Shenzhen Meijiale Technology Co Ltd v. Hyperice IP Subco LLC

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Shenzhen Meijiale Technology Co., Ltd. (People's Republic of China)
  • Defendant: Hyperice IP Subco, LLC (Delaware)
  • Plaintiff’s Counsel: Glacier Law LLP
• Case Identification: 2:26-cv-03579, W.D. Wash., 09/23/2026
• Venue Allegations: Venue is asserted based on Defendant's use of Amazon's patent enforcement process, which allegedly creates a substantial connection to the district, in part through contractual provisions selecting Washington law and courts.
• Core Dispute: Plaintiff seeks a declaratory judgment that its percussion massager does not infringe Defendant’s patent related to a quick-connect mechanism for massage heads, and/or that the patent claims are invalid.
• Technical Context: The lawsuit concerns the technology of hand-held electronic percussive massage devices, a product category popular for personal therapeutic use and muscle recovery.
• Key Procedural History: This action was initiated in response to Defendant's infringement accusation against Plaintiff's product via the Amazon Patent Evaluation Express (APEX) program. The complaint notes that a key claim limitation was previously construed in a Patent Trial and Appeal Board (PTAB) proceeding (PGR2025-00013), the final decision of which is currently on appeal to the U.S. Court of Appeals for the Federal Circuit. The patent-in-suit is subject to a terminal disclaimer, and its claim 17 has been statutorily disclaimed.

Case Timeline

Date	Event
2013-07-01	'082 Patent Priority Date
2024-03-26	'082 Patent Issue Date
2026-05-11	PTAB issues Final Written Decision in PGR2025-00013
2026-06-17	Federal Circuit appeal filed for PGR decision
2026-09-09	Hyperice executes APEX Agreement
2026-09-10	Amazon notifies Plaintiff of APEX assertion
2026-09-23	Complaint Filed

II. Technology and Patent(s)-in-Suit Analysis

U.S. Patent No. 11,938,082 - Massage Device Having Variable Stroke Length

• Patent Identification: U.S. Patent No. 11,938,082, "Massage Device Having Variable Stroke Length," issued March 26, 2024 (the “’082 Patent”).

The Invention Explained

• Problem Addressed: The patent’s background section states that prior art massaging devices can be "bulky, get very hot, are noisy and/or are difficult to use for extended periods of time" ’082 Patent, col. 1:29-34
• The Patented Solution: The invention is a percussive massage device designed to address these deficiencies. A central feature highlighted in the complaint is a "quick-connect system" that allows a user to attach or detach a massaging head from the device's reciprocating piston, even while the piston is in motion ’082 Patent, col. 10:5-15 The specification describes embodiments using magnets to achieve this quick-release functionality, along with a tapered or rounded head design to "easily slip into the opening" during operation ’082 Patent, col. 6:57-65 ’082 Patent, col. 7:8-12
• Technical Importance: This "hot-swapping" capability for massage heads allows for more convenient and uninterrupted use, as a user can switch between different head types for various muscle groups without stopping the device ’082 Patent, col. 6:50-57

Key Claims at a Glance

• The complaint’s non-infringement analysis centers on limitations found in independent claim 1, which are incorporated into dependent claim 7, the claim specifically identified by the Defendant in the APEX proceeding Compl. ¶7 Compl. ¶¶14-15 The complaint also addresses independent claim 18 Compl. ¶27
• The essential elements of independent claim 1 are:
  • a housing;
  • a piston with a bore at its distal end;
  • a motor to make the piston reciprocate at a first speed;
  • a drive mechanism controlling a predetermined stroke length; and
  • a quick-connect system with a massaging head, where the system is "configured to have a proximal end of the first massaging head inserted into or removed from the bore while the piston reciprocates."
• The complaint notes that claims 2 through 16 depend on claim 1 and that it reserves all non-infringement positions regarding other claim limitations Compl. ¶26 Compl. ¶28

III. The Accused Instrumentality

Product Identification

• Product Identification: A percussion massager sold by Plaintiff on Amazon.com, identified by ASIN B0BFF9N6QQ (the "Accused Product") Compl. ¶1

Functionality and Market Context

• The Accused Product is a hand-held percussion massager Compl. ¶20 The complaint focuses on the product’s "massaging-head retention interface," which it describes as a "mechanical interference-fit connection" Compl. ¶3
• This connection mechanism allegedly functions by using an "elastic fit ring on the massaging-head shaft" that is held within the piston's bore by "radial interference and friction" Compl. ¶3 Compl. ¶20 Plaintiff alleges that attaching or detaching the massage head requires "deliberate axial force" and that the interface is not "specially designed or adapted for controlled insertion or removal during piston reciprocation" Compl. ¶3 Compl. ¶22
• No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

'082 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Non-Infringing Functionality	Complaint Citation	Patent Citation
a housing	The complaint does not dispute this element.	¶28	col. 3:36-39
a piston having a proximal end and a distal end, the distal end of the piston having a bore	The complaint does not dispute this element, but describes the bore as part of a friction-fit interface.	¶3; ¶28	col. 6:58-61
a motor operatively connected to the proximal end of the piston, wherein the motor is configured to cause the piston to reciprocate at a first speed	The complaint does not dispute this element.	¶28	col. 5:1-3
a drive mechanism that controls a predetermined stroke length of the piston	The complaint does not dispute this element.	¶28	col. 10:45-48
a quick-connect system ... configured to have a proximal end of the first massaging head inserted into or removed from the bore while the piston reciprocates the predetermined stroke length at the first speed	The Accused Product allegedly uses a friction-based "interference-fit" connection that requires "deliberate axial force" and is not "specially designed or adapted" for insertion or removal during reciprocation.	¶3; ¶23	col. 6:50-57

• Identified Points of Contention:
  • Scope Questions: The central dispute appears to be the proper construction of the claim term "a quick-connect system ... configured to have a ... massaging head inserted into or removed from the bore while the piston reciprocates." The case may turn on whether a conventional friction-fit or interference-fit mechanism can be considered "configured" for this purpose. Plaintiff argues it cannot, citing a PTAB construction requiring the system to be "specially designed and adapted" for such use, not merely capable of it Compl. ¶19
  • Technical Questions: An evidentiary question will be how the Accused Product's interface actually functions. The court will need to determine if the "deliberate axial force" and "radial interference" alleged by the Plaintiff Compl. ¶¶3, 23 are factually distinct from the "quick" and "easy" connection and disconnection functionality that may be implied by the patent's disclosure of a magnetic system and tapered head ’082 Patent, col. 6:57-65 ’082 Patent, col. 7:8-12

V. Key Claim Terms for Construction

• The Term: "a quick-connect system ... configured to have a proximal end of the first massaging head inserted into or removed from the bore while the piston reciprocates"
• Context and Importance: This limitation (the "Quick-Connect Limitation") is identified by the Plaintiff as dispositive for non-infringement Compl. ¶33 Its interpretation will determine whether the accused friction-fit interface falls within the scope of the claims. Practitioners may focus on this term because its construction was the subject of a PTAB decision, which provides a preview of the arguments each side may advance Compl. ¶19
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: A party arguing for a broader scope may assert that the plain language "configured to" simply means the structure is capable of performing the function, regardless of how easily. The claim does not explicitly require magnets or a tapered head, leaving open the possibility that other connection types could be included.
  • Evidence for a Narrower Interpretation: A party arguing for a narrower scope may point to the specification's disclosure of a magnetic connection system as the primary embodiment for achieving this function ’082 Patent, col. 6:57-65 Language describing a head that can "easily slip into the opening" while the piston is moving further suggests the system is intended to be more than a standard friction-fit connection ’082 Patent, col. 7:8-12 This evidence may support the PTAB's construction that the system must be "specially designed and adapted" for this purpose Compl. ¶19

VI. Other Allegations

• Indirect Infringement: The complaint preemptively argues against indirect infringement of method claim 18. It alleges that because the Accused Product lacks the "during-reciprocation configuration," there can be no underlying act of direct infringement by a user, which is a prerequisite for any indirect infringement claim Compl. ¶27
• Willful Infringement: The complaint does not mention any allegation of willful infringement.

VII. Analyst’s Conclusion: Key Questions for the Case

The resolution of this declaratory judgment action may depend on the court’s answers to several central questions:

• A core issue will be one of claim construction: Will the court adopt the narrow construction for the "Quick-Connect Limitation" previously articulated by the PTAB, which requires a system to be "specially designed and adapted" for removal during reciprocation, or will it apply a broader interpretation where mere capability is sufficient?
• A related question is one of factual infringement: Based on the adopted construction, does the Accused Product's "interference-fit" mechanism, which allegedly relies on friction and requires "deliberate axial force," fall within the scope of the claims? This will require a technical comparison of the product’s function to the claim language.
• Finally, the case presents a potential invalidity squeeze: If the claims are construed broadly enough to encompass the Accused Product's conventional friction-fit interface, does that broad scope render the claims obvious in light of prior art that allegedly discloses similar mechanical retention structures for interchangeable heads in treatment devices Compl. ¶¶44-46?