My chip moves when I get an erection | The diary records movement in both directions [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 "the chip moving during erections or body movements" are summarized here, in publication order. 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, reports chips moving inward during erections, sometimes taking auxiliary parts with them.
• The maker discusses longer threads, flexible connections, and stoppers, while acknowledging limits and individual differences.
• Current products include models discussed in these entries; August 2026 reports still describe painful inward movement.

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 movement during erections

The OK Prostate Chip is a small urethral device intended to act on the prostate. This topic concerns changes in its position during erections or body movements, including movement toward the bladder and toward the outside. Early designs had a retrieval thread (thread intended to help recover the device) and an auxiliary chip (an additional piece behind the main chip). The diary describes these attachments as helping with handling and limiting movement.

An auxiliary chip moves during erections in the maker's early explanation

In an entry published in October 2017, Mr. Okada explained that an erection could draw the auxiliary chip farther into the urethra. He linked this to changes in penile length. The explanation concerned the smaller connected part.

(Source: ok-lab's diary, published October 2017)
https://ok-lab.hatenablog.com/entry/20171008/1507448709

A curved chip moving during erections caused one customer urethral pain

In an entry published in May 2018, a customer described initial experiences with a long glass chip. During an erection, its curve made alignment difficult; the customer reported that it turned sideways and caused some urethral pain. The account also described the chip coming out during urination. Mr. Okada's reply offered thanks, without specific advice about the sideways movement.

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

Chip movement during erections reached the bladder in a vibrating model

In an entry published in May 2020, a customer reported on a revised vibrating chip that remained painful to insert. The customer said it reached the bladder when an erection and muscle tightening occurred together. Mr. Okada suggested erection strength might explain why customers' experiences differed.

(Source: ok-lab's diary, published May 2020)
https://ok-lab.hatenablog.com/entry/2020/05/16/131332

Bleeding during morning erections worsened around one customer's shallowly positioned chip

In an entry published in July 2020, a customer described a 70mm chip positioned relatively shallowly. Morning erections brought intense tightening against its rear section, followed by bleeding. The bleeding worsened, and the customer stopped leaving the chip in place.

The customer requested a shorter custom design. Mr. Okada agreed, and the entry records design work. The diary does not record recovery or results with a replacement.

(Source: ok-lab's diary, published July 2020)
https://ok-lab.hatenablog.com/entry/2020/07/11/123235

Chip movement during shrinkage made an internal-wire prototype difficult to remove

In an entry published in January 2021, Mr. Okada described a prototype with surplus connecting wire inside the urethra. He reported that penile shrinkage drove the leading chip into the bladder. Removal became difficult. Mr. Okada rejected that configuration and warned against surplus wire inside.

(Source: ok-lab's diary, published January 2021)
https://ok-lab.hatenablog.com/entry/2021/01/30/122153

Chip slipping out during urination damaged a pure-silver test piece

In an entry published in May 2021, Mr. Okada suspected that erections during sleep had shifted a pure-silver chip. He reported that it then shot out during urination in 1 second, before he could react. It struck the toilet rim, and later inspection revealed scratches.

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

A chip moving during erections drew its auxiliary part completely inward

In an entry published in August 2021, a customer reported that an erection drew a medium-length chip and its auxiliary part completely inward. The device was recovered after the erection subsided, but fear prevented further use. Mr. Okada confirmed thread replacement was offered after the customer asked. He cautioned about erections after the whole chip passed the sphincter (the closing muscle described as gripping it).

(Source: ok-lab's diary, published August 2021)
https://ok-lab.hatenablog.com/entry/2021/08/28/125823

A missing chip after sleep raised concerns about inward movement

In an entry published in December 2021, a customer could no longer locate a custom linked assembly after sleeping. Mr. Okada relayed a possible explanation: a sleeping erection could push it bladderward after the screw attachment had crossed the sphincter. The diary does not record whether the device was recovered. Mr. Okada agreed that searching inside the bladder with wire was dangerous.

(Source: ok-lab's diary, published December 2021)
https://ok-lab.hatenablog.com/entry/2021/12/18/123756

Chip movement during erections prompted concern about a rigid supporting rod

In an entry published in June 2023, Mr. Okada described testing an S-shaped urethral sound (a rod intended here to support chip positioning). He believed the rigid rod had entered about halfway into the prostate region. He attributed excessive strain to erections pulling against this arrangement.

Mr. Okada writes that he experienced heart failure and had difficulty removing the rod. He reported improvement after its removal.

(Source: ok-lab's diary, published June 2023)
https://ok-lab.hatenablog.com/entry/2023/06/03/121955

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The maker's answer to chip movement during erections

The diary describes changes to thread length, connection flexibility, and stalk length, with limits attached to each approach.

Longer retrieval threads addressed one report of a chip moving deeper

In an entry published in January 2018, a customer wanted a longer retrieval thread because muscle contractions drew a custom chip inward. The existing maximum of 25cm had proved insufficient for that customer. A note in the entry says lengths beyond 25cm could subsequently be requested in the order remarks.

The diary does not record how a longer replacement performed for this customer. Mr. Okada cautioned that the account described an individual's experience and that responses varied.

(Source: ok-lab's diary, published January 2018)
https://ok-lab.hatenablog.com/entry/20180118/1516263011

Flexible connections reduced chip movement from penile bending in one test

In an entry published in April 2021, Mr. Okada described a linked assembly whose stiff connection transmitted penile bending to the prostate-side chip. He reported improved stability after changing the relevant connection to a softer construction. His recommendation concerned long assemblies reaching the penile urethra; shorter assemblies did not require that softer connection in his tests.

(Source: ok-lab's diary, published April 2021)
https://ok-lab.hatenablog.com/entry/2021/04/03/130518

Flexible tube tails accommodated chip movement during erections in the maker's tests

In an entry published in December 2023, Mr. Okada described a 2.5mm tube tail (a silicone cover around part of the retrieval thread). In his tests, it bent as the urethra shortened and straightened during an erection. The test assemblies included screw-shaped attachments.

The published price was ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) excluding tax for lengths up to 15cm, or ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04) excluding tax for 16-25cm. These were December 2023 prices. Mr. Okada did not recommend the multiple-screw test arrangement for general users.

(Source: ok-lab's diary, published December 2023)
https://ok-lab.hatenablog.com/entry/2023/12/09/123055

Mr. Okada favored shorter stalks after painful chip movement with an arrowhead prototype

In an entry published in February 2024, Mr. Okada described an arrowhead-shaped prototype with a long rear stalk. He reported that changes in penile position moved the whole device and caused sphincter pain. He preferred a shorter stalk for prolonged placement, then tested a version with a tube tail replacing the stalk.

He also described considerable difficulty removing the arrowhead design. Mr. Okada called the design dangerous and warned that removal could cause bleeding.

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

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 movement during erections changed over time

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OK Prostate Chip products related to chip movement during erections

The current list includes the resin chip and screw attachment discussed in an April 2026 positioning question.

Products that appear in these entries

The medium-length second-generation resin chip is listed in OK Lab's own online store.

(Source: ok-lab's diary, published April 2026)
https://ok-lab.hatenablog.com/entry/2026/04/18/122906

Products the diary mentioned as alternatives

The diary names no alternative.

Custom short chip, revised vibrating chip, internal-wire assembly, pure-silver test chip: No matching product can be confirmed on the current list.

Linked screw assembly, flexible connection, S-shaped sound, tube tail, arrowhead prototype: No matching product can be confirmed on the current list.

August 2026 adjustable locking-loop and spiral custom builds: No matching product can be confirmed on the current list.

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Common worries about chip movement during erections

In these replies, inward movement alone did not settle questions about exact position or the effectiveness of a stopper.

"Does a chip moving deeper prove it is correctly positioned?"

In an entry published in April 2018, a customer asked whether repeated inward movement meant correct placement. Mr. Okada initially said this suggested at least half, or all, of the first chip had reached the urethra within the prostate. The customer then clarified a concern about going too far.

Mr. Okada acknowledged that he could not identify a single correct position. He also cautioned against deeper testing to establish location.

(Source: ok-lab's diary, published April 2018)
https://ok-lab.hatenablog.com/entry/20180414/1523697398

"Can erections pull in the safety chip despite 25cm thread?"

In an entry published in February 2020, a customer reported an erection drawing in the safety chip (a thread-mounted safeguard), with urethral discomfort. Their thread was 25cm, and they were considering roughly 30cm. They asked whether the thread could be replaced.

OK Lab offered replacement for ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax, with additional charges for threads carrying auxiliary parts. The diary does not record whether the replacement was completed or relieved the discomfort.

(Source: ok-lab's diary, published February 2020)
https://ok-lab.hatenablog.com/entry/2020/02/01/151232

"Does a chip moving deeper explain weak urine flow?"

In an entry published in April 2026, a customer using the second-generation resin chip and screw attachment asked about inward movement and weak urine flow. Mr. Okada suggested that the attachment's position could also be involved. He said closing-muscle action could move the chip either way. His reply emphasized individual differences rather than providing a universal interpretation of the reported sensations.

(Source: ok-lab's diary, published April 2026)
https://ok-lab.hatenablog.com/entry/2026/04/18/122906

"Can sphincter stoppers prevent a chip moving deeper?"

In entries published in August 2026, a customer asked about inward movement despite a sphincter stopper (an attachment intended to resist that movement). The confirmed follow-up described natural movements of muscles at the base of the pelvis pulling the chip inward. The stopper turned sideways and painfully passed the sphincter.

Mr. Okada said a flexible joint offered little resistance; loop-based designs could resist movement but could also deform. He proposed an adjustable locking loop while explicitly describing his suggestions as theoretical and dependent on the customer's body. The customer requested custom alternatives, but the diary does not record their performance.

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

(Source: ok-lab's diary, published August 2026)
https://ok-lab.hatenablog.com/entry/2026/08/08/122906

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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.