Can a resin chip stick inside the urethra? | The maker reports sticking, especially during long wear [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 "resin chips sticking to the urethral lining" 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.

---

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

Mr. Okada and a customer linked resin sticking during longer wear to difficult removal, discomfort, or bleeding.

The maker explored screw shapes, vibration, and aluminum surfaces, while continuing to caution against prolonged resin use.

The current list includes a resin screw chip and ceramic semi-long chip; later diary entries still contain cautions.

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.

---

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.

---

Before you read: key terms

---

What happens: resin chip sticking inside the urethra

The OK Prostate Chip is a small device placed in the urethra (the urine passage) to stimulate the prostate. Resin is one material used for its body, which sits against the passage's inner lining. In these entries, resin sticking means the drying and clinging that Mr. Okada or customers suspected during longer wear. The diary describes changes to the chip's shape, surface, and vibration intended to address that contact problem.

Hollow resin sticking kept Mr. Okada's proposed designs off sale

In an entry published in February 2018, Mr. Okada described hollow resin chips becoming difficult to remove after about half a day. He suspected urine flowing through their centers left the outside dry and stuck against the urethral wall. He eventually removed the device and reported a normal examination by a urologist.

According to Mr. Okada, the doctor explicitly rejected his suggestion that the examination proved the chip safe. Mr. Okada concluded that hollow chips connected outside only by retrieval thread (the thin line for removal) risked particularly difficult extraction. His decision was to withhold even the version with only a hollow second chip until he could address surface drying.

(Source: ok-lab's diary, published February 2018)
https://ok-lab.hatenablog.com/entry/20180228/1519809422

A customer suspected resin sticking caused more bleeding than glass

In an entry published in March 2018, a customer reported more bleeding and pain with a custom resin chip than glass during prolonged use. The customer suspected the second resin chip dried out and stuck, making it the main source of those symptoms. The diary does not record a diagnosis confirming that explanation.

The customer then requested a single-chip custom design with a curved tip and a pronounced narrowing near the rear. The diary does not record how the revised design felt in use. Mr. Okada advised changing the requested 4cm length to 5cm, because the curve and rear narrowing would not fit into the shorter design.

(Source: ok-lab's diary, published March 2018)
https://ok-lab.hatenablog.com/entry/20180331/1522485734

Mr. Okada reported less resin sticking with the screw design

In an entry published in July 2018, Mr. Okada said earlier flat resin chips could cling to one location and damage the urethral lining. He associated drying with difficult removal, even when those chips initially felt comfortable. His earlier discomfort had appeared after about half a day, so he delayed reporting enthusiasm for the new design.

He then reported one week of continuous wear with the resin screw chip, without problems. He also considered its smoothness comparable to glass, although this was his personal experience. Mr. Okada therefore favored resin for short chips that could have a screw shape (a twisted design intended to address sticking).

(Source: ok-lab's diary, published July 2018)
https://ok-lab.hatenablog.com/entry/20180714/1531551648

Resin sticking concerns kept the nonvibrating long model off sale

In an entry published in February 2019, Mr. Okada explained why he was not selling nonvibrating resin long chips. He considered them problematic because he experienced discomfort after about half a day without vibration. His account linked that discomfort to the drying he associated with resin.

He believed vibration largely prevented drying and sticking, but said the dual-motor model's stimulation was too strong to sustain all day. He treated that model as intended for short sessions, despite discussing its suitability for continuous wear when switched off. For longer wear, Mr. Okada favored an ordinary single-motor vibrating chip over the dual-motor design.

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

A customer's preference did not remove Mr. Okada's resin sticking concerns

In an entry published in March 2022, a customer preferred white resin after trying glass, ceramic, and an unidentified blue chip. The customer found ceramic too slippery and the blue chip too firmly gripping, while white resin offered a preferred balance. They requested a larger white resin screw chip, approximately 35–38 mm long and 10–13 mm at its widest.

Mr. Okada accepted the comparison and reconsidered resin's appeal for stability. The diary does not record the customer's experience with the requested larger chip. He still discouraged wholly white resin designs other than screw shapes, because he considered them prone to sticking.

(Source: ok-lab's diary, published March 2022)
https://ok-lab.hatenablog.com/entry/2022/03/05/123200

---

The maker's answer to resin chip sticking inside the urethra

Mr. Okada proposed changes to shape, movement, and surface contact; his diary reports personal tests rather than established safety.

Mr. Okada proposed vibration as another answer to resin sticking

In an entry published in December 2018, Mr. Okada presented vibration as a further answer after screw shapes reduced sticking. He claimed movement separated the chip from the lining, and that intermittent vibration eliminated the problem. He also reported easier removal of larger vibrating chips. Mr. Okada proposed vibrating designs for resin sticking; the diary does not record an independent safety assessment.

(Source: ok-lab's diary, published December 2018)
https://ok-lab.hatenablog.com/entry/20181222/1545459719

An aluminum surface offered Mr. Okada another possible answer to resin sticking

In an entry published in February 2019, Mr. Okada tested an aluminum-covered resin prototype without electrical power. It carried electrodes (metal contacts for electrical stimulation), but his test addressed physical contact with the urethra. He reported no problems during 15 hours of continuous wear on each of 2 days, with removal as smooth as glass.

The test piece was 70mm long, with a 10mm tip, 12mm middle bulge, and a 10mm rear end. It was separate from the customer's requested electrode chip, whose experience after delivery is not recorded. Mr. Okada considered aluminum covering on raised areas one possible answer to resin sticking.

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

Tip-motor designs retained Mr. Okada's distinction between vibration and resin sticking

In an entry published in January 2020, Mr. Okada introduced custom resin chips with the motor at the tip. He said resin allowed an internal cable route that was not possible with ceramic.

The plain short vibrating model cost ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04), and the twisted vibrating model cost ¥6,000 (about $38 at ¥156 = $1, rate as of 2026-09-04), both tax excluded as published then. An extra screw-shaped chip cost ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04), tax excluded, for either model.

Both designs were custom orders then, and he reported comfortable use of the plain short model with the extra chip. Mr. Okada favored vibrating resin models over ordinary resin chips, which he continued to discourage because of sticking.

(Source: ok-lab's diary, published January 2020)
https://ok-lab.hatenablog.com/entry/2020/01/04/155235

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.

---

How resin chip sticking inside the urethra changed over time

---

OK Prostate Chip products related to resin chip sticking inside the urethra

Current listings include resin models discussed here and the ceramic alternative Mr. Okada suggested.

Products that appear in these entries

The single resin screw chip is listed in the company's own online store.

The separate resin support chip 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

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

Products the diary mentioned as alternatives

The ceramic semi-long chip 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

The diary also covers hollow prototypes and custom resin chips in narrow, semi-long, and oversized screw forms. It describes an aluminum test piece and custom tip-motor models too. No matching product can be confirmed on the current list.

---

Common worries about resin chip sticking inside the urethra

Mr. Okada linked sticking to dryness and longer wear, but his replies do not establish a safe duration.

"Can resin sticking happen during short use?"

In an entry published in June 2019, a customer worried about glass asked whether a semi-long chip could be made from resin. Mr. Okada agreed and quoted ¥3,240 (about $21 at ¥156 = $1, rate as of 2026-09-04) for the custom resin version. He said sticking sometimes occurred after about half a day or longer, while describing short use as unproblematic.

That was his assessment; the diary does not record a medically established safe duration. The customer replied that they would wait for ceramic and might also wait for other customers' reports. Mr. Okada favored waiting for the ceramic semi-long design he expected that June instead of ordering the resin custom.

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

"Does resin sticking rule out 24-hour wear?"

In an entry published in February 2020, a buyer asked about continuous resin use extending to 24 hours. Mr. Okada discouraged that duration, despite citing a separate customer's one-week resin screw-chip report. He described his own resin vibrating chip developing discomfort after about 10 hours without vibration, which he attributed to sticking.

He reported relief with vibration and later said ceramic and glass had no time limit; these were his personal judgments. The diary does not record the buyer's outcome with the ordered resin part or clinical evidence establishing a safe duration. Mr. Okada's advice to the buyer remained against continuous, day-long resin use.

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

"Could dryness explain why my chip won't go in?"

In a separate exchange published in February 2020, a customer said a newly acquired chip would not move farther inside. The customer asked whether forcing it was a bad idea. Mr. Okada suspected insufficient moisture was the most common explanation, while acknowledging that other individual reasons could be involved.

The diary does not record whether the difficulty was resolved. Mr. Okada warned that forcing movement against dry tissue could cause bleeding, and advised against doing so.

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

---

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.

---

Summary of this article

---

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.