Will my homemade chip's thread stay attached? | The diary records problems and partial fixes [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 (Okada Comfortable Life Laboratory). Only the entries about "DIY prostate chip thread attachment" 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

• OK Lab, a small company in Japan, records concerns about exposed knots, loose thread connections, and peeling resin.
• Mr. Okada reported that loops addressed detachment, while resin peeling remained unresolved in May 2018.
• The current list includes related products, but it does not confirm the historical thread-free custom options.

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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: DIY prostate chip thread attachment

The OK Prostate Chip is a small device placed in the urethra, the urine passage. The retrieval thread (the cord attached for removal) connects to the chip, as discussed in October 2017. These entries examine knots, loops, and resin (material for chip bodies and coatings) around connections on homemade chips and factory products. The recurring concerns are whether that connection holds and whether exposed or rough parts affect the urethral lining.

Exposed knots complicated DIY chip thread attachment from the start

In an entry published in October 2017, Mr. Okada considered a thread connection anchored through a hole in resin workable. He also discussed an attachment at a narrowed part of the chip, but worried that an exposed knot could irritate the urethral lining.

An earlier glass prototype had silicone (a coating material) over its knot, intended to limit irritation. Mr. Okada also linked removal by the thread under dry conditions with greater force, friction, and injury to the urethral wall. He therefore expressed doubts about prolonged placement.

(Source: ok-lab's diary, published October 2017)
https://ok-lab.hatenablog.com/entry/20171016/1508121237

Peeling resin left a glass chip's retrieval thread connection in doubt

In an entry published in May 2018, a customer asked whether a semi-long glass chip remained usable after its first use. The customer saw a gap between the glass and the resin at the thread attachment, and worried about detachment. This was a report of resin separation; the customer did not report that the thread had completely detached.

Mr. Okada replied that he believed the loop connection (a design intended to prevent complete thread detachment) had addressed detachment. He explicitly said the resin-peeling problem remained unresolved, with surface-treatment tests still underway. His answer to this customer was a request to return the product for a refund.

(Source: ok-lab's diary, published May 2018)
https://ok-lab.hatenablog.com/entry/20180524/1527153380

An internal retrieval thread did not settle the foil prototype's concerns

In an entry published in March 2019, Mr. Okada described an aluminum-foil test chip with its thread connection inside the body. Its shape resembled a semi-long chip, with resin covering the pointed ends. He reported a day of personal testing without a problem.

The diary does not record longer-term results for that test chip. Mr. Okada wrote that water could enter its interior and that bacterial growth might become a problem over time. His account therefore included a caution about prolonged use, despite his favorable initial impression.

(Source: ok-lab's diary, published March 2019)
https://ok-lab.hatenablog.com/entry/2019/03/09/150813

Deteriorating chip thread prompted a customer's homemade titanium design

In an entry published in May 2022, a customer described trying a homemade titanium chip after an existing chip's thread deteriorated. The older chip was a flat-faced, curved semi-long model, identified as size L. The customer wanted a design using nylon fishing line because the thread would eventually deteriorate.

The finished titanium chip had a 2 mm thread hole, and the customer reported a favorable personal experience. The diary does not record how long the nylon thread lasted. Mr. Okada praised the workmanship; his reply did not provide a specific thread-attachment recommendation.

(Source: ok-lab's diary, published May 2022)
https://ok-lab.hatenablog.com/entry/2022/05/07/123013

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The maker's answer to DIY prostate chip thread attachment

The diary records design changes, return offers, and experiments, with some attachment problems still unresolved.

The loop connection changed chip thread attachment shipments in May 2018

In an entry published in May 2018, Mr. Okada announced that loop-connected products would ship from May 24, 2018. The packaging changed too, so these shipments could be distinguished from products with the earlier non-loop connection.

He warned that a large number of requests could delay conversion work. Alongside the change to new shipments, Mr. Okada offered owners conversion of their earlier non-loop connections.

(Source: ok-lab's diary, published May 2018)
https://ok-lab.hatenablog.com/entry/20180524/1527153380

Earlier chip thread detachment reports led to a dated refund offer

In the same May 2018 entry, Mr. Okada described a decision on May 10, 2018, to suspend sales of some products. The decision followed reports of thread detachment. He then addressed products shipped without the countermeasure from May 10 through May 23, 2018.

He said free thread replacement would ordinarily be appropriate, but numerous requests could exceed his capacity. The passage does not record how many customers accepted the offer or received refunds. For affected customers who wanted a remedy, Mr. Okada offered return and refund treatment for defective goods.

(Source: ok-lab's diary, published May 2018)
https://ok-lab.hatenablog.com/entry/20180524/1527153380

A contributor's chip thread experiment prompted further resin-bonding tests

A separate contributor in the May 2018 entry proposed an attachment design with a covered knot and nylon fishing line. The contributor worked with adhesives professionally and wanted the knot kept away from contact with the body. The diary also records that this person tried an attachment on the resin trial chip.

Mr. Okada's response focused on whether the glass surface and resin could form a stronger bond. He wrote that testing had begun, but did not report a successful resolution of resin peeling. He asked readers to allow more time for those tests.

(Source: ok-lab's diary, published May 2018)
https://ok-lab.hatenablog.com/entry/20180524/1527153380

A titanium chip's retrieval thread loosened despite its doubled line

In an entry published in March 2021, Mr. Okada received homemade titanium chips, including one with doubled nylon line. He wrote that the nylon's tendency to spring back made this connection prone to loosening. His first response involved a 6-hole stopper (a separate component intended here to hold the connection).

He then described a different attachment using OK Lab's thread, partly to cover rough projections reported inside the thread hole. Testing in use was still planned, so the passage does not establish a result for that revised attachment. Mr. Okada said any request for further production would depend on testing and a favorable experience.

(Source: ok-lab's diary, published March 2021)
https://ok-lab.hatenablog.com/entry/2021/03/13/130202

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How DIY prostate chip thread attachment changed over time

The diary does not say what the current state is.

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OK Prostate Chip products related to DIY prostate chip thread attachment

The current list includes products involved in these reports, without confirming the old experimental attachments or custom options.

Products that appear in these entries

(Source: ok-lab's diary, published May 2018)
https://ok-lab.hatenablog.com/entry/20180524/1527153380

(Source: ok-lab's diary, published March 2021)
https://ok-lab.hatenablog.com/entry/2021/03/13/130202

Products the diary mentioned as alternatives

The diary names no alternative.

The diary also describes an early glass prototype in October 2017 and an aluminum-foil test chip in March 2019. No matching product can be confirmed on the current list.

The June 2019 thread-free custom builds and the older curved chip identified as size L in May 2022 also appear here. No matching product can be confirmed on the current list.

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Common worries about DIY prostate chip thread attachment

The June 2019 correspondence separates ceramic hole finish, thread-free supply, and the price of a custom resin chip.

"Could a ceramic chip come without an embedded retrieval thread?"

In an entry published in June 2019, a customer worried about thread breakage and asked about a ceramic chip with a hole only. Mr. Okada said a chip without an embedded thread could be supplied. His initial reply distinguished leaving out the thread from leaving the hole's surface unfinished.

The hole was fired without glaze (the ceramic surface finish). The diary does not record whether that ceramic order was completed. Mr. Okada initially said the unfinished hole would still need resin coating, even without a thread.

(Source: ok-lab's diary, published June 2019)
https://ok-lab.hatenablog.com/entry/2019/06/01/155432

"Why was the ceramic chip's retrieval thread hole left rough?"

In the June 2019 follow-up, the same customer asked why the ceramic hole lacked glaze. Mr. Okada explained that the hole served as a support point during firing. Leaving that area unglazed allowed firing without the glazed body sticking to kiln surfaces, he wrote.

He described the unfinished area as dull and rough, like the underside of a ceramic bowl. The diary does not record how the customer's proposed finish performed. Mr. Okada offered the unfinished version if the customer accepted that surface condition.

(Source: ok-lab's diary, published June 2019)
https://ok-lab.hatenablog.com/entry/2019/06/01/155432

"What did a resin screw without its retrieval thread cost?"

The same customer also asked in June 2019 about a separate thread-free resin screw chip before the ceramic purchase. The requested dimensions were 35 mm long and 10 mm wide, with a screw shape. Mr. Okada quoted ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04) excluding tax, because the ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax thread-embedding charge would not apply.

The diary does not record whether that resin order was completed or how it felt in use. For the ceramic custom work discussed alongside it, he described a minimum wait of about 5 weeks. Mr. Okada asked for understanding about ceramic production delays; the thread-free resin quote was a historical custom price.

(Source: ok-lab's diary, published June 2019)
https://ok-lab.hatenablog.com/entry/2019/06/01/155432

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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.