Opinion for the Court filed by Circuit Judge GAJARSA. Dissenting opinion filed by Circuit Judge MOORE.
GAJARSA, Circuit Judge.
This patent infringement case deals with orthopedic devices for the treatment of fractures to the upper arm. Defendants Stryker Corp., Stryker Sales Corp., Stryker Orthopaedics, and Howmedica Osteon-ics Corp. (collectively, “Stryker”) appeal from the final judgment of the United States District Court for the District of Oregon, following a jury trial, finding Stryker liable to plaintiff Acumed LLC (“Acumed”) for willful infringement of U.S. Patent No. 5,472,444 (“the '444 patent”). We affirm the district court’s findings of infringement and willfulness, but vacate the permanent injunction issued against Stryker and remand for reconsideration in light of the Supreme Court’s decision in eBay Inc. v. MercExchange, LLC, — U.S. -, 126 S.Ct. 1837, 164 L.Ed.2d 641 (2006).
I. BACKGROUND
A. The Technology and Patent
Acumed is the assignee of the '444 patent, which is directed to an orthopedic nail for the treatment of fractures in the humerus (the upper arm bone which ends in the shoulder ball at top and the elbow joint at the bottom). In the most common form of fracture to this bone, the patient falls on top of his or her arm, breaking the shoulder ball (the “humeral cortex”) off from the longer part of the bone (the “humeral shaft”). Sometimes the humeral cortex itself breaks into two or three pieces as well. See '444 patent col.l 11.17-27. Orthopedic surgeons use nails like the one disclosed in the patent to treat this type of fracture by excavating a hole through the humeral cortex and down the humeral shaft, inserting the nail into the hole, then fixing it in place using bone screws that pass through holes in the nail. This procedure secures the bone pieces of the cortex to each other and to the shaft.
Claim 1 of the '444 patent contains every limitation disputed on appeal by the parties. It reads:
An elongated tapered nail for securing fractures of the proximal humerus comprising: [803]*803an elongated body having a curved shank configured to occupy an upper portion of the proximal humeral shaft, and a contiguous butt portion extending proximally from the shank and configured to occupy the humeral cortex;
the butt portion being shorter than the shank and defining a plurality of at least three transverse holes, each defining a hole axis, with the three hole axes angu-larly offset from each other, such that the holes may receive fasteners attached to fragments of the humeral cortex.
'444 patent col.5 11.44-50 (disputed terms emphasized).
B. Stryker’s Dealings with Opinion Counsel
On August 28, 2002, Stryker’s German patent attorney, Edo Graalfs, wrote a letter to his American counterpart, Raymond W. Augustin, regarding the humeral nail Stryker was in the process of developing. Graalfs expressed concern that the Stryker nail might infringe the '444 patent:
[T]he independent claim 1 of this U.S. patent has a relatively brought [sic, “broad”] scope of protection.... I advised that the nail must not be provided with a curvature as this is a feature of independent claim 1. Now it turned out that for business reasons it would be a requirement to also use a curved shank. I expressed my doubts ... that it could be possible to find a structure not covered by the mentioned U.S. patent.
Augustin then placed a memorandum to file dated December 13, 2002, in which he echoed Graalfs’ concerns:
[T]he Stryker Trauma humeral nail would have each and every element of claim 1 ... of the '444 patent.... [I]t is our opinion that there is no strong invalidity argument which could be used against all the '444 issued claims based on the prior art known at this time.... In conclusion, it is our opinion that a curved version of the Stryker Trauma humeral nail ... should not be marketed in the United States.
Testimony at trial indicated that the Stryker nail eventually sold in the United States did not differ in any relevant respect from the design specifications reviewed by Graalfs and Augustin in writing these letters.
After his initial memorandum to file, Augustin drafted a formal opinion of counsel letter and transmitted it to Stryker on November 19, 2003. This opinion letter was longer and more detailed than the earlier memo to file. In it, Augustin concluded — using claim construction arguments basically identical to those made by Stryker during this litigation — that the Stryker nail would not infringe any claim of the '444 patent either literally or by equivalents. He also expressed a belief that Claim 1 of the '444 patent was invalid due to anticipation by an earlier Stryker product.1
At trial, Acumed presented evidence tending to show that Stryker did not seriously rely upon the later opinion letter from Augustin. For instance, Stryker filed with the FDA its application for the accused device on August 14, 2003, some months before Augustin transmitted the favorable opinion letter. Gregory Plakson, Stryker’s Director of Intellectual Property, testified at his deposition that he did not understand portions of the opinion letter and did not ask Augustin anything about the opinion. Acumed also presented evidence tending to show copying by Stryker, including that a Stryker consultant “confiscated” from an operating room a how-to [804]*804chart detailing the assembly and insertion of Acumed’s product.
C. Litigation background
Stryker began to sell its accused humeral nail in the United States in early 2004. In April 2004, Acumed filed suit against Stryker in the District of Oregon, alleging infringement of Claims 1, 3-5, 10, 11, and 14-17 of the '444 patent. Following a Markman hearing, the district court construed the disputed terms. It defined “curved shank” as “a shank that has a bend or deviation from a straight line without sharp corners or sharp angles” and “transverse holes” as “holes across the butt portion of the nail.” It also found that
the term “angularly offset from each other” means the axes of the three holes are spaced apart from each other, an angle is formed by the axes of any two such holes when viewed in two dimensions from the butt end or from the side, and the axes are not aligned in a parallel orientation.
Acumed LLC v. Stryker Corp., No. 04-CV-513-BR (D.Or. Oct. 14, 2004) (“Order on Claim Construction”). The case proceeded to jury trial on infringement, willfulness, and invalidity. The jury found that the asserted claims were valid, that Stryker’s product literally infringed those claims, and that Stryker’s infringement was willful. The district court denied Stryker’s motion for judgment notwithstanding the verdict and awarded Acumed enhanced damages for willful infringement, increasing the damages found by the jury by fifty percent. It permanently enjoined Stryker from selling the accused device in the United States.
Stryker appeals the jury verdict of infringement and willfulness and the district court’s grant of injunctive relief. This court has jurisdiction pursuant to 28 U.S.C. § 1295(a)(1).
II. DISCUSSION
A. Standard of review
A finding of patent infringement requires a two-step process: first, the court determines the meaning of the disputed claim terms, then the accused device is compared to the claims as construed to determine infringement. Markman v. Westview Instruments, Inc., 52 F.3d 967, 976 (Fed.Cir.1995), aff'd, 517 U.S. 370, 116 S.Ct. 1384, 134 L.Ed.2d 577 (1996). We review the construction step de novo. Cybor Corp. v. FAS Techs., Inc., 138 F.3d 1448, 1456 (Fed.Cir.1998) (en banc). When reviewing a district court’s denial of a motion for judgment as a matter of law, we review the jury’s factfinding on the infringement step for support by substantial evidence. Id. at 1454. Whether infringement is willful is a factual question that must be proven by clear and convincing evidence. Comark Commc’ns v. Harris Corp., 156 F.3d 1182, 1190 (Fed.Cir.1998). To reverse a willfulness verdict, an infringer must show that there is not “substantial evidence to support the jury’s finding of willfulness by clear and convincing evidence.” Id.
B. Claim Construction and Infringement
1. “Curved shank”
The main dispute between the parties on construction relates to the claim requirement of a “curved shank,” construed by the district court to mean a shank that “has a bend or deviation from a straight line without sharp corners or sharp angles.” Stryker challenges that interpretation, arguing that the better reading of the term is “a nonangular continuous bend.”
[805]*805When construing claims, a court must begin by “look[ing] to the words of the claims themselves ... to define the scope of the patented invention.” Phillips v. AWH Corp., 415 F.3d 1303, 1312 (Fed.Cir.2005) (en banc) (quoting Vitronics Corp. v. Conceptronic, Inc., 90 F.3d 1576, 1582 (Fed.Cir.1996)). The task of comprehending those words is not always a difficult one. “In some cases, the ordinary meaning of claim language as understood by a person of skill in the art may be readily apparent even to lay judges, and claim construction in such cases involves little more than the application of the widely accepted meaning of commonly understood words.” Id. at 1314. “[Cjurved,” as it is used in the '444 patent, is not a “term [ ] that ha[s] a particular meaning in a field of art.” Id. Its ordinary meaning encompasses “curvature” made up of small discontinuities. Consider, for instance, an archway made from rectangular bricks. The bricks are at angles with respect to each other, but the overall effect is to describe an arc. It would be unreasonable to say that such an archway is not “curved.” If the word “curved” is given its ordinary, lay meaning, the district court’s construction is correct.
Stryker argues that “curved” is implicitly assigned a different, narrower meaning by virtue of the context in the written description in which it appears. See id. at 1316 (“[Tjhe specification may reveal a special definition given to a claim term by the patentee that differs from the meaning it would otherwise possess. In such cases, the inventor’s lexicography governs.”). That argument is based on a particular manner of implanting the nail disclosed and touted by the written description. The '444 patent’s Summary of the Invention section states that “[tjhe curved tapered shape of the present invention permits it to be inserted into a cavity formed by a broach tool having the same shape as the nail.” '444 patent col.l 11.49-51. A broach tool is “essentially a rasp having the same profile as the hole it is intended to form.” Id. col.3 11.27-28. The patent teaches that broaching is advantageous, since, inter alia, it “generally causes less tissue damage than a rotating drill bit or reamer.” Id. col.3 11.32-33. However, “[bjroaching is only suitable for certain shapes of holes and objects” — in particular, it is useful only for an object that “largely pass[es] through its own envelope.” Id. col.3 11.37-40. “Objects with angled bends or small radius curves (relative to the object length) do not pass through their own envelope on insertion, and are not well suited to insertion into a broached hole.” Id. col.3 11.45-48.
Stryker’s argument is essentially an assertion that since the patent says broaching is desirable, the term “curved” must be construed to cover only embodiments whose curvature allows them to be inserted into a broached hole, excluding “angled bends or small radius curves.” That assertion is flawed: it is an attempt to import a feature from a preferred embodiment into the claims. See Phillips, 415 F.3d at 1323 (“[Ajlthough the specification often describes very specific embodiments of the invention, we have repeatedly warned against confining the claims to those embodiments.”). Neither use with a broaching tool nor suitability for such use is claimed. Indeed, the application which led to the '444 patent originally included claims to the method of implanting the nail with a broaching tool, but the patentee elected to withdraw those claims from the application after the Examiner noted they were directed to a separate, distinct invention.
The fact that usability with a broaching tool is merely a feature of a preferred embodiment provides sufficient [806]*806grounds for refusing to read “curved” narrowly. We also note, though, that the patent’s Claim 13 (not asserted by Acumed in this case) covers “[t]he nail of claim 1 having a profile that substantially passes within its own envelope.” '444 patent col.6 11.26-27. “[T]he presence of a dependent claim that adds a particular limitation raises a presumption that the limitation in question is not found in the independent claim.” Liebel-Flarsheim Co. v. Medrad Inc., 358 F.3d 898, 910 (Fed.Cir.2004); see also Wengner Mfg., Inc. v. Coating Mach. Sys., Inc., 239 F.3d 1225, 1234 (Fed.Cir.2001); Comark, 156 F.3d at 1187; Tandon Corp. v. U.S. Int’l Trade Comm’n, 831 F.2d 1017, 1023 (Fed.Cir.1987). “That presumption is especially strong when the limitation in dispute is the only meaningful difference between an independent and dependent claim, and one party is urging that the limitation in the dependent claim should be read into the independent claim.” SunRace Roots Enter. Co. v. SRAM Corp., 336 F.3d 1298, 1303 (Fed.Cir.2003); see also Ecolab Inc. v. Paraclipse, Inc., 285 F.3d 1362, 1375-76 (Fed.Cir.2002); Wengner Mfg., 239 F.3d at 1233 (“Claim differentiation ... is clearly applicable when there is a dispute over whether a limitation found in a dependent claim should be read into an independent claim, and that limitation is the only meaningful difference between the two claims.”). If we were to give “curved” in Claim 1 the meaning which Stryker advances, Claim 1 would cover only nails that “substantially pass [] within [their] own envelope[s].” Such a restrictive reading would render Claims 1 and 13 identical in scope. Since independent claims are presumed to have broader scope than their dependents, the presumption is that Claim 1 should not be limited in the manner Stryker urges. For the reasons discussed above, that presumption has not been rebutted.
Stryker also argues that the district court’s exclusion of “sharp corners or sharp angles” renders the construction insufficiently definite, since the court did not specify precisely how “sharp” is too sharp. However, a sound claim construction need not always purge every shred of ambiguity. The resolution of some line-drawing problems — especially easy ones like this one — is properly left to the trier of fact. See PPG Indus. v. Guardian Indus. Corp., 156 F.3d 1351, 1355 (Fed.Cir.1998) (“[A]f-ter the court has defined the claim with whatever specificity and precision is warranted by the language of the claim and the evidence bearing on the proper construction, the task of determining whether the construed claim reads on the accused product is for the finder of fact.”); Modine Mfg. Co. v. U.S. Int’l Trade Comm’n, 75 F.3d 1545, 1554 (Fed.Cir.1996) (whether claim limitation requiring diameter of “about 0.040 inch” embodied held a matter of “technologic fact”); see also Abbott Labs. v. Baxter Pharm. Prods., Inc., 471 F.3d 1363, 1368 (Fed.Cir.2006) (where result is the same under any reasonable construction, “we need not construe [the disputed] phrase with numerical exactitude.”). Here, the accused product has a rounded-off six-degree angle in its shaft. A reasonable jury could have found that in the context of this sort of nail, a rounded bend of six degrees was not a “sharp angle.” The jury’s conclusion is bolstered by the testimony of Stryker’s own technical expert, who noted in reference to the Stryker nail that “there’s no sharp angle there.” There may be some area of imprecision within the district court’s “without sharp angles” construction, but this accused product is in no danger of falling within that area. The construction is correct, and the jury’s finding that the Stryker nail possesses a “curved shank” is supported by substantial evidence.
[807]*8072. “Transverse holes”
The district court defined “transverse holes” as “holes across the butt portion of the nail.” Stryker argues that this claim term should be limited to holes that are perpendicular to the nail shaft, excluding from the claim scope holes that are tilted so that one end of the hole is vertically offset from the other end. Again, this argument is an improper attempt to read a feature of the preferred embodiment into the claims as a limitation.
Stryker’s argument for a narrow reading of “transverse” stems from the fact that “[e]very description of the transverse holes in the '444 patent contemplates a perpendicular hole.” This is a correct characterization of the patent: every figure which illustrates the holes shows them going perpendicularly through the shaft, and the written description characterizes the holes in Figure 2 as “perpendicular to the portion of the nail axis at the butt portion 14 of the nail.” '444 patent col.2 11.58-59. However, Figure 2 and the text characterizing it simply discloses a single, preferred embodiment of the invention. “[Although the specification often describes very specific embodiments of the invention, we have repeatedly warned against confining the claims to those embodiments.” Phillips, 415 F.3d at 1323; see also Comark, 156 F.3d at 1186-87.
The plain meaning of Claim 1 covers more than the particular embodiment shown in the figures. While the disclosed embodiment possesses “perpendicular” holes, the claim language covers all “transverse” holes — a word that does not necessarily imply right angles. Moreover, the patentees’ description of their preferred embodiment itself implies a difference between the words “perpendicular” and “transverse.” The written description states that Figure 2 “illustrates a plurality of transverse holes, each of which is ... perpendicular to the portion of the nail axis at the butt portion 14 of the nail.” '444 patent col.2 11.56-59. This implies that a “transverse” hole need not be “perpendicular” — if it were, the patentee would not have needed to clarify that these holes, in addition to being transverse, were perpendicular to the nail axis. Just as in Phillips, where the asserted claim mentioned “steel baffles” and hence “strongly im-plie[d] that the term ‘baffles’ does not inherently mean objects made of steel,” 415 F.3d at 1314, this usage of language is strong evidence that the patentee considered “transverse” and “perpendicular” to have distinctly different meanings.
The intrinsic evidence of the specification therefore suggests that the patentees knew how to restrict their claim coverage to holes passing through at right angles. They could have used the word “perpendicular,” as they did in discussing their preferred embodiment. Instead, they chose a different term that implies a broader scope. The intrinsic evidence does not indicate that one of skill in the art would believe the patentees meant “perpendicular” when they said “transverse.” There is very little indication that the patentees considered perpendicularity important to their invention. The patentees tout the virtue of their preferred hole orientation only once, noting that “[t]he predictability of fracture modes makes the orientation of holes in the illustrated embodiment suitable in most cases.” '444 patent col.4 11.65-67 (emphasis added). Far from demonstrating that “the patentee[s] ... intended] for the claims and the embodiments in the specification to be strictly coextensive” with respect to this limitation, Phillips, 415 F.3d at 1323, this statement admits that the disclosed perpendicular hole orientation may not always be ideal. See '444 patent eol.5 11.2-4 (suggesting that, if holes are not “ideally situated, the [808]*808surgeon may slightly rotate the nail to achieve a more favorable alignment”). Nowhere in the specification or the prosecution history do the patentees criticize or distinguish tilted, non-perpendicular holes.
The dissent states that the specification language which discloses only perpendicular holes should be determinative of the claim scope. In particular, it points to three instances in the written description where “transverse holes” are described as “perpendicular.” Dissent at 812-13 (citing '444 patent col. 2 11.57-59; col.3 11.1 — 3; col.3 11.9-11). All three of these instances appear in a textual description of the patent’s Figure 2, indicating that the holes depicted in that figure are perpendicular to the nail axis. Thus, while the dissent emphasizes the fact that there are three references to “perpendicular” holes in the specification, its argument is ultimately premised on characteristics which the pat-entee has attributed to a single preferred embodiment. In the context of this patent, such an argument must be contradicted by “our repeated statements that limitations from the specification are not to be read into the claims.” Comark, 156 F.3d at 1186; see also id. at 1187 (“[T]he language that [the defendant] argues should limit claim 1 is clearly found in the ... patent’s description of the preferred embodiment. It is precisely against this type of claim construction that our prior case law counsels.”).
By highlighting the specification phrase “each of which is defined” and by describing that phrase as “important [1],” Dissent at 814, the dissent appears to suggest that the patentee has in some sense imposed a limiting definition upon the word “transverse.” But the use of the word “defined” here does not imply a lexicographic definition, especially not a definition of “transverse” to mean “perpendicular.” Instead, the statement that the holes of the cited embodiment are “defined on ... an axis” merely introduces the useful abstract concept of a “hole axis,” later employed in the claims to describe the orientation of the holes with respect to each other. See '444 patent, Claim 1, col.5 11.53-54 (“the three hole axes [are] angularly offset from each other ... ”). The claims repeatedly echo this form of usage of the word “define.” See, e.g., '444 patent Claim 1, col.5 11.51-53 (“the butt portion ... defining a plurality of at least three transverse holes, each defining a hole axis” (emphasis added)); Claim 2, col.5 11.57-58 (“the curved shank includes a curved portion defining a curved central axis”); Claim 3, col.5 11.60-61 (“the butt portion defines a central axis”). If the word “define” were always to be an important signifier of limitation, this claim language would indicate that the butt portion has been defined to be transverse holes, that those holes in turn have been defined as hole axes, and that the curved portion and butt portion — physical parts of the nail — have each been dubbed identical to an imaginary central axis. These interpretations are incorrect, but they are the natural consequence of finding a restrictive definition of a term anywhere the word “define” might appear in this patent, regardless of context. The specification does not define “transverse” and “perpendicular” to be coequal in meaning.
The fact that the term “transverse” has a broader scope than “perpendicular” also distinguishes this case from Nystrom v. TREX Co., 424 F.3d 1136 (Fed.Cir.2005), relied upon by the dissent. See Dissent at 814-15. In Nystrom, “both parties acknowledge[d] the ordinary meaning of ‘board’ as ‘a piece of sawed lumber,’ ” but the patentee sought to have that claim term “broaden[ed] ... to encompass relatively obscure definitions that are not supported by the written description or prosecution history.” Id. at 1145. We refused [809]*809to impose a construction broader than the term’s ordinary meaning. Id. at 1145^6. Here, on the contrary, we decline to impose a construction narrower than the term’s ordinary meaning.
The dissent cites to other patents whose usage of “transverse” arguably supports its conclusion. Dissent at 815-16. One of them, U.S. Patent No. 5,697,934, is purely extrinsic evidence and therefore merits little consideration. See Phillips, 415 F.3d at 1317. The other, U.S. Patent No. 4,475,545, is cited by the '444 patent and is part of the intrinsic record. However, it was not “created by the patentee in attempting to explain and obtain the patent.” Id. Its usage is not that of this patentee, and so it also merits less weight than the evidence of the patentee’s own words. While these patents merit some consideration, the specification and claims of the '444 patent itself should be given significantly greater weight. Id. (noting that prosecution evidence “is less useful for claim construction purposes”).
A proper reading of the intrinsic evidence indicates that where the patentees discussed the perpendicular holes of their preferred embodiment, they were not narrowly defining the term “transverse” or otherwise limiting the claims, but merely discharging their statutory duties “to teach and enable those of skill in the art to make and use the invention and to provide a best mode for doing so.” Phillips, 415 F.3d at 1323. That preferred embodiment cannot be the only product covered by the claims; if it were, the claims themselves would be unnecessary. The district court’s construction of “transverse holes” is correct.2
3. “Angularly offset”
As noted above, the district court interpreted the claim requirement that the hole axes be “angularly offset” to mean that “the axes of the three holes are spaced apart from each other, an angle is formed by the axes of any two such holes when viewed in two dimensions from the butt end or from the side, and the axes are not aligned in a parallel orientation.” Neither party challenges this definition on appeal, but Stryker argues that its accused product does not fall within the definition.
[810]*810Stryker’s argument is geometrical in nature. A “hole axis” under the district court’s definition is the imaginary line that passes through the center of one of the transverse holes. Stryker correctly points out that the axes thus defined by the accused product form “skew lines” which are neither parallel nor intersecting in three-dimensional space. Since those lines neither form angles nor run parallel with each other, Stryker suggests that its product falls outside the district court’s definition. However, this argument ignores an essential part of that definition, which states that “an angle is formed ... when [the
hole axes are] viewed in two dimensions.” The district court’s meaning here is clear: the hole axes need not actually intersect. It suffices that the axes appear to intersect in two dimensions. As an example, if the hole axes are sketched on a piece of paper (a two-dimensional view of the nail) and the lines of that drawing intersect, the product drawn meets the district court’s definition of “angularly offset.” It is totally clear that the hole axes of Stryker’s product intersect when drawn on paper, a point well illustrated by Stryker’s own diagram in support of its argument on this point:
[[Image here]]
This diagram, which represents the accused product, shows intersecting hole axes when viewed in two dimensions. The jury’s finding that Stryker’s product embodies the “angularly offset” claim limitation is therefore supported by substantial evidence.
4. Conclusion
Since the district court’s claim construction is correct and there is substantial evidence to support the jury’s finding that Stryker’s product embodies each claim limitation at issue, the judgment of infringement is affirmed.
C. Willful Infringement
The jury found Stryker’s infringement to be willful, despite the fact that Stryker admitted into evidence the November 19, 2003 opinion letter from Au-gustin which concluded that Stryker’s product would not infringe. Favorable opinions of counsel normally present a well-grounded defense to willfulness, but the protection they afford is not absolute. “Those cases where willful infringement is found despite the presence of an opinion of counsel generally involve situations where opinion of counsel was either ignored or found to be incompetent.” Read Corp. v. Portec, Inc., 970 F.2d 816, 828-29 (Fed.Cir.1992).
[811]*811Willfulness is “not an all-or-nothing trait, but one of degree.” Comark, 156 F.3d at 1182 (quoting Rite-Hite Corp. v. Kelley Co., 819 F.2d 1120, 1125-26 (Fed.Cir.1987)). Whether an infringer ignored the opinion of its counsel is, as part of the willfulness inquiry, also a question of degree. Evidence of the extent of that ignorance should be weighed by the factfinder together with the totality of the other circumstances surrounding the infringer’s culpability. See Comark, 156 F.3d at 1191 (evaluating opinion of counsel within a totality of the circumstances).
Here, substantial evidence supports a finding that Stryker ignored the November 2003 opinion letter to an extent sufficient to permit willfulness to be found in these circumstances. Most notable is the fact that two patent attorneys, Graalfs and Augustin, had at first strongly discouraged Stryker from marketing the infringing nail in the United States. Despite that advice, Stryker continued to push towards a United States market entry, filing its FDA application months before it received Au-gustin’s revised legal advice. Additionally, Acumed presented evidence that Stryker copied its product, including that Stryker arranged to “confiscate” a hospital room chart instructing doctors in the use of the Acumed nail.
There is evidence in the record tending against willfulness, such as the Augustin opinion letter itself and the testimony of Stryker’s Director of Intellectual Property that he ordered no sales be made in the United States until after the favorable opinion letter. However, it is for the jury, not this court, to determine the weight and credibility to be given to the evidence. See Comark, 156 F.3d at 1192 (court determining whether to overturn a jury verdict is “not required to assume that the jury believed all or indeed any ... exculpatory evidence”). The jury here was free to disbelieve or weigh lightly evidence tending to show Stryker’s reliance on the opinion letter and to place that evidence within the overall factual context of the case.
Substantial evidence supports the jury’s finding that Stryker’s infringement was willful. The judgment of willfulness is therefore affirmed.
D. Permanent Injunction
In ruling on the plaintiffs’ motion for a permanent injunction, the district court applied “the general rule [in patent cases] that an injunction will issue, once infringement and validity have been adjudged ... unless there are some exceptional circumstances that justify denying injunctive relief.” Transcript of Record at 53, Acumed, LLC v. Stryker Corp., No. CV-04-513 (D. Oregon Feb. 22, 2006). The Supreme Court has since struck down that general rule in eBay v. MercEx-change, making clear that the traditional four-factor test for injunctions applies to patent cases. 126 S.Ct. at 1840.
Acumed argues that the facts found by the district court can serve as independent support for the injunction, even without application of the old general rule. This court cannot express a position on that argument. If we were to weigh the evidence ourselves to reach a conclusion on injunctive relief, we would effectively be exercising our own discretion as if we were the first-line court of equity. That role belongs exclusively to the district court. Our task is solely to review the district court’s decisions for an abuse of discretion. See eBay, 126 S.Ct. at 1839 (“The decision to grant or deny permanent injunctive relief is an act of equitable discretion by the district court, reviewable on appeal for abuse of discretion.”). Accordingly, the permanent injunction is vacated. On remand, the district court should reconsider the four-factor test as propounded by the [812]*812Supreme Court’s decision in eBay as to whether or not an injunction should issue.
III. CONCLUSION
The district court’s claim construction and its findings of infringement and willfulness are affirmed. The permanent injunction is vacated and remanded.
AFFIRMED-IN-PART, VACATED-IN-PART, AND REMANDED
No costs.