Can I use urethral and anal toys together? | The diary reports injuries and shifting chips [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 "using urethral and anal devices together" 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

• Combined stimulation has been followed by bleeding, injury, and movement of the urethral chip.
• Mr. Okada has advised limiting combined use and warned against forcing a displaced chip.
• Related ceramic products remain listed, but several later custom designs have no confirmed current match.

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: using urethral and anal toys together

The OK Prostate Chip is a small device placed in the urethra (the urine passage) to act on the prostate. Combined stimulation means pairing it with an anal prostate massager or dildo to apply pressure from different directions. The anal device sits in the rectum (the passage reached through the anus), while the chip sits on the urethral side. Mr. Okada describes this arrangement as pressure around the prostate from inside and behind it.

An injury prompted a flexible design intended for combined stimulation

An entry published in December 2017 reports sphincter injury after a tester wore the long prototype continuously, 24 hours daily, for several days. Mr. Okada's own test had included overnight breaks. He responded with linked chips separated by about 10 mm of thread at the sphincter (a muscle controlling the passage).

Mr. Okada expected that flexible section to reduce strain when anal pressure changed the prostate's angle. He had not tested the combination with a dildo. His long-model recommendation was limited to short sessions.

(Source: ok-lab's diary, published December 2017)
https://ok-lab.hatenablog.com/entry/20171231/1514712104

An irregular heartbeat ended Mr. Okada's combined stimulation test

In an entry published in October 2018, Mr. Okada reported a severe irregular heartbeat immediately after trying combined stimulation. He described it as 3-point stimulation, involving pressure from both the urethral and rectal sides. He removed the urethral chip after the episode. Mr. Okada wrote that he planned a break from anal stimulation.

(Source: ok-lab's diary, published October 2018)
https://ok-lab.hatenablog.com/entry/20181013/1539409481

Combined stimulation pushed a urethral chip away from the prostate

In an entry published in November 2018, Mr. Okada described displacement during exercise with both devices present. An anal chip held by a support garment pushed his urethral chip into the bulbar urethra (the section below the prostate). Mr. Okada advised against resisting that displacement and favored relief of pressure if pain developed.

(Source: ok-lab's diary, published November 2018)
https://ok-lab.hatenablog.com/entry/20181110/1541826499

A wire break ended one stainless design used for combined stimulation

An entry published in September 2022 records a repair request after a stainless chip's support wire broke during its third use. Staff accepted the failure as an initial defect. Mr. Okada described an uneventful combined-use test himself, but stopped accepting orders for that particular stainless construction after the customer's failure.

The diary does not record whether this customer's repair was completed. Mr. Okada offered existing owners a different connection, including for devices already used.

(Source: ok-lab's diary, published September 2022)
https://ok-lab.hatenablog.com/entry/2022/09/24/122837

Heavy bleeding prompted a warning about rigid supports during combined stimulation

In an entry published in October 2022, a customer reported heavy bleeding after pairing a custom chip with a tapping anal prostate massager. The chip had 3 motors and 2 electrodes (electrical contacts), with a rigid supporting cable. The customer requested a different anal chip after this experience.

The diary does not record how that replacement combination felt. Mr. Okada advised against combining the rigid cable with even the silicone-covered aluminum anal chip.

(Source: ok-lab's diary, published October 2022)
https://ok-lab.hatenablog.com/entry/2022/10/08/122859

A spring-linked prototype intended for combined stimulation moved toward the bladder

In an entry published in March 2024, Mr. Okada tested a ceramic pair joined by spring wire. He hoped it would oppose pressure from an anal device. Instead, he reported movement of more than 3 cm toward the bladder with almost no applied force.

An external stopper (a stop outside the urethral opening) limited further travel in his test. He cautioned that the slippery prototype might be unsuitable for staying in one position.

(Source: ok-lab's diary, published March 2024)
https://ok-lab.hatenablog.com/entry/2024/03/16/123023

A bladder near miss brought another warning about combined stimulation

In an entry published in March 2025, a customer explained a previously reported near miss involving movement toward the bladder. They attributed it to vigorous activity with a silicone dildo approximately 3.5 cm in diameter. Mr. Okada said rectal pressure could propel the urethral chip toward the bladder.

The customer said they intended to take more care in future. Mr. Okada advised an external stopper for combined use.

(Source: ok-lab's diary, published March 2025)
https://ok-lab.hatenablog.com/entry/2025/03/22/122906

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The maker's answer to using urethral and anal toys together

The maker's responses include limits on combined use, warnings about displacement, and experimental changes to supports.

Mr. Okada warned that electrical combined stimulation could be life-threatening

In an entry published in December 2018, a customer requested an anal chip with 2 electrodes. Mr. Okada warned that fluid inside the rectum could change current flow, with enema fluid potentially creating a short circuit. OK Lab would not accept electrode orders from people without prior experience of the stimulation equipment. Mr. Okada cautioned that the amount of current could be life-threatening.

(Source: ok-lab's diary, published December 2018)
https://ok-lab.hatenablog.com/entry/20181208/1544250742

The draft manual warned against combined stimulation with anal prostate massagers

An entry published in July 2021 introduced a draft instruction manual. It warned of a strong shock from pairing the chip with an anal prostate massager. The manual advised avoiding that pairing as much as possible.

(Source: ok-lab's diary, published July 2021)
https://ok-lab.hatenablog.com/entry/2021/07/24/125923

Integrated stoppers targeted movement in both directions during combined stimulation

An entry published in October 2025 described stops attached directly to the chip. Mr. Okada reported that they prevented movement toward the bladder and displacement during urination. They used shape-memory wire (wire that returns to its original shape).

The historical add-on price was ¥3,000, (about $19 at ¥156 = $1, rate as of 2026-09-04) tax excluded, for the outer-sphincter stop alone. Stops on both sides cost ¥5,000, (about $32 at ¥156 = $1, rate as of 2026-09-04) tax excluded, as published in October 2025. For ceramic versions, Mr. Okada required reinforcement intended to prevent breakage.

(Source: ok-lab's diary, published October 2025)
https://ok-lab.hatenablog.com/entry/2025/10/04/122910

A fine-wire design offered another proposed approach to combined stimulation

In an entry published in May 2026, Mr. Okada described a fine-wire urethral device. Reported dimensions were 1 mm in diameter and 40 mm across the opened wings. He claimed it imposed almost no opposing pressure from the urethral side.

The diary does not record a customer's outcome from combining this device with an anal massager. Mr. Okada suggested it as an option when a solid chip made pressure from both sides excessive.

(Source: ok-lab's diary, published May 2026)
https://ok-lab.hatenablog.com/entry/2026/05/23/122904

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 using urethral and anal toys together changed over time

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OK Prostate Chip products related to using urethral and anal toys together

The current list includes ceramic products mentioned in reports of combined stimulation.

Products that appear in these entries

(Source: ok-lab's diary, published July 2022)
https://ok-lab.hatenablog.com/entry/2022/07/09/123142

(Source: ok-lab's diary, published April 2026)
https://ok-lab.hatenablog.com/entry/2026/04/18/122906

Products the diary mentioned as alternatives

The diary names no alternative.

Early long or linked prototypes; custom electrode assemblies; aluminum anal chips: No matching product can be confirmed on the current list.

Custom frames; spring-linked, integrated-stopper, flexible-joint, chipless, and fine-wire designs: No matching product can be confirmed on the current list.

The particular stainless wire-supported construction discussed in September 2022 was discontinued.

(Source: ok-lab's diary, published September 2022)
https://ok-lab.hatenablog.com/entry/2022/09/24/122837

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Common worries about using urethral and anal toys together

Readers asked about weak sensations, injury, movement toward the bladder, and bleeding that continued after use.

"Could combined stimulation help when the chip feels weak?"

An entry published in February 2019 records a customer seeking more sensation from a urethral chip. They asked whether an anal massager would help, and whether pressure could hurt or break the glass. The diary does not record an outcome from combined use for this customer. Mr. Okada declined specific advice because he felt anatomical differences made a reliable answer impossible.

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

"Can combined stimulation cause an injury?"

An entry published in February 2020 records a reader asking whether anal pressure alongside a chip could cause injury. Mr. Okada said reports ranged from unsuccessful combinations to combinations customers felt worked. In a follow-up, that customer reported bleeding, severe pain, and inability to urinate with a homemade chip during combined stimulation.

His later reply minimized the bleeding without confirming what caused it. The diary does not record a medical assessment or recovery from this episode. Mr. Okada's initial advice was that people unable to restrain themselves should avoid combined stimulation.

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

"Can combined stimulation push a chip into the bladder?"

A customer in an entry published in May 2021 asked whether simultaneous anal stimulation had displaced the chip or its stopper. They reported unwanted urine release during the combination. Mr. Okada suspected that the chip, possibly including its stopper, had moved into the bladder.

The diary does not record a confirmed location or subsequent outcome for this customer. Mr. Okada warned that repeated anal-massager movement could shift the chip outward or inward, preventing it from staying at the prostate.

(Source: ok-lab's diary, published May 2021)
https://ok-lab.hatenablog.com/entry/2021/05/29/125928

"Will bleeding after combined stimulation stop without a doctor?"

A reader in an entry published in August 2023 asked whether continuing bleeding after combined stimulation required a doctor. They reported severe pain during urination after vigorous activity with an electrode chip and a dildo. Staff replied that they could not judge the condition from the messages.

A follow-up said bleeding stopped after 3 days, on the morning of the intended medical visit. The diary does not record whether the consultation happened. OK Lab's staff advised early medical assessment for safety.

(Source: ok-lab's diary, published August 2023)
https://ok-lab.hatenablog.com/entry/2023/08/05/122956

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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.