Can a penis ring keep my prostate chip in place? | Results varied, and tightness caused problems [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 "loops or rings around the penis head" 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

• Rings sometimes limited chip movement, but the diary also records slipping, pain, and pressure-related problems.
• Mr. Okada proposed several external supports while warning about tightness, stiff wire, and prolonged contact.
• The current list includes a stocking ring, rim cushion, and slide-lock urethral holder.

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: keeping a prostate chip in place with a ring

The OK Prostate Chip is a device placed inside the urethra to act on the prostate, according to the maker. The external ring or loop sits near the glans rim (edge of the penis head) and connects with a thread or support. The intended purposes include limiting inward movement, restricting outward movement, and catching a chip that comes out. The diary records different results for different arrangements, including failures and discomfort.

A penis ring connected an adjustable thread to the early silicone prototype

In October 2017, Mr. Okada described a flexible silicone prototype connected to a stocking ring. Its overall length was about 13cm, and its thread length was adjustable at the bead.

He said the connection reduced the chance of losing the device and offered some control over excessive inward travel. Mr. Okada cautioned that rigid material would be dangerous at this length.

(Source: ok-lab's diary, published October 2017)
https://ok-lab.hatenablog.com/entry/20171022/1508644866

A penis ring limited inward movement after extra thread length failed

In May 2018, a customer reported that even a 25cm thread had not prevented the small end piece from disappearing inside. Their subsequent ring experiment reportedly prevented inward movement for about 6 hours.

The chip still came out during urination, although the customer said the ring prevented a fall into the toilet. Mr. Okada thanked them; his earlier advice had concerned a longer thread.

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

Mr. Okada favored an external glans loop after difficulty retrieving his chip

In January 2021, Mr. Okada reported a serious problem during tests of an extended stainless-wire connection. With surplus wire inside the urethra, the leading chip travelled into his bladder and became difficult to retrieve.

He said his external wire arrangement resisted outward movement during urination. Mr. Okada explicitly rejected keeping the surplus wire inside the urethra.

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

A thicker wire loop brought pain during Mr. Okada's test

In February 2021, a customer asked whether a thicker stainless-wire connection was possible. Mr. Okada lacked 0.6mm wire, so his reply described testing 0.7mm instead.

He reported prostate pain after about 4 hours. For all-day wear, Mr. Okada advised against wire measuring 0.5mm or more.

(Source: ok-lab's diary, published February 2021)
https://ok-lab.hatenablog.com/entry/2021/02/06/125245

The penis ring connection changed when silicone tubing replaced stocking material

In October 2023, Mr. Okada introduced a side-entry urethral holder (an external support for the chip's connection). He discontinued that holder's cotton-pearl ring connection and replaced it with 2mm silicone tubing around the glans rim.

The published price was ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Mr. Okada warned that the tubing could come out of its attachment holes.

(Source: ok-lab's diary, published October 2023)
https://ok-lab.hatenablog.com/entry/2023/10/21/123054

A nitinol wire loop became an extra-cost option during August 2025

In August 2025, Mr. Okada announced nitinol (shape-memory metal wire) connections as an option alongside nylon thread. The change from nylon cost an additional ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) excluding tax, with a maximum straight length of 35cm.

He described external-loop versions, including one whose loop could disappear if its tubing slipped off. Mr. Okada advised people concerned about wire breakage to wait before trying the new connection.

(Source: ok-lab's diary, published August 2025)
https://ok-lab.hatenablog.com/entry/2025/08/09/122924

An elastic glans loop slipped off despite its intended anchoring role

In November 2025, Mr. Okada reported that a nitinol loop could spring off the penis head easily. The 20mm–30mm loop discussed in that entry belonged to a proposed internal arrangement.

He said nitinol itself supplied elasticity, unlike the nylon loop design discussed the previous week. Mr. Okada therefore saw no reason to enlarge this loop for anchoring around the glans.

(Source: ok-lab's diary, published November 2025)
https://ok-lab.hatenablog.com/entry/2025/11/01/122937

Jointed support still needed a penis ring or separate external holder

In November 2025, Mr. Okada described a jointed nitinol-and-nylon support (a segmented connection supporting the chip). He considered it easier to insert but prone to slipping outward.

He said chip shape and resistance from additional parts affected how well it stayed in place. Mr. Okada proposed external ring support and suggested a separate holder might be necessary to hold the assembly firmly.

(Source: ok-lab's diary, published November 2025)
https://ok-lab.hatenablog.com/entry/2025/11/29/122908

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The maker's answer to keeping a prostate chip in place with a ring

Mr. Okada's replies address several different problems, with cautions about pressure, stiffness, and prolonged contact.

A penis ring's stopping effect came with warnings about excessive pressure

In June 2019, Mr. Okada described light ring pressure at the penis base as a possible barrier against outward chip movement. His discussion concerned ceramic chips with curved ends.

He also warned that prolonged, strong constriction could cause tissue death. Mr. Okada cautioned against tight pressure during extended wear.

(Source: ok-lab's diary, published June 2019)
https://ok-lab.hatenablog.com/entry/2019/06/01/155432

Rubber-band glans loops received qualified support alongside warnings about tightness

In May 2022, a customer described an external rubber-band attachment on a custom ceramic assembly. They reported a steadier chip position and less worry about inward travel toward the bladder.

Mr. Okada thought the general idea might work with moderate tension. His reply expressly warned that an excessively tight rubber band was dangerous.

(Source: ok-lab's diary, published May 2022)
https://ok-lab.hatenablog.com/entry/2022/05/07/123013

A penis ring could not resolve every stiffness or contact problem

In August 2022, a customer asked which support suited several days of wear. Mr. Okada said his 6-wire support (a bendable chip-support connection) needed repositioning after roughly half a day. He considered continuous wear impractical.

He preferred the flexibility of the silicone-tube assembly but acknowledged possible damage from sustained contact with the same area of urethral lining. His caution also concerned the urethral sphincter (a muscle around the urine passage). Mr. Okada advised against prolonged tube contact there, or tubing extending beyond it during long wear.

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

A penis ring was suggested because jointed support lacked slip prevention

In May 2023, a customer reported that their vibrating device slipped outward during use. Mr. Okada replied that its 2-wire jointed support had no structure specifically preventing this movement.

The diary does not record whether the proposed support solved the customer's problem. Mr. Okada suggested external support, including a lightly fitted ring.

(Source: ok-lab's diary, published May 2023)
https://ok-lab.hatenablog.com/entry/2023/05/27/122912

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 keeping a prostate chip in place with a ring changed over time

The diary does not say what the current state is.

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OK Prostate Chip products related to keeping a prostate chip in place with a ring

The current list includes standalone rings and a slide-lock holder, alongside chips mentioned in these cases.

Products that appear in these entries

The stocking ring is listed in the company's own online store.

The slide-lock urethral holder is listed in the company's own online store.

(Source: ok-lab's diary, published October 2017)
https://ok-lab.hatenablog.com/entry/20171022/1508644866

(Source: ok-lab's diary, published November 2020)
https://ok-lab.hatenablog.com/entry/2020/11/07/121125

(Source: ok-lab's diary, published October 2023)
https://ok-lab.hatenablog.com/entry/2023/10/28/122832

Products the diary mentioned as alternatives

The glans-rim cushion is listed in the company's own online store.

(Source: ok-lab's diary, published June 2019)
https://ok-lab.hatenablog.com/entry/2019/06/01/155432

Historical silicone prototypes and custom glass, wire, cord, and jointed assemblies: No matching product can be confirmed on the current list.

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Common worries about keeping a prostate chip in place with a ring

The diary distinguishes catching an expelled chip from maintaining its position and finding a comfortable fit.

"Can a penis ring stop my chip moving during urination?"

In April 2019, a customer asked how to keep their glass screw-shaped chip in its preferred position during urination. Mr. Okada discussed a firmer cable connection because the existing chip used nylon thread.

He considered external cable anchoring promising, but the diary does not record this customer's result. Mr. Okada suggested a cable connection with ring support as a possible response to the problem.

(Source: ok-lab's diary, published April 2019)
https://ok-lab.hatenablog.com/entry/2019/04/27/153239

"Will every type of glans loop feel equally flexible?"

In February 2023, a customer asked about loop function and the relative safety of different connections. Mr. Okada favored the metal-reinforced silicone-covered nylon connection when discussing hospital-related concerns.

However, he said its extra stiffness could make a glans loop difficult for some people. For this external-loop purpose, Mr. Okada described the softer silicone-covered nylon cord as comfortable.

(Source: ok-lab's diary, published February 2023)
https://ok-lab.hatenablog.com/entry/2023/02/18/122910

"Can fixed-size penis rings hold a chip securely?"

In February 2024, a customer proposed rigid card rings (rings for bundling word cards) because their chip moved in both directions. Mr. Okada's reply drew on his tests with silicone and stocking rings. He reported blisters with prolonged tightness, while looser settings allowed the internal stopper to pass the ring.

He considered the proposal possible in principle and offered a custom tail-and-helper arrangement. The diary does not record whether the proposed order went ahead. Mr. Okada cautioned that maintaining suitable pressure had proved impossible in his tests as penis size changed.

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

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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.