Can a prostate chip rotate? | Custom drills brought unresolved risks [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.
He founded OK Lab, a small company in Japan (Okada Comfortable Life Laboratory).
Only the entries about "prostate drills and piston drills" 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

• Early prostate drills raised concerns about uncontrolled travel, broken wires, and inconsistent movement.
• Mr. Okada revised the hardware while warning that the urethra's tolerance remained unknown.
• The supplied current product list has no confirmed match for these custom piston drills.

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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: prostate chip rotation

The OK Prostate Chip is a small device placed in the urethra (the urine passage) to act on the prostate. These custom prostate drills were intended to transmit movement to a tip near the prostate. The earlier design kept its motor outside the urethra. The later piston drill combined rotation and piston movement (back-and-forth travel), with a wire inside a supporting tube. No matching product can be confirmed on the current list.

The earliest prostate drill could travel dangerously far without a stopper

In an entry published in October 2021, Mr. Okada described a customer's failed attempt to alter an 8 mm motor that would not fit. The motor stopped working, and he suspected that its waterproofing had been lost. This prompted a drill design connecting an external motor, wire, and blue resin chip.

His first prototype had no stopper and could travel beyond the prostate, deep into the bladder. He called that design very dangerous. A later demonstration included a parallel wire stopper (a part intended to limit travel), which he said might make it slightly safer.

(Source: ok-lab's diary, published October 2021)
https://ok-lab.hatenablog.com/entry/2021/10/09/125823

The piston drill prototype depended on support around its thin wire

In an entry published in April 2026, Mr. Okada introduced a piston drill built around a sliding, rotating shaft (the inner wire). Its supporting tube measured 4 mm, and the moving wire was 0.4 mm or 0.5 mm. The stainless-steel screw prototype had a 20 cm tube and a 30 cm shaft, excluding its loop.

His blue resin screw prototype had a 25 cm tube and a 35 cm shaft, also excluding its loop. He reported that the wire alone lacked stiffness at the external urethral sphincter (not explained in the diary), making tube support necessary. Production was still too inconsistent for him to set a price.

(Source: ok-lab's diary, published April 2026)
https://ok-lab.hatenablog.com/entry/2026/04/04/122916

A redesigned piston drill sheath reduced reported resistance during bending

In an entry published in April 2026, a prototype request exposed inconsistent performance in the sheath (the structure guiding the shaft). Mr. Okada found differences between builds, with resistance changing between dry conditions, wet conditions, and different amounts of lubricating jelly. He requested more time, and the customer agreed, acknowledging that the order was for a prototype.

He replaced guides made from epoxy (not explained in the diary) with closely spaced, short aluminum pipes inside the tube. Previously, movement worsened sharply beyond roughly 90–110 degrees of bending; he reported smooth movement at about 180–270 degrees after the change. He still considered the method for securing those pipes unfinished.

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

The revised piston drill reached its first completed custom build

In an entry published in April 2026, Mr. Okada reported completing the first requested custom piston drill. It used the aluminum-pipe sheath design described the previous week. The diary does not record how this customer's device felt in use. Mr. Okada warned that a large rise in aluminum costs could affect the product's price.

(Source: ok-lab's diary, published April 2026)
https://ok-lab.hatenablog.com/entry/2026/04/25/122914

The reversible piston drill added another tip and a separate charge

In an entry published in May 2026, Mr. Okada presented a reversible piston drill, with a chip at each end of the sheath. He paired a screw-shaped chip with a more sharply shaped tip, nicknamed the devil chip. He described the screw's shape as milder and the other tip's shape as more demanding.

He intended the prototype as a gift to the illustrator who had supplied the design. Reversible construction added ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) tax excluded to the single-ended drill price, as published in May 2026. He specified that the chip itself remained an additional charge.

(Source: ok-lab's diary, published May 2026)
https://ok-lab.hatenablog.com/entry/2026/05/02/122917

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The maker's answer to prostate chip rotation

Mr. Okada revised the hardware, but explicitly questioned whether the urethra could tolerate the intended activity.

The prostate drill wire warning treated breakage as an expected problem

In an entry published in October 2021, Mr. Okada described a thread opening of about 1 mm in the blue resin tips. That opening could accommodate wire up to about 0.7 mm, but he considered that size too stiff for the urethra. His preference was 0.5 mm or thinner, because he was concerned about strain on the urine passage.

The parallel wire stopper was priced at ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) tax excluded in October 2021, with the wire diameter required for the order. Because he expected wires eventually to break, he recommended treating them as single-use parts.

(Source: ok-lab's diary, published October 2021)
https://ok-lab.hatenablog.com/entry/2021/10/09/125823

Piston drill warnings left the body's tolerance unresolved

In an entry published in April 2026, Mr. Okada said he did not know whether the human urethra could withstand the activity he envisaged. He also worried that damage near the prostate could remain unnoticed because the area was out of sight. He urged careful judgment about using the device, despite progress in its design.

(Source: ok-lab's diary, published April 2026)
https://ok-lab.hatenablog.com/entry/2026/04/04/122916

The twin-tip piston drill needed a less forceful wire connection

In an entry published in May 2026, Mr. Okada discussed resin tips joined by springy wire (wire tending to straighten again). He warned that a strongly bent 0.4 mm wire could exert enough restoring force on the resin to break the chip. For the custom twin screw-shaped tips, he instead used a 0.2 mm connecting wire.

The connection had epoxy on its surface and rubber adhesive inside, which he believed sealed the tips' thread openings. He considered the resin's limited strength a reason to reject the thicker wire for this connection.

(Source: ok-lab's diary, published May 2026)
https://ok-lab.hatenablog.com/entry/2026/05/09/122904

The piston drill sheath still admitted water after further changes

In another part of the entry published in May 2026, Mr. Okada described further changes to the sheath. Its individual aluminum pipes became shorter and more numerous, a design he said could tolerate stronger bends.

He distinguished the potentially sealed twin tips from the sheath, which could not be sealed because the wire needed to move. Water could pass through its interior, so he called for boiling disinfection.

(Source: ok-lab's diary, published May 2026)
https://ok-lab.hatenablog.com/entry/2026/05/09/122904

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How prostate chip rotation changed over time

The diary does not say what the current state is.

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OK Prostate Chip products related to prostate chip rotation

No current product is directly tied to this topic.

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Common worries about prostate chip rotation

The reader requests concerned slow rotation, rubbing, component prices, and custom tip combinations.

"Could prostate drills deliver slow rotation through long shafts?"

In an entry published in February 2022, a reader asked about a motor-driven rod approximately 25 cm long, reaching the prostate. They also asked whether a 5–10 cm version might be more practical if the longer shaft was difficult. Mr. Okada thought very slow rotation with enough turning force would be difficult with a toy motor.

He considered a rotary craft tool's flexible drive shaft (a bendable part transmitting rotation) a possible basis for the idea. His own tool could run very slowly, he wrote, but the diary does not record a completed version of this proposal. He suggested a gently shaped tip for the concept.

(Source: ok-lab's diary, published February 2022)
https://ok-lab.hatenablog.com/entry/2022/02/12/123441

"Would a piston drill reduce rubbing along the urine passage?"

In an entry published in April 2026, a reader wanted a sliding tip that would act near the prostate. The reader believed that enclosing the moving section might reduce rubbing and strain elsewhere in the urine passage. Mr. Okada welcomed the idea and temporarily paused another wire project to develop it.

The diary does not record whether the resulting device reduced rubbing for this customer. Mr. Okada favored a screw-shaped tip for rotation because he considered it the safest and most suitable shape for that purpose.

(Source: ok-lab's diary, published April 2026)
https://ok-lab.hatenablog.com/entry/2026/04/04/122916

"What did a custom piston drill cost?"

In an entry published in April 2026, a prototype request received a component quotation; Mr. Okada subsequently listed planned prices, all tax excluded. For the 20 cm version, a 0.4 mm shaft measuring 30 cm was ¥3,000 (about $19 at ¥156 = $1, rate as of 2026-09-04), and the sheath was ¥5,000 (about $32 at ¥156 = $1, rate as of 2026-09-04). For the 25 cm version, a 0.4 mm, 35 cm shaft was ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04), and the sheath was ¥7,000 (about $45 at ¥156 = $1, rate as of 2026-09-04).

A 0.5 mm shaft carried a ¥1,000 (about $6 at ¥156 = $1, rate as of 2026-09-04) increase: ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04) for 30 cm, or ¥5,000 (about $32 at ¥156 = $1, rate as of 2026-09-04) for 35 cm. These were proposed prices published in April 2026. Mr. Okada specified that the tip would cost extra at its usual price.

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

"Could a reversible piston drill have two screw-shaped tips?"

In an entry published in May 2026, a customer requested the reversible model and asked for a price quotation. Staff asked about the opposite tip, explaining that the displayed blue screw-shaped tip was size SS. The customer requested size S and two connected tips with no gap.

Staff initially said the proposed wire connection was difficult, then offered to try another method. The entry shows the completed custom build, but does not record the customer's experience with it.

(Source: ok-lab's diary, published May 2026)
https://ok-lab.hatenablog.com/entry/2026/05/09/122904

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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.