Can a homemade urethral toy cause bleeding or require surgery? | The diary reports both [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 bleeding and surgery involving homemade devices 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

The diary records bleeding, painful urination, hospital removal, and surgery involving homemade devices.

Mr. Okada suggested possible causes, but unexplained blood clots prompted him to recommend a urologist.

Some commercial products mentioned remain listed; the accounts do not establish that buying one prevents injury.

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: bleeding after homemade urethral toy use

The OK Prostate Chip is a small device placed in the urethra, the urine passage, to stimulate the prostate. The homemade versions discussed here were intended for similar stimulation, sometimes copying the shape of a commercial chip. The accounts include bleeding, a device coming apart inside the bladder, and a homemade stopper (a component intended to limit inward movement) used with a purchased chip.

A homemade urethral toy came apart inside the bladder, leading to surgery

In an entry published in May 2019, a customer described surgery after a homemade metal device's glued connection failed inside the bladder. The device was 5 cm long and had attached aquarium tubing; the customer subsequently bought an M-size glass chip, seeking something safer. They found the glass chip too thin to provide the hoped-for sensation, and it broke during cleaning about one week after purchase.

The customer asked for a more suitable product; the diary does not record a replacement or later outcome. No matching product can be confirmed on the current list. Mr. Okada apologized and proposed moving toward ceramic chips, with fewer size restrictions and a more flexible custom-order system.

(Source: ok-lab's diary, published May 2019)
https://ok-lab.hatenablog.com/entry/2019/05/04/162111

Repeated homemade chip use brought bleeding, severe pain, and inability to urinate

In an entry published in February 2020, a customer described repeated attempts with a homemade chip inspired by a commercial ceramic model. On February 26, a few blood drops and sharp pain preceded reported prostate-area placement, a dull ache, and bloody urine. Painful removal took about 20 minutes; afterward, urination brought intense, sharp pain and bloody urine.

On February 28, hours of painful insertion involved bleeding; inability to urinate, severe pain, and further bleeding during removal followed. Mr. Okada suggested bleeding might matter little for someone knowingly testing homemade devices, provided bacterial infection was avoided. This was his personal reassurance; the diary records no clinical assessment of those injuries.

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

Two homemade urethral toys required hospital removal, but their circumstances remain unknown

In an entry published in May 2020, Mr. Okada recorded 2 reports that homemade devices had fallen into the bladder and required hospital removal. He identified both devices as homemade, and said neither was an OK Lab product. According to Mr. Okada, the circumstances were unknown, which was why he had previously left these reports out of the diary.

The material does not record either device's construction, the hospital's removal method, or the customer's recovery. Mr. Okada's advice elsewhere in that entry, concerning a separate trapped-chip case, was to seek a urologist promptly.

(Source: ok-lab's diary, published May 2020)
https://ok-lab.hatenablog.com/entry/2020/05/02/131505

A homemade porcelain chip drew a bleeding report before maker testing

An entry published in October 2020 described an unused handmade porcelain chip sent by someone from a porcelain-producing area. The sender had made several chips for personal use, inspired by OK Lab's ceramic products. They reported slight bleeding when using a version without a glazed surface coating.

Mr. Okada wrote that the surface's friction appealed to him and predicted that his own use would probably not cause bleeding. His response proposed personal testing, but the material does not record that test's result or the sender's later recovery.

(Source: ok-lab's diary, published October 2020)
https://ok-lab.hatenablog.com/entry/2020/10/03/121700

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The maker's answer to bleeding after homemade urethral toy use

Mr. Okada cautioned about friction and force, and recommended a urologist when he could not explain blood clots.

Mr. Okada reported urethral injury from his rough ceramic test chip

In an entry published in June 2019, a customer reporting surgery after a homemade joint failed wanted stronger stimulation from a professionally made device. They requested a thicker vibrating chip, an additional retrieval thread (a thread for retrieving the device), and a stopper. Mr. Okada said personal preferences prevented him from confidently choosing the best approach.

Among his suggestions was a rough ceramic chip; he wrote that its strong friction had injured his own urethra. No matching product can be confirmed on the current list. His reply offered possibilities while emphasizing that he could not judge which would suit that customer.

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

For bleeding after use, Mr. Okada cautioned against force on dry tissue

In an entry published in February 2020, a different customer asked whether a chip that stopped partway should be forced farther. Mr. Okada suspected insufficient moisture, but acknowledged that other individual reasons could prevent progress.

He associated force against a dry urethral lining with bleeding; he did not establish why this particular customer's chip had stopped. The diary does not record whether the difficulty was resolved. Mr. Okada advised against forcing movement when the lining was dry.

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

Blood clots prompted medical referral because Mr. Okada could not explain them

In an October 2020 entry, a customer reported pain and blood clots with a medium-length twisted ceramic chip and homemade stopper. The stopper used epoxy putty (the diary does not explain this material), and later urine contained little visible blood. One week later, a health-check urine test showed blood (+) and white blood cells; the customer asked how long to rest.

Mr. Okada wrote that he had neither experienced blood clots nor received such reports, and could not judge the cause. He raised the possibility of another illness and wrote that an infection might not improve through rest alone. Mr. Okada advised seeing a urologist; the diary does not record a diagnosis or later recovery.

(Source: ok-lab's diary, published October 2020)
https://ok-lab.hatenablog.com/entry/2020/10/17/121023

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 bleeding after homemade urethral toy use changed over time

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OK Prostate Chip products related to bleeding after homemade urethral toy use

Current listings include products from these cases; their appearance here does not establish protection against bleeding or entrapment.

Products that appear in these entries

(Source: ok-lab's diary, published May 2020)
https://ok-lab.hatenablog.com/entry/2020/05/02/131505

(Source: ok-lab's diary, published October 2020)
https://ok-lab.hatenablog.com/entry/2020/10/17/121023

Products the diary mentioned as alternatives

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

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Common worries about bleeding after homemade urethral toy use

"Is homemade chip bleeding simply a beginner's problem?"

In an entry published in March 2019, a beginner asked about difficulty after a homemade resin chip caused bleeding. They reported making an aluminum replacement the following day; Mr. Okada replied that he considered the activity manageable with attention to cleanliness. His possible explanations for bleeding were projecting surface features, a material producing excessive friction, or an oversized chip.

He thought friction-related bleeding would settle within a few days, while a wound from a projecting feature could reopen. Those explanations were his assessment from correspondence; the diary does not record an examination or this customer's recovery. Mr. Okada suggested allowing more time when a wound from a projecting feature was suspected.

(Source: ok-lab's diary, published March 2019)
https://ok-lab.hatenablog.com/entry/2019/03/30/160657

"Does earlier homemade urethral toy use make advanced chips suitable?"

In an entry published in February 2020, a first-time buyer described an earlier homemade device made from an empty USB-type cable. They had stopped after 2 or 3 uses, following pain and bleeding during urination, and asked whether advanced commercial chips suited their experience. Mr. Okada initially based his answer on an assumed depth of earlier use; the customer's follow-up disputed that assumption.

He also questioned the buyer's proposed linked-chip arrangement, saying one stopper position might fail to prevent inward movement. He said he had not tested another proposed configuration and could not judge it from experience. Mr. Okada supported a stopper for standalone resin-chip use; the diary does not record whether that purchase resolved the customer's concerns.

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

"Can a chip get stuck even when nothing breaks?"

In an entry published in May 2020, a customer reported a purchased short twisted ceramic chip becoming trapped with a screw-shaped auxiliary chip. The retrieval thread remained intact, and the customer asked whether tangled thread could explain the difficulty. Mr. Okada initially suggested self-recovery approaches, then advised a urologist after the following morning brought no improvement.

The customer later reported that the device came out during urination, but it was lost and could not be inspected. Mr. Okada warned that the screw-shaped accessory did not function as a stopper for people prone to inward migration. He favored a single chip with an internal stopper, while acknowledging that prevention could not be guaranteed.

(Source: ok-lab's diary, published May 2020)
https://ok-lab.hatenablog.com/entry/2020/05/02/131505

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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.