Will a sharper curve keep my chip in place? | It may also make removal harder [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 "strong curves and sharply bending shapes" 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

• Mr. Okada reports that sharper curves can improve stability, while also making passage and removal harder.
• His later designs address the problem through flexible connections and gentler curves.
• Standard chips remain listed, but the later custom designs have no confirmed current matches.

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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: a sharper chip curve

The OK Prostate Chip is a device placed in the urethra to act on the prostate.

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.

A chip curve is the bend in the device itself or in the connection between its sections. Across these entries, Mr. Okada explores curves intended to follow the urine passage near the prostate and improve retention (staying in position). The examples include fixed curved tips, bendable metal cores, and flexible connections joining a prostate section to another section farther along the urethra.

An early anchoring chip curve raised concern after a tester reported bleeding

In an entry published in January 2018, Mr. Okada described a connected design with a sharply curved tip intended for bladder anchoring. He reported that anchoring remained uncertain and that a tester had experienced bleeding.

The tester reportedly said the bleeding had settled by the next urination. Mr. Okada deferred a sales decision for this design pending further testing. He cautioned that its curved tip could place excessive strain on the surrounding passage.

(Source: ok-lab's diary, published January 2018)
https://ok-lab.hatenablog.com/entry/20180111/1515662782

An extreme custom chip curve remained untested by the maker

In an entry published in August 2018, a customer requested an unusually curved custom chip. Mr. Okada reported making it, while expressing concern about the large tip curve.

The diary does not record the outcome. Mr. Okada cautioned that he was supplying the requested shape without testing it himself.

(Source: ok-lab's diary, published August 2018)
https://ok-lab.hatenablog.com/entry/20180811/1533969999

A bendable chip curve improved reported stability but raised removal concerns

In an entry published in June 2023, Mr. Okada introduced a metal-core bead chip with adjustable curvature. He reported that a strong curve resisted movement during urination in his own tests. He also described versions bending in different directions, rather than one permanently fixed shape.

The published price for the version with three beads was ¥5,000 (about $32 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Mr. Okada warned that a strongly curved chip reaching the bladder might require hospital removal.

(Source: ok-lab's diary, published June 2023)
https://ok-lab.hatenablog.com/entry/2023/06/24/123110

An elastic chip curve did not prevent the ceramic prototype from slipping

In an entry published in March 2024, Mr. Okada tested ceramic sections joined by elastic wire. He reported unexpected movement toward the bladder, despite initially intending a shallower position.

A later entry that month recorded the same design suddenly slipping toward the urethral opening after about a day. He attributed this to the ceramic's slipperiness and the connection becoming straight. Mr. Okada consequently expressed reservations about recommending this ceramic arrangement.

(Source: ok-lab's diary, published March 2024)
https://ok-lab.hatenablog.com/entry/2024/03/16/123023

(Source: ok-lab's diary, published March 2024)
https://ok-lab.hatenablog.com/entry/2024/03/23/122837

A customizable chip curve answered requests for thinner and longer designs

In an entry published in December 2025, Mr. Okada revisited requests for thinner, longer chips with individually chosen dimensions. His proposed resin-coated wire design allowed changes to length, width, and curve angle. The published angle choices were 60 or 90 degrees, with a base price of ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04) excluding tax before added chip sections.

He described the covered flexible version as able to change shape under force. Mr. Okada cautioned that the version without a tube cover could not accommodate the same extreme length or curvature.

(Source: ok-lab's diary, published December 2025)
https://ok-lab.hatenablog.com/entry/2025/12/27/122915

A future ceramic chip curve remained a prototype without planned sales

In an entry published in February 2026, Mr. Okada described a ceramic prototype with a 150-degree connection. Its structure included doubled 0.3 mm wire and doubled 0.24 mm nylon thread.

He intended the stronger curve to resist movement in either direction and reported a favorable personal impression. Mr. Okada explicitly said that sales were not planned at that publication date.

(Source: ok-lab's diary, published February 2026)
https://ok-lab.hatenablog.com/entry/2026/02/28/122912

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The maker's answer to a sharper chip curve

Mr. Okada's responses consider flexibility, connection strength, and individual fit alongside the curve's angle.

A gentler chip curve followed advice about strain on the prostate

In an entry published in November 2019, Mr. Okada reconsidered a connected ceramic design after consulting someone he described as a urethral specialist. He initially questioned the objection to its strong curve, then accepted the concern about strain on the prostate.

He made the curve gentler and retained closely spaced and more separated versions. Regular sales remained on hold while the design was available only by custom request. Mr. Okada advised against treating the stronger curve's resistance to slipping as its only relevant feature.

(Source: ok-lab's diary, published November 2019)
https://ok-lab.hatenablog.com/entry/2019/11/02/132358

A reduced chip curve addressed reported failures in rubber connections

In an entry published in December 2023, Mr. Okada reported breakage in sharply angled rubber connections between ceramic chips. He said recent builds therefore used gentler angles.

In January 2026, he explained that the older connection was now limited to about 45 degrees, following earlier attempts around 60 degrees. He proposed a joint using nitinol (a nickel-and-titanium alloy that returns toward a remembered shape) for a 90-degree version. The published added charge was ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04) excluding tax, including reinforcement. Mr. Okada made that reinforcement standard for the revised connection.

(Source: ok-lab's diary, published December 2023)
https://ok-lab.hatenablog.com/entry/2023/12/30/122243

(Source: ok-lab's diary, published January 2026)
https://ok-lab.hatenablog.com/entry/2026/01/31/122917

Finished chip curve measurements depended on the wire's thickness

In an entry published in February 2025, Mr. Okada announced intended finished angles of approximately 75, 90, 105, and 130 degrees. These concerned a loop-based design made with factory-curved wire inside tubing.

In March 2025, he reported that the strongest 0.4 mm version actually remained around 150 degrees in the completed device. The 0.3 mm versions were within his expected range. Mr. Okada suggested the thinner wire for beginners because he considered the thicker wire's pressure stronger.

(Source: ok-lab's diary, published February 2025)
https://ok-lab.hatenablog.com/entry/2025/02/22/122939

(Source: ok-lab's diary, published March 2025)
https://ok-lab.hatenablog.com/entry/2025/03/01/122825

A more flexible chip curve reduced stiffness and the maker's reported sensation

In an entry published in February 2026, customer feedback led Mr. Okada to revise a jointed chip (a chip with a flexible connection). He reported that the existing joint could still make passage and removal difficult. The revised connection required less force to bend.

The photographed bend reached 180 degrees, while the standard resting angle (the angle without an outside force) was about 45 degrees. A longer version had a 30 mm gap and a resting angle around 30 degrees. Mr. Okada cautioned that the easier bending also reduced the spring pressure and sensation he associated with the joint.

(Source: ok-lab's diary, published February 2026)
https://ok-lab.hatenablog.com/entry/2026/02/07/122919

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 a sharper chip curve changed over time

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OK Prostate Chip products related to a sharper chip curve

The current list includes standard chips discussed in the customer accounts below.

Products that appear in these entries

(Source: ok-lab's diary, published May 2019)
https://ok-lab.hatenablog.com/entry/2019/05/25/144939

(Source: ok-lab's diary, published May 2021)
https://ok-lab.hatenablog.com/entry/2021/05/01/130245

Products the diary mentioned as alternatives

The diary names no alternative.

Custom builds and prototypes described above:

No matching product can be confirmed on the current list.

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Common worries about a sharper chip curve

The reader questions concern slipping, rigidity, and the limits of custom dimensions.

"Will a sharper chip curve stop my chip slipping out?"

In an entry published in May 2019, a customer using the strongly curved chip asked to compare stronger and weaker curves. Mr. Okada replied that the earlier bow-shaped custom design had almost the same curvature as the customer's existing model.

He could not identify the cause of slipping and suggested that length might also matter. The diary does not record the outcome. Mr. Okada warned that an extreme curve could make a chip impossible to remove.

(Source: ok-lab's diary, published May 2019)
https://ok-lab.hatenablog.com/entry/2019/05/25/144939

"Could a fixed chip curve work better than flexible connections?"

In an entry published in May 2021, a customer reported comfortable positioning with the twisted semi-long ceramic chip. The customer then asked about a rigid, pre-curved stainless-steel ring design.

Mr. Okada said a fixed curved connection was conceivable, then proposed a wire-core connection that retained some flexibility. The diary does not record the outcome. Mr. Okada favored that flexibility as the more practical approach.

(Source: ok-lab's diary, published May 2021)
https://ok-lab.hatenablog.com/entry/2021/05/01/130245

"Can a curved chip be made as long as requested?"

In an entry published in June 2025, a customer requested a 30 cm curved wire assembly with a 120-degree bend. OK Lab staff explained that the available curved wire left about 14 cm on either side of the bend. Staff proposed an extension, which the customer accepted while requesting a particular connection position.

The diary does not record the outcome. Mr. Okada explained that a longer assembly required an added end section because the factory-curved wire limited the available length.

(Source: ok-lab's diary, published June 2025)
https://ok-lab.hatenablog.com/entry/2025/06/21/122934

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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 (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.