Where is my prostate chip? | Touch and thread provide limited clues [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 "checking chip position by touch or thread" 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

• A chip can become difficult to feel, and remaining thread length alone cannot establish its position.
• Mr. Okada describes physical reference points, while acknowledging differences between bodies and chip designs.
• An August 2026 change extended thread beyond its marker, with an exception at maximum length.

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: checking prostate chip position

The OK Prostate Chip is a small device placed in the urethra so that it acts on the prostate. The diary discusses recognizing its position through the skin, through attached parts that remain detectable, and through changes in exposed thread. These references concern a device hidden inside the urine passage, including the bend near the prostate. The accounts below describe both useful clues and situations where customers remained uncertain or needed hospital treatment.

Longer thread length became possible after the earlier maximum proved insufficient

In an entry published in January 2018, a customer reported that a custom chip's 25cm thread was too short for their circumstances. They wanted a longer option, and an annotation says lengths beyond 25cm could then be requested.

The diary does not record whether that customer received a longer thread. No matching product can be confirmed on the current list. The entry directs longer-thread requests to the order notes.

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

Linked chip position became a safety concern after hospital removal

In an entry published in March 2018, a customer reported hospital removal after linked chips tangled in what they described as the prostate. Mr. Okada called this his first report of hospital removal; the anonymous message left other circumstances unknown. He suspected that a chip had reversed direction, allowing the pair to overlap.

The planned leading-chip length changed from 25–28mm to 30mm or more. He acknowledged that even the longer design might turn around in some bodies. His advice emphasized confirming by touch that the chips formed a lengthwise chain.

(Source: ok-lab's diary, published March 2018)
https://ok-lab.hatenablog.com/entry/20180310/1520672565

Curved tails made chip position easier to feel in early vibrating models

In an entry published in March 2019, Mr. Okada introduced a curved cable-connection tail on vibrating Version 2. He described the tail as touchable even when the short chip's body lay entirely within the prostate.

The design included 8–10mm of resin beyond the chip's rear to support the cable connection. No matching product can be confirmed on the current list. Mr. Okada cautioned that one illustrated deeper placement was excessive.

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

Cable stoppers added another reference for checking chip position by touch

An entry published in July 2019 described a cable stopper with a proposed price of ¥1,500 (about $10 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Planned sizes were M at 9mm and L at approximately 11mm. The design specified a gap of approximately 15mm or more between the main chip and stopper.

Mr. Okada cautioned that a stopper caught in the muscle could also be drawn farther inward. No matching product can be confirmed on the current list. His advice centered on a touch reference in the bulbar urethra (the wider section near the bend).

(Source: ok-lab's diary, published July 2019)
https://ok-lab.hatenablog.com/entry/2019/07/06/152113

Uncertain chip position accompanied a version-four removal problem in September 2020

In an entry published in September 2020, a customer could neither remove nor externally locate a curved chip (Umiushi Ver.4). Mr. Okada suggested its off-center thread attachment might explain the difficulty. A follow-up received the next day reported successful removal.

Mr. Okada acknowledged that he had not personally tested this version before receiving the report. No matching product can be confirmed on the current list. He advised consulting a urologist if the chip could not be removed.

(Source: ok-lab's diary, published September 2020)
https://ok-lab.hatenablog.com/entry/2020/09/05/095734

A folded pair complicated chip position after previously uneventful use

In an entry published in August 2022, a customer reported trouble with a short resin chip supplied with an auxiliary chip. Earlier use had involved no strong pain, but the linked pieces became folded together and stuck for 5 days. A hospital removed them using a cystoscope (a viewing instrument) and forceps (gripping tools).

The customer reported some bleeding and pain afterward, without disruption to everyday life. No matching product can be confirmed on the current list. Mr. Okada's advice stressed reassessing the pair's shape through touch when more thread disappeared than usual.

(Source: ok-lab's diary, published August 2022)
https://ok-lab.hatenablog.com/entry/2022/08/20/122920

Extra thread length became standard behind safety chips in August 2026

In an entry published in August 2026, Mr. Okada changed the standard safety chip (a marker intended to prevent thread disappearing). Approximately 5–10cm of nylon thread would extend behind the specified marker position. Mr. Okada's example retained the marker at 20cm, with the extension beyond it.

The standard safety chip remained free; additional ones cost ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) excluding tax each, as published in August 2026. He suggested that marker positions could help distinguish deeper movement from movement away from the prostate.

(Source: ok-lab's diary, published August 2026)
https://ok-lab.hatenablog.com/entry/2026/08/15/122912

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The maker's answer to checking prostate chip position

Mr. Okada's answers use physical reference points, while later entries emphasize differences in anatomy and design.

A touch reference gave thread length meaning in an early reply

In an entry published in January 2018, a beginner asked about losing track of the chip beyond the base of the penis. Mr. Okada suggested that uncertainty could arise in the wider section near the bend.

The diary does not record whether that customer's uncertainty was resolved. His proposed estimate combined thread travel with the point where the chip became detectable to a finger at the bulbar urethra.

(Source: ok-lab's diary, published January 2018)
https://ok-lab.hatenablog.com/entry/20180127/1517054930

Shorter exposed thread length was treated as a possible tangle

In an entry published in March 2018, Mr. Okada considered how a retrieval thread (the thread attached for removal) could catch around linked chips. He estimated that such a tangle would shorten the exposed thread by at least 6cm.

He acknowledged that the change might go unnoticed because the tangle was hidden inside the body. His advice treated unexpected shortening as a possible tangle requiring reassessment, without force.

(Source: ok-lab's diary, published March 2018)
https://ok-lab.hatenablog.com/entry/20180312/1520844839

An auxiliary screw provided a separate clue to chip position

In an entry published in May 2020, a first-time buyer of a short twisted ceramic chip requested additional stoppers over concerns about inward movement. OK Lab accepted the additions; the diary does not record how this customer's completed setup felt in use.

Mr. Okada's intended arrangement placed only the main chip beyond the external urethral sphincter (the controllable muscle before the prostate). He advised awareness of the auxiliary screw (a twisted support accessory), whose rear was intended to remain perceptible through the skin.

(Source: ok-lab's diary, published May 2020)
https://ok-lab.hatenablog.com/entry/2020/05/09/143600

Shape-memory wire extended the accessible reference for checking chip position

An entry published in April 2024 described linked chips supported by shape-memory wire (wire that recovers a preset shape). Mr. Okada said the rear chip remained detectable in the bulbar urethra while the front chip occupied the prostate.

He also attributed support against movement in either direction to the wire connection. No matching product can be confirmed on the current list. His proposed approach used the accessible rear chip as a reference for the whole assembly's position.

(Source: ok-lab's diary, published April 2024)
https://ok-lab.hatenablog.com/entry/2024/04/06/122941

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 checking prostate chip position changed over time

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OK Prostate Chip products related to checking prostate chip position

The current list includes the ceramic and resin models named in these placement questions.

Products that appear in these entries

(Source: ok-lab's diary, published May 2020)
https://ok-lab.hatenablog.com/entry/2020/05/09/143600

(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.

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Common worries about checking prostate chip position

Later replies qualify the idea that touch or exposed thread can establish exactly where a chip sits.

"Can thread length prove the chip reached my prostate?"

In an entry published in December 2020, a beginner asked whether 15cm of visible thread meant their chip had not reached the prostate. They had reported repeated difficulty with a short twisted ceramic chip.

Mr. Okada said no fixed remaining length could settle that question because urethral length varies between individuals. The diary does not record whether this customer subsequently achieved the intended position. His proposed assessment depended on knowing the customer's own urethral length.

(Source: ok-lab's diary, published December 2020)
https://ok-lab.hatenablog.com/entry/2020/12/12/124126

"Does an unfelt auxiliary screw mean incorrect chip position?"

In an entry published in April 2026, a customer asked about the intended position of their medium-length second-generation resin chip and auxiliary screw. Mr. Okada described the muscle gripping either the main chip's final hollow or the gap behind its entire body.

He said body differences could make the screw difficult to feel even while it remained on the nearer side of the muscle. His reply did not establish which arrangement this customer had. He advised interpreting position with individual anatomy and thread information in mind.

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

"Does weak sensation tell me my chip position?"

In an entry published in August 2026, a customer asked whether weak sensation and resistance to removal meant the chip was correctly positioned. Mr. Okada considered several possible positions; the reply did not establish the customer's actual location.

His proposed estimates compared thread positions against initial sphincter contact: roughly 50mm farther for the prostate area. He described 100mm farther as more suggestive of the bladder. His advice relied on an individual reference point, and he presented these distances as estimates.

(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.