Why does the chip look like sperm or a shoe? | Its shape reflects ideas and practical changes [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 "where the chip's sperm-like and shoe-like shapes came from" 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

Mr. Okada linked sperm imagery to an early concept; shoe-like shapes emerged during later development.

He reported changes to reinforcement, chip length, and motor housing in response to practical problems.

No current product is directly tied to this topic.

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: OK Prostate Chip design

The OK Prostate Chip is a small device placed in the urethra (the urine passage), intended to act on the prostate. Its design includes the body's shape and the thread that Mr. Okada compared to a sperm's tail. He connected the sperm image with an early concept, while shoe-like outlines emerged during work on resin and vibrating versions. Those later shapes concerned urine flow or the fit of a motor-equipped chip.

The sperm-inspired design began with a name before development started

Mr. Okada's entry published in October 2017 says the early glass chip's nickname (glass sperm) came before product development. He wanted the design to express the image behind that name, with an early version resembling a swimming sperm. In his account, the imagined movement ran inward toward the prostate, reversing the outward direction associated with ejaculation (the release of semen).

He linked that choice to the receptive sexual experience he wanted the product to suggest. Glass breakage posed a problem he had not solved, so he spent an extended period testing other materials. Mr. Okada writes that the original name gradually disappeared because it no longer described what those prototypes were made from.

(Source: ok-lab's diary, published October 2017)
https://ok-lab.hatenablog.com/entry/20171025/1508901076

A later sperm-inspired design illustration resembled an animal photograph by coincidence

In an entry published in October 2017, Mr. Okada compared a chip illustration with nautilus sperm (animal sperm pictured in the diary). The illustration showed the chip and thread curled around a finger, while the borrowed photograph showed the animal's sperm at a fingertip. Mr. Okada described the resemblance as coincidental, but strong enough to make him consider naming the chip after that animal.

(Source: ok-lab's diary, published October 2017)
https://ok-lab.hatenablog.com/entry/20171026/1508989298

The shoe-shaped resin chip accompanied a new claim about urination

The resin chip's shoe-like outline appeared in an entry published in March 2018. Mr. Okada had abandoned an earlier design proposal for that resin version.

He called the shoe-like form his best design at that stage. Mr. Okada claimed urine could pass without opening the external urethral sphincter (the muscle discussed in relation to urine control). The diary does not record a customer outcome for this prototype.

(Source: ok-lab's diary, published March 2018)
https://ok-lab.hatenablog.com/entry/20180310/1520672565

The separable chip design extended sperm imagery into connected components

An entry published in March 2018 describes a separable chip design, meaning a front component and a separate socket component. The front component had a sperm-shaped head, a thread tail, and a slender rod at the tail's end. The glass and resin front components each had about 1cm of thread beyond that rod.

The resin socket component had a sheath (a hollow receiving part) for the rod. Mr. Okada gave the parts male and female roles in his design story, describing the socket component as supporting the front component's progress.

(Source: ok-lab's diary, published March 2018)
https://ok-lab.hatenablog.com/entry/20180317/1521275320

A later chip design outlined the prostate using nylon threads

In an entry published in August 2021, Mr. Okada described a thread sculpture inspired by a new company logo. The logo prompted him to make a chip whose threads outlined the prostate. 4 threads formed that outline, with 1 nylon thread passing through its middle.

He compared the result to a walnut shape and emphasized that the outline had no solid mass. No matching product can be confirmed on the current list.

(Source: ok-lab's diary, published August 2021)
https://ok-lab.hatenablog.com/entry/2021/08/14/125815

Angel and devil chip designs depended on different visual references

In an entry published in December 2021, Mr. Okada described angel-inspired and devil-inspired designs requested by an illustrator. He writes that real wings gave him a reference for the angel design. He found the devil design harder to picture because, in his account, it came from his own imagination.

Mr. Okada planned to ask his ceramics teacher to make both designs the following month, while acknowledging that the teacher might decline. The diary does not record whether that planned ceramic production happened. No matching product can be confirmed on the current list.

(Source: ok-lab's diary, published December 2021)
https://ok-lab.hatenablog.com/entry/2021/12/11/124426

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The maker's answer to OK Prostate Chip design

Mr. Okada changed reinforcement, dimensions, and supporting parts in response to the limits he encountered.

The sperm-inspired glass design combined reinforcement with an embedded thread

In an entry published in October 2017, Mr. Okada described the glass body as a sperm's head and the nylon thread as its tail. That tail also had a stated practical role: nylon suture thread (stitching thread) ran through the epoxy resin (a protective coating). The coating covered the thin middle section, which he said could break under strong force.

According to Mr. Okada, the embedded thread was intended to keep broken sections linked, providing a retrieval safeguard. He presented the resin as a protective layer around the glass if the narrow section broke. Mr. Okada warns that these precautions cannot make glass completely safe.

(Source: ok-lab's diary, published October 2017)
https://ok-lab.hatenablog.com/entry/20171006/1507295400

Targeted protection allowed the early glass chip design to return

In an entry published in October 2017, Mr. Okada credited the narrow section's resin coating with making the original glass design ready for production. He considered this targeted protection effective enough to resume the glass design after trying other materials. The aim he described was protection at the moment of breakage; he did not claim the glass could never break.

No matching product can be confirmed on the current list. He explicitly warned against continued use after breakage.

(Source: ok-lab's diary, published October 2017)
https://ok-lab.hatenablog.com/entry/20171025/1508901076

Hospital removal prompted plans for a longer leading chip design

In an entry published in March 2018, a customer reported that a linked pair had become stuck and required hospital removal. The customer wanted to alert the maker, rather than seek compensation. Mr. Okada suspected a chip had turned around inside the urethra, but he could not confirm the circumstances.

He announced a change in the leading chip's length from roughly 25-28mm to at least 30mm. The diary does not record the pair's material or identify an exact current product. Mr. Okada cautions that individual differences might still allow a 30mm chip to turn around.

(Source: ok-lab's diary, published March 2018)
https://ok-lab.hatenablog.com/entry/20180310/1520672565

Snake-inspired chip design left the cable's supporting wire under investigation

An entry published in March 2022 describes Mr. Okada's vibrating chip (a motor-equipped device) and a striped cable. To Mr. Okada, the cable suggested a snake's body and the chip its raised head; he reported only modest stiffness in the wire-free version.

A separate version contained shape-holding wire (wire intended to retain a curve), aiming to combine flexibility with support. He reported rejecting nylon-coated wire because he thought the coating undermined the wire's advantages. No matching product can be confirmed on the current list. Mr. Okada says both wire type and thickness still needed careful consideration.

(Source: ok-lab's diary, published March 2022)
https://ok-lab.hatenablog.com/entry/2022/03/19/123203

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 OK Prostate Chip design changed over time

The diary does not say what the current state is.

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OK Prostate Chip products related to OK Prostate Chip design

No current product is directly tied to this topic.

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Common worries about OK Prostate Chip design

The customer requests concerned matching an existing outline, making crosswise bulges, and adapting a motor-equipped chip that would not fit.

"Could the resin chip shape match an earlier photograph?"

A separate customer request in an entry published in March 2018 concerned a resin pair with an extended leading tip. The customer wanted the design shown in an earlier diary photograph. Mr. Okada reports making a custom version with the same design but without a hollow interior.

The diary does not record how that custom version felt in use. No matching product can be confirmed on the current list.

(Source: ok-lab's diary, published March 2018)
https://ok-lab.hatenablog.com/entry/20180310/1520672565

"Could a custom chip shape have alternating crosswise bulges?"

In an entry published in July 2018, a customer wanted a cross-shaped glass chip with 3 equal bulges alternating by 90 degrees. Mr. Okada initially declined because his glassworking burner could not make the requested localized bends; his later test confirmed that limit. He instead offered a curved design with a wide, flat bulge, which he named after a cobra.

The diary does not record whether the customer received that alternative or how it felt in use. No matching product can be confirmed on the current list. Mr. Okada cautions that this alternative lacks the rotating action he attributes to the screw-shaped chip.

(Source: ok-lab's diary, published July 2018)
https://ok-lab.hatenablog.com/entry/20180721/1532152353

"Could a shoe-shaped chip solve the new motor's fit problem?"

In an entry published in August 2020, a customer said the vibrating chip with the new 10mm motor would not fit. Mr. Okada writes that roughly two hours of custom work produced a shape resembling a high-heeled pump. The diary does not record whether the customer could use the finished version.

He proposed the basic vibrating chip (fetal chip) price plus ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) (tax excluded), with a possible increase if the work became excessive. No matching product can be confirmed on the current list. Mr. Okada limited this offer to the new 10mm motor because other motors did not allow the heel shape.

(Source: ok-lab's diary, published August 2020)
https://ok-lab.hatenablog.com/entry/2020/08/01/124144

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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.