Could my chip slip into the bladder? | Shape cannot guarantee prevention [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 entries about designs intended to reduce bladder migration 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

• Enlarged ends and curved connections did not prevent every reported case of a chip entering the bladder.
• Mr. Okada explored larger stops, stiffer links, and loops, while acknowledging limits and retrieval risks.
• His August 2026 preference for an adjustable loop remained theoretical, without a recorded customer result.

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: chip slipping into the bladder

The OK Prostate Chip is a small device placed in the urethra to act on the prostate. Bladder migration (movement inward into the bladder) is the problem described in these customer reports. The diary explores enlarged rear ends, curved connections, and loops intended to keep the device near the prostate. These features sit on or behind the chip, near the sphincter (muscle that grips it), with the aim of resisting further inward movement.

A larger rear end avoided bladder migration but bleeding occurred

In an entry published in March 2022, a customer reported 2 uses of a pointed custom chip without bladder migration. However, it sometimes moved outward, and both uses involved pain and bleeding near the pointed end.

The customer wanted a longer version and asked about enlarging another resin design. Mr. Okada said custom enlargement was possible, while acknowledging concerns about combining the materials. He warned that the pointed design was dangerous and said future versions should have a softer tip.

(Source: ok-lab's diary, published March 2022)
https://ok-lab.hatenablog.com/entry/2022/03/05/123200

An enlarged custom end prevented bladder migration during three reported uses

In an entry published in April 2022, a customer reported 3 uses of a long resin chip with an enlarged rear end. They described stable positioning, without either bladder migration or movement back toward the urethral opening. Mr. Okada thought the enlargement might explain that result. He cautioned that the same large shape could make retrieval harder if it entered the bladder.

(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/02/123050

Strong curves may resist bladder migration while making retrieval harder

In an entry published in June 2023, Mr. Okada described trials of a beaded-wire chip with a pronounced curve. At approximately 90 degrees to 110 degrees, he reported almost no movement during urination. He thought the shape might also resist complete passage into the bladder. However, he warned that a forcibly displaced chip might resist thread retrieval and natural expulsion, potentially requiring hospital treatment.

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

A standard stopper failed to prevent bladder migration requiring hospital removal

In an entry published in March 2024, a customer reported bladder migration involving an L long ceramic four-point twist chip, approximately 60mm long. Its L six-hole stopper also entered the bladder, and a clinic removed the assembly with an endoscope (an internal viewing instrument). The customer then asked whether a custom stopper was necessary.

Mr. Okada said a standard L stopper would offer little resistance for someone able to accommodate a 15mm screw-shaped piece. The diary does not record a later custom-stopper result for this customer. Mr. Okada offered a larger custom stopper and suggested that a larger auxiliary chip (an extra chip behind the main device) might help.

(Source: ok-lab's diary, published March 2024)
https://ok-lab.hatenablog.com/entry/2024/03/02/123027

Bladder migration left broken ceramic inside until hospital treatment succeeded

A separate entry published in March 2024 described a ceramic chip that had broken in half, leaving a piece inside the bladder. A university hospital reportedly judged removal with grasping instruments impossible and considered a special operation or open abdominal surgery. The entry ultimately records successful removal, without identifying the final method. Mr. Okada cautioned that the retrieval tools he had improvised did not appear safe.

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

Long curved chips raised bladder migration concerns for fully internal wear

In an entry published in August 2024, a customer asked about a fully internal version of the long curved version 5 chip. Mr. Okada advised against that arrangement. He said development work had shown that its long arc could keep advancing once sufficiently deep inside the bladder. He instead favored a loop-shaped rear connection, while explaining that the S-shaped design reversed the front curve to address this concern.

(Source: ok-lab's diary, published August 2024)
https://ok-lab.hatenablog.com/entry/2024/08/17/122842

Bladder migration carried a wire-loop device and its thread inside

In an entry published in May 2025, a customer could no longer retrieve a wire-loop device. OK Lab initially answered on the assumption that it remained in its expected position. When further messages revealed that the attached thread had also disappeared, the company advised urological care.

The customer reported CT (a hospital scan), urine testing, and removal with a bladder scope (an internal viewing instrument). The visit took about 5 hours, including waiting, and cost ¥34,000 (about $218 at ¥156 = $1, rate as of 2026-09-04). Mr. Okada warned that shape-memory wire (wire that returns toward a set shape) could deform under force and travel beyond its intended position.

(Source: ok-lab's diary, published May 2025)
https://ok-lab.hatenablog.com/entry/2025/05/03/122907

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The maker's answer to chip slipping into the bladder

Mr. Okada proposed resistance through shape, but his accounts also identify discomfort, retrieval difficulties, and uncertain results.

Enlarged ends and deep grooves became an early bladder migration proposal

In an entry published in May 2018, a customer requested a glass chip with more pronounced bumps and grooves. One prototype measured 41mm, with an 11mm prostate-side bump and a 12mm rear bump. Mr. Okada thought an enlarged terminal section and deep grooves might resist the whole device crossing the sphincter. He nevertheless described an additional stopper as his preferred measure against inward movement.

(Source: ok-lab's diary, published May 2018)
https://ok-lab.hatenablog.com/entry/20180505/1525509161

Stiffer connections addressed bladder migration but introduced discomfort and durability concerns

In an entry published in January 2021, Mr. Okada described a steel-wire connection spanning 3cm between chips. He thought its resistance to folding would prevent the collapse associated with thread-linked devices entering the bladder. However, his bladder-directed prototype still shifted during urination, leaving a ring painfully caught at the inner sphincter.

A parallel nylon thread was included because the wire could eventually break. Mr. Okada cautioned that long-term durability remained unknown.

(Source: ok-lab's diary, published January 2021)
https://ok-lab.hatenablog.com/entry/2021/01/23/130107

An enlarged titanium end was proposed for repeated bladder migration

In an entry published in August 2021, a customer wanted an alternative after small chips failed to stay in position. Mr. Okada admitted that he could not confidently explain the reported inward movement. He proposed a 44mm titanium twist chip whose enlarged rear end might resist crossing the sphincter.

No subsequent experience with that proposal is recorded in the entry. Mr. Okada cautioned that an external stopper might be the only effective option if additional internal pieces also kept moving inward.

(Source: ok-lab's diary, published August 2021)
https://ok-lab.hatenablog.com/entry/2021/08/07/125807

An S-shaped design sought to limit bladder migration through opposing curves

In an entry published in May 2024, Mr. Okada described an S-shaped device with its bladder section curved toward the back. He believed contact with the bladder wall limited further inward travel, while the hooked shape resisted outward movement. Shape-memory connections allowed the sections to return toward their intended curves.

The published standard price was ¥13,000 (about $83 at ¥156 = $1, rate as of 2026-09-04) excluding tax, covering three chips, their connection, and a tube cover. Mr. Okada recommended the cover because he considered exposed wire uncomfortable around the inner sphincter.

(Source: ok-lab's diary, published May 2024)
https://ok-lab.hatenablog.com/entry/2024/05/18/122913

A dedicated front loop led Mr. Okada to rule out bladder migration

In an entry published in March 2025, Mr. Okada discussed a wire-loop device with an additional bladder loop. He claimed that the front loop provided a stopping point and that a length approaching 20cm physically ruled out bladder migration. The paragraph does not record a customer outcome demonstrating that claim. For people worried about inward movement, he proposed this particular configuration while acknowledging that other wire-loop arrangements could still enter the bladder.

(Source: ok-lab's diary, published March 2025)
https://ok-lab.hatenablog.com/entry/2025/03/29/122912

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 chip slipping into the bladder changed over time

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OK Prostate Chip products related to chip slipping into the bladder

The current list includes products discussed in customer reports, including devices involved in problems.

Products that appear in these entries

(Source: ok-lab's diary, published January 2021)
https://ok-lab.hatenablog.com/entry/2021/01/23/130107

(Source: ok-lab's diary, published March 2024)
https://ok-lab.hatenablog.com/entry/2024/03/02/123027

Products the diary mentioned as alternatives

The diary names no alternative.

Custom glass, enlarged-end resin and steel-wire builds; pointed resin, titanium twist, beaded-wire, S-shaped and long curved version 5 designs; wire-loop devices and adjustable connectors; four-strand prototypes:

No matching product can be confirmed on the current list.

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Common worries about chip slipping into the bladder

The replies distinguish resistance from certainty, and the latest comparison remains a theoretical judgment.

"Can a bent connector stop my chip slipping out?"

In an entry published in January 2021, a short steel-ring chip customer wanted better positioning during urination. Mr. Okada said a rubber-coated bent connection offered somewhat better retention. He explained that the leading chip could still move toward the auxiliary piece, so supporting one part did not necessarily stabilize the other. His caution was that this connection provided no complete protection against outward ejection.

(Source: ok-lab's diary, published January 2021)
https://ok-lab.hatenablog.com/entry/2021/01/23/130107

"Can a curved loop guarantee bladder migration prevention?"

In an entry published in August 2024, a customer asked whether the curved loop on a requested connector would prevent excessive inward movement. OK Lab's reply said its uneven curve might resist passage better than an ordinary screw-shaped piece. The customer then requested a slightly larger loop, which the company agreed to make.

Mr. Okada also changed all such connectors so the retrieval thread emerged from the loop's tip. The company's caution remained that this shape could not be guaranteed to work for someone whose devices tended to move inward.

(Source: ok-lab's diary, published August 2024)
https://ok-lab.hatenablog.com/entry/2024/08/31/122909

"Which design did Mr. Okada favor for bladder migration?"

In an entry published in August 2026, a customer asked about shapes after inward movement continued despite a stopper. Mr. Okada thought a flexible-jointed design offered little resistance because it readily changed shape. He thought a larger wire loop might help, but could still collapse under sufficient force.

He favored an adjustable connector with a loop between 2 stoppers, sized larger than the customer's sphincter could accommodate. The diary does not record a result for that customer. Mr. Okada stressed that his preference was theoretical and might not work for the person's anatomy.

(Source: ok-lab's diary, published August 2026)
https://ok-lab.hatenablog.com/entry/2026/08/01/122916

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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.