok-lab.hatenablog.com/entry/2023/10/28/122832

Products the diary mentioned as alternatives

The diary names no alternative.

The entries also describe collection rings, a split-end tube, a urine stopper, both sound versions, and an experimental plate-belt ring. No matching product can be confirmed on the current list.

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Common worries about urine leaks and spraying

"When would the plate belt with its urine-direction ring go on sale?"

In an entry published in October 2023, readers asked when the experimental plate-style belt would become available. Mr. Okada replied that the belt and plate structure was complete, but the way to prevent the penis tip protruding remained unsettled. He said further testing and checks were needed before sales could begin.

The diary does not record a launch date for that prototype in this material. Mr. Okada cautioned that it would not reach sale as quickly as those inquiries anticipated.

(Source: ok-lab's diary, published October 2023)
https://ok-lab.hatenablog.com/entry/2023/10/07/123003

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Buying from outside Japan

OK Lab ships internationally to countries covered by Japan Post's EMS courier service. Overseas orders are paid in advance by PayPal. Each order carries a ¥400 (about $3 at ¥156 = $1, rate as of 2026-09-04) handling fee, and EMS shipping is charged on top. These terms come from OK Lab's official sales-terms page (written here as plain text, not a link: ok-lab.net/docs/law), checked on September 7, 2026; confirm them on the official store before you order, because they can change.

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Summary of this article

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Source: ok-lab's diary (Okada Comfortable Life Laboratory). The original entries are in Japanese; quotations on this page are translated. Photos and videos are on the original entries.