![Will the Zorro prostate chip stay in place? | The diary records fit and movement problems [OK Prostate Chip]](/img/a/T0597/eyecatch.svg)
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 the single-chip design (Zorro) and its earlier twin design 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
- Reports describe pressure from the joined twin, movement of the single chip, and concerns about parts becoming stuck.
- Mr. Okada describes support chips and flexible wire connections as ways to address movement.
- The current list includes standard resin, long resin, and stainless-steel versions at different prices.
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
| Term | Plain-English meaning |
|---|---|
| Twin chip | Two matching chip halves combined to increase thickness. |
| Single chip (Zorro) | One half of the original twin design, developed into a separate product for acting on the prostate. |
| Sphincter | A muscle that closes around the urine passage; the diary discusses its role in holding the assembly in position. |
| Screw support | An auxiliary chip intended to help support the main chip's position. |
| Two-thread fitting | An attachment arrangement using two threads to connect the chip. |
| Shape-memory wire | A flexible metal connector that retains a preset curve, used to link the main chip and supporting parts. |
| Bulbar urethral chip | A supporting piece in another part of the urine passage, linked to the main chip to help stabilize the assembly. |
| Hybrid attachment; shape-memory extension | Names of custom additions requested for a chip; their specific purposes: The diary does not explain this. |
What happens: Zorro prostate chip movement
The OK Prostate Chip is a device placed in the urethra, the urine passage, to act on the prostate. The single-chip design (Zorro) grew from a twin design intended to increase thickness by combining two matching halves. The diary discusses its shape, added supports, and movement within the urine passage near the prostate. Later entries describe a longer chip and flexible connections intended to improve how the assembly stays in place.
The titanium twin prostate chip became difficult to separate in June 2021
In an entry published in June 2021, Mr. Okada described a revised titanium twin intended for his own testing. Compared with the first version, it added 1mm of thickness and 2mm of width, with rounded corners.
The prototype measured 40mm long and 6mm wide, with a combined thickness of 7.5mm. Mr. Okada reported that its matching halves fitted so tightly that they did not separate easily.
This account concerns the joint between the halves; it does not describe a device trapped inside someone's body. No matching product can be confirmed on the current list.
(Source: ok-lab's diary, published June 2021)
https://ok-lab.hatenablog.com/entry/2021/06/12/125849
The joined titanium twin prostate chip put excessive pressure on Mr. Okada's urethra
In an entry published in July 2021, Mr. Okada said the connected titanium twin placed too much strain on his urethra. He could not leave that assembly in place for long.
He then described testing a single resin half instead of the joined titanium pair. According to his account, that resin half caused him no problems during approximately 3 days of continuous placement.
(Source: ok-lab's diary, published July 2021)
https://ok-lab.hatenablog.com/entry/2021/07/10/125840
Single use turned the twin prostate chip into a regular product
In an entry published in July 2021, Mr. Okada decided to commercialize a single half of the twin. He named it Zorro after the fictional hero and selected it as his first regular 3D-manufactured chip product.
He wrote that its uneven shape did not sit securely against the sphincter (the muscle closing around the urine passage). A screw support (an auxiliary positioning chip), with a 4mm gap, reportedly settled better in his trial.
The proposed resin chip cost ¥4,500 (about $29 at ¥156 = $1, rate as of 2026-09-04) excluding tax, with ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) for the thread connection and ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04) for the screw support. Mr. Okada therefore planned a chip-and-support set, priced at ¥8,000 (about $51 at ¥156 = $1, rate as of 2026-09-04) excluding tax in that entry.
(Source: ok-lab's diary, published July 2021)
https://ok-lab.hatenablog.com/entry/2021/07/24/125923
The resin Zorro prostate chip gained its own price in August 2021
An entry published in August 2021 announced that resin products would begin selling the following week. The single chip required a two-thread fitting (an attachment using two threads) and cost ¥5,000 (about $32 at ¥156 = $1, rate as of 2026-09-04) excluding tax, including ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) for thread.
The listed lengths were 36mm for S, 40mm for M, and 44mm for L. The M version measured 3mm thick away from its raised bumps.
For assemblies with a screw support, Mr. Okada offered separate choices of main-chip and support sizes. He also offered a choice of the spacing between those parts.
(Source: ok-lab's diary, published August 2021)
https://ok-lab.hatenablog.com/entry/2021/08/28/125823
The long Zorro prostate chip launched with separate dimensions and pricing
In an entry published in November 2021, the long resin single chip went on sale for ¥7,500 (about $48 at ¥156 = $1, rate as of 2026-09-04) excluding tax. Its published length was 50mm.
Its thickness was 3.1mm, increasing to 5mm at the raised bumps. The entry separately listed maximum width as 7.5mm and sideways width as 8mm.
(Source: ok-lab's diary, published November 2021)
https://ok-lab.hatenablog.com/entry/2021/11/20/125643
Two Zorro prostate chip custom additions carried separate charges in April 2025
In an entry published in April 2025, a customer requested a second-generation resin single chip with two custom additions. The request specified 40mm for a hybrid attachment and 40mm for a shape-memory extension.
Mr. Okada quoted an additional ¥5,500 (about $35 at ¥156 = $1, rate as of 2026-09-04) for the hybrid attachment and ¥3,300 (about $21 at ¥156 = $1, rate as of 2026-09-04) for the extension. The paragraph names these additions without explaining their construction or purpose.
The diary does not record whether this order was completed or how the requested assembly felt in use. No matching product can be confirmed on the current list.
(Source: ok-lab's diary, published April 2025)
https://ok-lab.hatenablog.com/entry/2025/04/26/122909
The maker's answer to Zorro prostate chip movement
Mr. Okada explored changes to shape, length, and supporting connections, while describing results from his own trials.
Proposed twin prostate chip offsets targeted width and length differently
In an entry published in March 2021, an illustrator asked whether offsetting the twin halves could create additional contours. Mr. Okada replied that the original purpose of the twin was increased thickness.
He proposed sideways offsets if customers wanted more width, but said lengthwise changes might be limited by the thread attachment points. He offered a lengthwise-offset prototype if that suited the illustrator's proposal, without promising a large increase.
(Source: ok-lab's diary, published March 2021)
https://ok-lab.hatenablog.com/entry/2021/03/20/130148
The long Zorro prostate chip stayed partly in place during Mr. Okada's trial
In an entry published in November 2021, Mr. Okada reported testing a longer single-chip prototype and requesting production. He said urination displaced it slightly, but its tip remained in the prostate's urine passage rather than being expelled completely.
He recalled the medium-length single chip moving outward more easily and suggested that the longer prototype's size explained the difference. Mr. Okada proposed the longer design for customers who felt the existing single chip lacked presence.
(Source: ok-lab's diary, published November 2021)
https://ok-lab.hatenablog.com/entry/2021/11/06/125812
Flexible wire gave the Zorro prostate chip a different support arrangement
An entry published in April 2024 describes shape-memory wire (a flexible metal connector) approximately 0.6mm thick, retaining a curve near 90 degrees. Mr. Okada said it straightened in the penile portion of the urine passage, allowing easier passage without unusual penile bulging.
He also thought its flexibility made becoming stuck during removal less likely, even after movement into the bladder. His design placed a bulbar urethral chip (a supporting piece in the urine passage) 3-5cm away from the sphincter.
He claimed this substantially reduced direct pressure on the sphincter because the separated parts supported each other. Mr. Okada presented wire linking as a way to improve stability compared with soft thread connections.
(Source: ok-lab's diary, published April 2024)
https://ok-lab.hatenablog.com/entry/2024/04/06/122941
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 Zorro prostate chip movement changed over time
| Published | What the diary said then |
|---|---|
| Mar 2021 | Digital design was commissioned for a technically demanding twin prototype. |
| Apr 2021 | The twin design aimed to join its halves without resin binding. |
| May 2021 | Matching male and female features were added after the first prototype separated easily. |
| Jun 2021 | Threads were embedded while a new hole-connection patent application remained pending. |
| Jul 2021 | The single half was selected for regular commercial production. |
| Aug 2021 | Resin versions offered separate choices of main-chip and support sizes. |
| Oct 2021 | The larger design raised production-cost concerns before its selling price was settled. |
| Nov 2021 | The long resin model was released. |
| Apr 2024 | Wire connections were intended to resist movement toward both the bladder and the outlet. |
| Apr 2026 | Mr. Okada suggested muscle contact could explain apparently swallowed thread. |
OK Prostate Chip products related to Zorro prostate chip movement
The current list gives prices for resin and steel chips and related accessories mentioned in these entries.
Products that appear in these entries
| Product (official name) | Price incl. tax | Relation to this topic |
|---|---|---|
| Standard resin single chip (OKプロステートチップ 凶悪ゾロ（生体適合樹脂）) | ¥5,500 (about $35 at ¥156 = $1, rate as of 2026-09-04) | The August 2021 entry announced the resin single chip with its own price and size choices. |
| Long resin single chip (OKプロステートチップ ロング凶悪ゾロ（生体適合樹脂）) | ¥8,250 (about $53 at ¥156 = $1, rate as of 2026-09-04) | The November 2021 release entry supplied the long model's dimensions and historical price. |
| Second-generation medium-length resin chip (OKプロステートチップ セミロングタイプ（第二世代生体適合樹脂）) | ¥6,050 (about $39 at ¥156 = $1, rate as of 2026-09-04) | The April 2026 question came from a customer using this model who reported displacement and poor urine flow. |
| Second-generation resin screw support (スクリュー型補助チップ追加オプション（第二世代生体適合樹脂）) | ¥3,500 (about $22 at ¥156 = $1, rate as of 2026-09-04) | The April 2026 customer had this support fitted when asking about position and movement. |
| Stainless-steel single chip (OKプロステートチップ 凶悪ゾロ（サージカルステンレス）) | ¥9,900 (about $63 at ¥156 = $1, rate as of 2026-09-04) | The April 2026 customer considered this model, prompting Mr. Okada's reply about weight and possible expulsion. |
| Connected second-generation two-thread safety accessory (二本糸用セーフティチップ（第二世代生体適合樹脂）接続オプション込み) | ¥2,300 (about $15 at ¥156 = $1, rate as of 2026-09-04) | The December 2025 prospective buyer requested this accessory as part of a custom double-stopper assembly. |
The standard resin single chip is listed in OK Lab's own online store.
The long resin single chip is listed in OK Lab's own online store.
(Source: ok-lab's diary, published August 2021)
https://ok-lab.hatenablog.com/entry/2021/08/28/125823
(Source: ok-lab's diary, published November 2021)
https://ok-lab.hatenablog.com/entry/2021/11/20/125643
(Source: ok-lab's diary, published December 2025)
https://ok-lab.hatenablog.com/entry/2025/12/06/122924
(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.
Common worries about Zorro prostate chip movement
The published questions concern connected versions, custom supports, and whether a heavier chip would behave differently.
"Could two long Zorro prostate chips be connected?"
In an entry published in October 2021, a caller wanted the long single chip released soon and asked about connecting two together. Mr. Okada replied that the long design existed, but a connected pair looked difficult.
He then proposed a possible arrangement involving additional screw-shaped connecting parts, before identifying limitations in that idea. It would not meet every requested spacing, and the diary does not record a completed connected pair.
(Source: ok-lab's diary, published October 2021)
https://ok-lab.hatenablog.com/entry/2021/10/23/125707
"Can a first Zorro prostate chip order include custom supports?"
In an entry published in December 2025, a prospective buyer wanted a video-shown single-chip assembly with double stoppers. The buyer reported finding accounts of bladder migration attributed to thinness and screw supports turning sideways and becoming impossible to remove.
They asked whether a first order could include that custom assembly and the connected second-generation two-thread safety accessory. Mr. Okada thanked the buyer and described material choices as efforts toward greater safety and comfort.
The published reply does not clearly answer the first-order question or record a later experience using the requested assembly. No matching product can be confirmed on the current list.
(Source: ok-lab's diary, published December 2025)
https://ok-lab.hatenablog.com/entry/2025/12/06/122924
"Does a stainless-steel Zorro prostate chip stay in place better?"
In an entry published in April 2026, a beginner using a second-generation medium-length resin chip reported displacement and markedly reduced urine flow. With a screw support fitted, the customer asked about the intended position and a future stainless-steel single chip.
Mr. Okada said single-chip users often kept the entire main chip in the prostate's urine passage, with only the support outside the sphincter. He thought stainless steel felt more noticeable because of its weight, but said that weight could also make expulsion easier.
He suggested that the sphincter might be gripping the support when urine flow was poor, without establishing this customer's actual position. The diary records no later outcome, and Mr. Okada cautioned that individual differences prevented a universal answer.
(Source: ok-lab's diary, published April 2026)
https://ok-lab.hatenablog.com/entry/2026/04/18/122906
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
| What you wanted to know | The answer |
|---|---|
| In short: does it stay in place? | The diary records pressure and movement problems, alongside proposed changes to supports. |
| What is the product? | A device placed in the urine passage to act on the prostate, made by OK Lab in Japan. |
| What do the terms mean? | The twin combines two halves; the single chip uses one, with optional supporting parts. |
| What happened during development? | A tightly joined titanium prototype led to single-chip commercialization, resin releases, and later custom assemblies. |
| What was the maker's answer? | Mr. Okada explored offsets, greater length, and flexible wire connections. |
| What changed over time? | Entries progressed from twin prototypes to commercial single chips and different approaches to support and movement. |
| What products are listed today? | The supplied list includes resin and steel chips, screw supports, and a connected safety accessory. |
| What remains uncertain in customer cases? | The supplied questions do not establish successful outcomes for the requested custom assemblies or the April 2026 positioning problem. |
| How do overseas purchases work? | The stated terms are advance PayPal payment, a ¥400 (about $3 at ¥156 = $1, rate as of 2026-09-04) handling fee, and additional Japan Post EMS shipping. |
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.
This article is a summary of the maker's development diary. The product is not a medical device and no result is guaranteed. If anything feels wrong or worries you, see a doctor. Prices, specifications and cautions change, so confirm the latest information on the official blog and the official site. Questions about ordering and shipping go to the seller.