Trigger thumb treatment devices

Abstract

A device for treating trigger thumb or trigger finger may include a handle, an introducer shaft extending from the handle, a blade shaft slidably disposed on the handle and the introducer shaft, a blade at or near a distal end of the blade shaft, a slider on the handle, attached to a proximal end of the blade shaft, for sliding the blade shaft and the blade distally and proximally along the introducer shaft, and a neurovascular guard slidably coupled with the handle and disposed over at least part of the blade shaft. The neurovascular guard may be made of a material that allows passage of ultrasound waves, such as Ultem, PEEK, PPS, or other polymers.

Description

(19) *EP004710889A2* (11) EP 4 710 889 A2 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: 18.03.2026 Bulletin 2026 / 12 (21) Application number: 26150804.8 (22) Date of filing: 30.01.2023 (51) International Patent Classification (IPC): A61B 90 / 00 (2016.01) (52) Cooperative Patent Classification (CPC): A61B 17 / 320036; A61B 2017 / 00924; A61B 2090 / 08021 (84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 31.01.2022 US 202263304880 P 05.05.2022 US 202263338726 P (62) Document number(s) of the earlier application(s) in accordance with Art. 76 EPC: 23707558.5 / 4 472 531 (71) Applicant: Sonex Health, Inc. Eagan, Minnesota 55121 (US) (72) Inventor: BARNES, Darryl E. Eagan (US) (74) Representative: IK-IP LTD 8 Devonshire Square London EC2M 4YJ (GB) Remarks: This application was filed on 08.01.2026 as a divisional application to the application mentioned under INID code 62. (54) TRIGGER THUMB TREATMENT DEVICES (57) A device for treating trigger thumb or trigger finger may include a handle, an introducer shaft extend- ing from the handle, a blade shaft slidably disposed on the handle and the introducer shaft, a blade at or near a distal end of the blade shaft, a slider on the handle, attached to a proximal end of the blade shaft, for sliding the blade shaft and the blade distally and proximally along the introducer shaft, and a neurovascular guard slidably coupled with the handle and disposed over at least part of the blade shaft. The neurovascular guard may be made of a material that allows passage of ultra- sound waves, such as Ultem, PEEK, PPS, or other polymers. EP 4 71 0 88 9 A 2 Processed by Luminess, 75001 PARIS (FR) 2 1 EP 4 710 889 A2 2 Description CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to U.S. Provi- sional Application Nos. 63 / 304,880, filed January 31, 2022, and 63 / 338,726, filed May 5, 2022, both of which are titled Trigger Thumb Treatment Device. The disclo- sures of the above-cited priority applications are hereby incorporated by reference in their entireties herein. TECHNICAL FIELD

[0002] The present application relates generally to medical devices and methods. More specifically, the present application relates to devices and methods for treating trigger thumb. BACKGROUND

[0003] As minimally invasive surgery has evolved, nu- merous tools have been developed to assist in treating medical conditions thathavepreviouslybeen treatedwith open andmore invasive techniques. Treatment of trigger finger is one such example. The first annular ("Al") pulley is a small band of tissue on the palmar side of a person’s hand. In some cases, the flexor tendon thickens, and a nodule can get caught on the A1 pulley and cause irrita- tion and mechanical symptoms. The flexor tendon can then become locked in place when a person flexes his or her fingers. This condition is commonly referred to as "trigger finger." To treat trigger finger, the A1 pulley is typically cut, to release the tendon.

[0004] Trigger finger canoccur inanyof thefivefingers. Due to the orientation of the thumb relative to the hand and due to the anatomy of the thumb, treating trigger thumb presents different challenges than treating the other four fingers. Specifically, the locations of nerves and muscles in the thumb, relative to the A1 pulley and the flexorpollicis longus tendon, make accessing and cutting the A1 pulley to treat trigger thumb technically difficult.

[0005] Therefore, it would be advantageous to have improved devices and techniques for treating trigger thumb. Ideally, such techniques would be minimally in- vasive or less invasive than traditional surgical ap- proaches and would help prevent unwanted injury to surrounding neurovascular tissues. It would also be ad- vantageous if such devices and methods could be used or adapted for use in other parts of the body, such as treating trigger finger in the other fingers or for treating impingement, entrapment, and compressive syndromes in areas other than the hand. BRIEF SUMMARY

[0006] In oneaspect of thepresent disclosure, adevice for treating trigger thumb or trigger finger includes a handle, an introducer shaft extending from the handle, a blade shaft slidably disposed on the handle and the introducer shaft, a blade at or near a distal end of the blade shaft, a slider on the handle, attached to a proximal end of the blade shaft, for sliding the blade shaft and the blade distally and proximally along the introducer shaft, and a neurovascular guard slidably coupled with the handle and disposed over at least part of the blade shaft. In some embodiments, the neurovascular guard is made of a material that allows passage of ultrasound waves, such as but not limited to Ultem, PEEK, PPS, or other polymers. When the neurovascular guard is placed in an advanced position, a distal tip of the neurovascular guard may in someembodiments be located proximal of a distal tip of the introducer shaft, forming a gap through which the blade extends. The neurovascular guardmay include a protrusion, which fits into a slot on the handle to allow the neurovascular guard to slide along the handle.

[0007] In another aspect of the present disclosure, a method for treating a thumb of a patient may involve: advancing an introducer shaft of a treatment device between an A1 pulley of the thumb and a flexor pollicis longus (FPL) tendon of the thumb; advancing a neuro- vascular guard shaft of the treatment device over the A1 pulley; exposing a blade out of a gap between a distal tip of the introducer shaft andadistal tip of theneurovascular guard shaft: retracting the blade to cut the A1 pulley: and removing the treatment device from the thumb. In some embodiments, themethodmay further involve visualizing at least part of the method using an ultrasound device positioned outside of the patient’s hand. In some embo- diments, the neurovascular guard shaft is made of a material that allows the passage of ultrasound signals therethrough.

[0008] The method may optionally further involve re- tracting the neurovascular guard shaft before removing the treatment device from the thumb. In some embodi- ments, retracting the blade to cut the A1 pulley involves sliding a slider on a handle of the treatment device. In some embodiments, exposing the blade comprises ro- tating the slider relative to the handle.

[0009] In another aspect of the present disclosure, a device for cuttingasoft tissue inabody includesahandle, a shaft extending from the handle and comprising a distal opening, a blade housed within the shaft and configured to slide into and out of the distal opening in the shaft, and an anchoring tip attached to a distal end of the blade The device may also include a slider on the handle, attached to the blade, for advancing and retracting the blade out of and back into the distal opening of the shaft. In some embodiments, the blade includes at least two cutting edges.

[0010] The anchoring tip may be configured to anchor within another soft tissue, other than the soft tissue to be cut. In some cases, the anchoring tip has a sharp tip configured to pass through the soft tissue to be cut. For example, the soft tissuemaybeanA1pulley ina thumbof a human hand. In some embodiments, the device may 5 10 15 20 25 30 35 40 45 50 55 3 3 EP 4 710 889 A2 4 further include an introducer device through which the shaft, the blade, and the anchoring tip are introduced into a body. The introducer devicemay include a shaft portion madeof a firstmaterial anda tip portionmadeof a second material. At least the second material may allow at least partial transmission of ultrasound signals, so that a por- tion of a device residing under orwithin the tip portion can be visualized using ultrasound.

[0011] In yet another aspect of the present disclosure, a method for treating a thumb of a patient may involve: advancing an anchoring tip of a treatment device through a thenar muscle and an A1 pulley of the thumb and into a flexorpollicis longus (FPL) tendonof the thumb;exposing a blade of the treatment device between a shaft of the treatment deviceand theanchoring tip; flexing the thumb, while maintaining the position of the anchoring tip in the FPL tendon,whereuponflexionof the thumb, thebladeof the treatment device cuts the A1 pulley; covering the blade with the shaft; and removing the treatment device from the thumb. In some embodiments, exposing the blade involvesadvancing thebladeoutof adistal opening in the shaft, using a slide on a handle of the treatment device. Alternatively, exposing the blade may involve retracting the shaft relative to the anchoring tip after the anchoring tip is anchored in the FPL tendon. In some embodiments, the method may also involve advancing an introducer device trough the thenarmuscle, where the treatment device is advanced through the introducer device. In some embodiments, the method may further involve extending the thumb after flexing the thumb, to further cut the A 1 pulley.

[0012] In another aspect of the present disclosure, a conduit device for facilitating delivery of a treatment device to a treatment site in a human or animal body may include a shaft portion and a tip portion. The tip portion includes a first material that allows at least partial transmissionofultrasoundsignals through the tipportion, so that a portion of the treatment device residing under or within the tip portion can be visualized using ultrasound. For example, the shaft portion and the tip portion may be made of the first material. Alternatively, the tip portion may be made of the first material, and the shaft portion may be made of a second material attached to the tip portion. The tip portion may include an acoustic window . Examplesof the firstmaterial includebut arenot limited to ABS, polystyrene, nylon, polycarbonate, PETG copolye- ster, and glass-filled nylon. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1 is a top view of a trigger thumb treatment device, according to one embodiment; FIGS. 2A and 2B are perspective views of a distal portion of the trigger thumb treatment device of FIG. 1, shown in a blade active configuration (FIG. 2A) and a blade inactive configuration (FIG. 2B), accord- ing to one embodiment; FIG. 3 is a partial cross-sectional view of a portion of a thumb, illustrating a method of using the trigger thumb treatment device of FIGS. 1‑2B to cut the A1 pulley of the thumb, according to one embodiment; FIG. 4 is a top view, depicting a cross-sectional view of a portion of a thumb, illustrating amethod of using the triggertbumb treatment device of FIGS. 1‑2B to cut the A1 pulley of the thumb, according to one embodiment; FIGS. 5A and 5B are top perspective and side views, respectively, of a conduit device for use in treating trigger thumb, according to one embodiment; FIGS. 6A‑6C are side, partial cross-sectional views of a trigger thumb treatment system, according to an alternative embodiment: and FIGS. 6D and 6E illustrate a method of using the treatment device of FIGS. 6A‑6C; FIGS. 7A and 7B are top views of a trigger thumb treatment device, according to one embodiment; FIG. 7C is a top view of the trigger thumb treatment device of FIGS. 7A and 7B with a neurovascular guard removed; FIG. 7D is a top view of the neurovascular guard of the trigger thumb treatment device of FIGS. 7A and 7B; FIG. 8A is a top perspective view of the neurovas- cular guard of the trigger thumb treatment device of FIGS. 7A and 7B; FIG. 8B is a top view (lower panel) and front view (upper panel) of the neurovascular guard of FIG. 8A; FIG. 8C is a bottom view (lower panel) and rear view (upper panel) of the neurovascular guard of FIG. 8A; FIGS. 9Aand 9Bare lateral, cross-sectional views of a thumb and the trigger thumb treatment device, illustrating a method for treating trigger thumb, ac- cording to one embodiment: and FIG. 10 is a frontal, cross-sectional view of a portion of a thumb, illustrating a method for treating trigger thumb, according to one embodiment DETAILED DESCRIPTION

[0014] The soft tissue cutting devices and methods disclosed herein are primarily described for use in cutting an A1 pulley in a thumb to release / relieve tension on the flexor pollicis longus tendon and thus treat trigger thumb. In some embodiments, however, the trigger thumb treat- ment device may be used, or adapted for use, in other parts of the hand or body to cut other soft tissues. There- fore, although this application focuses on trigger thumb treatment, the devices and methods herein are not lim- ited to that use. Furthermore, while the following descrip- tions are believed to be complete, the embodiments described are examples only. Any given embodiment may include features of other described embodiments ormay be altered or adapted for alternative uses, without departing from the scope of the invention. 5 10 15 20 25 30 35 40 45 50 55 4 5 EP 4 710 889 A2 6

[0015] In this application, the term "distal" generally means "close toor inadirection toward target tissue,"and the term "proximal" generally means "farther from or in a direction away from the target tissue." In other words, proximal anddistal are relative terms.For example,when auser holdsa treatment deviceand inserts oneendof the treatment device intoapatient to performa treatment, the end of the device that is inserted into the patient will be referred to as the "distal end" of the device. Theendof the device being held by the physician will be referred to as the "proximal end" of the device. Although these terms will be used consistently in this application, they should not be interpreted as limiting.

[0016] Referring now to FIG. 1, one embodiment of a trigger thumb treatment device 10 (or simply "treatment device 10") is illustrated in top view. The treatment device 10 includes an anchoring tip 11 (or "tip anchor") attached to a blade 12,which extends to a blade shaft 14 (shown in broken lines as being covered). The treatment device 10 also includes a shaft 13 (or "outer shaft"), which is shown in FIG. 1 in cross section, so that the blade shaft 14 is visible within it. The shaft 13 is attached at its proximal end to ahandle 16,which includes finger grip contours 17 (or "finger grips"). A slide 15 is attached to the handle 16 and the blade shaft 14. The slide 15 can serve one or moreof several purposes. First, the slide 15can includea push-down or other locking / unlocking mechanism that releases the anchoring tip 11 to allow it to extend away from the shaft 13 and thus expose the blade 12. In alternative embodiments, this tip release function may be achieved by a different mechanism, such as a button. Second, the slide 15 may be used for advancing and / or retracting theblade12out of andback into the shaft 13. In some embodiments, the anchoring tip 11 may be an- chored in soft tissue released, and then the shaft 13 may be pulled proximally to expose the blade 12. The slide 15 may then be used, after the blade 12 has cut the target tissue, to pull the blade 12 back into the shaft 13 and the anchoring tip 11 back into contact with the shaft 13. In other embodiments, the slide 15 may also be used to advance the anchoring tip 11 at any point during the procedure.

[0017] The anchoring tip 11 has a sharp, pointed distal end, which facilitates passing it through soft tissue on the way to its targeted anchoring location. The blade 12 is flat andmayhaveoneormultiple cuttingedges.Asexplained further below, the anchoring tip 11 is anchored in soft tissue just beyond another soft tissue that is to be cut. After the anchoring tip 11 is anchored, the blade 12 is exposed, typically by retracting the shaft 13 proximally while the anchoring tip 11 remains in the same location. Thesoft tissue inwhich theanchoring tip11 isanchored is then moved in approximately a lateral direction, relative to the shaft 13, for example by having the patient flex and extend his / her thumb. This movement causes the an- choring tip 11 tomove theblade 12 through the soft tissue that is targeted for cutting, thereby cutting the tissue. Further details of this method and the treatment device 10 are provided below.

[0018] FIGS. 2A and 2B are perspective views of a distal portion of the trigger thumb treatment device 10, including a distal portion of the shaft 13, the blade 12, and the anchoring tip 11. The blade 12 may include multiple cutting edges 18, as shown. FIG. 2A illustrates the treat- ment device 10 in an active (or "blade active") configura- tion or position. In the active position, the anchoring tip 11 is extended distally away from the distal end of the shaft 13, and the blade 12 has been advanced out of an opening 24 in the distal end of the shaft 13 to expose the blade 12. It is in this active position that the blade 12 is used to cut the targeted soft tissue, such as the Al pulley in the thumb.

[0019] FIG. 2B illustrates the treatment device 10 in an inactive (or "blade inactive") configuration or position. Generally, the treatment device 10 is advanced into the patient and removed from the patient in the inactive position. In some cases, however, it may be acceptable to remove the device 10 from the patient in the active position. As evident fromFIGS. 2Aand 2B, the anchoring tip 11 may have a bullet shape with a sharp distal tip, which facilitates advancing the anchoring tip 11 through soft tissue with minimal or no tissue damage. Once the anchoring tip 11 is positioned in a desired location, the wider, proximal end of the anchoring tip 11 helps to hold it within the tissue.

[0020] FIG. 3 illustrates placement of the trigger thumb treatment device 10 in a thumb, where the anatomy around the thumb is shown in cross section and the trigger thumb treatment device 10 is shown from a side view. The illustrated portions of the thumb are the proper digital nerve 19, the thenar muscle 20, the flexor pollicis longus (FPL) tendon 21, the A1 pulley 22, and the first metacarpal bone 23. In use, the trigger thumb treatment device10maybeadvanced in aslightly obliquedirection, in its inactive configuration and using ultrasound gui- dance, through the patient’s skin, subcutaneous tissue, thenar muscle 20, and A1 pulley 22 near its radial origin. When the anchoring tip 11 has passed into the FPL tendon 21, the treatment device 10 is in the desired position. At this point, the slide 15 on the handle 16 of the treatment device 10 is used to release the anchoring tip 11 from the shaft 13, thus allowing the anchoring tip 11 to act as an anchor in the FPL tendon 21. In other embodiments, the slide 15 may be replaced by a button or other mechanism for releasing the anchoring tip 11. Once the anchoring tip 11 is released, the shaft 13 is pulled back proximally to expose the cutting blade 12 between the anchoring tip 11 and the distal end of the shaft 13. Ultrasound may be used to verify separation of the shaft 13 from the anchoring tip 11. The thumb is then flexed, for example by asking the patient to flex his / her thumb at the interphalangeal joint. Alternatively, the phy- sician may manually flex the patient’s thumb. In either case, flexion of the thumb causes the anchoring tip 11 to be pulled proximally within the A1 pulley 22, thus pulling the cutting blade 12 through the A1 pulley 22 and trans- 5 10 15 20 25 30 35 40 45 50 55 5 7 EP 4 710 889 A2 8 ecting it. The thumbmay be flexed and extendedmultiple times to ensure a complete transection. When the A1 pulley 22 is transected, the slide 15 on the handlemay be moved proximally along the handle to slide the cutting blade 12 back into the shaft 13 and to bring the anchoring tip 11 back toward the shaft 13. In this inactive config- uration, the trigger thumb treatment device 10 may be removed from the thumb.

[0021] FIG. 4 is a different illustration of themethod just described, froma topviewandwith apartial cross section of the thumb. In this illustration, the anchoring tip 11 starts at one end of the FPL tendon 21 (the top end in the drawing), and the shaft 13 of the treatment device is angleddownward through the thenarmuscle20and skin. As the thumbflexes, theFPL tendon21movesdownward in the drawing, the anchoring tip 11 moves with it and the shaft 13 rotates about an axis at or near the skin. The blade12movesdownward through theA1pulley 22, thus transecting it.

[0022] Referring now to FIGS. 5A and 5B, a conduit device 30 is illustrated, whichmay be used alongwith the trigger thumb treatment device 10. In alternative embodi- ments, the conduit device 30 may be used with other devices, such as trigger finger or carpal tunnel release devices. In this embodiment, the conduit device 30 in- cludesa shaft 32 anda tip 34. Theshaft 32 ismade froma first material, and the tip 34 is made from a second material. (Alternatively, the shaft 32 and the tip 34 may bemade from the samematerial.) Thematerial for the tip 34 is selected so that ultrasoundwaves can pass through it and thusallowauser to visualizeobjectswithin or below the tip 34, such as the anchoring tip 11 and / or other portionsof the trigger thumb treatment device 10. In other words, the tip 34 acts as an acoustic window that allows visualization of objects below it. The material of the shaft 32 is selected to have at least slightly different acoustic properties than thematerial of the tip34.Forexample, the shaft material may be denser, have greater impedance, and / or the like, when compared to the tip material. The shaft 32 and the tip 34maybeattached to oneanother via any suitable means, such as but not limited to welding or gluing. Theshaft 32maybemadeof any suitablemetal or polymer. Examples of materials for making the tip 34 include, but are not limited to, ABS, polystyrene, nylon, polycarbonate, PETG copolyester and glass-filled nylon.

[0023] In use, the conduit device 30 may be advanced through soft tissue to position the tip 34 at a desired treatment location. The trigger thumb treatment device 10 may then be advanced through the conduit device 30 and used to perform the procedure on the thumb. The tip 34 of the conduit device 30 allows for visualization of the distal end of the treatment device 10. In various embodi- ments, the conduit device 30 may be removed or left in place after initial placement of the treatment device 10.

[0024] Referring now to FIGS. 6A‑6E, one embodi- ment of a trigger thumb treatment device system 50 is illustrated, including a conduit device 35 (shown in cross- section in FIGS. 6C‑6E) and a tissue treatment device 45 (shown from a side view in FIGS. 6A‑6E). In some cases of trigger thumb, a sesamoid bone 41 may interfere with the transmuscular treatment approach described above. For such cases, the trigger thumb treatment system 50 illustrated in FIGS. 6A‑6E is designed to safely approach and cut the A1 pulley 22 when a sesamoid bone 41 is present. The conduit device 35 includes a shaft 40 and a blunt tip 39, similar to (or the same as) the embodiment described above. The blunt tip 39 allows the conduit device 35 to be used to push or displace the proper digital nerve 19 in an ulnar direction, safely exposing the palmar surface of the A1 pulley 22 for transection. The tissue treatment device 45 includes a blade 36 attached via a hinge 37 a blade shaft 38. When the blade shaft 38 is advanced distally, the blade 36 becomes exposed (ac- tive) through an opening 42 on an inferior surface of the conduit device 35 (FIGS. 6C and 6D). In this active position, the blade 36 can be used to engage with and cut the palmar surface of the A1 pulley 22 (FIG. 6D). The blade 36 is oriented in a horizontal fashion (Fig. 6A and Fig. 6B), allowing the device to transect the A1 pulley in a distal to proximal direction or vice versa. Fig. 6E shows the conduit device 35 with the blade 36 of the tissue treatment device 45 not exposed (inactive) next to the palmar proper digital nerve 19 in its normal position. Fig. 6D shows the conduit device 35with the tissue treatment device 45 in an active position (blade 36 exposed) over the FPL tendon 21 and the palmar aspect of theA1 pulley 22. In FIG. 6D, the conduit device 35 has been used to displace (move) the palmar proper digital nerve 19 in an ulnardirection,away from theexposedblade36.After the A1 pulley 22 is transected, the tissue treatment device 45 may be inactivated and removed with the conduit, as in FIG. 6E.

[0025] Referring now to FIGS. 7A‑7D, an alternative embodiment of a trigger thumb treatment device 100 is illustrated. The treatment device 100 includes a soft tissue cutting device 101 and a neurovascular guard 120. The soft tissue cutting device 101 is described in detail in U.S. Patent Application No. 17 / 733,532, entitled "CUTTING DEVICE FOR TRIGGER FINGER AND OTHER SOFT TISSUES," which was filed on April 29, 2022,andwhich ishereby incorporatedby reference in its entirety. In this embodiment, the soft tissue cutting device 101 includes a handle 102, a blade slider 104, an intro- ducer shaft 106 with an introducer tip 112, a blade 108, a blade shaft 109, and a slot 110 on the handle 102 for accommodating a portion of the neurovascular guard 120. The neurovascular guard 120 includes a guard handle 122, a textured finger slide 124 for enhancing finger gripping ability, a shaft 126, and an atraumatic tip 128. When assembled, as in FIGS. 7A and 7B, the neurovascular guard 120 fits into the slot 110, for exam- ple via snap fit, so that it can slide along the slot 110. The neurovascular guard 120 can be moved from a retracted position (FIG. 7A) to an advanced or extended position (FIG. 7B). In the extendedposition, the atraumatic tip 128 of the neurovascular guard 120 is positioned near the 5 10 15 20 25 30 35 40 45 50 55 6 9 EP 4 710 889 A2 10 introducer tip 112but not all theway there, leavinga small gap between the two tips 128, 112. This allows the blade 108 to be advanced to the introducer tip 112 and exposed within the gap between the two tips 128, 112. The treat- ment device 100may include a locking feature to lock the neurovascular guard 120 in the advanced position while performing a tissue cutting procedure.

[0026] The neurovascular guard 120 is designed to protect nerve tissue in the thumb from the blade 108 during a cutting procedure. As nerves in the thumb are typically closer to the area for cutting the A1 pulley than nerves in the other fingers are, the neurovascular guard 120 may be critically important for performing a safe trigger thumb release procedure with the device 100. In some embodiments, the neurovascular guard 120 is a monolithic structure made of a material that at least partially allows ultrasound waves to pass through it-in otherwords, theneurovascular guard120maybeat least partially ultrasound lucent. To achieve this property, the neurovascular guard 120 may be made of any suitable material, such as any polymer with physical properties that allow adequate through-transmission or posterior enhancement, such as Ultem, PEEK, PPS, or the like. This specificpolymerpropertywill allow theuser to create an ultrasound image deep to the neurovascular guard 120,makingvisible the introducer shaft 106and theblade 108 during placement and transection of the A1 pulley.

[0027] Referring now to FIGS. 8A‑8C, the neurovas- cular guard 120 is illustrated in further detail. FIG. 8A is a perspective view, FIG. 8B is a top view (bottom panel) and front view (top panel), and FIG. 8C is a bottom view (bottom panel) and rear view (top panel). These figures show that the neurovascular guard 120 may include a guard slot 130 and a prong 132. The prong 132 is con- figured to snap-fit down into the slot 110 on the handle 102of thedevice100.Theguardslot 130 is for receivinga longitudinal protrusion on the top surface of the handle 102, which is optional. These features are designed for connecting the neurovascular guard 120 to the handle 102 of the device 100 in a way that allows the neurovas- cular guard 120 to slide back and forth along the handle 102.

[0028] Referringnow toFIGS.9A, 9Band10, amethod for performing a trigger thumb release procedure using the trigger thumb treatment device 100 (shown in a side view in FIGS. 9A and 9B) will be described. First, the anatomy shown in the figures will be described, with FIGS. 9A and 9B being lateral, cross-sectional views, and FIG. 10 being a frontal, cross-sectional view. The anatomical parts shown in FIGS. 9A and 9B are a first metacarpal bone 150, a first proximal phalanx 151, a flexor pollicis longus (FPL) tendon 152, and an A1 pulley 153. FIG. 10 also shows radial and ulnar digital nerve branches 154, 155 and two sesamoid bones 156a, 156b.

[0029] Referring to FIG. 9A, in one method embodi- ment, after surgical preparation in a sterile field and local anesthetic, the thumb is positioned in the slight extended position with the palm up. With ultrasound guidance, a small (e.g., 5mm) horizontal incision is made approxi- mately at the mid-point between the interphalangeal (IP) crease and the metacarpal phalangeal (MCP) crease, in a distal to proximal direction, down to the FPL tendon. Then, the introducer tip 112 isused toprovidegentleblunt dissection of the region just superficial to the A1 pulley 153. Thereafter, the introducer tip 112 is advanced through the tendon sheath, superficial to the FPL tendon 152, and distally deep to the A1 pulley 153. The neuro- vascular guard 120 is unlocked and pushed via the finger slide 124 to the most distal position, so that the guard shaft 126 is superficial to the A1 pulley 153.

[0030] The slider 104 (or "blade handle") is then re- moved from the post and in the horizontal, inactive posi- tion, slid distally along the handle 102 to place the blade 108deep to theA1pulley153, asdepicted inFIG.9B.The slider 104 is then rotated approximately 90 degrees (counterclockwise), placing the blade 108 in the active (vertical) position. The slider 104 is then pulled proxi- mally, transecting the A1 pulley 153. The neurovascular guard120 is thenslid proximally. The introducer shaft 106 is then used to confirm complete A1 pulley transection and removed. If not confirmed, the above procedure is repeated by sliding the neurovascular guard 120 into place and repeating the cutting and confirmation proce- dure.

[0031] FIG. 10 shows the introducer shaft 106, the guard shaft 126, and the blade 108, in a position just before cutting the A1 pulley with the blade 108 in the active position. This view shows the proximity of nerves 154, 155 and thus the importance of the neurovascular guard 120.

[0032] Although the foregoing is believed to be a com- plete and accurate description of embodiments and fea- tures, the invention isnot limited to anyof theexamplesor embodiments described herein.

[0033] The invention is further described in the following numbered clauses 1. A device for treating trigger thumb or trigger finger, the device comprising: a handle; an introducer shaft extending from the handle; a blade shaft slidably disposed on the handle and the introducer shaft; a blade at or near a distal end of the blade shaft: a slider on the handle, attached to a prox- imal end of the blade shaft, for sliding the blade shaft and the blade distally and proxi- mally along the introducer shaft; and aneurovascular guardslidably coupledwith thehandleanddisposedover at least part of the blade shaft. 2. The device of clause 1,wherein the neurovascular guard is made of a material that allows passage of 5 10 15 20 25 30 35 40 45 50 55 7 11 EP 4 710 889 A2 12 ultrasound waves. 3. The device of clause 2, wherein the material is selected from the group consisting of Ultem, PEEK, PPS, and other polymers. 4. The device of clause 1, wherein when the neuro- vascular guard is placed in an advanced position, a distal tip of the neurovascular guard is located prox- imal of a distal tip of the introducer shaft, forming a gap through which the blade extends. 5.Thedevice of clause 1,wherein the neurovascular guard comprises a protrusion, wherein the handle comprises a slot, and wherein the protrusion fits into the slot to allow the neurovascular guard to slide along the handle. 6. A method for treating a thumb of a patient, com- prising: advancing an introducer shaft of a treatment device between an A1 pulley of the thumb and a flexor pollicis longus (FPL) tendon of the thumb; advancing a neurovascular guard shaft of the treatment device over the A1 pulley; exposingabladeout of agapbetweenadistal tip of the introducer shaft and a distal tip of the neurovascular guard shaft; retracting the blade to cut the A1 pulley: and removing the treatment device from the thumb. 7. Themethod of clause 6, further comprising visua- lizing at least part the method of using an ultrasound device positioned outside of the patient’s hand. 8. The method of clause 7, wherein the neurovas- cular guard shaft ismadeof amaterial that allows the passage of ultrasound signals therethrough. 9. The method of clause 6, further comprising re- tracting theneurovascular guardshaft before remov- ing the treatment device from the thumb. 10. The method of clause 6, wherein retracting the blade to cut the A1 pulley comprises sliding a slider on a handle of the treatment device. 11. The method of clause 10, wherein exposing the blade comprises rotating the slider relative to the handle. 12. A device for cutting a soft tissue in a body, the device comprising: a handle; a shaft extending from the handle and compris- ing a distal opening; a blade housed within the shaft and configured to slide into and out of the distal opening in the shaft; and an anchoring tip attached to a distal end of the blade. 13. The device of clause 12, further comprising a slider on the handle, attached to the blade, for ad- vancing and retracting the blade out of and back into the distal opening of the shaft. 14. The device of clause 12, wherein the blade comprises at least two cutting edges. 15. The device of clause 12, wherein the anchoring tip is configured to anchor within another soft tissue, other than the soft tissue to be cut. 16. The device of clause 15, wherein the anchoring tip comprises a sharp tip configured to pass through the soft tissue to be cut. 17. The device of clause 12, wherein the soft tissue comprises an A1 pulley in a thumb of a human hand. 18. The device of clause 12, further comprising an introducer device through which the shaft, the blade and the anchoring tip are introduced into a body, wherein the introducer device comprises: a shaft portion made of a first material; and a tip portionmade of a secondmaterial, wherein at least the second material allows at least par- tial transmission of ultrasound signals, so that a portionof adevice residingunder orwithin the tip portion can be visualized using ultrasound. 19. A method for treating a thumb of a patient, comprising: advancingananchoring tipof a treatmentdevice through a thenar muscle and an A1 pulley of the thumb and into a flexor pollicis longus (FPL) tendon of the thumb, exposing a blade of the treatment device be- tween a shaft of the treatment device and the anchoring tip; flexing the thumb,whilemaintaining the position of the anchoring tip in the FPL tendon, wherein upon flexion of the thumb, the blade of the treatment device cuts the A1 pulley; covering the blade with the shaft; and removing the treatment device from the thumb. 20. The method of clause 19, wherein exposing the blade comprises advancing the blade out of a distal opening in the shaft, using a slide on a handle of the 5 10 15 20 25 30 35 40 45 50 55 8 13 EP 4 710 889 A2 14 treatment device. 21. The method of clause 19, wherein exposing the blade comprises retracting the shaft relative to the anchoring tip after the anchoring tip is anchored in the FPL tendon. 22. The method of clause 19, further comprising advancing an introducer device trough the thenar muscle, wherein the treatment device is advanced through the introducer device. 23. The method of clause 19, further comprising extending the thumb after flexing the thumb, to further cut the A1 pulley. 24. A conduit device for facilitating delivery of a treatment device to a treatment site in a human or animal body, the conduit device comprising: a shaft portion; and a tip portion, comprising a first material that allows at least partial transmission of ultrasound signals through the tip portion, so that a portion of the treatment device residing under or within the tip portion can be visualized using ultra- sound. 25. The conduit device of clause 24, wherein the shaft portion and the tip portion are made of the first material. 26. The conduit device of clause 24, wherein the tip portion is made of the first material, and the shaft portion is made of a secondmaterial and is attached to the tip portion. 27. The conduit device of clause 24, wherein the tip portion comprises an acoustic window. 28. The conduit device of clause 24, wherein the first material is selected from the group consisting of ABS, polystyrene, nylon, polycarbonate, PETG co- polyester and glass-filled nylon. Claims 1. A device for cutting a soft tissue in a body, the device comprising: a handle; a shaft extending from the handle and compris- ing a distal opening; a blade housed within the shaft and configured to slide into and out of the distal opening in the shaft; and an anchoring tip attached to a distal end of the blade. 2. The device of claim 1, further comprising a slider on the handle, attached to the blade, for advancing and retracting the blade out of and back into the distal opening of the shaft. 3. The device of claim 1, wherein the blade comprises at least two cutting edges. 4. The device of claim 1, wherein the anchoring tip is configured to anchor within another soft tissue, other than the soft tissue to be cut. 5. The device of claim 4, wherein the anchoring tip comprises a sharp tip configured to pass through the soft tissue to be cut. 6. The device of claim 1, wherein the soft tissue com- prises an A1 pulley in a thumb of a human hand. 7. The device of claim 1, further comprising an intro- ducer device through which the shaft, the blade and the anchoring tip are introduced into a body, wherein the introducer device comprises: a shaft portion made of a first material; and a tip portionmade of a secondmaterial, wherein at least the second material allows at least par- tial transmission of ultrasound signals, so that a portionof adevice residingunder orwithin the tip portion can be visualized using ultrasound. 5 10 15 20 25 30 35 40 45 50 55 9 EP 4 710 889 A2 10 EP 4 710 889 A2 11 EP 4 710 889 A2 12 EP 4 710 889 A2 13 EP 4 710 889 A2 14 EP 4 710 889 A2 15 EP 4 710 889 A2 16 EP 4 710 889 A2 17 EP 4 710 889 A2 18 EP 4 710 889 A2 19 EP 4 710 889 A2 20 EP 4 710 889 A2 21 EP 4 710 889 A2 22 EP 4 710 889 A2 23 EP 4 710 889 A2 REFERENCES CITED IN THE DESCRIPTION This list of references cited by the applicant is for the reader’s convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard. Patent documents cited in the description • US 63304880

[0001] • US 63338726 B

[0001] • US 73353222

[0025] 摘 要 一種用於治療扳機拇指或扳機手指的裝置可以包括：手柄；從手柄延伸的導入軸； 可滑動地設置在手柄和導入軸上的刀片軸；位於刀片軸遠端處或遠端附近的刀片； 手柄上的滑塊，其接到刀片軸的近端，用於使刀片軸和刀片沿導入軸向遠端和近端 滑動；以及神經血管保護器，其可滑動地與手柄連接並設置在刀片軸的至少一部分 上。該神經血管保護器可以由允許超音波通過的材料製成，例如 Ultem，PEEK， PPS 或其他聚合物。

Claims

1. A device for cutting a soft tissue in a body, the device comprising: a handle; a shaft extending from the handle and comprising a distal opening; a blade housed within the shaft and configured to slide into and out of the distal opening in the shaft; and an anchoring tip attached to a distal end of the blade.

2. The device of claim 1, further comprising a slider on the handle, attached to the blade, for advancing and retracting the blade out of and back into the distal opening of the shaft.

3. The device of claim 1, wherein the blade comprises at least two cutting edges.

4. The device of claim 1, wherein the anchoring tip is configured to anchor within another soft tissue, other than the soft tissue to be cut.

5. The device of claim 4, wherein the anchoring tip comprises a sharp tip configured to pass through the soft tissue to be cut.

6. The device of claim 1, wherein the soft tissue comprises an A1 pulley in a thumb of a human hand.

7. The device of claim 1, further comprising an introducer device through which the shaft, the blade and the anchoring tip are introduced into a body, wherein the introducer device comprises: a shaft portion made of a first material; and a tip portion made of a second material, wherein at least the second material allows at least partial transmission of ultrasound signals, so that a portion of a device residing under or within the tip portion can be visualized using ultrasound.

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