Can an external stopper keep my chip from slipping inside? | It offers no guarantee [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 "external stoppers" 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

An external stopper is intended to keep the retrieval thread outside, even if the chip moves into the bladder.

The maker says changes in body size can limit what an external stopper prevents.

The current product list includes three-hole and six-hole external stoppers.

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: external stoppers for prostate chips

The OK Prostate Chip is a small device placed in the urethra so that it acts on the prostate. An external stopper is a separate stopping part outside the penis head, associated with the retrieval thread (the attached thread intended for withdrawal). OK Lab's March 2019 reply described its purpose as keeping that thread outside even if the main chip entered the bladder. Later entries discuss several versions and explain why the maker did not regard the external part as an unconditional barrier against inward movement.

One enlarged connector served as an external stopper within a custom design

In an entry published in November 2019, a customer requested a custom vibrating assembly with 3 motors. They wanted an enlarged electrical connector to serve as an external stopper. The request specified a 24cm cable section and offered different connector shapes.

Mr. Okada recorded the customer's choice of Plan A. The diary does not record how that connector felt in use. No matching product can be confirmed on the current list.

(Source: ok-lab's diary, published November 2019)
https://ok-lab.hatenablog.com/entry/2019/11/23/162919

An external stopper position did not resolve one customer's fitting problem

In an entry published in January 2020, a customer said a 10 mm vibrating chip would not pass the outer urinary sphincter (a muscle ring). Mr. Okada suspected overlap between a screw-shaped auxiliary chip (a twisted supporting part) and a parallel-cable stopper (a cable-mounted stopping part). His reply proposed an external role for the cable stopper, separate from the screw.

The customer clarified that the stopper was already outside the penis head, so that explanation did not settle the problem. Further exchanges ended with a report of successful insertion, but also a partly exposed motor. Mr. Okada qualified his initial suggestion as advice based on personal experience.

(Source: ok-lab's diary, published January 2020)
https://ok-lab.hatenablog.com/entry/2020/01/25/150127

An external stopper did not reassure the maker about inward movement

In an entry published in February 2024, a customer described a long chip entirely beyond the outer urinary sphincter. They relied on an external stopper and believed the front end had reached the bladder. Mr. Okada explained that his basic design used the rear bulge to resist passage beyond that muscle.

He thought a long chip fully beyond it had a substantially greater chance of entering the bladder. The diary does not record clinical confirmation of the chip's position. Mr. Okada cautioned that his own marked shrinkage could let the chip reach the bladder despite an external stopper.

(Source: ok-lab's diary, published February 2024)
https://ok-lab.hatenablog.com/entry/2024/02/10/123023

The six-hole external stopper had a documented price in December 2025

In an entry published in December 2025, a custom-order record priced the six-hole external stopper at ¥1,650 (about $11 at ¥156 = $1, rate as of 2026-09-04) for 1 item. The customer wanted it alongside a ceramic semi-long chip with 2 threads. The diary does not record how that assembly felt in use.

(Source: ok-lab's diary, published December 2025)
https://ok-lab.hatenablog.com/entry/2025/12/20/123000

The three-hole external stopper had its own January 2026 price

In an entry published in January 2026, the three-hole external stopper appeared at ¥1,100 (about $7 at ¥156 = $1, rate as of 2026-09-04) for 1 item. The order also included internal stoppers (parts intended to limit inward movement), plus resin and ceramic chips. The diary does not record whether the combination stayed in place during use.

(Source: ok-lab's diary, published January 2026)
https://ok-lab.hatenablog.com/entry/2026/01/24/122909

A larger external stopper carried an additional custom manufacturing charge

In an entry published in August 2026, a customer requested an external stopper measuring 2cm vertically and 2cm horizontally. They left the thickness to the maker. OK Lab quoted the ordinary 6-hole stopper plus a ¥1,100 (about $7 at ¥156 = $1, rate as of 2026-09-04) custom manufacturing charge.

The diary does not record the finished thickness or performance. No matching product can be confirmed on the current list.

(Source: ok-lab's diary, published August 2026)
https://ok-lab.hatenablog.com/entry/2026/08/22/122905

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The maker's answer to external stoppers for prostate chips

The maker proposed different stopping arrangements while acknowledging practical difficulties and individual differences.

An external stopper featured in Mr. Okada's simpler alternative mechanism

In an entry published in February 2022, a customer proposed a catheter (a tube for the urethra) attachment to help control chip positioning. They wanted a small mechanism that could hold and release the chip, reducing difficult handling. Mr. Okada said he could not make the miniature, soft, moving structure they described.

His alternative concept used the retrieval thread and an external stopper to keep the chip and catheter close together. Mr. Okada cautioned that the concept still risked unwanted movement of the thread or internal stopper.

(Source: ok-lab's diary, published February 2022)
https://ok-lab.hatenablog.com/entry/2022/02/19/123621

Twelve-hole external stoppers addressed four threads but increased handling resistance

In an entry published in July 2023, Mr. Okada introduced 12-hole internal and external stoppers for 4 retrieval threads. The external version came in one size and cost ¥2,500 (about $16 at ¥156 = $1, rate as of 2026-09-04) excluding tax, as published then. He said unexpected demand prompted him to make these parts sooner than planned.

He reported much greater resistance to adjustment than with the 3-hole and 6-hole designs. No matching product can be confirmed on the current list. Mr. Okada cautioned that fitting these parts was difficult because long threads could become tangled.

(Source: ok-lab's diary, published July 2023)
https://ok-lab.hatenablog.com/entry/2023/07/15/123004

An external stopper offered a barrier away from the main chip

In an entry published in December 2023, a customer asked whether two newly ordered long chips needed extra stopping parts. Staff initially linked discomfort with an older combination to its close spacing and offered reassembly, pausing the new order. The customer clarified that the discomfort concerned passage near the penis head, while another chip tended to move into the bladder.

Mr. Okada suggested a barrier farther from the main chip, potentially an external stopper, because internal stopping parts were not infallible. He acknowledged that his own problem involved movement in the opposite direction, limiting what his personal experience could establish. He considered auxiliary screws, internal stoppers, or both reasonable additions for this customer's concern.

(Source: ok-lab's diary, published December 2023)
https://ok-lab.hatenablog.com/entry/2023/12/23/122035

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 external stoppers for prostate chips changed over time

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OK Prostate Chip products related to external stoppers for prostate chips

The current list includes two external stopper formats and the distinct stopping parts recommended in March 2019.

Products that appear in these entries

The three-hole external stopper is listed in OK Lab's own online store.

The six-hole external stopper is listed in OK Lab's own online store.

(Source: ok-lab's diary, published December 2025)
https://ok-lab.hatenablog.com/entry/2025/12/20/123000

(Source: ok-lab's diary, published January 2026)
https://ok-lab.hatenablog.com/entry/2026/01/24/122909

Products the diary mentioned as alternatives

The thread-retaining stopper is listed in OK Lab's own online store.

The three-hole internal stopper is listed in OK Lab's own online store.

(Source: ok-lab's diary, published March 2019)
https://ok-lab.hatenablog.com/entry/2019/03/23/173222

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Common worries about external stoppers for prostate chips

Reader questions concerned lost threads, removal problems, and changing body size.

"Can an external stopper help when the retrieval thread disappears?"

In an entry published in March 2019, a customer using a cross-jointed resin chip noticed its final white piece had disappeared. They found it partway inside the urethra and asked whether medical help was necessary. Mr. Okada replied that a cross-jointed chip might fold inside the bladder and fail to come out during urination.

The customer later reported that it came out during forceful urination, then asked about prevention. OK Lab's sales staff recommended an external stopper so the thread would remain outside even if the chip entered the bladder. They also suggested an internal stopper for the separate aim of preventing the chip itself from reaching the bladder.

(Source: ok-lab's diary, published March 2019)
https://ok-lab.hatenablog.com/entry/2019/03/23/173222

"What if removal fails without an external stopper?"

In an entry published in December 2022, a customer asked about a screw-shaped auxiliary chip that prevented removal. They reported that the screw had bent against the main chip, creating a combined width of about 15 mm. OK Lab initially considered cable cutting theoretically possible, but warned that exposed wire ends could cause minor urethral injury.

A urologist removed the device; the customer reported a small injury, 1 week of antibiotics, and ¥1,760 (about $11 at ¥156 = $1, rate as of 2026-09-04) under Japan's public health insurance. That customer had forgotten an external stopper and believed it would have prevented the accident. OK Lab's reply favored medical assessment because attempting to cut the cable inside the urethra worried its staff.

(Source: ok-lab's diary, published December 2022)
https://ok-lab.hatenablog.com/entry/2022/12/24/122944

"Can an external stopper guarantee protection as body size changes?"

In an entry published in May 2024, a semi-long chip user asked whether an external stopper would reliably prevent entry into the bladder. Mr. Okada's comparison concerned extra thread after shrinkage, with the stopper initially snug outside the penis head during full erection. Under those conditions, he thought about 3cm of extra thread would prevent bladder entry, while 5cm could allow it.

These were his judgments about that situation, rather than verified limits applying to every reader. The diary does not record a follow-up confirming the customer's outcome. Mr. Okada said substantial shrinkage could require a different stopper position, and cautioned that individual differences made general advice difficult.

(Source: ok-lab's diary, published May 2024)
https://ok-lab.hatenablog.com/entry/2024/05/25/122919

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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.