Why aren't these parts sold ready-made? | The reason depends on the accessory [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 "recommending DIY instead of selling finished products" 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

Some accessories were withheld, discontinued, or left unfinished because of failures, discomfort, manufacturing limits, or fitting demands.

Mr. Okada proposed homemade items or supplied parts, with customers responsible for fitting and some replacement work.

The latest supplied entries describe March 2023 plans, without establishing whether those proposed parts are available today.

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: ready-made prostate chip accessories

The OK Prostate Chip is a small device placed in the urethra (the urine passage) to act on the prostate. These entries discuss DIY (do-it-yourself) accessories, including thread stoppers, wire supports, longer tubes, and equipment intended to keep the penis retracted. Some connect with a chip or cable, while other pieces form external supports around the genitals. Mr. Okada's reasons for suggesting DIY included breakage, pain during testing, difficult custom work, and individual fitting demands.

Custom prostate chip accessories still received a quotation in February 2019

In an entry published in February 2019, a customer requested a larger spiral rectal chip (an accessory for pressure inside the rectum). Mr. Okada quoted for a 50mm spiral instead of 35mm, with a base strip about 30cm long instead of about 23cm. His price was ¥350 (about $2 at ¥156 = $1, rate as of 2026-09-04) per 1cm, tax excluded, with a stated surcharge of ¥2,500, (about $16 at ¥156 = $1, rate as of 2026-09-04) tax excluded, over the standard chip.

The diary does not record whether payment or delivery followed. No matching product can be confirmed on the current list. Mr. Okada cautioned that the maximum feasible diameter remained unknown, having received a report that a 10cm spiral had been crushed.

(Source: ok-lab's diary, published February 2019)
https://ok-lab.hatenablog.com/entry/2019/02/16/171153

A DIY vibrating chip brought safety warnings in October 2021

In an entry published in October 2021, Mr. Okada described an experimental vibrating chip powered by a motor outside the urethra. He called the original prototype dangerous because it lacked a stopper and advanced past the prostate, deep into the bladder. A later version had a wire stopper, which he suggested might make it somewhat safer.

He quoted ¥1,000, (about $6 at ¥156 = $1, rate as of 2026-09-04) tax excluded, for that stopper, leaving the remaining construction to customers at their own risk. No matching product can be confirmed on the current list. He favored wire no thicker than 0.5mm and replacement for every use, warning that wire would eventually break.

(Source: ok-lab's diary, published October 2021)
https://ok-lab.hatenablog.com/entry/2021/10/09/125823

Pain kept ready-made long-tube accessories off sale in April 2022

In an entry published in April 2022, Mr. Okada described testing longer silicone tubing (flexible hollow tubing) in connection with a chip. He reported severe pain developing over time, with pain also recurring in tests using a tube around 7cm long. He suspected silicone was sticking to the inner surface of the urethra as it dried during extended use.

He decided against selling the long-tube version because he did not want to offer equipment unsuitable for extended use. He distinguished these tests from shorter tubing near the penis tip, which he said had caused him no discomfort. Despite declining to sell it, Mr. Okada suggested independent sourcing for anyone who still wanted to explore the long-tube idea.

(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/23/123121

Larger DIY rectal chips reflected production limits in September 2022

In an entry published in September 2022, Mr. Okada described a redesigned rectal chip intended to press from inside the rectum. Published sizes were 80mm (M), 70mm (S), and 90mm (L), with width around 12mm and a bulge around 25mm. He priced the plain version at ¥6,000, (about $38 at ¥156 = $1, rate as of 2026-09-04) tax excluded, with tubing suspension adding ¥1,000, (about $6 at ¥156 = $1, rate as of 2026-09-04) tax excluded.

He was reluctant to accept larger custom builds because they required much more labor, time, and physical effort. No matching product can be confirmed on the current list. Because he saw no special manufacturing know-how involved, Mr. Okada suggested DIY for people seeking larger versions.

(Source: ok-lab's diary, published September 2022)
https://ok-lab.hatenablog.com/entry/2022/09/10/122847

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The maker's answer to ready-made prostate chip accessories

Mr. Okada's proposals separated the parts he would supply from the fitting and work he expected customers to handle.

DIY tubing accessories reduced what Mr. Okada planned to supply

In an entry published in November 2022, Mr. Okada proposed supplying only the external retaining piece for equipment intended to keep the penis retracted. His proposed DIY accessories were a tube ring behind the testicles and a T-shaped belt (a waist-and-crotch support). Even if he supplied them, he said, customers would still need to adjust their size.

He also abandoned selling the proposed silicone-tubing underwear, froze that idea, and decided against applying for a patent for it. The retaining piece's design was still under consideration. Mr. Okada suggested buying tubing directly elsewhere, expecting that to cost less once shipping was considered.

(Source: ok-lab's diary, published November 2022)
https://ok-lab.hatenablog.com/entry/2022/11/05/122757

Wire failures changed the proposed design of DIY prostate chip accessories

An entry published in January 2023 reported that earlier 4-line and 6-line cable supports had already been discontinued following failure reports. A wire-and-tube chip support (called a pessary in the diary) had also been withdrawn after reports of breakage or possible breakage. His revised policy ruled out direct wire connections to cables or chips, because he now treated wire breakage as inevitable.

Instead, the planned supply consisted of tubing, or cables accompanied by tubing, with wire selection and fitting assigned to customers. Mr. Okada placed responsibility for wire fitting and timely replacement on the customer.

(Source: ok-lab's diary, published January 2023)
https://ok-lab.hatenablog.com/entry/2023/01/07/123115

DIY parts addressed Mr. Okada's concerns about individual fitting support

In an entry published in March 2023, Mr. Okada worried that selling a completed retaining device would create difficult demands for individual support. He considered withholding it entirely or selling it without offering personal help to customers who could not make it work. He then proposed selling parts, accompanied by a manual, to people capable of completing the device themselves.

Under that proposal, the customer would be responsible for the fit, shape, and final assembly. The entry presents an idea under consideration; it does not confirm that parts or a manual had become available. Mr. Okada suggested help from an acquaintance with making or assembly skills when the customer could not do that work.

(Source: ok-lab's diary, published March 2023)
https://ok-lab.hatenablog.com/entry/2023/03/04/123042

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 ready-made prostate chip accessories changed over time

The diary does not say what the current state is.

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OK Prostate Chip products related to ready-made prostate chip accessories

No current product is directly tied to this topic.

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Common worries about ready-made prostate chip accessories

The replies give different answers for a broken stopper, a requested cable, and a proposed device awaiting sale.

"Why was DIY suggested after a thread stopper broke?"

In an entry published in February 2019, a customer reported a thread stopper breaking before use, while the thread was being attached. The customer questioned its strength and asked for better quality control; Mr. Okada acknowledged several similar reports. He had considered ending sales, but kept it available after the sales representative objected to withdrawing the cheaper option.

He could see no strengthening solution beyond changing the resin material, and had no clear prospect of doing that. The diary does not record a replacement or the customer's later experience. He described a stopper with two slits and suggested soft household materials, including a drink-cap liner.

(Source: ok-lab's diary, published February 2019)
https://ok-lab.hatenablog.com/entry/2019/02/16/171153

"Can OK Lab supply DIY cable parts for a stocking?"

In an entry published in January 2023, a customer wanted a sharply bending support cable for use with a penis-covering stocking. Mr. Okada ruled out the older requested supports and said later flexible designs were unsuitable for the necessary 180-degree bend. He proposed the customer-finished 3-line cable (a cable with a companion tube), with cable and wire sold separately.

He also offered separate wire-fitting work, but the entry does not record a completed order or the customer's experience. No matching product can be confirmed on the current list. Mr. Okada continued to assign replacement before deterioration to the customer, even when offering that extra work.

(Source: ok-lab's diary, published January 2023)
https://ok-lab.hatenablog.com/entry/2023/01/07/123115

"Will the proposed DIY retaining device actually go on sale?"

In an entry published in March 2023, Mr. Okada acknowledged concerned inquiries following his earlier discussion about whether to sell the device. He said he intended to sell it, with parts selected according to how the customer wanted to use the equipment. He envisaged optional components, including an option without the urethral instrument for customers uncomfortable with that element.

That statement was an intention to sell; the entry does not record a release date. No matching product can be confirmed on the current list. He still assigned fitting to customers and said the proposed device would not be ready to use straight from purchase.

(Source: ok-lab's diary, published March 2023)
https://ok-lab.hatenablog.com/entry/2023/03/11/122451

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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.