Can I fix a broken chip with glue? | Repairs were reported, but breakage remained a concern [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 "repairing a cracked chip with glue" 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

• Customers reported glue repairs, but the diary also records broken ceramic leaving a fragment inside the body.
• Mr. Okada's responses progressed from adhesive repairs to reinforcement intended to keep broken ceramic pieces connected.
• The current list includes ceramic models from these cases; the reinforcement surcharge belongs to June 2025.

If you see blood in your urine, even a small amount or for the first time, do not wait and see. See a urologist right away.

If you suddenly cannot urinate, or the device cannot be removed, do not try to fix it yourself. Go to a medical facility, including emergency care, immediately.

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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: broken chip repair

The OK Prostate Chip is a small device placed in the urethra (urine passage) to act on the prostate. Glue repairs described here concern cracks in the chip or resin (material used to form or coat parts) around its thread. They concern the device itself, including parts intended to sit inside the body. The entries describe customer repairs, Mr. Okada's tests, and later attempts to prevent broken ceramic sections from separating.

Glue repair addressed a crack where the long chip's thread emerged

In an entry published in May 2018, a customer reported a small crack where the thread emerged from a long chip. The customer had reinforced that area with superglue (an instant adhesive) and reported no trouble during subsequent use. The diary does not record how long that repair lasted.

Mr. Okada said the message inspired a proposal combining superglue with epoxy (a resin used here for bonding and reinforcement). He believed each material could offset the other's weakness, including superglue's poor resistance to impact. His proposed reinforcement had superglue between epoxy layers, intended to reduce brittleness.

(Source: ok-lab's diary, published May 2018)
https://ok-lab.hatenablog.com/entry/20180513/1526181573

Broken ceramic chip repair followed an impact against a toilet bowl

In an entry published in October 2019, a customer described a short ceramic chip shooting out during urination and striking the toilet bowl. It split in two, and the customer reported continued use without an apparent problem after a repair with Aron Alpha superglue. The diary does not record longer-term results for that repair.

Mr. Okada said the ceramic revision introduced that week was considerably stronger. He also said impact resistance depended on where the chip was struck, and acknowledged limited comparative testing. Mr. Okada suggested epoxy might bond ceramic more effectively than superglue, presenting it as a possibility.

(Source: ok-lab's diary, published October 2019)
https://ok-lab.hatenablog.com/entry/2019/10/05/141806

Broken chip repair held during Mr. Okada's limited ceramic test

In an entry published in April 2021, Mr. Okada discussed his modified ceramic chip (Sea Slug 3, modification 2). He had accidentally broken it against a hard object during production and reported a strong bond after an epoxy repair.

After about 2 days of continuous use, he said the repaired joint resisted a subsequent strength check. The diary does not record a longer follow-up for that repaired piece. Mr. Okada treated the result as support for epoxy bonding broken ceramic, drawing a comparison with repaired bowls.

(Source: ok-lab's diary, published April 2021)
https://ok-lab.hatenablog.com/entry/2021/04/10/125809

An earlier broken chip left a fragment inside the body

In an entry published in June 2025, Mr. Okada recalled an earlier case of a ceramic chip breaking inside the body. A complex-shaped tip from that chip (Sea Slug 2) remained in the bladder and proved difficult to retrieve. According to his account, a doctor eventually removed it successfully.

He suspected an unnoticed crack had been present, but did not establish that as the cause. The diary does not give the date of the original incident. Mr. Okada identified preventing detached fragments as the reason for pursuing a new reinforcement design.

(Source: ok-lab's diary, published June 2025)
https://ok-lab.hatenablog.com/entry/2025/06/07/122954

Broken chip prevention tests still produced fragments from the long ceramic model

In an entry published in June 2025, Mr. Okada described drop tests of short, semi-long twisted, and long ceramic prototypes. The test pieces had wire reinforcement but lacked the additional epoxy covering planned for the finished reinforcement. All 3 survived a drop of 1 meter onto a wooden floor.

At 1.5 meters, the short and semi-long pieces remained intact, while small fragments broke away from the long one. He wrote that the damaged long chip still appeared largely connected and felt almost unbroken. Mr. Okada suggested possible adhesive repair, but phrased continued use as a possibility.

(Source: ok-lab's diary, published June 2025)
https://ok-lab.hatenablog.com/entry/2025/06/07/122954

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The maker's answer to broken chip repair

Mr. Okada proposed adhesive repairs, then explored reinforcement intended to prevent broken pieces from separating.

Glue repair lost its apparent strength during the maker's boiling test

In an entry published in June 2018, Mr. Okada reported a strong bond between detached resin and glass using Aron superglue. That bond failed during boiling at 100 degrees, and he said the adhesive maker's website gave a limit of 80 degrees. He also found that roughened glass shed its resin more readily than smooth glass.

He therefore planned to move away from reliance on adhesive bonding toward a physical tie made from resin. The diary does not record longer-term results for either approach. Mr. Okada nevertheless proposed continued use after adhesive repair, with a change in disinfection approach.

(Source: ok-lab's diary, published June 2018)
https://ok-lab.hatenablog.com/entry/20180602/1527922643

Resin chip repair led to reinforcement requiring additional manufacturing time

In an entry published in February 2019, Mr. Okada said several customers had reported continued use after epoxy repairs. He believed the matching resin families would bond, and said OK Lab's own repair option was also limited to additional epoxy. After reconsidering his first reply, he developed a layered reinforcement using a less brittle resin alongside epoxy.

The diary does not record how long that reinforcement lasted. The extra work added about 5 days, so he said the charge for a reinforced thread attachment would rise slightly. Mr. Okada asked for feedback on the reinforcement's durability before committing to its sale.

(Source: ok-lab's diary, published February 2019)
https://ok-lab.hatenablog.com/entry/2019/02/02/153358

Broken chip prevention shifted toward wire reinforcement with a separate surcharge

In an entry published in June 2025, Mr. Okada abandoned a rubber-coating idea after a day because he thought it missed the underlying problem. He adopted reinforcement with shape-memory wire (flexible wire used here to support ceramic), reporting a strong bond with the ceramic. He found the 0.2 mm wire flexible enough to make manufacturing easier than expected.

Mr. Okada believed reinforced pieces would remain connected after cracking, while acknowledging that ceramic could still break. The reinforcement surcharge was ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04), tax excluded, above the regular ceramic-chip price, regardless of shape, as published in June 2025. Mr. Okada proposed the reinforcement to address the risk of a broken tip remaining inside the body.

(Source: ok-lab's diary, published June 2025)
https://ok-lab.hatenablog.com/entry/2025/06/07/122954

If you see blood in your urine, even a small amount or for the first time, do not wait and see. See a urologist right away.

If you suddenly cannot urinate, or the device cannot be removed, do not try to fix it yourself. Go to a medical facility, including emergency care, immediately.

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How broken chip repair changed over time

The diary does not say what the current state is.

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OK Prostate Chip products related to broken chip repair

The short ceramic chip and long curved ceramic chip appear in the current list and the October 2019 cases.

Products that appear in these entries

(Source: ok-lab's diary, published October 2019)
https://ok-lab.hatenablog.com/entry/2019/10/05/141806

Products the diary mentioned as alternatives

The diary names no alternative.

Historical names include the May 2018 long chip and the February 2019 custom resin chip. No matching product can be confirmed on the current list.

The April 2021 modified ceramic chip, earlier chip recalled in June 2025, and June 2025 reinforced prototypes are also historical builds. No matching product can be confirmed on the current list.

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Common worries about broken chip repair

The diary's repair replies depended on the material, thread attachment, and reported damage.

"Can broken chip repair include replacing the whole thread?"

In an entry published in February 2019, a customer asked about repair or replacement after the thread began separating. The customer particularly valued this difficult custom build and reported similar trouble with earlier connected parts. Mr. Okada suspected an inherent weakness in his resin products.

He said glass models allowed complete thread replacement, while threads set into resin during manufacture generally could not be replaced. He initially thought a remake might suffer the same failure; the diary does not record this customer's eventual result. His initial recommendation was adhesive repair, before he returned to the problem with a new reinforcement proposal.

(Source: ok-lab's diary, published February 2019)
https://ok-lab.hatenablog.com/entry/2019/02/02/153358

"Could heat shrink the thread on a broken chip?"

In an entry published in February 2019, a customer asked whether hot-water disinfection had shortened the thread. The customer thought repeated exposure had made it noticeably shorter.

Mr. Okada reported 15% shrinkage at 120 degrees in a pressure sterilizer (equipment used in his heat-disinfection test). He said his tests had not produced shrinkage during ordinary boiling at 100 degrees. Mr. Okada offered contact with a hotter pan surface as a possible explanation, but the diary does not confirm the cause.

(Source: ok-lab's diary, published February 2019)
https://ok-lab.hatenablog.com/entry/2019/02/02/153358

"Can a broken ceramic chip be replaced after repair fails?"

In an entry published in October 2019, a customer requested a replacement long curved ceramic chip after problems with its resin coating. The customer reported bleeding during use, then said the ceramic core broke while they were attempting an epoxy repair.

Mr. Okada doubted that the raised resin explained the bleeding, but could not judge the claimed ceramic defect himself. He said he would consult the ceramic maker, while acknowledging that he could not currently supply the requested replacement. His proposed resolution was a refund, whose completion the diary does not record.

(Source: ok-lab's diary, published October 2019)
https://ok-lab.hatenablog.com/entry/2019/10/05/141806

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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.