Route 92 Medical Inc v. Balt USA LLC

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Route 92 Medical, Inc. (Delaware)
  • Defendant: Balt USA LLC (Delaware)
  • Plaintiff's Counsel: PHILLIPS, MCLAUGHLIN & HALL, P.A.; Knobbe, Martens, Olson & Bear, LLP
• Case Identification: 1:25-cv-00986, D. Del., 09/08/2025
• Venue Allegations: Venue is based on Defendant being a Delaware limited liability company, which is alleged to constitute residence in the District of Delaware.
• Core Dispute: Plaintiff alleges that Defendant's neurovascular catheter systems for treating ischemic stroke infringe five U.S. patents related to the design, structure, and use of aspiration and delivery catheters.
• Technical Context: The technology concerns endovascular catheter systems used for mechanical thrombectomy, a procedure to remove blood clots from cerebral arteries in patients suffering an acute ischemic stroke.
• Key Procedural History: The complaint is a First Amended Complaint. No prior litigation, inter partes review proceedings, or licensing history between the parties is mentioned.

Case Timeline

Date	Event
2007-01-01	Dr. Tony Chou founds Silk Road Medical
2015-01-01	Dr. Tony Chou founds Route 92 Medical
2015-02-04	Earliest Priority Date for '972 and '036 Patents
2018-05-17	Earliest Priority Date for '9770, '032, and '5770 Patents
2019-08-02	'9770 Patent Filed
2021-01-19	'972 Patent Filed
2022-01-25	'9770 Patent Issued
2022-12-16	'032 Patent Filed
2023-04-07	'5770 Patent Filed
2023-10-24	'972 Patent Issued
2023-11-07	'032 Patent Issued
2024-03-12	'5770 Patent Issued
2025-01-16	'036 Patent Filed
2025-05-01	Plaintiff's HiPoint® 88 reperfusion system receives FDA clearance
2025-07-01	'036 Patent Issued
2025-09-08	First Amended Complaint Filed

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

U.S. Patent No. 11,229,770 - Aspiration catheter systems and methods of use

• Patent Identification: U.S. Patent No. 11,229,770 ("Aspiration catheter systems and methods of use"), issued January 25, 2022.

The Invention Explained

• Problem Addressed: The patent describes the challenge of navigating interventional devices through the tortuous anatomy of cerebral arteries to treat acute ischemic stroke, noting the time required is critical for successful outcomes Compl. ¶13 '9770 Patent, col. 1:22-48 Existing systems can be technically challenging to use and may require multiple operators Compl. ¶13 '9770 Patent, col. 2:24-34
• The Patented Solution: The patent discloses a coaxial catheter system comprising an outer catheter and an inner "catheter advancement element" designed to be advanced together '9770 Patent, abstract The system features specific dimensional relationships and flexibility characteristics, including a "snug point" with a minimal gap between the inner and outer components, which is intended to reduce the "ledge effect" (the tendency of a catheter to catch on arterial branches) and facilitate smoother navigation through complex vascular pathways '9770 Patent, col. 2:53-65 '9770 Patent, col. 41:50-65
• Technical Importance: This design aims to streamline stroke treatment by reducing procedure time and increasing the consistency and safety with which a physician can navigate a patient's anatomy to restore blood flow Compl. ¶15

Key Claims at a Glance

• The complaint asserts independent claim 1 Compl. ¶29
• Essential elements of claim 1 include:
  • A coaxial catheter system comprising a catheter and a catheter advancement element.
  • The catheter has a distal portion with a lumen of at least about 0.052".
  • The catheter advancement element has a tubular portion with an inner diameter of about 0.014" to 0.024" and an outer diameter with at least one "snug point."
  • A difference between the catheter's inner diameter and the advancement element's outer diameter at the snug point is "no more than about 0.010"."
  • A polymer tip portion on the advancement element with specific bending force characteristics at three distinct points (distal, intermediate, proximal).
  • The system as a whole has specific flexibility slope characteristics defined by a ratio of less than 25.
• The complaint does not explicitly reserve the right to assert dependent claims for the '9770 Patent.

U.S. Patent No. 11,793,972 - Rapid aspiration thrombectomy system and method

• Patent Identification: U.S. Patent No. 11,793,972 ("Rapid aspiration thrombectomy system and method"), issued October 24, 2023.

The Invention Explained

• Problem Addressed: The patent addresses the need for rapid and safe access to cerebral occlusions for stroke treatment, highlighting the difficulty in navigating the tortuous neurovasculature Compl. ¶13 '972 Patent, col. 1:19-59
• The Patented Solution: The patent describes an intravascular access catheter with a flexible elongate body that includes a "tapered region." The invention places a first radiopaque marker at the distal end of this tapered region and a second marker at the proximal end, which is configured to identify the catheter's maximum outer diameter '972 Patent, abstract This marker system is designed to provide clear visualization under fluoroscopy, helping the physician to position the catheter and understand its properties during the procedure '972 Patent, col. 2:6-26
• Technical Importance: The specific placement and function of the radiopaque markers provide clinicians with enhanced visual feedback, potentially improving the safety and precision of catheter placement in complex anatomies.

Key Claims at a Glance

• The complaint asserts independent claim 1 Compl. ¶45
• Essential elements of claim 1 include:
  • An intravascular access catheter for advancing a medical device.
  • A flexible elongate body with a proximal end, a distal-most end, and a single lumen.
  • The body comprises a plurality of regions, including a "tapered region."
  • A first marker visible under fluoroscopy at the distal end of the tapered region.
  • A second marker visible under fluoroscopy at the proximal-most end of the tapered region, configured to identify a maximum outer diameter of the body.
  • The tapered region comprises an unreinforced polymer.
  • A proximal extension extending from the flexible body to an extracorporeal proximal end.
• The complaint alleges infringement of "at least claim 1" and "one or more claims," suggesting a reservation of rights to assert other claims Compl. ¶¶45-46

Multi-Patent Capsules

• U.S. Patent No. 11,806,032:

  • Patent Identification: U.S. Patent No. 11,806,032 (Aspiration catheter systems and methods of use), issued November 7, 2023 Compl. ¶25
  • Technology Synopsis: The patent relates to a catheter system for performing a medical procedure in a cerebral vessel. It describes a system with an outer catheter and an inner "catheter advancement device" comprising segments of different materials (durometers) to create a specific flexibility profile, including a softer tip segment designed to facilitate advancement within the vessel Compl. ¶¶59-61 '032 Patent, abstract
  • Asserted Claims: At least Claim 1 Compl. ¶57
  • Accused Features: The Carrier-Raptor system, where the inner Carrier catheter is alleged to be the "catheter advancement device" and the outer Raptor catheter is the "outer catheter" Compl. ¶¶60-61

• U.S. Patent No. 11,925,770:

  • Patent Identification: U.S. Patent No. 11,925,770 (Aspiration catheter systems and methods of use), issued March 12, 2024 Compl. ¶26
  • Technology Synopsis: The patent describes a catheter system with an aspiration catheter and a "catheter advancement element" Compl. ¶¶74-75 The invention focuses on the specific geometry and flexibility characteristics of the advancement element's tapered tip portion, defined by bending forces at specified points and calculated flexibility slopes, to achieve a desired performance during navigation '5770 Patent, abstract
  • Asserted Claims: At least Claim 1 Compl. ¶72
  • Accused Features: The Carrier-Raptor system, where the Carrier is alleged to be the "catheter advancement element" with a tapered tip portion that infringes the claimed flexibility and configuration requirements Compl. ¶¶75-79

• U.S. Patent No. 12,343,036:

  • Patent Identification: U.S. Patent No. 12,343,036 (Methods and systems for treatment of acute ischemic stroke), issued July 1, 2025 Compl. ¶27
  • Technology Synopsis: The patent describes a three-part system for treating stroke, comprising an outer catheter, an inner member slidable within it, and a guidewire slidable within the inner member Compl. ¶89 '036 Patent, abstract The invention focuses on the dimensional relationship between the components to create a "smooth transition" and minimize the "ledge effect" at the distal end of the catheter to facilitate delivery past tortuous anatomy '036 Patent, col. 2:54-67
  • Asserted Claims: At least Claim 1 Compl. ¶87
  • Accused Features: The Carrier-Raptor-Hybrid system, which includes the Raptor (outer catheter), Carrier (inner member), and Hybrid Guidewire (guidewire), is alleged to practice the claimed system configuration Compl. ¶¶89-97

III. The Accused Instrumentality

Product Identification

• The accused instrumentalities are Defendant Balt's Carrier Delivery Catheter ("Carrier"), Raptor Aspiration Catheter ("Raptor"), and Hybrid Guidewire, as used together in the "Carrier-Raptor system" and "Carrier-Raptor-Hybrid system" Compl. ¶¶22, 89

Functionality and Market Context

• The complaint alleges that the Carrier-Raptor system is used for neurovascular intervention to treat acute ischemic stroke Compl. ¶22 In this system, the Carrier catheter is used to deliver the Raptor aspiration catheter to the treatment site within the brain's vasculature Compl. ¶22 The complaint includes a visual from Defendant's promotional materials showing the inner Carrier catheter inside the outer Raptor catheter navigating a tortuous vessel path Compl. p. 8 The complaint alleges that clinicians are taught to use the components together in this manner Compl. ¶22 The Carrier-Raptor-Hybrid system adds the Hybrid Guidewire to aid in insertion Compl. pp. 6-7

IV. Analysis of Infringement Allegations

11,229,770 Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
a coaxial catheter system, the system comprising: a catheter comprising: a distal, catheter portion having a lumen, and a distal end region, and a distal-most end having an opening from the lumen, the lumen having an inner diameter at the distal end region of at least about 0.052″; and a proximal extension...	The Carrier-Raptor system is a coaxial system. The Raptor catheter is alleged to be the claimed "catheter," with a distal catheter portion having a lumen with an inner diameter of at least 0.052" (0.071" or 0.074" alleged).	¶31; ¶32	col. 41:55-62
a catheter advancement element comprising: a tubular portion having an inner diameter that is at least about 0.014" up to about 0.024", an outer diameter, wherein the outer diameter has at least one snug point, wherein a difference between the inner diameter of the distal, catheter portion and the outer diameter of the tubular portion at such snug point is no more than about 0.010"...	The Carrier catheter is alleged to be the "catheter advancement element." It has a tubular portion with an inner diameter of 0.021" and a "snug point" where the difference in diameters between the Raptor and Carrier is allegedly no more than 0.010". The complaint provides an annotated figure from Defendant's marketing video identifying the "snug point" Compl. p. 11	¶33; ¶34	col. 42:21-32
and a tubular, polymer tip portion located distal to the at least one snug point of the tubular portion, wherein the tip portion has a length and tapers along at least a portion of the length of the tip portion...	The Carrier is alleged to have a tapered polymer tip portion distal to the snug point.	¶33	col. 42:57-60
wherein the tip portion in the advancement configuration has at least three points spaced along the length of the tip portion... a distal point... having a first bending force that is no greater than about 0.05 Newtons; an intermediate point... and a proximal point...	On information and belief, the Carrier's tip portion is alleged to have at least three points with the claimed bending force characteristics, with the distal point having a force no greater than 0.05 Newtons.	¶35	col. 80:12-25
wherein the coaxial system in the advancement configuration has at least two system points along a length of the coaxial system... wherein a ratio of the third flexibility slope to the average tip portion flexibility slope is less than about 25.	On information and belief, the Carrier-Raptor system is alleged to have the claimed system points and a ratio of flexibility slopes of less than about 25. An annotated video still from Defendant is used to show the alleged system points Compl. p. 12	¶35; ¶36; ¶37	col. 80:26-81:1

• Identified Points of Contention:
  • Quantitative Questions: The complaint's allegations regarding specific bending forces (e.g., "no greater than about 0.05 Newtons"), dimensional tolerances (e.g., "no more than about 0.010""), and flexibility slope ratios ("less than about 25") are made "on information and belief" Compl. ¶¶35-37 A central point of contention will be whether physical testing of the accused Carrier-Raptor system confirms that it meets these precise, quantitative claim limitations.
  • Scope Questions: The claim requires a "tubular, polymer tip portion." The complaint alleges the Carrier's tapered tip is tubular and comprises a polymer Compl. ¶33 A potential dispute may arise over whether the accused product's "tapered tip" meets the full structural and material definition of the claimed "tubular, polymer tip portion" as understood in the context of the patent's specification.

11,793,972 Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
An intravascular access catheter for advancing a medical device for intraluminal medical procedures within the neurovasculature, comprising: a flexible elongate body having a proximal end, a distal-most end, and a single lumen extending therebetween...	The accused Carrier is alleged to be an intravascular access catheter for advancing interventional devices in the neurovasculature, with a flexible elongate body and single lumen. The complaint includes a figure from the Carrier's Instructions for Use (IFU) to support this Compl. p. 15	¶47; ¶48	col. 2:6-10
wherein the flexible elongate body comprises a plurality of regions, wherein one of the plurality of regions is a tapered region, and wherein the distal-most end defines a distal opening from the single lumen;	The Carrier is alleged to have a "tapered region" (also described as a "tapered tip" or "tapered distal segment") and a distal opening.	¶48	col. 2:10-13
a first marker that is visible under fluoroscopy disposed at a distal end of the tapered region...	The Carrier allegedly has a first radiopaque marker at the distal end of its tapered region. A diagram from the complaint annotates the alleged location of this marker Compl. p. 16	¶49	col. 2:14-16
a second marker that is visible under fluoroscopy disposed at a proximal-most end of the tapered region and configured to identify a maximum outer diameter of the flexible elongate body;	The Carrier allegedly incorporates a second radiopaque marker at the proximal end of the tapered region, which is configured to identify the maximum outer diameter of the body.	¶49	col. 2:16-19
wherein the tapered region comprises an unreinforced polymer;	On information and belief, the tapered region of the Carrier is alleged to comprise an unreinforced polymer.	¶49	col. 2:19-20
and a proximal extension extending proximally from the proximal end of the flexible elongate body to an extracorporeal proximal end...	The Carrier has a proximal extension extending to an extracorporeal proximal end, with a lumen communicating with the single lumen of the flexible elongate body.	¶50	col. 2:21-26

• Identified Points of Contention:
  • Technical/Factual Questions: The claim requires the tapered region to comprise an "unreinforced polymer." The complaint asserts this on "information and belief" Compl. ¶49 A key factual question will be the actual material composition of the accused Carrier's tapered region and whether it is, in fact, "unreinforced."
  • Functional Questions: The claim requires the second marker to be "configured to identify a maximum outer diameter." The complaint asserts this configuration Compl. ¶49 The infringement analysis may turn on what evidence demonstrates this specific configuration and function, beyond the mere presence of a marker at that location.

V. Key Claim Terms for Construction

From U.S. Patent No. 11,229,770:

• The Term: 'snug point'
• Context and Importance: This term is central to the patent's proposed solution for reducing the "ledge effect." It defines the specific location where the dimensional tolerance between the inner and outer catheters is most critical ("no more than about 0.010""). Practitioners may focus on this term because its definition-whether it is a single geometric point, a region, or a functional location of tightest tolerance-will determine if the variable dimensions of the accused products fall within the claim's scope.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification describes the "snug point" functionally as a location along the catheter's length that can be substantially uniform or non-uniform, suggesting it is not limited to a single, fixed geometric feature '9770 Patent, col. 4:32-37
  • Evidence for a Narrower Interpretation: The specification also describes the snug point as potentially being where a radiopaque marker band is positioned '9770 Patent, col. 4:25-28 An argument could be made that this ties the "snug point" to a specific, identifiable structure shown in the embodiments, potentially narrowing its definition.

From U.S. Patent No. 11,793,972:

• The Term: 'tapered region'
• Context and Importance: The definition of this term is critical because the claim requires it to be made of an "unreinforced polymer" and to have radiopaque markers at its proximal and distal ends. The accused Carrier product is described as having a "tapered tip" or "tapered distal segment" Compl. ¶48 Whether this accused feature is equivalent to the claimed "tapered region" will depend on how broadly or narrowly the term is construed.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification describes the benefit of tapering in functional terms, such as facilitating advancement and navigating tortuous anatomy '972 Patent, col. 16:5-15, which might support a broader definition that is not limited to a specific structure.
  • Evidence for a Narrower Interpretation: The patent consistently depicts the "tapered region" as a distinct segment of the catheter body with clearly defined start and end points where the markers are placed '972 Patent, FIG. 1 Compl. p. 15 This could support an interpretation that the "tapered region" must be a discrete, identifiable section of the catheter, rather than just any part that happens to be tapered.

VI. Other Allegations

• Indirect Infringement: The complaint alleges induced infringement for all asserted patents. The allegations are based on Defendant's marketing, selling, and providing instructions for use, manuals, and other materials that allegedly instruct and encourage physicians and other end-users to operate the accused systems in an infringing manner Compl. ¶39 Compl. ¶52 Compl. ¶66 Compl. ¶81 Compl. ¶99
• Willful Infringement: The complaint alleges willful infringement for all asserted patents based on Defendant's alleged knowledge of the patents "no later than the filing of the Complaint" and continued infringing acts thereafter Compl. ¶41 Compl. ¶53 Compl. ¶68 Compl. ¶83 Compl. ¶101 The allegations also reference Plaintiff's product marking and "notoriety in the field" as a basis for knowledge, suggesting a claim of pre-suit knowledge Compl. ¶38 Compl. ¶51

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

1. A central evidentiary issue will be one of quantitative verification: will discovery and testing confirm that the accused Carrier-Raptor system actually possesses the specific, numerically-defined bending forces, dimensional tolerances, and flexibility slope ratios required by claims in the '9770 and '5770 patents? The complaint's reliance on "information and belief" for these critical quantitative limitations suggests this will be a primary factual battleground.

2. A key legal question will be one of structural construction: can terms like 'snug point' ('9770 patent) and 'tapered region' ('972 patent), which are tied to specific dimensional and material limitations, be interpreted functionally, or will they be narrowly construed based on the specific embodiments disclosed in the patents? The outcome of this claim construction will likely determine whether the accused product's structure falls within the scope of the claims.

3. A core issue of infringement will be one of system equivalence: does the combination of Balt's Carrier, Raptor, and Hybrid Guidewire products, when used as instructed, operate as the integrated, multi-component systems claimed in the '036 and '9770 patents? The case may turn on whether the accused components create the same "smooth transition" and solve the "ledge effect" in the same way as the patented inventions, or if there is a fundamental mismatch in their cooperative functionality.