Does a vibrating prostate chip need nylon thread? | It depends on the cable and stopper [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 "adding nylon thread to a vibrating chip" 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

• Nylon thread provides an attachment for a stopper intended to limit a vibrating chip's movement toward the bladder.
• Mr. Okada treated thread as optional for standard cables, but essential for an extra-thin custom cable.
• The current product list prices the nylon-thread addition at ¥1,100 (about $7 at ¥156 = $1, rate as of 2026-09-04) including tax.

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: adding nylon thread to a vibrating chip

The OK Prostate Chip is a small device placed in the urethra (the urine passage) to act on the prostate. The vibrating version has a motor and an electrical cable, while optional nylon thread runs beside that cable. The diary describes the thread as a place for a sphincter stopper (a positioning part intended to limit movement toward the bladder). It also records Mr. Okada's views about breakage and retrieval.

A customer requested nylon thread because their chip kept moving inward

In an entry published in February 2019, a customer requested nylon thread because their chip tended to move into the bladder. They wanted a stopper on the thread and doubted the electrical lead alone would accommodate it. Mr. Okada wrote that he had tested the requested addition himself.

According to his reply, the gradual, cone-shaped chip-to-cable connection would make retrieval smoother even after movement into the bladder. The diary does not record how the requested setup worked for that customer. Mr. Okada suggested the cable-and-thread combination could offer better control than thread alone.

(Source: ok-lab's diary, published February 2019)
https://ok-lab.hatenablog.com/entry/2019/02/02/153358

Nylon thread carried its own charge in early resin-chip pricing

An entry published in February 2019 priced nylon-thread embedding in resin (the chip's molded material) at an additional ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) excluding tax. The thread charge was separate from the price of the chip body and the charges for embedded motors. Mr. Okada included a thread-equipped example when explaining the pricing of a resin chip with two motors. The diary does not record a separate performance result for that example's added thread.

(Source: ok-lab's diary, published February 2019)
https://ok-lab.hatenablog.com/entry/2019/02/09/152257

Nylon thread was requested for only the short ceramic vibrating chip

In an entry published in December 2019, a customer requested nylon thread and a stopper specifically for a short ceramic vibrating chip. The listed thread option cost ¥1,100 (about $7 at ¥156 = $1, rate as of 2026-09-04) for one, with the stopper shown as a separate item. Although the same order included an elongated ceramic vibrating chip, the thread-and-stopper request applied only to the short model. The diary does not record a thread-specific reply or the customer's later experience with this setup.

(Source: ok-lab's diary, published December 2019)
https://ok-lab.hatenablog.com/entry/2019/12/07/162608

Nylon thread left questions about stopper performance unresolved for Mr. Okada

In an entry published in February 2020, a customer compared a parallel cable stopper (a positioning part fitted to the cable) with thread-mounted stoppers. Mr. Okada said he had not personally used the added-thread-and-stopper arrangement. He believed motor failure would precede cable breakage, rather than the cable breaking suddenly.

He expected smooth retrieval even with the whole chip inside the urethra, and did not envisage it becoming unrecoverable in the bladder. However, he said he could not judge whether a thread-mounted stopper would function properly alongside the cable. The diary does not record comparative test results for the stopper arrangements.

(Source: ok-lab's diary, published February 2020)
https://ok-lab.hatenablog.com/entry/2020/02/29/155031

Motor placement changed a custom chip ordered with nylon thread

In an entry published in April 2022, a customer requested a custom ceramic vibrating chip with nylon thread and a stopper. Their chosen custom shape was nicknamed the sea slug, version 4. Mr. Okada explained that adding a motor would remove its distinctive rear shape.

The diary does not record how the revised chip felt in use. Mr. Okada proposed version 3 modified 1, and the customer agreed to that change.

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

Nylon thread emerged from the rear of a vibrating multi-part design

An entry published in June 2024 described a vibrating multi-part chip called the Prostate Alien. Mr. Okada said optional nylon thread could be added, as with ordinary vibrating chips. The thread would emerge from the device's rear end, alongside its standard electrical cable.

The motor was at the front, so the thread did not emerge beside it. Mr. Okada listed the vibrating build at ¥17,000 (about $109 at ¥156 = $1, rate as of 2026-09-04) excluding tax, with additional accessories priced separately. His recommendation was to avoid prolonged vibration, which he thought would be difficult to tolerate.

(Source: ok-lab's diary, published June 2024)
https://ok-lab.hatenablog.com/entry/2024/06/08/123008

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The maker's answer to adding nylon thread to a vibrating chip

Mr. Okada's answer depended on the cable's strength, the intended stopper, and the particular design.

Mr. Okada presented nylon thread as an optional backup for standard cables

In an entry published in February 2019, a customer asked whether cable strength justified adding nylon thread. Mr. Okada explained that thread chiefly enabled a sphincter stopper for people whose chips tended to move into the bladder. He thought the thread might offer extra safety if the resin broke, because it was attached to the front glass part.

He also suggested two attached lines might make retrieval easier if the chip slipped farther into the urethra. Nevertheless, he did not consider cable-only vibrating chips to have a retrieval problem. His advice was to weigh those possible benefits against the extra cleaning and storage work.

(Source: ok-lab's diary, published February 2019)
https://ok-lab.hatenablog.com/entry/2019/02/23/142754

Extra-thin custom cable made nylon thread essential under the maker's conditions

In an entry published in June 2020, a customer supplied unusually thin cable and requested nylon thread on several vibrating chips. Mr. Okada initially made acceptance conditional on checking the cable, because an inadequate connection could mean refusing the job. After inspecting it, he reported that the internal wires looked suitable for connection, but the bond to their covering remained under test.

He expected almost no durability under retrieval loads and warned that repeated sharp bending could break the cable. The diary does not record the bond-test result or whether the proposed devices were completed. His acceptance condition assigned 100% of retrieval load to nylon thread and excluded strong pulling forces on the cable.

(Source: ok-lab's diary, published June 2020)
https://ok-lab.hatenablog.com/entry/2020/06/27/120614

Mr. Okada proposed nylon thread instead of a stopper on parallel cable

In an entry published in February 2022, Mr. Okada introduced a two-purpose positioning wire (an accessory intended to help move a chip). One end was designed for chips with nylon thread, and the other for vibrating chips with an electrical cable. He thought the parallel cable stopper could obstruct movement with this accessory.

For a vibrating chip needing a stopper, he suggested added nylon thread with a sphincter stopper instead. The prototype cost ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) excluding tax, and he offered it only as a custom order at that stage. He also cautioned that movement of the accessory could unintentionally pull the nylon thread.

(Source: ok-lab's diary, published February 2022)
https://ok-lab.hatenablog.com/entry/2022/02/26/123231

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 adding nylon thread to a vibrating chip changed over time

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OK Prostate Chip products related to adding nylon thread to a vibrating chip

The current list includes the thread option and separately priced products that appeared in these cases.

Products that appear in these entries

The nylon-thread addition is listed in the company's own online store.

(Source: ok-lab's diary, published December 2019)
https://ok-lab.hatenablog.com/entry/2019/12/07/162608

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

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

Products the diary mentioned as alternatives

The diary names no alternative.

The custom builds discussed above include the thread-equipped resin example, revised sea-slug shape, two-purpose positioning wire, and vibrating multi-part chip (Prostate Alien). No matching product can be confirmed on the current list.

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Common worries about adding nylon thread to a vibrating chip

Readers asked about keeping the chip in position, concerns after breakage, and the cost of changing stopper arrangements.

"Can nylon thread help when vibration shifts the chip?"

In an entry published in February 2019, a customer said vibration made their recently purchased chips difficult to keep in position. After reading the earlier thread-and-stopper discussion, they asked for a similar custom arrangement. Mr. Okada said the requested specifications would appear in the custom-order section. The diary does not record whether that customer's positioning problem was resolved.

(Source: ok-lab's diary, published February 2019)
https://ok-lab.hatenablog.com/entry/2019/02/09/152257

"Can nylon thread address concerns after a homemade device breaks?"

In an entry published in June 2019, a customer reported surgery after a homemade device's joint failed. They requested a professionally made vibrating device with added thread and a stopper, citing concerns about cable durability and movement into the bladder.

Mr. Okada said he could not judge which design would best suit their preferences. His reply discussed several design categories without specifically resolving the thread-strength concern. The diary does not record whether this proposed thread-and-stopper build was completed.

(Source: ok-lab's diary, published June 2019)
https://ok-lab.hatenablog.com/entry/2019/06/15/144142

"What did changing the nylon thread stopper arrangement cost?"

In an entry published in February 2020, a customer requested a quotation for a ceramic vibrating chip with alternative stopper arrangements. Mr. Okada's basic quotation included a parallel cable stopper. Replacing that stopper with nylon thread and a sphincter stopper added ¥1,650 (about $11 at ¥156 = $1, rate as of 2026-09-04) to the basic quotation.

That figure covered a change between stopper arrangements, rather than a standalone thread purchase. The diary does not record whether the customer accepted this particular quotation.

(Source: ok-lab's diary, published February 2020)
https://ok-lab.hatenablog.com/entry/2020/02/29/155031

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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.