Medical penetration and drainage for the treatment of glaucoma

Abstract

Methods and systems for treating glaucoma, the methods including placing an intraocular shunt in ocular tissue, whereby the shunt conveys fluid from the anterior chamber to a targeted outflow region within the eye, such as the suprachoroidal space and / or the subconjunctival space (or outside the conjunctiva).

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims priority to international patent application PCT / CN2021 / 093650, filed May 13, 2021, and entitled "Medical Penetration and Drainage for the Treatment of Glaucoma," the entire contents of which are incorporated herein by reference in their entirety for all purposes.

[0002] The present invention in some aspects relates to the field of medical devices and apparatus, and in particular to devices, kits, assemblies or systems for medical penetration and drainage. [Background technology]

[0003] Glaucoma is an eye disease that affects millions of people. Glaucoma is associated with increased intraocular pressure caused by the eye's drainage system failing to adequately remove aqueous humor from the anterior chamber of the eye or by the ciliary body in the eye producing excess aqueous humor. The buildup of aqueous humor and the resulting intraocular pressure can cause irreversible damage to the optic nerve and retina, potentially resulting in blindness. Glaucoma can usually be treated with surgery; however, improved methods remain necessary. The present invention addresses these and other needs. Summary of the Invention [Problem to be solved by the invention]

[0004] To address at least one of the deficiencies or shortcomings of existing devices and methods, in some embodiments, the present invention provides a medical puncture device and medical kit, assembly, or system for medical puncture that allows injection, access, dilation, and / or device implantation (e.g., shunt implant) into a target outflow area, the suprachoroidal or subconjunctival space, or between the target outflow area and an inflow area (e.g., the anterior chamber). The present invention provides an improved method for placing a shunt that is particularly useful for achieving precise control of puncture depth and needle placement, stable injection, and injection of a predetermined volume, and also facilitates drainage of fluid from the anterior chamber. [Means for solving the problem]

[0005] In some embodiments, a method for placing a shunt in an eye is provided, comprising: (a) inserting a needle into the eye to form a delivery passage in the eye that terminates at a target outflow region in the eye; (b) delivering a flowable composition through the needle to form an expanded space in the target outflow region; (c) positioning an inflow end of a shunt in the anterior chamber of the eye and an outflow end of the shunt in the expanded space, wherein the shunt is releasably coupled to the needle; and (d) releasing the needle from the shunt, thereby placing the shunt in the eye and providing fluid communication between the anterior chamber and the target outflow region.

[0006] In some embodiments, the needle penetrates the sclera. In any embodiment herein, the method may optionally include the step of cutting an area in the conjunctiva before the needle penetrates the sclera. In any embodiment herein, the needle penetrates the conjunctiva and the sclera, and the method may not include the step of cutting an area in the conjunctiva. In any embodiment herein, the target outflow area may be between the sclera and the choroid / ciliary body, and the expanded space may be the suprachoroidal space. In any embodiment herein, the positioning step may include positioning the distal end of the needle in the suprachoroidal space toward the anterior chamber angle.

[0007] In any of the embodiments herein, the shunt is within the needle, and optionally the shunt is within the needle body passage of the needle, or the shunt may form the sleeve around the needle.

[0008] In any embodiment herein, the positioning step may include advancing the shunt through / around the needle to the distal end of the needle. In any embodiment herein, the advancing may include pushing the shunt through / around the needle using a guidewire. In any embodiment herein, the positioning step may include piercing the distal end of the needle and / or the shunt into the anterior chamber angle. In any embodiment herein, the ejection step may include removing the needle and / or the guidewire from the eye, leaving the inflow end of the shunt in the anterior chamber and the outflow end of the shunt in the suprachoroidal space.

[0009] In any embodiment herein, the shunt may be coupled to the needle before or after the inserting step. In any embodiment herein, the shunt may be coupled to the needle before or after delivery of the flowable composition. In any embodiment herein, the shunt may be releasably coupled to the distal end of the needle.

[0010] In any embodiment herein, the positioning step may include positioning the shunt toward the anterior chamber angle. In any embodiment herein, the positioning step may include advancing the needle to pierce the distal end of the shunt into the anterior chamber angle. In any embodiment herein, the expelling step may include removing the needle, leaving the inflow end of the shunt in the anterior chamber and the outflow end of the shunt in the suprachoroidal space.

[0011] In any embodiment herein, the positioning step may include positioning the distal end of the needle in the suprachoroidal space away from the anterior chamber angle. In any embodiment herein, the shunt is within the needle, and optionally, the shunt is within a needle body passage of the needle, or the shunt may form a sleeve around the needle. In any embodiment herein, the positioning step may include advancing the shunt through / around the needle to the distal end of the needle. In any embodiment herein, the advancing may include pushing the shunt through / around the needle using a guidewire. In any embodiment herein, the positioning step may include positioning the outflow end of the shunt in the suprachoroidal space away from the anterior chamber angle. In any embodiment herein, the positioning step may include removing the needle from the eye, leaving the outflow end of the shunt in the suprachoroidal space.

[0012] In any embodiment herein, the method may further include piercing the anterior chamber angle to form an implant channel. In any embodiment herein, the inflow end of the shunt may be positioned in the anterior chamber through an implant channel. In any embodiment herein, the implant channel may be formed using the same needle or a different piercing element. In any embodiment herein, the same needle or a different piercing element may pierce the conjunctiva, the sclera, the suprachoroidal space, and the anterior chamber angle. In any embodiment herein, the needle may be inserted into the eye at a first entry point, and the same needle or a different piercing element may be inserted into the eye at a second entry point different from the first entry point to form the implant channel.

[0013] In any embodiment herein, the shunt may include a portion outside the sclera between the first and second entry points. In any embodiment herein, the shunt may include a portion outside the sclera and the conjunctiva between the first and second entry points. In any embodiment herein, the extrascleral portion may be subconjunctival. In any embodiment herein, the method may include incising an opening in the conjunctiva, peeling the conjunctiva from the sclera to form a conjunctival flap, positioning the inflow end of the shunt through the implant passage in the anterior chamber, and then suturing the opening in the conjunctival flap to cover the extrascleral shunt portion. In any embodiment herein, the extrascleral shunt portion includes a shunt body outflow port, and optionally, the shunt body outflow port may be subconjunctival.

[0014] In any embodiment herein, the method may further include applying an antimetabolite between the conjunctival flap and the sclera to modulate post-operative scarring.

[0015] In any of the embodiments herein, the needle may be inserted into the eye extraocularly or intraocularly.

[0016] In any embodiment herein, the target outflow area is between the conjunctiva and the sclera, and the expansion space is the subconjunctival space, which may optionally be a subconjunctival bleb. In any embodiment herein, the shunt is within the needle, and optionally the shunt is in a needle body passage of the needle, the shunt forms a sleeve around the needle, or the shunt may be releasably coupled to the distal end of the needle.

[0017] In some aspects, the present invention discloses a method for placing a shunt in an eye, comprising the steps of: (a) inserting a needle into the eye to form a delivery channel in the eye that terminates between the sclera and the choroid / ciliary body of the eye; (b) delivering a flowable composition through the needle to form a suprachoroidal space; (c) piercing the distal end of the needle and / or a shunt releasably coupled thereto into the anterior chamber angle of the eye; (d) positioning the shunt through the anterior chamber angle such that the inflow end of the shunt is in the anterior chamber and the outflow end of the shunt is in the suprachoroidal space; and (e) removing the needle from the eye, thereby placing the shunt in the eye and providing fluid communication between the anterior chamber and the suprachoroidal space.

[0018] In some aspects, the present invention provides a method for placing a shunt in an eye, comprising the steps of: (a) inserting a needle into the eye to form a delivery channel in the eye that terminates between the sclera and the choroid / ciliary body of the eye; (b) delivering a flowable composition with the needle to form a suprachoroidal space; (c) using the needle to position the outflow end of a shunt in the suprachoroidal space away from the anterior chamber angle; (d) piercing the anterior chamber angle of the eye to form an implant channel; and (e) positioning the inflow end of the shunt through the implant channel into the anterior chamber, thereby placing the shunt in the eye and providing fluid communication between the anterior chamber and the suprachoroidal space.

[0019] In any embodiment herein, a portion of the shunt may be outside the sclera. In any embodiment herein, the extrascleral shunt portion may be subconjunctival. In any embodiment herein, a portion of the shunt may be outside the sclera and conjunctiva. In any embodiment herein, the shunt may include a shunt body outflow port located outside the sclera and subconjunctiva and / or a shunt body outflow port located outside the conjunctiva. In any embodiment herein, the shunt may provide fluid communication between the anterior chamber and the suprachoroidal space and between the anterior chamber and the subconjunctival space. In any embodiment herein, the shunt may provide fluid communication between the anterior chamber and the suprachoroidal space and between the anterior chamber and the extraconjunctival space.

[0020] In some aspects, the present invention provides an intraocular method for placing a shunt in an eye, comprising: (a) inserting a needle and / or a shunt releasably coupled thereto through the cornea, across the anterior chamber, and into the suprachoroidal or subconjunctival space; (b) delivering a flowable composition through the needle and / or the shunt to the suprachoroidal or subconjunctival space; (c) positioning an inflow end of the shunt in the anterior chamber and an outflow end of the shunt in the suprachoroidal or subconjunctival space; and (d) removing the needle from the eye, thereby placing the shunt in the eye and providing fluid communication between the anterior chamber and the suprachoroidal or subconjunctival space.

[0021] In any of the embodiments herein, the shunt may include a pharmaceutical or biological agent.

[0022] In any embodiment herein, the method includes using a device including a syringe barrel including a proximal end and a distal end, a floating seal within the syringe barrel, a needle hub proximal to the floating seal, the floating seal and the needle hub resiliently engaging with each other, and a needle. In any embodiment herein, the needle includes (i) a needle proximal end engaging the needle hub, (ii) a needle distal end, (iii) a needle distal opening, (iv) a needle body opening between the needle proximal end and the needle distal end, the needle body opening being proximal to the needle distal opening, and (v) a needle body passage connecting the needle distal opening and the needle body opening. In any embodiment herein, the needle hub is configured to advance the needle distally toward and / or through the floating seal. In any embodiment herein, the floating seal may separate a proximal lumen and a distal lumen within the syringe barrel, the distal lumen containing the flowable composition. In any embodiment herein, the needle hub may be configured to advance the needle distally such that the needle distal opening is in the sclera and the needle body opening is in the distal lumen containing the flowable composition.

[0023] In any embodiment herein, the sclera can prevent the flowable composition in the distal lumen from exiting through the needle distal opening, and optionally, the backpressure at the needle distal opening on the sclera can be equal to or greater than the pressure in the distal lumen. In any embodiment herein, the needle base can be configured to advance the needle distally so that the needle body opening is in the distal lumen and the needle distal opening is between the sclera and adjacent tissue. In any embodiment herein, the needle distal opening is between the sclera and the choroid / ciliary body, and the flowable composition is delivered through the needle to the suprachoroidal space. In any embodiment herein, the needle distal opening can be between the sclera and the conjunctiva, and the flowable composition is delivered through the needle to the subconjunctival space.

[0024] In any embodiment herein, the flowable composition may comprise a liquid, solution, suspension, gel, oil, ointment, emulsion, cream, foam, lotion, and / or paste. In any embodiment herein, the shunt may be configured to advance distally through or along the needle and be exposed at the distal end of the needle when the needle reaches the target outflow area.

[0025] In some aspects, the invention provides a system comprising the needle, the shunt, and the flowable composition for use in the method of any of the embodiments.

[0026] In some aspects, the present invention provides a system for placing a shunt in an eye, the system comprising: a syringe barrel including a proximal end and a distal end; a floating seal within the syringe barrel; a needle hub proximal to the floating seal, the floating seal and the needle hub resiliently engaging each other; and a needle for insertion into the eye, the needle comprising: (i) a needle proximal end engaging the needle hub; (ii) a needle distal end; (iii) a needle distal opening; (iv) a needle body opening between the needle proximal end and the needle distal end, the needle body opening being proximal to the needle distal opening; and (v) a needle body passage connecting the needle distal opening and the needle body opening, the needle hub configured to advance the needle distally toward and / or through the floating seal; and the shunt configured to be releasably coupled to the needle. In some embodiments, the shunt may be an intraocular shunt within the needle.

[0027] In any embodiment herein, the shunt may comprise a solid structure, a porous structure, a multi-layer composite structure, a membrane stent structure, or any combination thereof. In any embodiment herein, the shunt may comprise one or more annular rings in a sidewall of the shunt. In any embodiment herein, the shunt may comprise a marker ring and a retaining ring in the sidewall of the shunt. In any embodiment herein, the shunt may comprise a plurality of channels extending from one end of the shunt to the other.

[0028] The accompanying drawings illustrate only certain embodiments possessing features and advantages of the present invention, and are not intended to limit the scope of the appended claims in any way. [Brief explanation of the drawings]

[0029] [Figure 1A] Schematic diagrams of various stages of operating an exemplary medical puncture device, for example, during puncture and injection into the suprachoroidal space (SCS) 14, are shown. [Figure 1B] Schematic diagrams of various stages of operating an exemplary medical puncture device, for example, during puncture and injection into the suprachoroidal space (SCS) 14, are shown. [Figure 1C] Schematic diagrams of various stages of operating an exemplary medical puncture device, for example, during puncture and injection into the suprachoroidal space (SCS) 14, are shown. [Figure 1D] Schematic diagrams of various stages of operating an exemplary medical puncture device, for example, during puncture and injection into the suprachoroidal space (SCS) 14, are shown. [Figure 1E] Schematic diagrams of various stages of operating an exemplary medical puncture device, for example, during puncture and injection into the suprachoroidal space (SCS) 14, are shown. [Figure 1F]For example, schematic diagrams of various stages of operating an exemplary medical puncture device during puncture and injection into the suprachoroidal space (SCS) 14 are shown. Figure 1F illustrates steps of operating an exemplary medical puncture device without a contact member (e.g., 1b shown in Figures 1A-1E), and the distal seal (e.g., 8 shown in Figures 1A-1E) may directly contact tissue. [Figure 2A] Schematic diagrams of various stages of operating an exemplary medical puncture device, for example, during puncture and injection into the suprachoroidal space (SCS) 14, are shown. [Figure 2B] Schematic diagrams of various stages of operating an exemplary medical puncture device, for example, during puncture and injection into the suprachoroidal space (SCS) 14, are shown. [Figure 2C] Schematic diagrams of various stages of operating an exemplary medical puncture device, for example, during puncture and injection into the suprachoroidal space (SCS) 14, are shown. [Figure 2D] Schematic diagrams of various stages of operating an exemplary medical puncture device, for example, during puncture and injection into the suprachoroidal space (SCS) 14, are shown. [Figure 2E] Schematic diagrams of various stages of operating an exemplary medical puncture device, for example, during puncture and injection into the suprachoroidal space (SCS) 14, are shown. [Figure 2F] For example, schematic diagrams of various stages of operating an exemplary medical puncture device during puncture and injection into the suprachoroidal space (SCS) 14 are shown. Figure 2F illustrates steps of operating an exemplary medical puncture device without a contact member (e.g., 1b shown in Figures 2A-2E), and the distal seal (e.g., 8 shown in Figures 2A-2E) may directly contact tissue. [Figure 3A] FIG. 1 is a partial structural view of an exemplary medical puncture device including a floating seal 3, one or more needle body openings (6b or 6b1, 6b2 and / or 6b3), and a needle distal opening 6a. [Figure 3B] FIG. 1 is a partial structural view of an exemplary medical puncture device including a floating seal 3, one or more needle body openings (6b or 6b1, 6b2 and / or 6b3), and a needle distal opening 6a. [Figure 3C]FIG. 1 is a partial structural view of an exemplary medical puncture device including a floating seal 3, one or more needle body openings (6b or 6b1, 6b2 and / or 6b3), and a needle distal opening 6a. [Figure 3D] FIG. 1 is a partial structural view of an exemplary medical puncture device including a floating seal 3, one or more needle body openings (6b or 6b1, 6b2 and / or 6b3), and a needle distal opening 6a. [Figure 3E] FIG. 1 is a partial structural view of an exemplary medical puncture device including a floating seal 3, one or more needle body openings (6b or 6b1, 6b2 and / or 6b3), and a needle distal opening 6a. [Figure 3F] FIG. 1 is a partial structural view of an exemplary medical puncture device including a floating seal 3, one or more needle body openings (6b or 6b1, 6b2 and / or 6b3), and a needle distal opening 6a. [Figure 4A] FIG. 1 is a partial structural view of an exemplary medical puncture device including a floating seal 3 and a needle body opening 6b. [Figure 4B] FIG. 1 is a partial structural view of an exemplary medical puncture device including a floating seal 3 and a needle body opening 6b. [Figure 4C] FIG. 1 is a partial structural view of an exemplary medical puncture device including a floating seal 3 and a needle body opening 6b. [Figure 5A] FIG. 1 is a partial structural view of an exemplary medical puncture device including floating seals 3a and 3b and one or more needle body openings (6b or 6b1 and / or 6b2). [Figure 5B] FIG. 1 is a partial structural view of an exemplary medical puncture device including floating seals 3a and 3b and one or more needle body openings (6b or 6b1 and / or 6b2). [Figure 5C] FIG. 1 is a partial structural view of an exemplary medical puncture device including floating seals 3a and 3b and one or more needle body openings (6b or 6b1 and / or 6b2). [Figure 5D]FIG. 1 is a partial structural view of an exemplary medical puncture device including floating seals 3a and 3b and one or more needle body openings (6b or 6b1 and / or 6b2). [Figure 5E] FIG. 1 is a partial structural view of an exemplary medical puncture device including floating seals 3a and 3b and one or more needle body openings (6b or 6b1 and / or 6b2). [Figure 5F] FIG. 1 is a partial structural view of an exemplary medical puncture device including floating seals 3a and 3b and one or more needle body openings (6b or 6b1 and / or 6b2). [Figure 6] 1 shows a partial structural view of an exemplary medical puncture device including a through-sloped guide groove 3a and a check valve 9. FIG. [Figure 7] 1 shows a partial structural view of an exemplary medical puncture device including a through-sloped guide groove 3a and a check valve 9. FIG. [Figure 8] 1 shows a partial structural view of an exemplary medical puncture device including a non-penetrating inclined guide groove 3a. [Figure 9] 1 shows a partial structural view of an exemplary medical puncture device including an inclined guide needle hole 6c and a check valve 9. FIG. [Figure 10] 1 shows a partial structural view of an exemplary medical puncture device including an angled guide needle hole 6c and a needle hole plug 10. FIG. [Figure 11A] 11A shows a schematic diagram of implanting a catheter 11 into an SCS 14 using an exemplary medical device assembly including a central guide groove 2c. FIG. 11A shows a contact member 1b contacting tissue. [Figure 11B] 11B shows a schematic diagram of implanting a catheter 11 into an SCS 14 using an exemplary medical device assembly including a central guide groove 2c. FIG. 11B shows the distal seal 8 contacting tissue without a contact member. [Figure 12] 1 illustrates an exemplary extraocular method for placing a shunt in the eye. [Figure 13A] 1 illustrates an exemplary extraocular method for placing a shunt in the eye. [Figure 13B] 1 illustrates an exemplary extraocular method for placing a shunt in the eye. [Figure 14A] 1 illustrates an exemplary intraocular method for placing a shunt in an eye. [Figure 14B] 1 illustrates an exemplary intraocular method for placing a shunt in an eye. [Figure 15A] 1A-1D show schematic diagrams of various stages of operating an exemplary medical lancing device. [Figure 15B] 1A-1D show schematic diagrams of various stages of operating an exemplary medical lancing device. [Figure 15C] 1A-1E through 11A-11B show schematic diagrams of various stages of operating an exemplary medical puncture device. The reference numerals and exemplary associated structures provided below are for illustrative purposes only and should not be construed as limiting, as shown, for example, in FIGS. 1A-1E through 11A-11B. 1—syringe barrel; 1a—axial stopper; 1b—circular contact element; 2—pressure element; 2c—central guide groove; 3—floating seal; 3a—angled guide groove; 4—elastic sheath; 5—spring; 6—hollow puncture needle; 6a—needle distal opening; 6b—needle body opening; 6c—angled guide needle bore; 7—flowable composition lumen; 8—distal seal; 9—check valve; 10—needle bore plug; 11—catheter; 12—auxiliary guide needle; 13—sclera; 14—suprachoroidal space (SCS). [Figure 16]A schematic diagram of various elements and features of an exemplary medical puncture device is shown. For example, the device may include a hollow housing 22 that engages a proximal control knob 17. A pusher shaft 2 slidably extends through the control knob and engages a guide tube 16 within the housing. The pusher shaft 2 is configured to apply a distal force to a compression spring 5, which functions as a force element configured to apply a distal force to a piston rod 15. A beveled needle 6 is assembled and secured to a needle base or seat secured to the pusher shaft. The distal end of the needle 6 may be located within the lumen of the piston rod 15 and moves distally when a force is applied to move the pusher shaft distally. The distal end of the needle may be advanced through a seal 3 at the distal end of the piston rod and into the lumen formed by the syringe barrel and distal seal 8 of the syringe 1. The gland 23 may engage both the syringe 1 and the distal seal 8 to facilitate sealing engagement. The distal seal 8 may interface with tissue, and the needle 6 may be advanced through the distal seal 8 to penetrate the tissue. The needle 6 may include a needle distal opening and a needle body opening, similar to 6a and 6b, respectively, shown in Figures 1A-1E-11A-11B. [Figure 17A] 1A-1D show schematic diagrams of various stages of operating an exemplary medical lancing device. [Figure 17B] 1A-1D show schematic diagrams of various stages of operating an exemplary medical lancing device. [Figure 17C] 1A-1D show schematic diagrams of various stages of operating an exemplary medical lancing device. [Figure 17D] 1A-1D show schematic diagrams of various stages of operating an exemplary medical lancing device. [Figure 17E] 1A-1D show schematic diagrams of various stages of operating an exemplary medical lancing device. [Figure 17F]17A-17F show schematic diagrams of various stages of operating an exemplary medical puncture device. The reference numerals and exemplary associated structures provided below are for illustrative purposes only and should not be construed as limiting, as shown, for example, in Figures 17A-17F. 1—syringe having a syringe barrel forming an internal cavity; 2—pressure element (e.g., pressurizing shaft); 3—floating seal (e.g., plunger seal); 5—elastic element such as a spring; 6—hollow puncture needle (needle distal opening and needle body opening not shown); 8—distal seal; 15—piston rod (e.g., push rod); 16—guide tube; 17—control knob; 18—limiter; 19—ruler; 20—adapter; 21—handle; 22—housing; 23—gland. [Figure 18A] 1 shows a schematic diagram of an exemplary shunt structure. [Figure 18B] 1 shows a schematic diagram of an exemplary shunt structure. [Figure 18C] 1 shows a schematic diagram of an exemplary shunt structure. [Figure 19A] 10A-10C show additional schematic diagrams of exemplary shunt structures, including a homogenous shunt, a shunt comprising a porous material, a shunt comprising multiple layers, and a shunt comprising a membrane-covered support. [Figure 19B] 10A-10C show additional schematic diagrams of exemplary shunt structures, including a homogenous shunt, a shunt comprising a porous material, a shunt comprising multiple layers, and a shunt comprising a membrane-covered support. [Figure 19C] 10A-10C show additional schematic diagrams of exemplary shunt structures, including a homogenous shunt, a shunt comprising a porous material, a shunt comprising multiple layers, and a shunt comprising a membrane-covered support. [Figure 19D] 10A-10C show additional schematic diagrams of exemplary shunt structures, including a homogenous shunt, a shunt comprising a porous material, a shunt comprising multiple layers, and a shunt comprising a membrane-covered support. [Figure 20A] 1 shows a schematic representation of the features of an exemplary container that can be pre-filled with a flowable composition and placed within the device. [Figure 20B]1 shows a schematic representation of the features of an exemplary container that can be pre-filled with a flowable composition and placed within the device. DETAILED DESCRIPTION OF THE INVENTION

[0030] The following is a detailed description of some embodiments of the present invention. It is understood that the specific embodiments described herein are intended to illustrate and interpret embodiments of the present invention and should not be considered limiting.

[0031] It should be noted that embodiments of the present invention and features of embodiments may be combined in any suitable manner where not inconsistent.

[0032] In some embodiments, positional descriptions such as "front," "rear," "forward," "rearward," "distal end," and "proximal end" are based on the perspective of a practitioner of the medical puncture device or medical device assembly, i.e., when the practitioner uses the medical puncture device or medical device assembly, the front direction is the direction relatively away from the practitioner, and the rear direction is the direction relatively closer to the practitioner.

[0033] As used herein, "proximal" and "distal" refer to directions toward and away from a practitioner (e.g., a surgeon, physician, nurse, technician, etc.) inserting a medical device into a patient, with the tip (distal end) of the device being inserted into the patient first. Thus, for example, the end of a needle (e.g., a microneedle) described herein that is inserted into the patient first is the distal end, and the opposite end of the needle (e.g., the end of the medical device that is manipulated by the practitioner) is the proximal end.

[0034] As used herein, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. For example, "a" and "an" refer to "at least one" or "one or more." Similarly, the term "element" means a single element or a combination of elements, and "material" means one or more materials or a combination thereof.

[0035] As used herein, the term "about" or "approximately" refers to a normal error range for the respective value, readily known to one of ordinary skill in the art. Reference herein to "about" a value or parameter includes (and describes) embodiments that are directed to the value or parameter itself. For example, "about" can mean within one standard deviation or more than one standard deviation, in accordance with practice in the relevant art. Alternatively, "about" can mean a range of up to 20%, up to 10%, up to 5%, or up to 1% of a given value.

[0036] Throughout this disclosure, various aspects are presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the disclosure. Accordingly, the description of a range should be considered to have specifically disclosed all possible subranges and individual numerical values ​​within that range. For example, when a range of values ​​is provided, it is understood that each intermediate value between the upper and lower limits of that range, as well as other stated or intervening values ​​within the stated range, are encompassed within the disclosure. The upper and lower limits of these smaller ranges may independently be included in the smaller ranges and are encompassed within the disclosure, subject to any specifically excluded limit in the stated range. When a stated range includes one or both of the limits, ranges excluding one or both of those included limits are also encompassed within the disclosure. This applies regardless of the broadness of the range.

[0037] The use of sequential numbering terms such as "first," "second," and "third" in the claims to modify claim elements does not imply a priority, precedence, or order of one claim element relative to other claim elements, or an order in which method actions should be performed, but is used solely as a label to distinguish one claim element having a particular name from other elements having the same name to distinguish the claim elements (provided the sequential numbering terms are used). Similarly, the use of a), b), etc., or i), ii), etc., does not imply a priority, precedence, or order of steps in the claims. Similarly, the use of these terms herein does not imply any desired priority, precedence, or order.

[0038] As used herein, the terms "puncture member" and "puncturing member" are used interchangeably to refer to an article, such as a needle or microneedle, configured to pierce a tissue layer and deliver a substance to a target tissue layer.

[0039] As used herein, the terms "medicine container" and "medicine chamber" are used interchangeably to refer to an article (e.g., a syringe) configured to contain a quantity of a substance (e.g., a medicine or drug).

[0040] All publications, including patent documents, scientific articles, and databases, referenced in this application are incorporated by reference in their entirety for all purposes to the same extent as if each individual publication were individually incorporated by reference. To the extent that a definition set forth herein contradicts or is inconsistent with a definition set forth in a patent, application, published application, or other publication incorporated herein by reference, the definition set forth herein takes precedence over the definition incorporated herein by reference.

[0041] The section headings used herein are for organizational purposes only and should not be construed as limiting the subject matter described.

[0042] I. Overview There are two main types of glaucoma: "open-angle" and "angle-closure." Open-angle glaucoma is a type of glaucoma in which the anterior chamber angle (drainage angle) of the eye remains open despite increased intraocular pressure. One common cause of open-angle glaucoma is blockage of the trabecular meshwork, the fluid channel that normally drains aqueous humor from the anterior chamber. Angle-closure glaucoma is a type of glaucoma in which the anterior chamber angle is partially or completely closed, resulting in increased intraocular pressure. In angle-closure glaucoma, swelling or movement of the iris closes the anterior chamber angle, preventing fluid from accessing the trabecular meshwork and, consequently, preventing aqueous humor from leaving the eye.

[0043] Glaucoma can be treated by a surgical procedure that involves placing a shunt within the eye to create a fluid flow path between the anterior chamber and various structures involved in aqueous humor drainage of the eye (e.g., Schlemm's canal, the sclera, or the subconjunctival space). This fluid flow path allows aqueous humor to exit the anterior chamber. The surgical procedure to implant the shunt may include inserting a delivery device that holds the intraocular shunt into the eye and deploying the shunt within the eye.

[0044] In some embodiments, a delivery device carrying a shunt enters the eye through the cornea (intraocular method) and is advanced through the anterior chamber. The delivery device is advanced through the sclera until the distal portion of the device approaches the drainage structures of the eye. The shunt is then deployed from the delivery device, creating a force pathway between the anterior chamber and various structures involved in aqueous humor drainage of the eye (e.g., Schlemm's canal, sclera, or subconjunctival space). In some embodiments, the delivery device carrying the shunt enters the eye using an extraocular method, which is inserted through the conjunctiva of the eye.

[0045] In one aspect, the present invention provides a method for placing a shunt in an eye, comprising: (a) inserting a needle into the eye to form a delivery passage in the eye that terminates at a targeted outflow area in the eye; (b) delivering a flowable composition through the needle to form an expanded space in the targeted outflow area; (c) positioning an inflow end of a shunt in the anterior chamber of the eye and an outflow end of the shunt in the expanded space, the shunt being releasably coupled to the needle; and (d) releasing the needle from the shunt, thereby placing the shunt in the eye and providing fluid communication between the anterior chamber and the targeted outflow area. The needle may be inserted into the eye extraocularly or intraocularly.

[0046] In one aspect, the present invention provides an extraocular method for placing a shunt in an eye, the method comprising: (a) inserting a needle into the eye to form a delivery channel therein that terminates between the sclera and the choroid / ciliary body of the eye; (b) delivering a flowable composition through the needle to form a suprachoroidal space; (c) inserting the distal end of the needle and / or a shunt releasably coupled thereto into the anterior chamber angle of the eye; (d) positioning the shunt through the anterior chamber angle so that an inflow end of the shunt is in the anterior chamber and an outflow end of the shunt is in the suprachoroidal space; and (e) removing the needle from the eye, thereby placing the shunt in the eye and providing fluid communication between the anterior chamber and the suprachoroidal space.

[0047] In another aspect, the present invention provides an extraocular method for placing a shunt in an eye, comprising the steps of: (a) inserting a needle into the eye to form a delivery channel in the eye that terminates between the sclera and the choroid / ciliary body of the eye; (b) delivering a flowable composition with the needle to form a suprachoroidal space; (c) using the needle to position an outflow end of the shunt in the suprachoroidal space away from the anterior chamber angle; (d) piercing the anterior chamber angle of the eye to form an implant channel; and (e) positioning the inflow end of the shunt through the implant channel into the anterior chamber, thereby placing the shunt in the eye and providing fluid communication between the anterior chamber and the suprachoroidal space.

[0048] In yet another aspect, the present invention provides an intraocular method for placing a shunt in an eye, the method comprising: (a) inserting a needle and / or a shunt releasably coupled thereto through the cornea, across the anterior chamber, and into the suprachoroidal space; (b) delivering a flowable composition through the needle and / or the shunt to the suprachoroidal space; (c) positioning an inflow end of the shunt in the anterior chamber and an outflow end of the shunt in the suprachoroidal space; and (d) removing the needle from the eye, thereby placing the shunt in the eye and providing fluid communication between the anterior chamber and the suprachoroidal space. In another aspect, the present invention provides an intraocular method for placing a shunt in an eye, the method comprising: (a) inserting a needle and / or a shunt releasably coupled thereto through the cornea, across the anterior chamber, and into the subconjunctival space; (b) delivering a flowable composition through the needle and / or the shunt to the subconjunctival space; (c) positioning an inflow end of the shunt in the anterior chamber and an outflow end of the shunt in the subconjunctival space; and (d) removing the needle from the eye, thereby placing the shunt in the eye and providing fluid communication between the anterior chamber and the subconjunctival space.

[0049] In some aspects, the methods and devices disclosed herein can be used in minimally invasive surgical treatment of glaucoma.

[0050] Other features and advantages of the present invention are described in the detailed description that follows.

[0051] Some embodiments of the present invention will now be described with reference to some figures of the accompanying drawings.

[0052] II. Systems and Devices In some embodiments, described herein are systems and devices that aid in inserting a puncture member (e.g., a needle or microneedle) into the eye and / or aid in injecting a pharmaceutical agent into a target ocular tissue. In some embodiments, described herein are systems and devices for controlling the depth to which a puncture member (e.g., a microneedle) is inserted into the eye, for example, to deliver a therapeutic agent to the posterior region of the eye (e.g., via the suprachoroidal space). In some embodiments, described herein are systems and devices for introducing an implant into tissue (e.g., into an apparent or potential tissue void, cavity, or blood vessel).

[0053] In some embodiments, a system is provided herein that includes a syringe barrel including a proximal end and a distal end, a floating seal within the syringe barrel, and a needle hub proximal to the floating seal (e.g., the needle hub closer to the practitioner and the floating seal closer to the test taker), where the floating seal and the needle hub are configured to resiliently engage with each other. In some embodiments, the system further includes a needle including a needle proximal end and a needle distal end, where the needle proximal end engages with the needle hub. In any embodiment herein, the needle proximal end may be fixed to the needle hub or may be releasably assembled to the needle hub (e.g., inserted). In any embodiment herein, the needle includes (i) a needle distal opening, (ii) a needle body opening between the needle proximal end and the needle distal end, and (iii) a needle body passageway connecting the needle distal opening and the needle body opening. In any embodiment herein, the needle body opening may be proximal to the needle distal opening. In any embodiment herein, the needle hub may be configured to advance the needle distally toward the floating seal (e.g., when the needle distal end is proximal to the floating seal), through the floating seal (e.g., when the needle distal end enters or pierces the floating seal), and / or through the distal end of a syringe barrel.

[0054] In any of the embodiments herein, the proximal and distal lumens may be located on different sides of the floating seal within the syringe barrel. In some embodiments, the distal lumen contains a flowable composition (e.g., a pharmaceutical agent, a drug, and / or a pharmaceutically acceptable carrier or excipient such as saline) and the proximal lumen does not contain a flowable composition other than a gas. The proximal lumen may be pre-filled with a gas such as sterile air and / or may communicate with an external environment, such as atmosphere, when the needle is advanced into and / or through the syringe barrel.

[0055] In some embodiments, the needles included in the embodiments described herein comprise a bevel that allows for easy penetration into tissues such as the sclera and / or suprachoroidal space while minimizing collateral damage. In some embodiments, the needles disclosed herein define a narrow lumen (e.g., gauge sizes 30 gauge, 32 gauge, 34 gauge, 36 gauge, etc., or larger) to allow for administration of pharmaceutical agents to the suprachoroidal space while minimizing the diameter of the needle track upon needle insertion. In some embodiments, the aspect ratio of the lumen and bevel of the needles described herein is the same as or different from the standard 27 gauge and 30 gauge needles commonly used for intraocular injections.

[0056] In some embodiments, the devices disclosed herein include or are configured to be coupled to a pharmaceutical container that contains a pharmaceutical agent (e.g., a gel, etc.), which may be formed at least in part from a syringe barrel.

[0057] In some embodiments, the needle is coupled to the distal end of the pharmaceutical container (e.g., a needle disposed at the distal end of a syringe), as described, for example, in U.S. Pat. Nos. 9,180,047, 9,539,139, 9,572,800, 9,636,253, 9,636,332, 9,770,361, 9,937,075, 10,555,833, and 10,517,756. In other embodiments, the present invention utilizes a needle connected to an actuation member within a syringe barrel. In some embodiments, the needles disclosed herein are at least partially disposed within the syringe barrel. In some embodiments, prior to use, the needle is not exposed at or directly engaged with the distal end of the syringe barrel.

[0058] In some embodiments, the devices disclosed herein include an energy storage member (e.g., one or more springs) configured to engage the needle hub and the floating seal. In some embodiments, the distal end of the energy storage member is disposed within the syringe barrel and configured to directly or indirectly engage the floating seal. In some embodiments, the energy storage member is configured to generate a force on the proximal end of the floating seal. In some embodiments, when the distal tip of the needle is disposed within an apparent or potential tissue void, cavity, or vessel, this force is sufficient to move the floating seal within the syringe barrel and deliver at least a portion of a substance from a pharmaceutical container (e.g., a flowable composition lumen) through the needle. Furthermore, when the distal tip of the needle is disposed near (e.g., above or below) an apparent or potential tissue void, cavity, or vessel, this force is not sufficient to move the floating seal within the syringe barrel. In some embodiments, the apparent or potential tissue void, cavity, or vessel has a first density, and an adjacent tissue has a second density higher than the first density. In some embodiments, an apparent or potential tissue void, cavity, or vessel generates a first backpressure, and adjacent tissue generates a second backpressure that is higher than the first backpressure.

[0059] In some embodiments, the needle is coupled to the floating seal. In other embodiments, the invention utilizes a needle with a proximal end coupled to an actuation member within a syringe barrel, the actuation member being separately located and proximal to the floating seal. In some embodiments, the proximal end of the needle disclosed herein is not coupled to the floating seal. In some embodiments, prior to use, the needle may be distal to the floating seal or may pass through the floating seal, but the proximal end of the needle is held distal to the floating seal and is not fixedly assembled to the floating seal.

[0060] In some embodiments, a medication container (e.g., containing a liquid) is positioned between the proximal seal and the distal seal, and each seal is movable within the syringe barrel, as described, for example, in US 2020 / 0069883, which is incorporated herein by reference for all purposes. In these devices, force from the proximal side of the proximal seal is transmitted via the liquid to the distal seal assembled to the needle. Because liquids are generally incompressible, if the practitioner uses excessive force or suddenly applies force to the proximal seal (e.g., via a plug coupled to the proximal seal), the force is transmitted to the needle. Because liquids offer little compressibility to buffer the force impact, inserting the needle too deeply or too suddenly can damage the target tissue (e.g., the suprachoroidal space) and / or surrounding tissue. While the positions of the proximal and distal seals can be observed during injection, if a force is applied that could cause the needle to overshoot, it may be too late to stop the needle movement due to the lack of ability to buffer the force impact.

[0061] Meanwhile, in other embodiments of the present invention, a pharmaceutical container (e.g., a flowable composition lumen) is disposed between a floating seal and the distal end of the syringe barrel (the distal end does not move relative to the syringe barrel). In some embodiments, the distal end of the syringe barrel includes a distal seal, and the flowable composition lumen is disposed between the floating seal and the distal seal. In some embodiments, the needle base is resiliently connected to the floating seal (and thereby to the flowable composition), which is advantageous for allowing the practitioner to apply the correct force and cushion the impact of that force. Furthermore, the practitioner can hold the needle base stationary relative to the syringe barrel and observe the movement of the floating seal to assess the needle placement depth. Once fluid communication between the flowable composition and an apparent or potential tissue void, cavity, or vessel is established and the pressure within the flowable composition is greater than the pressure within the apparent or potential tissue void, cavity, or vessel, the floating seal can move as the flowable composition enters the tissue without moving the needle and the needle base. This allows for accurate needle placement and stable injection, effectively reducing or eliminating the chance of needle overshoot.

[0062] In some embodiments, the devices disclosed herein are provided and / or packaged as an integrated device including components that engage with each other. In some embodiments, the devices disclosed herein do not require the practitioner to assemble one or more components prior to use. In some embodiments, the devices disclosed herein include a pre-filled pharmaceutical container (e.g., a flowable composition lumen) that includes a flowable composition, such as a pharmaceutical product in the form of a liquid, solution, suspension, gel, oil, ointment, emulsion, cream, foam, lotion, and / or paste.

[0063] Flowable compositions include liquids (e.g., solutions, suspensions, etc.) or semi-solid compositions (e.g., gels) that are easily manipulated and can be injected, molded, and / or cast at or near a target tissue site upon solidification. "Flowable" includes high-viscosity formulations, such as viscoelastic or paste-like materials, as well as formulations with low viscosity or water-like consistencies. In some embodiments, the methods disclosed herein include injecting a viscoelastic material (e.g., a viscoelastic fluid) into the eye, e.g., between the sclera and choroid / ciliary body of the eye, to form a suprachoroidal space containing the viscoelastic material. In some embodiments, the viscoelastic fluid is a non-Newtonian fluid formed of a viscous component and an elastic component, e.g., a mixture of a solvent and a polymeric material. Examples of viscoelastic materials that can be used in the present invention include sodium hyaluronate, Provisc (a 1% viscous transparent material that is a specific fraction of sodium hyaluronate), Viscoat (a dispersed viscoelastic material containing sodium hyaluronate and chondroitin sulfate), Amvisc (a purified fraction of sodium hyaluronate), Amvisc Plus (a 1.6% sodium hyaluronate product derived from chicken combs), sodium chondroitin sulfate / sodium hyaluronate, and DisCoVisc (4% sodium chondroitin sulfate, 1.65% sodium hyaluronate).

[0064] In various embodiments, the flowability of the formulation allows it to conform to irregularities, gaps, cracks, and / or voids in a tissue site. For example, in various embodiments, the formulation can be used to fill one or more voids, expand a tissue void (e.g., an apparent tissue void), and / or create a tissue void from a latent tissue void, and expand the created void as needed. In some embodiments, the flowable composition may harden upon contact with an aqueous medium (e.g., bodily fluids, water, etc.) to form a drug depot that controls drug release.

[0065] In some embodiments, a therapeutic agent (e.g., a drug) is added to the flowable composition. Non-limiting examples of specific drugs and drug classes include β-adrenergic receptor antagonists (e.g., carteolol, cetamolol, betaxolol, levobunolol, metipranolol, timolol), miotics (e.g., pilocarpine, carbachol, physostigmine), sympathomimetics (e.g., adrenaline, dipivefrine), carbonic anhydrase inhibitors (e.g., acetazolamide, dorzolamide), anhydrase inhibitors (e.g., acetazolamide, dorzolamide), Antibacterial compounds, including topoisomerase inhibitors (e.g., topotecan, irinotecan, camptothecin, lamellarin D, etoposide, teniposide, doxorubicin, mitoxantrone, amsacrine), prostaglandins, antibacterial and antifungal agents (e.g., chloramphenicol, chlortetracycline, ciprofloxacin, framycetin, fusidic acid, gentamicin, neomycin, norfloxacin, ofloxacin, polymyxin, propamidine, tetracycline) , tobramycin, quinolines), antiviral compounds (e.g., acyclovir, cidofovir, idoxuridine, interferon), aldose reductase inhibitors, anti-inflammatory and / or antiallergic compounds (e.g., steroid compounds such as triamcinolone, betamethasone, clobetasone, dexamethasone, fluorometholone, hydrocortisone, prednisolone, and antazoline, bromfenac, diclofenac, indomethacin, lodoxamide, saprofen, These include nonsteroidal compounds such as benzocaine, benzodiazepine, and sodium cromoglycate, artificial tears and dry eye treatments, local anesthetics (e.g., amethocaine, lignocaine, oxybuprocaine, and proxymetacaine), growth factors such as cyclosporine, diclofenac, urogastrone, epidermal growth factor, mydriatics, cycloplegics, mitomycin C, and collagenase inhibitors, and medications for age-related macular degeneration such as pegagtanib sodium, ranibizumab, aflibercept, and bevacizumab.

[0066] In one embodiment, the therapeutic agent is an integrin antagonist, a selectin antagonist, an adhesion molecule antagonist (e.g., intercellular adhesion molecule (ICAM)-1, ICAM-2, ICAM-3, platelet endothelial adhesion molecule (PCAM), vascular cell adhesion molecule (VCAM)), a leukocyte adhesion-inducing cytokine or growth factor antagonist (e.g., tumor necrosis factor-α (TNF-α), interleukin-1 beta (IL-1β), monocyte chemotactic protein-1 (MCP-1), or vascular endothelial growth factor (VEGF)). In some embodiments, a vascular endothelial growth factor (VEGF) inhibitor is used in conjunction with one of the microneedles described herein. In some embodiments, two drugs are delivered by the methods described herein. The compounds may be administered sequentially in one formulation or in two separate formulations. For example, both a VEGF inhibitor and a VEGF are provided. In some embodiments, the VEGF inhibitor is an antibody, such as a humanized monoclonal antibody. In a further embodiment, the VEGF antibody is bevacizumab. In another embodiment, the VEGF inhibitor is ranibizumab, aflibercept, or pegaptanib. In other embodiments, the devices and methods described herein can be used to deliver one or more of the following VEGF antagonists: AL8326, 2C3 antibody, AT001 antibody, HyBEV, bevacizumab (Avastin), ANG3070, APX003 antibody, APX004 antibody, ponatinib (AP24534), BDM-E, VGX100 antibody (VGX100 CIRCADIAN), VGX200 (c-fosInducible growth factor monoclonal antibody), VGX300, COSMIX, DLX903 / 1008 antibody, ENMD2076, Sutent (sunitinib malate), INDUS815C, R84 antibody, KD019, NM3, allogeneic mesenchymal progenitor cells in combination with anti-VEGF agents or antibodies, MGCD265, MG516, VEGF-receptor kinase inhibitor, MP0260, NT503, anti-DLL4 / VEGF bispecific antibody, PAN90806, Palomid529, BD0801 antibody, XV615, lucitanib (AL3810, E3810), AMG706 (motesanib diphosphate), AAV2-sFLT01, soluble Flt 1 receptor, cediranib (Resentin), AV-951 (tivozanib, KRN-951), Stivarga (regorafenib), volasertib (BI6727), CEP11981, KH903, lenvatinib (E7080), telameprocol (EM1421), ranibizumab (Lucentis), Votrient (pazopanib hydrochloride), PF00337210, PRS050, SP01 (curcumin), carboxyamidotriazole orotate, hydroxychloroquine, linifanib (ABT869, RG3635), Irubian (fluocinolone acetonide), ALG1001, AGN150998, DARPinMP0112, AMG386, ponatinib (AP24534), AVA101, valgatef (nintedanib), BMS690514, KH902, golvatinib (E7050), Afinitor (everolimus), dovitinib lactate (TKI258, CHIR258), ORA101, ORA102, axitinib (Inrita, AG013736), plitidepsin (Aplidin), lenvatinib mesylate, P TC299, aflibercept (Zaltrap, Eylea), pegaptanib sodium (Macugen, LI900015), Visudyne (Verteporfin), bucillamine (Rimatil, Lamin, Brimani, Lamit, Boomiq), R3 antibody, AT001 / r84 antibody, troponin (BLS0597), EG3306, vatalanib (PTK787), Bmab100, GSK21367 73, anti-VEGFR alterase, Avila, CEP7055, CLT009, ESBA903, HuMax-VEGF antibody, GW654652, HMPL010, GEM220, HYB6 76, JNJ17029259, TAK593, XtendVEGF antibody, Nova21012, Nova21013, CP564959, smart anti-VEGF antibody, AG028262, AG13958, CVX241, SU14813, PRS055, PG501, PG545, PT1101, TG100948, ICS283, XL647, enzastaurin hydrochloride (LY317615), BC194, quinoline, COT601M06.1, COT604M06.2, MabionVEGF, spheres conjugated to SIR-anti-VEGF or VEGF-R antibodies, apatinib (YN968D1), and AL3818. Additionally, delivery of VEGF inhibitors or VEGF antagonists using the microneedle devices and methods disclosed herein may be in combination with one or more agents described herein or with other agents known in the art.

[0067] In some embodiments, one or more components of a system or device disclosed herein are configured to assemble with one another. For example, the system or device may include one or more syringe barrels.

[0068] In some embodiments, the system or device may include two or more units, such as a first syringe unit including a first syringe barrel, a needle hub within the first syringe barrel, and a needle including a proximal needle end and a distal needle end that engages the needle hub. In some embodiments, the system or device may include a second syringe unit configured to engage a distal end of the first syringe unit including a second syringe barrel, the second syringe unit including a second syringe barrel and a floating seal located within the second syringe barrel, the floating seal configured to resiliently engage the needle hub when the first syringe unit and the second syringe unit are engaged. In some embodiments, the system or device may include a third syringe unit configured to engage a distal end of the second syringe unit, the third syringe unit including a third syringe barrel containing a flowable composition, the needle hub configured to advance the needle to position the proximal needle end and / or the distal needle end in the flowable composition. In any embodiment herein, the system or device may include one or more syringe units, and optionally a fourth syringe unit configured to engage a distal end of the third syringe unit.

[0069] In some embodiments, the system or device includes a first syringe unit, the first syringe unit including: a first syringe barrel; a needle base and a floating seal within the first syringe barrel that resiliently engage with each other, the needle base being proximal to the floating seal; and a needle including a proximal needle end and a distal needle end that engages with the needle base, the needle including: (i) a needle distal opening; (ii) a needle body opening between the proximal needle end and the distal needle end, the needle body opening being proximal to the needle distal opening; and (iii) a needle body passage connecting the needle distal opening and the needle body opening. In some embodiments, the system or device may further include a second syringe unit, the second syringe unit configured to engage a distal end of the first syringe unit and including a second syringe barrel containing a flowable composition, and the needle hub configured to advance the needle to position the proximal needle end and / or the distal needle end in the flowable composition. In any embodiment herein, the device may include one or more syringe units, and optionally, a third syringe unit configured to engage a distal end of the second syringe unit.

[0070] In some embodiments, the system or device may include a first syringe unit, the first syringe unit including a first syringe barrel, a needle base within the first syringe barrel, and a needle including a proximal needle end and a distal needle end that engages the needle base, the needle including: (i) a needle distal opening; (ii) a needle body opening between the proximal needle end and the distal needle end, the needle body opening being proximal to the needle distal opening; and (iii) a needle body passage connecting the needle distal opening and the needle body opening. In some embodiments, the system or device may further include a second syringe unit configured to engage the distal end of the first syringe unit, the second syringe unit including a second syringe barrel, a floating seal within the second syringe barrel configured to resiliently engage a needle hub when the first syringe unit and the second syringe unit are engaged, and a flowable composition, the needle hub configured to advance the needle to position the needle proximal end and / or the needle distal end in the flowable composition. In any embodiment herein, the device may include one or more syringe units, and optionally a third syringe unit configured to engage the distal end of the second syringe unit.

[0071] In some embodiments, the present invention provides a syringe barrel including a distal closed end and a proximal open end; an actuation unit (e.g., a resilient displacement unit) including an actuation member (e.g., a presser element) and a floating seal, the floating seal being positioned within the syringe barrel and resiliently engageable with the actuation member (e.g., the presser element); and a hollow puncture needle assembled to the actuation member (e.g., the presser element), the hollow puncture needle including a needle distal opening and a needle body opening, the needle body opening being proximal to the floating seal. a hollow puncture needle (the needle distal opening may be proximal to the floating seal, e.g., the entire length of the needle may be proximal to the floating seal, or alternatively, the needle may pass through the floating seal such that the needle distal opening is distal to the floating seal), and a flowable composition lumen (e.g., for a fluid or gel) formed by the distal closed end of the syringe barrel, a lumen wall of the syringe barrel (e.g., a portion of the syringe barrel), and the floating seal.

[0072] In some embodiments, the medical puncture device is configured to move the hollow puncture needle forward by pressing the actuation member (e.g., a presser element). In some embodiments, the hollow puncture needle sequentially pierces the floating seal and the distal closed end of the syringe barrel, thereby connecting the flowable composition lumen, the needle body opening, and the needle distal opening. In some embodiments, the hollow puncture needle is pre-inserted into the floating seal. For example, the needle distal opening may be within and blocked by the floating seal, and the needle may advance through the flowable composition lumen and pierce the distal closed end of the syringe barrel. In some embodiments, the hollow puncture needle is pre-inserted through the floating seal. For example, the needle distal opening may be within the flowable composition lumen, while the needle body opening may be proximal to or within the floating seal (e.g., the needle body opening may be blocked by the floating seal, as shown in FIG. 3E), after which the needle may be advanced to pierce the distal closed end of the syringe barrel. In some embodiments, a hollow puncture needle is pre-inserted through the floating seal into or through the distal closed end of the syringe barrel. For example, the needle distal opening may be within a distal seal at the distal closed end of the syringe barrel (e.g., the needle distal opening may be blocked by the distal seal), or may be distal to the distal seal and / or the distal closed end of the syringe barrel, while the needle body opening may be proximal to the floating seal (e.g., see FIG. 3D, 6b1), within the floating seal (e.g., the needle body opening may be blocked by the floating seal, as shown in FIG. 3D, 6b2), or within the flowable composition lumen (e.g., see FIG. 3D, 6b3), and the needle may then be advanced through the distal closed end of the syringe barrel to expose the needle distal opening for puncturing tissue.

[0073] Optionally, the medical puncture device includes a state in which the flowable composition lumen, the needle body opening, and the needle distal opening are in fluid communication. For example, in the fluid communication state, the needle body opening may be proximal to the floating seal, while the needle distal opening may be distal to the floating seal and within the flowable composition lumen. In the fluid communication state, the needle and / or the floating seal are movable. For example, the floating seal may move under the action of elasticity between the floating seal and the actuation member (e.g., a hold-down element) to seal or block the needle body opening, thereby preventing or stopping the flowable composition (e.g., a gel) from being discharged from the needle body opening and / or the needle distal opening.

[0074] Optionally, in a fluid communication state, the floating seal can seal the needle body opening when it moves forward and contacts the syringe barrel distal closed end, thereby preventing or stopping a flowable composition (e.g., a gel) from being expelled from the needle body opening and / or the needle distal opening.

[0075] Optionally, a stopper, such as an axial stopper, may be disposed within the syringe lumen distal to the floating seal. In some embodiments, the stopper may limit forward movement of the floating seal. In some embodiments, the medical puncture device includes a flowable composition lumen in fluid communication with a needle body opening and a needle distal opening. When the medical puncture device is in fluid communication, the needle body opening may be at the distal end of the stopper (e.g., FIG. 2D ), and the floating seal may move forward due to resilient engagement with the actuation member (e.g., a holddown element).

[0076] Optionally, said medical puncture device includes a manual control element assembled to the floating seal and extending outside the syringe barrel.

[0077] Optionally, said medical puncture device includes a pre-puncture state after the hollow puncture needle pierces the closed distal end of the syringe barrel, a superficial tissue puncture state, and a post-puncture fluid communication state. In the pre-puncture state, the superficial tissue puncture state, and the fluid communication state, the range of the length of the hollow puncture needle extending outside the closed distal end of the syringe barrel may correspond to a pre-puncture length range, a superficial tissue puncture length range, and a fluid communication length range, respectively, wherein when the length of the hollow puncture needle extending outside the closed distal end of the syringe barrel is within the pre-puncture length range, the needle body opening is maintained above the flowable composition lumen (e.g., the needle body opening may be proximal to and within the floating seal), and / or when the length of the hollow puncture needle extending outside the closed distal end of the syringe barrel is within the superficial tissue puncture length range, at least a portion of the needle body opening is connected to the flowable composition lumen, and / or when the length of the hollow puncture needle extending outside the closed distal end of the syringe barrel is within the fluid communication length range, the needle body opening is located within the flowable composition lumen.

[0078] Optionally, the syringe barrel distal closed end is formed with an axially extending circular contact element, the difference between the upper and lower limits of the pre-puncture length range being equal to the axial length of the circular contact element.

[0079] Optionally, the elastic moving unit includes an elastic sheath covering the outside of the hollow puncture needle. The elastic sheath can seal the needle body opening when the needle body opening is proximal to the floating seal. In some embodiments, when the flowable composition is a gel, it may not be necessary to seal the needle body opening when the needle body opening is proximal to the floating seal.

[0080] Optionally, the medical puncture device includes a catheter guiding structure for passing a catheter through a cavity of the hollow puncture needle (e.g., a needle body passage connected to a needle distal opening and / or a needle body opening).

[0081] Optionally, the catheter guidance structure includes an angled guide groove formed on the floating seal and extending at an angle towards the hollow puncture needle.

[0082] Optionally, the inclined guide groove is provided to penetrate the floating seal in a front-to-rear direction. In some embodiments, the catheter guidance structure further includes a check valve embedded in the inclined guide groove and capable of opening and closing, and / or a guide groove plug inserted into the inclined guide groove.

[0083] Optionally, the inclined guide groove is provided on an upper surface of the floating seal and is a non-through groove.

[0084] Optionally, the needle body opening is configured as a beveled opening that opens at an angle to the rear.

[0085] Optionally, the catheter guidance structure includes a beveled guide needle hole formed in a body wall of the hollow puncture needle and opening at an angle backward. In some embodiments, the medical puncture device includes a fluid communication state in which the flowable composition lumen is connected to the needle body opening and the needle distal opening. In the fluid communication state, the beveled guide needle hole is proximal to the floating seal.

[0086] Optionally, the catheter guidance structure further includes a check valve embedded in the beveled guide needle bore and capable of being opened and closed, or a guide groove plug inserted into the beveled guide needle bore.

[0087] Optionally, the catheter guidance structure includes a puncturable central guide groove formed in a center of a proximal surface of the actuation member (e.g., a retainer element). In some embodiments, a needle proximal opening is formed in a hollow puncture needle, the needle proximal opening being arranged to be axially aligned with the central guide groove.

[0088] Optionally, the medical puncture device includes a puncture control module and a fluid storage module that are independently manufactured and formed, wherein the puncture control module includes a first syringe unit, and an elastic movement unit and a hollow puncture needle formed inside the first syringe unit, and the fluid storage module includes a second syringe unit, the flowable composition lumen formed in the barrel of the second syringe unit, and a modular packaging component removably packaged proximal to the second syringe unit, and a detachable connection structure is formed between the first syringe unit and the second syringe unit.

[0089] In a second aspect, the present invention provides a medical device assembly, hi some embodiments, the medical device assembly includes a catheter and a medical puncture device including a catheter guidance structure.

[0090] Optionally, the medical device assembly further includes a hollow auxiliary guide needle adapted for use with the catheter guide structure. In some embodiments, when the auxiliary guide needle is connected to the catheter guide structure, the catheter can be passed through the needle body passage of the hollow puncture needle, sequentially through the needle body passage of the auxiliary guide needle and the catheter guide structure.

[0091] In some embodiments, when using the medical puncture device of the present invention, a user can first apply pressure to an actuation member (e.g., a hold-down element) to sequentially pass the hollow puncture needle through the floating seal and the closed distal end of the syringe barrel. When the needle distal opening of the hollow puncture needle reaches an apparent or potential tissue void, cavity, or blood vessel, the needle body opening is positioned within the flowable composition lumen, and the floating seal resiliently engages the actuation member (e.g., a hold-down element). In some embodiments, the fluid pressure within the flowable composition lumen may be higher than the pressure within the apparent or potential tissue void, cavity, or blood vessel.

[0092] At this time, fluid within the flowable composition lumen may flow through the needle body opening and the needle distal opening into an apparent or potential tissue void, cavity, or blood vessel. Due to the elastic engagement between the floating seal and the actuating member (e.g., a pusher element), fluid within the flowable composition lumen can flow into the needle body opening (and then through the needle body passage and out the needle distal opening) simply by maintaining the position of the actuating member (e.g., a pusher element) during the injection process, thereby achieving injection, penetration, and / or dilation into an apparent or potential tissue void, cavity, or blood vessel. Additionally, as described herein, the medical device assemblies described herein can achieve implantation of catheters and other medical devices via a medical puncture device, for example, via the catheter guidance structure and needle cavity described herein.

[0093] In some embodiments, before the hollow puncture needle penetrates an obvious or potential tissue void, cavity, or blood vessel, the external pressure at the needle distal opening is higher than the fluid pressure within the flowable composition lumen, so that fluid cannot flow out of the needle distal opening. Therefore, by observing whether the floating seal moves forward due to its elastic engagement with an actuating member (e.g., a presser element), it is possible to determine whether the hollow puncture needle has penetrated an obvious or potential tissue void, cavity, or blood vessel, thereby reminding the practitioner of the current puncture depth to ensure accurate puncture. Because the injection is controlled by changes in the fluid pressure within the flowable composition lumen, the practitioner does not need to manually apply thrust or force during the injection process, thereby preventing fluctuations in flow rate and achieving stable injection.

[0094] III. Methods for Medical Penetration In some embodiments, methods are described herein for performing a medical puncture, for example, in the eye or other organ or tissue.

[0095] As shown in FIGS. 1 to 11B, in some embodiments, the present invention provides a medical puncturing or penetrating device including a syringe barrel 1, an actuation unit (e.g., an elastic movement unit for pushing the needle), a hollow puncture needle 6, and a flowable composition lumen 7.

[0096] In some embodiments, syringe barrel 1 includes a distal closed end and a proximal open end. In some embodiments, syringe barrel 1 may be designed to have two axially open ends, and sealing of the distal end may be achieved by attaching a distal seal 8 to the distal opening of syringe barrel 1. In some embodiments, distal seal 8 may be made of a material, such as rubber, that can be punctured by hollow puncture needle 6.

[0097] In some embodiments, the actuation unit (e.g., elastic displacement unit) includes an actuation member (e.g., a presser element) 2 and a floating seal 3, where the floating seal 3 is configured to sealingly engage an inner wall of the syringe barrel and move axially, e.g., toward the distal or proximal end of the syringe barrel. In some embodiments, the actuation member (e.g., the presser element) 2, or a portion thereof, is located outside the proximal opening of the syringe barrel so that a practitioner can manually press the actuation member (e.g., the presser element) or a portion thereof. In some embodiments, the floating seal 3 elastically engages the actuation member 2, and when pressure is applied to the actuation member 2, the floating seal 3 is movable forward or backward relative to the actuation member (e.g., the presser element). In some embodiments, the floating seal 3 is configured to move toward the distal end of the syringe barrel. In some embodiments, the floating seal 3 is configured to move toward the proximal end of the syringe barrel. In some embodiments, the position of the actuating member (e.g., a pressure element) relative to the syringe barrel remains stationary, and the floating seal 3 is configured to resiliently move forward (e.g., distally) due to resilient engagement with the actuating member (e.g., a pressure element).

[0098] In some embodiments, the hollow puncture needle 6 is fixedly connected to the actuation member 2. When no pressure is applied to the actuation member 2, the hollow puncture needle 6 is held proximal to the floating seal 3 and the two do not contact each other. In some embodiments, the hollow puncture needle 6 itself includes a needle distal opening 6 a and a needle body opening 6 b. In some embodiments, the needle distal opening 6 a and the needle body opening 6 b are connected via a needle cavity or needle body passage of the hollow puncture needle 6.

[0099] In some embodiments, flowable composition lumen 7 is used to store pharmaceuticals and other flowable compositions, such as liquids and gels. In some embodiments, flowable composition lumen 7 is surrounded by the closed distal end of the syringe barrel, the lumen wall of the syringe barrel, and floating seal 3; i.e., flowable composition lumen 7 occupies a distal portion of the lumen of the syringe barrel. In some embodiments, floating seal 3 is axially movable such that flowable composition lumen 7 is configured to have a variable volume, and axial movement of floating seal 3 can change the fluid pressure within flowable composition lumen 7.

[0100] In some embodiments, using the medical puncture device 2 disclosed herein involves applying pressure to the actuation member 2 to advance the hollow puncture needle 6 distally through the floating seal 3 (e.g., by puncturing the floating seal or forcing a conventional hole or slit therethrough) and the closed distal end of the syringe barrel (e.g., by puncturing the closed distal end or forcing a conventional hole or slit therethrough). The conventional hole or slit may extend through the floating seal, e.g., from the proximal surface of the floating seal to the distal surface of the floating seal, thereby providing a through-hole in the floating seal. The conventional hole or slit need not extend entirely through the floating seal, and advancing the needle distal end through the floating seal may include advancing through a conventional hole or slit and puncturing a portion of the floating seal, in any suitable combination. For example, the needle distal end can be advanced from the proximal surface first, through a conventional hole or slit, and then puncture the floating seal before emerging from the distal surface of the floating seal, or vice versa. In some embodiments, the hollow puncture needle 6 is inserted into an apparent or potential tissue void, cavity, or vessel, thereby disposing the needle distal opening 6a within the apparent or potential tissue void, cavity, or vessel. In some embodiments, the needle body opening 6b is located within the flowable composition lumen 7, and the floating seal 3 resiliently engages the actuation member 2. In some embodiments, the fluid pressure within the flowable composition lumen 7 is greater than the pressure within the apparent or potential tissue void, cavity, or vessel.

[0101] At this time, the flowable composition within the flowable composition lumen 7 can pass through the needle body opening 6b and the needle distal opening 6a into an apparent or potential tissue void, cavity, or blood vessel. In some embodiments, a user can simply maintain pressure on the actuating member 2 during the injection process, for example, without further increasing the pressure. The elastic engagement between the floating seal 3 and the actuating member 2 allows the flowable composition (e.g., a solution, suspension, or gel) within the flowable composition lumen 7 to enter the needle body opening 6b and pass through the needle body passageway to achieve injection, penetration, and / or expansion into an apparent or potential tissue void, cavity, or blood vessel.

[0102] In some embodiments, before the hollow puncture needle 6 is pierced into an apparent or potential tissue void, cavity, or blood vessel, the external pressure at the needle distal opening 6a is higher than the fluid pressure within the flowable composition lumen 7, for example, because the needle distal opening is located in tissue that is denser, harder, and / or less deformable than an apparent or potential tissue void, cavity, or blood vessel. Therefore, the flowable composition within the flowable composition lumen remains at the needle distal opening 6a and cannot enter the surrounding tissue. Taking the puncture process of the SCS of the eye as an example, if the hollow puncture needle 6 is pierced into the sclera 13 but not into the SCS 14, the flowable composition will not flow out of the needle distal opening 6a, regardless of whether the needle body opening 6b is in fluid communication with the flowable composition lumen 7. This is because the sclera 13 is relatively dense, and a relatively high external pressure is applied to the needle distal opening 6a when the needle distal opening 6a is within the sclera 13. The external pressure is greater than the fluid pressure within the flowable composition lumen 7, and dense tissue such as the sclera essentially acts as a plug to prevent the outflow of the flowable composition.

[0103] In some embodiments, by observing whether the floating seal 3 moves forward due to the elastic engagement when the actuating member 2 is stationary under pressure, the practitioner can determine whether the hollow puncture needle 6 has penetrated an apparent or potential tissue void, cavity, or blood vessel, thereby informing the practitioner of the current needle depth and / or the location of the needle distal opening and ensuring accurate needle placement. In some embodiments, the injection can be controlled by varying the fluid pressure within the flowable composition lumen 7, eliminating the need for manually applying force transmitted through a relatively hard medium (e.g., a solid or liquid) to advance the needle tip and accurately position it within an apparent or potential tissue void, cavity, or blood vessel. Rather, the elastic engagement between the actuating member 2 and the floating seal 3 can buffer sudden forces applied to the actuating member 2, allowing for more controllable and stable movement of the floating seal. In some embodiments, the use of the device disclosed herein can prevent or reduce fluctuations in flow rate, achieving stable injection.

[0104] In some embodiments, when the hollow puncture needle 6 is inserted into the distal closed end of the syringe barrel, the medical puncture device can be in at least three states: a pre-puncture state, a superficial tissue puncture state, and a fluid communication state.

[0105] In some embodiments, in the pre-puncture state, the range of the length of the hollow puncture needle 6 extending from the closed distal end of the syringe barrel is a pre-puncture length range, in which the hollow puncture needle 6 has not yet begun to puncture an organ or tissue.

[0106] In some embodiments, a system or device of the present invention includes a flowable composition lumen prefilled with a flowable composition. In some embodiments, prior to use of the system or device, a needle is passed through the floating seal. In some embodiments, prior to use of the system or device, a needle is passed through the floating seal and the distal end of the syringe barrel, e.g., a distal seal sealing the distal end of the syringe barrel.

[0107] In some embodiments, the flowable composition has a relatively high viscosity, e.g., a viscosity greater than that of a water-like consistency, such as a gel or paste-like material. The elastic sleeve or sheath 4 shown in the present figures is optional, especially if the viscosity of the flowable composition is sufficient to prevent discharge from the needle body opening and / or the needle distal opening when the opening is located within the flowable composition lumen. For example, as shown in FIG. 3A, the needle may be passed through the floating seal such that the needle body opening 6b is proximal to the floating seal and the needle distal opening 6a is within the flowable composition lumen. Discharge of the flowable composition from the needle body opening can be prevented by the viscosity of the composition, and the elastic sheath is optional. Alternatively, as shown in FIG. 3B, the needle body opening 6b can be within the flowable composition lumen and the needle distal opening 6a can be outside the flowable composition lumen. Discharge of the flowable composition from the needle distal opening can be prevented by the viscosity of the composition until the needle distal opening reaches a target tissue, such as an apparent or potential tissue void, cavity, or blood vessel.

[0108] In some embodiments, for example, before or during use of the system or device, the needle distal opening 6a is outside the flowable composition lumen, while the needle body opening 6b may be proximal to the floating seal (see, e.g., FIG. 3C, 6b1) or within the floating seal (see, e.g., FIG. 3C, 6b2). Ejection of the flowable composition from the needle distal opening may be prevented by the viscosity of the composition until the needle distal opening reaches the target tissue, such as an apparent or potential tissue void, cavity, or blood vessel.

[0109] In some embodiments, for example, before or during use of the system or device, the needle distal opening 6a may be within a distal seal of the syringe barrel's distal closed end (e.g., the needle distal opening may be blocked by the distal seal), and the needle body opening 6b may be proximal to the floating seal (e.g., see FIG. 3D, 6b1), within the floating seal (e.g., see FIG. 3D, 6b2), or within the flowable composition lumen (e.g., see FIG. 3D, 6b3). The flowable composition can be prevented from exiting the needle distal opening and the needle body opening.

[0110] In some embodiments, for example, before or during use of the system or device, the needle distal opening 6a may be within the flowable composition lumen, and the needle body opening 6b may be within a floating seal (e.g., see FIG. 3E, 6b1) or within the flowable composition lumen (e.g., see FIG. 3E, 6b2), preventing the flowable composition from exiting the needle body opening.

[0111] In some embodiments, for example, before or during use of the system or device, the needle distal opening 6a may be within the floating seal and the needle body opening 6b may be proximal to the floating seal (see, e.g., FIG. 3F, 6b), preventing the flowable composition from exiting the needle body opening.

[0112] In some embodiments, in the superficial tissue puncture state, the length range of the hollow puncture needle 6 extending from the closed distal end of the syringe barrel is the superficial tissue puncture length range. In this range, the distal end of the hollow puncture needle 6 has penetrated the superficial tissue (e.g., pierced the sclera 13) but has not penetrated any obvious or potential tissue voids, cavities, or blood vessels (e.g., has not pierced the SCS 14). In some embodiments, because the superficial tissue is relatively dense, the external pressure at the needle distal opening 6a is higher than the fluid pressure within the flowable composition lumen 7, and therefore the flowable composition does not enter or exit the needle body opening 6b or the needle distal opening 6a, regardless of whether the needle body opening 6b is connected to the flowable composition lumen 7.

[0113] In some embodiments, in the fluid communication state, the length range of the hollow puncture needle 6 extending from the closed distal end of the syringe barrel is the fluid communication length range. In this range, the distal end of the hollow puncture needle 6 is inserted into an apparent or potential tissue void, cavity, or blood vessel. In some embodiments, the device may be designed such that, in the fluid communication state, the fluid pressure within the flowable composition lumen 7 is higher than the pressure within the apparent or potential tissue void, cavity, or blood vessel. In some embodiments, in the fluid communication state, the needle body opening 6b is positioned within the flowable composition lumen 7, and due to the pressure difference between the interior (e.g., within the apparent or potential tissue void, cavity, or blood vessel) and the exterior (e.g., flowable composition lumen 7), the flowable composition within lumen 7 may flow through the needle body opening 6b, the needle body passage, and then through the needle distal opening 6a into the apparent or potential tissue void, cavity, or blood vessel.

[0114] In some embodiments, the floating seal 3 moves distally due to resilient engagement with the actuation member 2 (e.g., due to pressure within the flowable composition lumen being greater than the backpressure at the needle distal opening in an apparent or potential tissue void, cavity, or vessel) until the floating seal seals the needle body opening 6b (e.g., FIGS. 4A-4B). In some embodiments, the axial dimension of the needle body opening is equal to or less than the thickness of the floating seal. In some embodiments, the needle body opening may be completely sealed or occluded by the floating seal, in which case the flowable composition no longer enters the tissue void through the needle distal opening 6a. In some embodiments, when the floating seal occludes the needle body opening, only a portion of the total volume of the flowable composition flows out of the needle distal opening 6a (see, e.g., FIG. 4A). In some embodiments, when the floating seal occludes the needle body opening, the entire volume of the flowable composition within the lumen flows out of the needle distal opening 6a (see, e.g., FIG. 4B).

[0115] In some embodiments, the needle body opening may be within the distal seal or within the examinee's tissue, and the flowable composition will stop the existing needle distal opening 6a (see, e.g., FIG. 4C). In some embodiments, the distance between the needle distal opening 6a and the needle body opening 6b may be held constant. In some embodiments, the distance between the needle distal opening 6a and the needle body opening 6b may be variable. For example, a needle having an appropriate distance between the needle distal opening 6a and the needle body opening 6b may be selected based on the known or estimated depth of the tissue to be accessed. In some embodiments, a stopper 1a may be positioned within the syringe lumen and used to limit the forward movement of the floating seal 3 to enable precise injections, such as injections of a predetermined volume.

[0116] In some embodiments, when the floating seal 3 contacts the stopper 1a, further distal movement of the floating seal is restricted, stabilizing the floating seal 3 for subsequent operation, as shown, for example, in FIGS. 6-11B.

[0117] In some embodiments, a system or device disclosed herein includes two or more floating seals. For example, as shown in FIG. 5A, a first lumen is formed between floating seal 3b and the distal seal of the syringe barrel, and a second lumen is formed between floating seal 3a and floating seal 3b. In some embodiments, the first lumen and the second lumen include the same flowable material. In some embodiments, the first lumen and the second lumen include different flowable compositions. In some embodiments, the first lumen and the second lumen include the same pharmaceutical agent (e.g., active pharmaceutical ingredient) in the same or different flowable carrier or excipient. In some embodiments, the first lumen and the second lumen include different pharmaceutical agents (e.g., active pharmaceutical ingredients) in the same or different flowable carrier or excipient. In some embodiments, the first lumen includes the pharmaceutical agent and the second lumen includes a pharmaceutically acceptable carrier or excipient, such as saline, or vice versa.

[0118] In some embodiments, the flowable compositions in the first lumen and the second lumen may be delivered sequentially into an apparent or potential tissue void, cavity, or vessel. In some embodiments, the flowable compositions in the first lumen and the second lumen may be mixed into an apparent or potential tissue void, cavity, or vessel. In some embodiments, the flowable composition in the first lumen may enter an apparent or potential tissue void, cavity, or vessel to access and / or expand the tissue void, cavity, or vessel. The flowable composition including the pharmaceutical agent in the second lumen may then enter the apparent or potential tissue void, cavity, or vessel. For example, as shown in FIG. 5A , when the needle distal opening 6a is in an apparent or potential tissue void, cavity, or vessel and the needle body opening 6b is in the first lumen (between the floating seal 3b and the distal seal of the syringe barrel), the flowable composition in the first lumen is delivered to the tissue. In Figure 5B, when floating seal 3b moves distally and needle body opening 6b contacts the second lumen (between floating seal 3a and floating seal 3b), needle distal opening 6a may remain stationary within an apparent or potential tissue void, cavity, or vessel. In this manner, the flowable composition within the second lumen begins delivery to tissue until a volume is delivered and / or floating seal 3a (or floating seals 3a and 3b together) occludes needle body opening 6b, as shown in Figure 5C. In some embodiments, a set (e.g., predetermined) volume of flowable composition within the first lumen and / or a set (e.g., predetermined) volume of flowable composition within the second lumen may be delivered to an apparent or potential tissue void, cavity, or vessel. In some embodiments, the dimension of the needle body opening 6b along the needle axis direction is greater than the thickness of the floating seal 3b so that the first flowable composition (between the floating seal 3b and the distal end seal of the syringe barrel) and the second flowable composition (between the floating seal 3b and the floating seal 3a) can be delivered sequentially and continuously through the needle distal opening into an apparent or potential tissue void, cavity, or vessel.In some embodiments, the dimension of needle body opening 6b along the needle axis direction is less than or equal to the sum of the thicknesses of floating seal 3a and floating seal 3b. In some embodiments, the dimension of needle body opening 6b along the needle axis direction is greater than the thickness of floating seal 3b but less than the sum of the thicknesses of floating seal 3a and floating seal 3b. In some embodiments, a system or device disclosed herein includes one or more additional floating seals (e.g., third floating seal 3c) proximal to third flowable seal 3a, distal to third flowable seal 3b, and / or between floating seal 3a and floating seal 3b so that the third flowable composition is delivered before the first flowable composition, after the second flowable composition, or between the first and second flowable compositions.

[0119] In some embodiments, the systems or devices disclosed herein include two or more needle body openings. In some embodiments, the systems or devices disclosed herein include two or more needle body openings and two or more floating seals. For example, as shown in FIG. 5D, when the needle distal opening 6a is in an apparent or potential tissue void, cavity, or vessel, the needle body opening 6b1 is in a first lumen (between floating seal 3b and the distal seal of the syringe barrel), and the needle body opening 6b2 is blocked by floating seal 3b, the flowable composition in the first lumen is delivered to the tissue. In FIG. 5E, when floating seal 3b moves distally to block needle body opening 6b1, the needle distal opening 6a remains stationary in the apparent or potential tissue void, cavity, or vessel, allowing the needle body opening 6b2 to contact the second lumen (between floating seal 3a and floating seal 3b). In this manner, as shown in FIG. 5F , the flowable composition in the second lumen begins to be delivered to tissue until a predetermined volume is delivered and / or floating seal 3a (or floating seals 3a and 3b together) occludes needle body opening 6b2 (and / or needle body opening 6b1). In some embodiments, a set (e.g., predetermined) volume of the flowable composition in the first lumen and / or a set (e.g., predetermined) volume of the flowable composition in the second lumen may be delivered to an apparent or potential tissue void, cavity, or vessel. In some embodiments, the distance along the needle axis between needle body opening 6b1 and needle body opening 6b2 is greater than the thickness of floating seal 3b such that the first flowable composition (between floating seal 3b and the distal seal of the syringe barrel) and the second flowable composition (between floating seal 3b and floating seal 3a) can be sequentially delivered through the needle distal opening to an apparent or potential tissue void, cavity, or vessel. In some embodiments, the distance along the needle axial direction between the needle body opening 6b1 and the needle body opening 6b2 is equal to or less than the sum of the thicknesses of the floating seal 3a and the floating seal 3b.In some embodiments, the distance along the needle axial direction between needle body opening 6b1 and needle body opening 6b2 is greater than the thickness of floating seal 3b and less than the combined thickness of floating seal 3a and floating seal 3b. In some embodiments, a system or device disclosed herein includes one or more additional needle body openings (e.g., third needle body opening 6b3) proximal to needle body opening 6b2, distal to needle body opening 6b1, and / or between needle body openings 6b1 and 6b2, such that a third flowable composition is delivered before the first flowable composition, after the second flowable composition, or between the first and second flowable compositions.

[0120] Described below are several embodiments for controlling the termination of an injection process using the medical lancing devices disclosed herein.

[0121] In some embodiments, when the medical puncture device is in fluid communication, the floating seal 3 advances until it resiliently engages the actuation member 2 and seals the needle body opening 6b. Once the needle body opening 6b is sealed, the injection process is terminated. In some embodiments, the axial position of the needle body opening 6b within the flowable composition lumen 7 limits the maximum injection volume of the medical puncture device. In some embodiments, when the needle body opening 6b is blocked or sealed by the floating seal 3, the floating seal 3 is not in contact with the wall of the distal closed end of the syringe barrel. In some embodiments, the flowable composition lumen 7 is not completely empty, and the flowable composition is still present between the floating seal 3 and the wall of the distal closed end of the syringe barrel.

[0122] In some embodiments, the floating seal 3 may be designed to seal the needle body opening 6b when it contacts the syringe barrel's distal closed end when it is necessary to empty the flowable composition lumen 7. In some embodiments, the needle body opening 6b is located at the distal end of the flowable composition lumen 7. In some embodiments, the floating seal 3 contacts the wall of the syringe barrel's distal closed end, and the needle body opening 6b is blocked or sealed by the floating seal 3 and / or the wall of the syringe barrel's distal closed end. In some embodiments, the flowable composition lumen 7 is emptied, with little or no flowable composition present between the floating seal 3 and the wall of the syringe barrel's distal closed end.

[0123] In some embodiments, as the flowable composition within flowable composition lumen 7 gradually enters a visible or hidden tissue void, cavity, or vessel, a condition may exist where the fluid pressure within flowable composition lumen 7 balances with the pressure within the visible or hidden tissue void, cavity, or vessel. At this point, floating seal 3 will not move due to the balance of forces. To continue the injection and / or empty flowable composition lumen 7, additional force must be applied to floating seal 3 to move it forward toward the closed distal end of the syringe barrel.

[0124] For example, as shown in FIGS. 2A-2E, the body wall of the syringe barrel 1 may be provided with one or more axially extending sliding grooves (not shown). A slider that fits the sliding groove may be disposed on the actuating member 2 (e.g., the slider may include a portion of the actuating member 2 that extends outside the syringe barrel 1), thereby increasing the upper limit of the travel distance or stroke of the actuating member 2 because movement is not restricted by the proximal end of the actuating member 2. If the floating seal 3 cannot move any further due to a force balance (e.g., pressure between the flowable composition lumen 7 and an apparent or potential tissue void, cavity, or vessel), greater pressure can be applied to the slider of the actuating member 2 to advance the actuating member 2 toward the distal end, thereby increasing the elasticity between the floating seal 3 and the actuating member 2, disrupting the force balance and advancing the floating seal 3 toward the distal end of the syringe barrel. This allows more flowable composition to be expelled from the flowable composition lumen 7, and in some embodiments, emptying the flowable composition lumen 7.

[0125] In some embodiments, other drive structures may be used to move the floating seal 3 further until it contacts the wall of the closed distal end of the syringe barrel. Exemplary drive structures are described below.

[0126] In some embodiments, the medical puncture device includes an element configured to allow a practitioner to manually control the movement of the floating seal using one or both hands. In some embodiments, the manual control element can be moved using one or more fingers, for example, one finger of the same hand that grips the syringe barrel. In some embodiments, the manual control element is fixed to the floating seal 3 and extends partially outside the syringe barrel. In some embodiments, if the volume of the flowable composition injected into an apparent or potential tissue void, cavity, or blood vessel has not reached the target volume and the floating seal 3 no longer moves due to the balance of forces, the practitioner may drive the floating seal 3 further forward by moving the portion of the manual control element that extends outside the syringe barrel until the volume of the expelled flowable composition reaches the target volume. In some embodiments, the use of the manual control element facilitates emptying the flowable composition lumen 7. These embodiments are not limited to cases where the flowable composition lumen 7 needs to be emptied.

[0127] In some embodiments, the medical puncture device can precisely achieve delivery (e.g., by injection) of a defined volume of the flowable composition and / or control the delivered volume. In some embodiments, the defined volume is a preset volume prior to delivery. In some embodiments, the defined volume is one of multiple volumes selectable by the practitioner during delivery, and the delivered volume may be different from the preset volume. In some embodiments, as shown in FIGS. 1A-1E, 2A-2E, and 11A-11B, an axial stopper 1a is disposed within the syringe lumen distal to the floating seal 3 and limits forward movement of the floating seal 3. In some embodiments, when the medical puncture device is in fluid communication, the needle body opening 6b may be distal to the axial stopper 1a, and the floating seal 3 may resiliently engage with the actuation member 2 and move forward.

[0128] In some embodiments, the floating seal 3 is moved to a position limited by the axial stop 1 a. In some embodiments, while the floating seal 3 is moved to a position limited by the axial stop 1 a, the pressure within the flowable composition lumen 7 is not less than the apparent or potential pressure within the tissue void, cavity, or vessel. In some embodiments, the floating seal 3 may be moved forward to a position limited by the axial stop 1 a by an elastic restoring force between the floating seal 3 and the actuation member 2, without having to rely on an additional drive structure or force to move the floating seal 3 to a position limited by the axial stop 1 a.

[0129] In some embodiments, the pressure within the flowable composition lumen 7 equalizes with the pressure within the apparent or potential tissue void, cavity, or vessel before the floating seal 3 is moved to a position restricted by the axial stopper 1a by the elastic restoring force between the floating seal and the actuation member 2 (i.e., the floating seal 3 stops moving before reaching the axial stopper 1a due to the balance of forces). At this time, the elastic restoring force between the floating seal 3 and the actuation member 2 alone does not push the floating seal 3 forward to a position restricted by the axial stopper 1a. Therefore, in some embodiments, one or more additional drive structures or mechanisms may be used to further advance the floating seal 3. For example, the additional drive structures or mechanisms may include the manual control elements described herein (e.g., see FIGS. 2A-2E). In some embodiments, the axial stopper 1a provides a mechanism for achieving a set volume of fluid injection.

[0130] Below, several embodiments of the puncture and injection timing of the medical puncture device disclosed herein are described.

[0131] In some embodiments, when the medical puncture device is in a pre-puncture state, i.e., when the length of the hollow puncture needle 6 extending from the closed distal end of the syringe barrel is within the pre-puncture length range (or when the hollow puncture needle 6 has been inserted into the closed distal end of the syringe barrel but has not yet begun to puncture an organ or its tissue), the needle body opening 6b is held above (e.g., at the proximal end of) the flowable composition lumen 7. Such a configuration can prevent early leakage from the needle distal opening 6a and improve the reliability of the medical puncture device.

[0132] In some embodiments, a corresponding structure (or structures) may be provided on the device to prevent premature leakage before the hollow puncture needle 6 penetrates tissue and / or before the needle distal opening 6a reaches an obvious or potential tissue gap, cavity, or blood vessel. For example, an axially extending circular contact element 1b (optional) may be formed on the closed distal end of the syringe barrel. In some embodiments, the axial length of the circular contact element 1b is set to be equal to the difference between the upper and lower limits of the pre-puncture length range of the hollow puncture needle 6 (i.e., the difference in the pre-puncture length of the needle between when the hollow puncture needle 6 is inserted into the closed distal end of the syringe barrel and when it begins to puncture the organ or tissue). In this setting, premature leakage will not occur at the needle distal opening 6a as long as the distal end of the hollow puncture needle 6 is within the axial length range of the circular contact element 1b. During puncture, the circular contact element 1b may first contact the surface of the organ or tissue to stabilize the medical puncture device. Thereafter, pressure may be applied to the actuation member 2 to initiate the puncture operation.

[0133] In some embodiments, when the medical puncture device is in a superficial tissue puncture state, i.e., when the length of the hollow puncture needle 6 extending from the syringe barrel distal closed end is within the superficial tissue puncture length range (or when the distal end of the hollow puncture needle 6 has penetrated the superficial tissue but has not yet entered an apparent or potential tissue void, cavity, or blood vessel), the needle body opening 6b is at least partially connected to the flowable composition lumen 7. In some embodiments, fluid communication is established between the flowable composition lumen 7, the needle distal opening 6a, and the needle body opening 6b before the distal end of the hollow puncture needle 6 penetrates an apparent or potential tissue void, cavity, or blood vessel. In some embodiments, the flowable composition in the lumen 7 can enter the needle body passage of the hollow puncture needle 6 (through the needle body opening 6b) early, removing at least a portion of the air that may be present in the needle body passage, thereby reducing the amount of air that enters the apparent or potential tissue void, cavity, or blood vessel.

[0134] In some embodiments, as the distal end of hollow puncture needle 6 begins to penetrate superficial tissue, needle body opening 6b begins to connect to flowable composition lumen 7. In some embodiments, when the distal end of hollow puncture needle 6 penetrates an apparent or potential tissue void, cavity, or vessel, the needle body passage of hollow puncture needle 6 is completely filled with flowable composition, thereby eliminating or reducing the possibility of air entering the apparent or potential tissue void, cavity, or vessel.

[0135] In some embodiments, when the medical puncture device is in a fluid communication state, i.e., when the length of the hollow puncture needle 6 extending from the closed distal end of the syringe barrel is within the fluid communication length range (or when the distal end of the hollow puncture needle 6 is inserted into an apparent or potential tissue void, cavity, or blood vessel), the needle body opening 6b is positioned within the flowable composition lumen 7, and a maximum flow rate is achieved at the needle body opening 6b, thereby increasing the injection speed.

[0136] The embodiments described herein may be implemented singly or in any suitable combination.

[0137] In some embodiments, the devices disclosed herein can prevent backflow and / or back-out of fluid through the needle body opening 6b.

[0138] In some embodiments, if the needle body opening 6b is still at the proximal end of the floating seal 3 while the needle distal opening 6b is connected to the flowable composition lumen 7, there is a risk of fluid backflow and / or backflow from the needle body opening 6a. In some embodiments, if the needle body opening 6b is still at the proximal end of the floating seal 3 while the needle distal opening 6a is in an apparent or potential tissue void, cavity, or blood vessel, there is a risk of fluid backflow and / or backflow from the needle body opening 6b. In some embodiments, the elastic sheath 4 covering the outside of the hollow puncture needle 6 may be provided within the actuation unit (e.g., elastic movement unit), for example, between the needle base and the floating seal 3. In some embodiments, when the needle body opening 6b is proximal to the floating seal 3 (e.g., when the needle body opening 6b is not connected to the flowable composition lumen 7), the elastic sheath 4 can maintain the seal of the needle body opening 6b, effectively avoid backflow and / or back-spill of the flowable composition, prevent contamination of the proximal region of the floating seal 3, reduce fluid loss, and improve product reliability.

[0139] In some embodiments, the elastic sheath 4 is not used to seal the needle body opening 6b, but simply functions as an elastic engagement between the floating seal 3 and the actuating member 2. In some embodiments, moving the actuating member 2 forward compresses the elastic sheath 4 between the floating seal 3 and the actuating member 2, thereby creating an elastic restoring force between the floating seal 3 and the actuating member 2 and driving the floating seal 3 forward. In some embodiments, the elastic engagement between the floating seal 3 and the actuating member 2 can include or be a spring 5 assembled at each axial end of the floating seal 3 and the actuating member 2. The attachment at one or both ends of the spring can be direct or indirect. The attachment at one or both ends of the spring can be releasable or non-releasable. The spring, floating seal, and actuating member (e.g., a presser element) can be manufactured separately and then assembled in any suitable order. Alternatively, any two or more of the spring, floating seal, and actuating member (e.g., a presser element) can be integral, e.g., one piece. The spring 5 and the elastic sheath 4 may be implemented individually or in combination.

[0140] In some embodiments, the elastic engagement between the floating seal 3 and the actuating member 2 may be achieved by other methods in addition to providing one or more elastically engaging parts. For example, the floating seal 3 and the actuating member 2 may be arranged as a one-piece integrated actuating unit (e.g., an elastic movement unit).

[0141] In some embodiments, devices and methods are provided for implanting into apparent or potential tissue voids, cavities, and blood vessels using the medical puncture devices disclosed herein. For ease of understanding, a catheter is used as an example of an implanted medical device. In some embodiments, the methods disclosed herein include guiding a catheter 11 into a needle body passage of a hollow puncture needle 6 using a catheter guidance structure. In some embodiments, a catheter guidance structure is provided within the medical puncture devices disclosed herein.

[0142] In some embodiments, as shown in Figures 6-8, the catheter guidance structure comprises an angled guide groove 3a disposed within or engaged with the floating seal 3 and extending at an angle toward the hollow puncture needle 6. In some embodiments, the flowable composition can enter and expand an apparent or potential tissue void, cavity, or vessel when the flowable composition lumen 7, the needle body opening 6b, and the needle distal opening 6a are connected. In some embodiments, the catheter 11 can be implanted through the angled guide groove 3a, the needle body opening 6b, the hollow puncture needle needle body passage 6, and the needle distal opening 6a into the expanded apparent or potential tissue void, cavity, or vessel.

[0143] The inclined guide groove 3a may be a groove that penetrates the floating seal 3 in the proximal / distal direction, or may be a non-penetrating groove formed on the proximal end surface of the floating seal 3.

[0144] In some embodiments, the inclined guide groove 3a is a through groove. In some embodiments, the catheter guidance structure further includes a valve 9 disposed within or engaged with the inclined guide groove 3a, and the valve may be a check valve configured to be openable and closable. In some embodiments, the valve includes multiple leaflets configured to open and close the valve. In some embodiments, in the absence of an external force, the check valve 9 is closed, preventing the flowable composition in the flowable composition lumen 7 from leaking through the valve. In some embodiments, in the presence of a valve-opening force, the multiple leaflets of the valve can be forced open so that the catheter 11 passes through the open valve and into the needle body opening 6b. In some embodiments, the catheter guidance structure further includes a guide groove plug configured to be removably inserted into the inclined guide groove 3a, and the guide groove plug may be withdrawn when the catheter 11 needs to be implanted.

[0145] In some embodiments, the beveled guide groove 3a is a non-through groove. In some embodiments, the beveled guide groove is punctured directly by the implanted catheter 11. In some embodiments, the beveled guide groove is punctured by a piercing component other than a catheter, and the catheter 11 can enter the needle body opening 6b through the puncture opening.

[0146] In some embodiments, in order to match the guiding direction of the inclined guide groove 3a, the needle body opening 6b may be provided as an inclined opening that opens at an angle backward so that the needle body opening 6b aligns with the inclined guide groove 3a, thereby accurately guiding the catheter 11 through the inclined guide groove and into the needle body opening.

[0147] 9 and 10, the catheter guidance structure includes an inclined guide needle hole 6c formed or disposed in the body wall of the hollow puncture needle 6 and opening at an angle toward the rear. In some embodiments, for example, when the medical puncture device is in fluid communication, the inclined guide needle hole 6c is maintained proximal to the floating seal 3. In some embodiments, the catheter 11 may penetrate through the inclined guide needle hole 6c into the needle body passage of the hollow puncture needle 6. In some embodiments, the catheter 11 may be implanted through the needle distal opening 6a into an apparent or potential tissue void, cavity, or blood vessel (or an apparent or potential tissue void, cavity, or blood vessel dilated with the flowable composition).

[0148] In some embodiments, the catheter guidance structure may further include a valve 9 disposed in or engaged with the angled guide needle bore 6c, and the valve may be a check valve configured to be openable and closable. In some embodiments, the valve includes multiple leaflets configured to open and close the valve. In some embodiments, in the absence of an external force, the check valve 9 is closed, preventing the flowable composition in the flowable composition lumen 7 from leaking through the valve. In some embodiments, in the presence of a valve-opening force, the multiple leaflets of the valve may be forced open so that the catheter 11 penetrates through the valve and the angled guide needle bore 6c into the needle body passage (which may be connected to or separated from the needle body passage connecting the needle body opening 6b and the needle distal opening 6a). In some embodiments, the catheter guidance structure may further include a needle bore plug 10 configured to be removably inserted into the angled guide needle bore 6c, and the needle bore plug 10 may be withdrawn to initiate implantation of the catheter 11. In some embodiments, the guide needle bore 6c is connected to the needle distal opening 6a. The needle body passage connecting the needle distal opening 6a and the needle body opening 6b may be the same as or separate from the needle body passage connecting the needle distal opening 6a and the guide lumen 6c. In some embodiments, the guide lumen 6c is connected to a needle distal opening other than the needle distal opening 6a connected to the needle body opening 6b. The needle body passage connecting the needle body opening 6b to the needle distal end may be completely separate from the needle body passage connecting the guide lumen 6c to the needle distal end. The needle body passage connecting the needle body opening 6b to the needle distal end may at least partially overlap or be in fluid communication with the needle body passage connecting the guide lumen 6c to the needle distal end.

[0149] In some embodiments, for example, as shown in FIGS. 11A-11B, the catheter guidance structure includes a central guide groove 2c formed or disposed on the proximal surface of the actuating member 2. In some embodiments, the central guide groove 2c may include a hole or may form a hole in the center of the proximal surface of the actuating member 2. In some embodiments, the central guide groove 2c may be punctured to provide a hole. In some embodiments, the needle proximal opening is disposed on the hollow puncture needle 6 and is aligned with the central guide groove 2c along the axis. In some embodiments, when it is necessary to implant the catheter 11, the central guide groove 2c can be punctured, and the catheter 11 can pass through the puncture opening of the central guide groove 2c and the needle proximal opening of the hollow puncture needle 6 into the needle body passage (which may be connected to or separate from the needle body passage connecting the needle body opening 6b and the needle distal opening 6a). In some embodiments, the catheter 11 may be implanted through a needle distal opening, such as needle distal opening 6a or a different needle distal opening, into an apparent or potential tissue void, cavity or vessel (or an apparent or potential tissue void, cavity or vessel dilated with the flowable composition).

[0150] In some embodiments, disclosed herein are kits that include components configured to be assembled to form the medical puncture devices disclosed herein.

[0151] In some embodiments, a kit for assembling a medical lancing device includes a lancing control module and a flowable composition storage module (e.g., a fluid storage module). In some embodiments, the lancing control module and the flowable composition storage module are manufactured and / or provided independently. In some embodiments, the lancing control module includes a first syringe unit, an actuation unit (e.g., an elastic movement unit), and a hollow puncture needle 6 disposed in the syringe barrel of the first syringe unit. Based on the embodiments disclosed herein, it can be understood that the lancing control module may further include other parts or components, such as an elastic sheath 4 and a spring 5. In some embodiments, the fluid storage module includes a second syringe unit, a flowable composition lumen 7 formed in the syringe barrel of the second syringe unit, and a module packaging component removably disposed at the proximal end of the second syringe unit. In some embodiments, a detachable connection structure is formed between the first syringe unit and the second syringe unit. In some embodiments, the first syringe unit and the second syringe unit form a syringe barrel 1 after being connected to each other. Based on the embodiments disclosed herein, it can be seen that the fluid storage module may further include other parts, such as a distal seal 8 .

[0152] In some embodiments, the puncture control module and the fluid storage module can be manufactured, assembled, and / or packaged separately and then assembled with each other and optionally with other modules, components, and / or parts into the medical puncture device disclosed herein. In some embodiments, the module packaging component is used to seal the proximal end of the flowable composition lumen 7. In some embodiments, the module packaging component may be removed when assembling the puncture control module and the fluid storage module.

[0153] In some embodiments, provided herein are medical device assemblies and systems including the same. As shown in FIGS. 7 and 11A-11B, in some embodiments, the medical device assembly includes a catheter 11 and a medical puncture device including a catheter guidance structure disclosed herein. In some embodiments, the catheter 11 may be implanted into an obvious or hidden tissue void, cavity, or blood vessel via the medical puncture device. The medical device assemblies described herein may have all the technical effects provided by the medical puncture device.

[0154] In some embodiments, the medical device assembly includes a hollow auxiliary guide needle 12 that is compatible with and used in conjunction with a catheter guiding structure. In some embodiments, the needle body passage of the auxiliary guide needle 12 has a diameter large enough to accommodate and allow the catheter 11 to penetrate. In some embodiments, the auxiliary guide needle 12 is connected to the catheter guiding structure such that, during the operation of implanting the catheter 11, the catheter 11 passes sequentially through the needle body passage of the auxiliary guide needle 12, the catheter guiding structure, the needle body passage of the hollow puncture needle 6, and then through the needle distal opening 6a into an apparent or potential tissue void, cavity, or blood vessel. In some embodiments, prior to implanting the catheter, a medical puncture device disclosed herein is used to dilate the apparent or potential tissue void, cavity, or blood vessel with a flowable composition. In some embodiments, the catheter is implanted when the medical puncture device disclosed herein is used to dilate the apparent or potential tissue void, cavity, or blood vessel with a flowable composition. In some embodiments, a catheter is implanted before using the medical puncture device disclosed herein to dilate an apparent or potential tissue void, cavity, or vessel with a flowable composition.

[0155] In some embodiments, as shown in FIG. 7 , the catheter guide structure includes a through-hole inclined guide groove 3a and an openable / closable check valve 9 embedded in the inclined guide groove 3a. In some embodiments, the needle body opening 6b is provided as an inclined opening that opens at an angle backward. In some embodiments, when the catheter 11 is implanted, the auxiliary guide needle 12 is used to open the check valve 9, allowing the auxiliary guide needle to be positioned within the inclined guide groove 3a. In some embodiments, the distal end of the auxiliary guide needle 12 is advanced into the needle body opening 6b, and the catheter 11 sequentially passes through the needle body passage of the auxiliary guide needle 12, the needle body passage of the hollow puncture needle 6, and the needle distal opening 6a, and may then be implanted into an obvious or potential tissue void, cavity, or blood vessel.

[0156] 11A-11B, the catheter guidance structure includes a central guide groove 2c. In some embodiments, a needle proximal opening is formed in the hollow puncture needle 6 and is aligned with the central guide groove 2c along its axis. In some embodiments, when implanting the catheter 11, the central guide groove 2c can be pierced by the auxiliary guide needle 12 so that the auxiliary guide needle 12 is axially aligned with the proximal opening of the hollow puncture needle 6. In some embodiments, the catheter 11 is advanced into the needle body passage of the hollow puncture needle 6, sequentially through the needle body passage of the auxiliary guide needle 12 and the proximal opening of the hollow puncture needle 6, and then through a needle distal opening, such as the needle distal opening 6a, and implanted into an apparent or potential tissue void, cavity, or vessel.

[0157] In some embodiments, provided herein is a syringe barrel including a proximal end and a distal end, a floating seal within the syringe barrel, a needle hub proximal to the floating seal, a piston rod between the floating seal and the needle hub, the piston rod and the needle hub resiliently engaging each other, and a needle within the piston rod including a needle proximal end and a needle distal end that engages the needle hub, the needle including: (i) a needle distal opening; (ii) a needle body opening between the needle proximal end and the needle distal end, the needle body opening proximal to the needle distal opening; and (iii) a needle body passage connecting the needle distal opening and the needle body opening, the needle hub configured to advance the needle distally through the piston rod toward and / or through the floating seal.

[0158] In some embodiments, the floating seal may be fixedly assembled to the distal end of the piston rod and may form a sliding, sealing engagement with the inner surface of the syringe barrel. In any embodiment herein, the needle base may be fixedly engaged with an actuation member (e.g., a retainer element), and a spring may engage the actuation member and the piston rod, thereby providing a resilient engagement between the needle base and the piston rod.

[0159] In some embodiments, when the needle distal opening is located within tissue or within a visible or hidden tissue void, cavity, or vessel, applying a pressure greater than that of the needle body opening allows the piston rod to advance distally past the floating seal without moving the floating seal distally. In some embodiments, tissue resistance or tissue pressure does not allow the flowable composition to be injected from the needle distal opening into the tissue, and the floating seal (and the piston rod in embodiments having a floating seal) does not move distally due to the force from the spring, even though the needle can be advanced distally by the force from the pressure shaft. For example, when tissue pressure does not allow injection, the needle distal opening of the needle may be within tissue, while the needle body opening may be distal to the floating seal and in contact with the flowable composition. As the needle advances further, the floating seal may maintain its axial position until the needle distal opening reaches a visible or hidden tissue void, cavity, or vessel.

[0160] In some embodiments, when the needle distal opening is within tissue or within a visible or hidden tissue void, cavity, or vessel, the floating seal may move distally to provide a lower pressure at the needle distal opening than the needle body opening. In some embodiments, tissue resistance or tissue pressure allows the flowable composition to be injected through the needle distal opening and into the tissue, and the floating seal (and piston rod in embodiments having a floating seal) moves distally by force from the spring, without the need for the needle to advance distally. For example, when tissue pressure allows injection, the needle distal opening of the needle is within a visible or hidden tissue void, cavity, or vessel, while the needle body opening is distal to the floating seal and in contact with the flowable composition. The floating seal can move distally, allowing the flowable composition to be expelled from the needle distal opening without further distal advancement of the needle.

[0161] In some embodiments, provided herein are methods for performing medical penetration using the devices described herein. In some embodiments, a pre-assembled device is provided, as shown in FIG. 17A. In some embodiments, the syringe can be separated from the main body of the device by rotating the housing of the pre-assembled device. In some embodiments, the proximal portion of the syringe can be threadedly engaged with the distal portion of the housing. For example, the proximal portion of the syringe can include threads on its inner surface configured to engage with threads on the outer surface of the distal portion of the housing, as shown in FIG. 17B.

[0162] In some embodiments, after the syringes are separated, the proximal end of the piston rod is exposed. The handle may be assembled to the piston rod, for example, by threaded engagement with the proximal end of the piston rod, as shown in FIG. 17C. In some embodiments, an adapter enclosing an adapter needle may be assembled to the syringe. In some embodiments, the adapter includes a distal opening and a proximal opening. In some embodiments, the distal end of the syringe (e.g., with the distal seal assembled) is inserted into the proximal opening of the adapter, with the adapter needle contacting the distal seal assembled to the syringe. In some embodiments, the proximal end of the adapter needle passes through the distal seal assembled to the syringe, such that the proximal opening of the adapter needle is within the lumen of the syringe. In some embodiments, a container containing a flowable composition (e.g., a drug composition), or a portion thereof, is inserted into the distal opening of the adapter, with the adapter needle contacting the container. In some embodiments, the distal end of the adapter needle is inserted into the container so that the distal opening of the adapter needle is within the container, establishing fluid communication between the flowable composition and the lumen of the syringe. In some embodiments, the handle can be pulled to move the piston rod proximally, aspirating the flowable composition through the adapter needle into the lumen of the syringe, and the handle can be pushed to move the piston rod distally to expel unwanted gas. As shown in FIG. 17D, pulling and / or pushing the handle can position the distal end of the piston rod and the seal within the syringe to set the appropriate volume of flowable composition in the syringe, e.g., 0.1 ml or 0.05 ml. The handle can then be removed from the piston rod, and the adapter can be removed from the syringe. A syringe with a flowable composition therein can be connected to the device body, for example, by inserting the syringe needle (e.g., 6 shown in FIG. 17B) into the piston rod (e.g., 15 shown in FIG. 17D), so that the piston rod is inserted into a catheter within the housing and the proximal end of the syringe is screwed onto the distal portion of the housing, as shown in FIG. 17E.In some embodiments, the control knob may be turned to advance the retainer shaft distally, thereby advancing the syringe needle attached to the retainer shaft distally toward and / or through the seal within the syringe. As shown in FIG. 17F, the syringe needle may further advance through the seal tip and pierce the sclera of the eye. In some embodiments, because the sclera is a dense tissue, the pressure at the distal opening of the syringe needle may be greater than the pressure at the body opening of the syringe needle, which may be in fluid communication with the flowable composition within the syringe. In this case, the syringe needle may be advanced further within the sclera without changing the position of the floating seal within the syringe. In some embodiments, the position of the floating seal within the syringe is monitored as the practitioner presses the retainer shaft to advance the syringe needle. Once the distal opening of the syringe needle is outside the sclera and into the choroid / ciliary body, the pressure at the distal opening of the syringe needle decreases, and the pressure at the syringe needle body opening drives the flowable composition through the needle body passage and out the distal opening of the syringe needle, creating and expanding a suprachoroidal space containing the flowable composition. As a portion of the flowable composition in the syringe is expelled, the seal (along with the piston rod) moves more distally within the syringe. Thus, by observing the movement of the seal, the practitioner can determine whether the distal opening of the syringe needle has left the first tissue and reached a less dense second tissue, e.g., from the sclera into the choroid / ciliary body. In some embodiments, the distal advancement of the syringe needle stops when the seal moves and passes a preset volume mark or indicator line (e.g., 0.1 ml or 0.05 ml).

[0163] In some embodiments, for example as shown in Figures 17A-17F, the syringe is not pre-filled with the flowable material or composition, and the flowable material or composition is aspirated from a container into the syringe prior to delivery into the tissue or into a visible or hidden tissue void, cavity, or vessel.

[0164] In some examples, the syringe of a device disclosed herein may be pre-filled with a flowable material or composition, as shown in FIGS. 20A-20B. In some embodiments, a syringe (e.g., syringe 1 shown in FIG. 16) may be used in one or more parts. In some embodiments, a container (e.g., a syringe unit) may include a cylindrical wall sealingly engaged with a fixed seal (securable to the container at a distal end of the container and passable through a needle) and a floating seal (movable within the container and passable through a needle), as shown in FIGS. 20A-20B, and the space enclosed by the cylindrical wall, fixed seal, and floating seal may be pre-filled with a flowable material or composition. In some embodiments, the device or system may include a first syringe unit, and the container may be a second syringe unit configured to engage the distal end of the first syringe unit. The container (e.g., syringe unit) may be inserted or assembled into the device body (e.g., first syringe unit) before or after filling the container (e.g., syringe unit) with the flowable material or composition. In some embodiments, a floating seal within the container (e.g., syringe unit) may contact the distal end of the piston rod to establish engagement between the piston rod and the floating seal, with the spring transmitting force to the floating seal. A fixed seal at the distal end of the container (e.g., syringe unit) may contact a contact element at the distal end of the device, which may be the distal seal of the syringe, as shown in FIG. 20A. In some embodiments, the fixed seal of the container (e.g., syringe unit) also serves as the distal seal and / or contact element of the syringe, as shown in FIG. 20B. In some embodiments, the container (e.g., syringe unit) may be configured to be at least partially inserted into a syringe barrel, as shown in FIGS. 20A-20B. In some embodiments, the static seal sealingly engages a container (e.g., a syringe unit), which in turn engages the interior wall of the syringe barrel.In some embodiments, the static seal sealingly engages both the container (e.g., syringe unit) and the inner wall of the syringe barrel. The engagement between the container (e.g., syringe unit) and the syringe barrel, and the engagement between the static seal and the container wall, may include any suitable engagement, for example, by insertion, threaded engagement, non-threaded engagement, clip engagement, gland engagement, or any combination thereof. IV. METHODS AND DEVICES FOR EYE RENEWAL

[0165] Any of the systems and devices disclosed herein may be used to place a shunt in an eye, which placement of a shunt in an eye includes the steps of: (a) inserting a needle into the eye to form a delivery passage in the eye that terminates at a target outflow area in the eye; (b) delivering a flowable composition through the needle to form an expanded space in the target outflow area; (c) positioning an inflow end of a shunt (e.g., a microshunt) in the anterior chamber of the eye and positioning an outflow end of the shunt in the expanded space, wherein the shunt is releasably coupled to the needle; and (d) releasing the needle from the shunt, thereby placing the shunt in the eye and providing fluid communication between the anterior chamber and the target outflow area.

[0166] In some embodiments, the shunts disclosed herein may comprise any suitable material. Materials for fabricating the shunt include, but are not limited to, medical-grade stainless steel, titanium or titanium alloy, nickel-titanium alloy, TPU (thermoplastic polyurethane), e-PTFE (expanded polytetrafluoroethylene), silica gel, hydrogel, PES (polyethersulfone), SIBS (poly(styrene-block-isobutylene-block-styrene), or any combination thereof. In some embodiments, the material for the shunt is highly biocompatible, has mechanical properties that match the ocular tissue, and does not damage or cause side effects to the ocular tissue.

[0167] In some embodiments, the shunts disclosed herein may have any suitable shape. In some embodiments, the shunt is a circular tube. In some embodiments, the shunt includes a single lumen. In some embodiments, the shunt includes multiple lumens, e.g., parallel lumens, each extending from one end of the shunt to the other. In some embodiments, the cross-sectional shape of the shunt is circular, oval, square, or any other suitable shape. In some embodiments, any one or more surfaces of the shunt may be flat or curved.

[0168] In some embodiments, the shunts disclosed herein include a marker ring and / or a retaining ring around the shunt, as shown in Figures 18A-18C. In some embodiments, an annular ring surrounding the shunt, such as a retaining ring, may be configured to prevent migration of the shunt, such as migration of the shunt into the anterior chamber. The shape of the retaining ring may include, but is not limited to, a ring, a barb, a fin, or any combination thereof. The structure and dimensions of the shunt, including the marker ring and retaining ring, can be designed to conform to the anatomy of the ocular tissue for efficient drainage and intraocular pressure reduction without causing tissue damage and scarring.

[0169] In some embodiments, the length of the shunts disclosed herein is about 1.5 mm to about 12 mm, e.g., about 3 mm, about 4 mm, about 5 mm, or about 6 mm. In some embodiments, the outer diameter of the shunts disclosed herein is about 0.1 mm to about 1 mm, e.g., about 0.25 mm, about 0.3 mm, about 0.35 mm, about 0.4 mm, about 0.45 mm, or about 0.5 mm. In some embodiments, the inner diameter of the shunts disclosed herein is about 0.025 mm to about 0.25 mm, e.g., about 0.05 mm, about 0.08 mm, about 0.1 mm, about 0.12 mm, or about 0.15 mm. In some embodiments, a marker ring is positioned about 0.25 mm to about 2.5 mm from one end of the shunt, allowing for accurate positioning of the shunt, for example, in the anterior chamber. In some embodiments, the shunts disclosed herein have a length between about 4 mm and about 6 mm, an outer diameter between about 0.25 mm and about 0.5 mm, an inner diameter between about 0.05 mm and about 0.15 mm, and the marker ring is located between about 0.5 mm and about 2 mm from the tip of the shunt.

[0170] In some embodiments, the shunts disclosed herein may include a solid structure, a porous structure, a multilayer composite structure, a membrane stent structure, or any combination thereof. A solid structure (e.g., a homogeneous solid structure) is simple and effective and can establish channels for drainage of aqueous humor, as shown in FIG. 19A. In some embodiments, to avoid or reduce the risk of outlet blockage due to fibrosis and scarring, a microporous material can be used to promote biological integration of the material with the surrounding tissue, thereby reducing fibrosis and scarring after implantation. A porous structure can provide multiple radial channels, as shown in FIG. 19B, to improve drainage efficiency and reduce the risk of blockage of the axial outflow channel. In some embodiments, the pore size can be less than 20 microns to prevent excessive tissue or cell growth within the pores while allowing water to pass freely through the pores. In some embodiments, the core or inner layer of a multilayer composite structure can be designed to provide radial support and establish efficient drainage channels, as shown in FIG. 19C. The outer layer of the multilayer composite structure can be a porous or woven layer with pore sizes less than 20 microns to prevent excessive tissue or cell growth into the pores, which could cause channel blockage. In some embodiments, the inner layer of the membrane-covered support (e.g., a membrane stent as shown in FIG. 19D) can include a metal stent, and the outer layer can include a water-permeable membrane. In some embodiments, the metal stent is a hollow stent that can provide sufficient support and flexibility. In some embodiments, the water-permeable membrane only allows water molecules to pass through, thereby facilitating aqueous humor drainage and preventing tissue or cell growth from blocking the outflow channels.

[0171] In some embodiments, methods of using the devices disclosed herein to deliver the shunts disclosed herein are provided herein. In some embodiments, the shunts are preloaded into the needle of a delivery system (e.g., a suprachoroidal syringe) and implanted into the suprachoroidal space using the extraocular methods described herein. After the needle tip of the delivery system punctures the sclera and reaches the choroid / ciliary body layer, a viscoelastic agent is automatically injected to open the suprachoroidal space, and the shunt in the needle is pushed to the target location, e.g., through a metal wire. The delivery system can be withdrawn to complete the implantation of the shunt. The methods disclosed herein are useful for minimally invasive glaucoma surgery (MIGS). Additional details of the devices, systems, and methods are disclosed below.

[0172] As shown in FIG. 12 , in step 1, a method for placing a shunt in an eye is disclosed herein, which includes inserting a needle into the eye through the conjunctiva and sclera to form a delivery channel within the eye that terminates between the sclera and the choroid / ciliary body of the eye. A flowable composition, such as a viscoelastic material, is delivered through the needle to form a suprachoroidal space between the sclera and the choroid / ciliary body. In step 2 of FIG. 12 , the needle may be rotated to position the distal tip of the needle toward the anterior chamber angle. The suprachoroidal space can be expanded by the viscoelastic material, providing more space for repositioning the distal tip of the needle without damaging the choroid / ciliary body or other surrounding ocular tissues. In step 3 of FIG. 12 , the needle is moved to pierce the distal end of the needle into the anterior chamber angle so that the distal opening of the needle is exposed within the anterior chamber. In step 4 of FIG. 12 , the shunt may be inserted into the needle (or the needle may be pre-inserted into the needle before inserting and injecting the viscoelastic material) or deployed at the tip of the needle. In step 5 of Figure 12, the shunt is positioned at the anterior chamber angle so that the inflow end of the shunt is in the anterior chamber and the outflow end of the shunt is in the suprachoroidal space. In step 6 of Figure 12, the needle is withdrawn from the eye, leaving the shunt in the eye to provide fluid communication between the anterior chamber and the suprachoroidal space, as shown in step 7 of Figure 12.

[0173] In some embodiments, a flexible cannula can be used instead of a needle after injecting the flowable material or composition into the suprachoroidal space, as shown in FIG. 12 . In some embodiments, a flowable composition, such as a viscoelastic composition, can be injected into the eye between the sclera and the choroid / ciliary body through a syringe needle of an injection device disclosed herein to form a suprachoroidal space containing the flowable composition. In some embodiments, the viscoelastic material forms a bleb or bulge between the sclera and the choroid / ciliary body. In some embodiments, the distal tip of a linear member, such as a flexible cannula, can be positioned within the bleb. In some embodiments, the distal tip of the linear member is positioned within the bleb and advanced through the lumen of the syringe needle to further advance between the sclera and the choroid / ciliary body (e.g., toward the anterior chamber angle). In some embodiments, the distal tip of the linear member is inserted through the syringe needle penetration or injection site and advanced toward the bleb along a path created by the syringe needle. The linear member may be inserted through the path formed by the syringe needle while the syringe needle is held in the eye. In some embodiments, the linear member is parallel to the syringe needle, and the two are adjacent to each other in the path created by the syringe needle. In some embodiments, the linear member is disposed within the lumen of the syringe needle. In some embodiments, the syringe needle is within the lumen of the linear member.

[0174] In some embodiments, after the suprachoroidal space is formed, the syringe needle can be removed from the injection site, leaving the suprachoroidal space filled with the viscoelastic material. The injection site may be enlarged, for example, by making a larger incision from the injection site, but does not need to be enlarged and a linear member such as a cannula can be inserted.

[0175] In some embodiments, the linear member, such as a cannula, is a thin, flexible, hollow tube with a smooth, rounded tip at its distal end, and the opposing proximal end may have a hub (e.g., a plastic hub) that can be attached to a syringe. In some embodiments, the shunt may be inserted into the cannula and delivered to the target location through the lumen of the cannula. In some embodiments, the shunt may be advanced along the outer surface of the cannula and delivered to the target location. In some embodiments, the cannula includes a sharp distal tip. In some embodiments, the cannula includes a blunt distal tip. In some embodiments, the distal end of the cannula opens a pathway between structures within tissue, thereby aiding in the dissection of the structures while reducing tissue damage. In some embodiments, the cannula may have an opening at its distal end, for example, for delivering the shunt through the opening.

[0176] In some embodiments, the distal tip of the linear element (e.g., a flexible cannula) in the vesicle of flowable composition can be advanced further into the eye, e.g., between the sclera and the choroid / ciliary body, expanding the suprachoroidal space toward the front of the eye, e.g., toward the anterior chamber angle. In some embodiments, the linear element is configured to conform to the eyeball, and the distal tip is configured to penetrate the anterior chamber. In some embodiments, a flowable composition, such as a viscoelastic composition, lubricates the distal tip of the linear element, allowing it to slide along the boundary between the sclera and the choroid / ciliary body, reducing resistance during cannulation and / or reducing the risk of choroidal perforation or the linear element penetrating the vitreous, ciliary body, or other tissues. In some embodiments, the viscoelastic composition forms a protective layer around the distal tip of the linear element, which can provide lubrication and guide the direction of cannulation, e.g., toward the anterior chamber angle. In some embodiments, the viscoelastic composition further detaches the choroid / ciliary body from the sclera, helping to further expand the suprachoroidal space anteriorly to the eye.

[0177] In some embodiments, after the distal end of the linear member reaches the target location, for example, at a location separated from the anterior chamber angle by a thin layer of tissue, the shunt may be delivered at the target location so that the distal end (or the shunt inside or outside the distal end) pierces the thin layer of tissue and connects the anterior chamber and the suprachoroidal space. In some embodiments, once the shunt has been delivered, the flexible cannula can be withdrawn.

[0178] In some embodiments, provided herein are minimally invasive methods for placing a shunt in the eye using a needle that do not require surgical incision of the entire scleral layer, surgical separation of the sclera from the choroid / ciliary body, or post-operative suturing of scleral or conjunctival incisions. Thus, the methods disclosed herein can reduce tissue invasion, reduce surgical skill requirements, and shorten surgical time.

[0179] As another example, as shown in FIG. 13A , a method for placing a shunt in an eye is disclosed, which includes, in step 1, inserting a needle into the eye through the conjunctiva and sclera to form a delivery channel within the eye that terminates between the sclera and the choroid / ciliary body of the eye. A flowable composition, such as a viscoelastic material, is delivered through the needle to form a suprachoroidal space between the sclera and the choroid / ciliary body. In step 2 in FIG. 13A , the needle may be rotated to position the distal end of the needle away from the anterior chamber angle. The suprachoroidal space can be expanded by the viscoelastic material, providing more space for repositioning the distal end of the needle without damaging the choroid / ciliary body or other surrounding ocular tissues. The shunt may be inserted into the needle (or pre-inserted into the needle prior to needle insertion and injection of the viscoelastic material), and in step 3 in FIG. 13A , the shunt is deployed at the distal end of the needle and then removed. The outflow end of the shunt may be positioned away from the anterior chamber angle, and the other end may be outside the sclera. In step 4 in Figure 13A, the same or a different needle (which may be hollow, but is not required) is used to pierce the sclera, through the suprachoroidal space, and then through the anterior chamber angle of the eye to create an implant channel, as shown in step 5 in Figure 13A. In step 6 in Figure 13A, the other end of the shunt can be inserted into the implant channel to position the inflow end of the shunt in the anterior chamber, thereby positioning the shunt within the eye and providing fluid communication between the anterior chamber and the suprachoroidal space.

[0180] In any embodiment herein, a portion of the shunt may be outside the sclera. In any embodiment herein, the extrascleral portion of the shunt may be subconjunctival. In any embodiment herein, a portion of the shunt may be outside the sclera and conjunctiva. In any embodiment herein, the shunt may include a shunt body outflow port that is outside the sclera and subconjunctiva and / or a shunt body outflow port that is outside the conjunctiva. In any embodiment herein, the shunt may provide fluid communication between the anterior chamber and the suprachoroidal space and between the anterior chamber and the subconjunctival space. In any embodiment herein, the shunt may provide fluid communication between the anterior chamber and the suprachoroidal space and between the anterior chamber and the extraconjunctival space.

[0181] For example, in step 1 in FIG. 13B , the present specification discloses a method for placing a shunt in an eye, which includes cutting an opening in the conjunctiva, peeling the conjunctiva from the sclera to form a conjunctival flap, and then inserting a needle through the sclera into the eye to form a delivery channel within the eye that terminates between the sclera and the choroid / ciliary body of the eye. A flowable composition, such as a viscoelastic material, is delivered through the needle to form a suprachoroidal space between the sclera and the choroid / ciliary body. In step 2 in FIG. 13B , the needle may be rotated to position the distal tip of the needle away from the anterior chamber angle. The suprachoroidal space can be expanded by the viscoelastic material, providing more space for repositioning the distal tip of the needle without damaging the choroid / ciliary body or other surrounding ocular tissues. The shunt may be inserted into the needle (or pre-inserted into the needle prior to needle insertion and injection of the viscoelastic material), and in step 3 in FIG. 13B , the shunt is deployed at the distal end of the needle and then removed. The outflow end of the shunt may be positioned away from the anterior chamber angle, with the other end located outside the sclera. In step 4 in FIG. 13B, as shown in step 5 in FIG. 13B, the same or a different needle (which may, but need not be, hollow) is used to pierce the sclera, pass through the suprachoroidal space, and then through the anterior chamber angle of the eye to form an implant channel. In step 6 in FIG. 13B, the other end of the shunt is inserted into the implant channel to position the inflow end of the shunt within the anterior chamber, thereby positioning the shunt within the eye and providing fluid communication between the anterior chamber and the suprachoroidal space. In step 7 in FIG. 13B, the opening in the conjunctival flap is sutured to cover the extrascleral portion of the shunt. In any of the embodiments herein, the extrascleral portion of the shunt may include a shunt body outflow port, which may be subconjunctival (e.g., covered by a sutured conjunctival flap).

[0182] In any of the embodiments herein, the inflow end, outflow end, and / or shunt body outflow port may include one or more valves, such as check valves, to control fluid flow from the anterior chamber. For example, fluid flow can be controlled from the anterior chamber to the outflow end (e.g., in the suprachoroidal or subconjunctival space) and / or the shunt body outflow port (e.g., in the subconjunctival space or outside the conjunctiva) rather than from the outflow end or shunt body outflow port to an inflow port in the anterior chamber.

[0183] In some examples, as shown in FIG. 14A , the medical puncture device disclosed herein may be used in an intraocular method for placing a shunt in the eye. The needle of the medical puncture device may be inserted into the eye through the cornea, across the anterior chamber, and into the subconjunctival space. A flowable composition, such as a viscoelastic material, is delivered through the needle into the subconjunctival space. The subconjunctival space is expanded by the viscoelastic material, avoiding or reducing the risk of needle penetration into the conjunctiva during the injection process. The shunt is then deployed through the hollow needle to position the outflow end of the shunt within the subconjunctival space, and the inflow end of the shunt is positioned within the anterior chamber after needle removal, providing fluid communication between the anterior chamber and the subconjunctival space. Compared to some other intraocular methods, the method of the present invention may control the injection and expansion of the subconjunctival space, reducing the risk of needle penetration into the conjunctiva.

[0184] In some embodiments, as shown in FIG. 14B , the medical puncture device disclosed herein may be used in an intraocular method for placing a shunt in the eye by inserting a needle through the cornea, across the anterior chamber, and into the suprachoroidal space (SCS). A flowable composition, such as a viscoelastic material, is delivered through the needle into the SCS. The SCS can be expanded by the viscoelastic material. The shunt is then deployed through an empty needle to position the outflow end of the shunt within the SCS, and the inflow end of the shunt is positioned within the anterior chamber after removal of the needle, providing fluid communication between the anterior chamber and the SCS. In some embodiments, the needle has a blunt piercing tip. Compared to some other intraocular methods, the disclosed method can control the injection and expansion of the SCS and reduce the risk of needle puncture into the sclera and / or conjunctiva. In some embodiments, the viscoelastic material is not injected while the distal opening of the needle is positioned within the anterior chamber angle and / or ciliary body. While the distal opening of the needle is positioned between the sclera and the choroid / ciliary body, a viscoelastic material is injected into the potential cavity, expanding the suprachoroidal space.

[0185] It should be understood that any suitable medical puncture device, including but not limited to those described herein with reference to the accompanying drawings, may be used in the methods of drainage from an eye disclosed herein. For example, the medical puncture device shown in FIG. 15A may be used. In some embodiments, the medical puncture device includes a syringe barrel including a proximal end and a distal end, a floating seal within the syringe barrel, a puncture member, such as a needle, at the distal end of the syringe barrel, the puncture member not assembled to the floating seal, and an actuation member configured to resiliently engage the floating seal via an energy storage member, such as a spring, and / or other suitable resilient member. In some embodiments, the puncture member includes a distal opening configured to form fluid communication with a lumen within the syringe barrel containing the flowable composition. In some embodiments, the medical puncture device also includes a stopper within the syringe barrel positioned between the floating seal and the distal end of the syringe barrel. As shown in step 1 in FIG. 15A , the medical puncture device is in an initial state where the distal opening of the puncture member has not entered the target tissue and the distance between the actuating member and the floating seal is x1. In step 2 in FIG. 15A , the distal opening of the puncture member has entered relatively dense tissue (e.g., the sclera, the anterior chamber angle, or the ciliary body) while the distance between the actuating member and the floating seal remains constant (x1). In step 3 in FIG. 15A , when the energy storage member is compressed, for example, by decreasing the distance between the actuating member and the floating seal from x1 to x2, the distal opening of the puncture member is maintained within the relatively dense tissue. In this manner, the energy storage member applies and maintains a force on the floating seal. Pressure is then applied to the relatively dense tissue via the flowable composition and the distal opening of the puncture member. Due to tissue density, the relatively dense tissue exerts back pressure on the distal opening of the puncture member, preventing the flowable composition from being expelled into the tissue. In step 4 in FIG. 15A, the puncture member is advanced distally into less dense tissue such as an apparent or potential tissue void, cavity, or vessel (eg, the SCS or subconjunctival space).In some embodiments, the decrease in tissue density causes the backpressure at the distal opening of the puncture member to be less than the pressure of the flowable composition, thereby allowing the flowable composition to be expelled into less dense tissue, such as apparent or potential tissue voids, cavities, or blood vessels. As the flowable composition is expelled from the distal opening of the puncture member, energy in the energy storage member is released, thereby increasing the distance between the actuation member and the floating seal from x2 to x3, as shown in step 5 in FIG. 15A. For example, a stop can prevent movement of the distal end of the floating seal within the syringe barrel to control the volume of flowable composition delivered to the less dense tissue.

[0186] Another embodiment is shown in FIG. 15B , where in step 1, the medical puncture device is in an initial state where the distal opening of the puncture member has not entered the target tissue. In step 2 in FIG. 15B , the energy storage member may be compressed while the distal opening of the puncture member is maintained outside the tissue, and the floating seal does not advance toward the distal opening, expelling the flowable composition from the distal opening. In step 3 in FIG. 15B , the distal opening of the puncture member enters relatively dense tissue (e.g., the sclera, the anterior chamber angle, or the ciliary body). The energy storage member applies and maintains a force on the floating seal. Pressure is applied to the relatively dense tissue via the flowable composition and the distal opening of the puncture member. Due to tissue density, the relatively dense tissue exerts back pressure on the distal opening of the puncture member, preventing the flowable composition from being expelled into the tissue. In step 4 in FIG. 15B, while the energy storage member remains compressed, the distal opening of the puncture member begins to access less dense tissue, such as an apparent or potential tissue void, cavity, or vessel (e.g., the SCS or subconjunctival space). In step 5 in FIG. 15B, the decrease in tissue density causes the backpressure at the distal opening of the puncture member to become less than the pressure of the flowable composition, allowing the flowable composition to be expelled into the less dense tissue. As the flowable composition is expelled from the distal opening of the puncture member, the energy in the energy storage member is released. In some embodiments, a stopper can prevent movement of the distal end of the floating seal within the syringe barrel to prevent the flow of the flowable composition. In this manner, the volume of the flowable composition delivered to the less dense tissue can be controlled. As shown in step 6 in FIG. 15B, the force applied to the actuation member can be released.

[0187] Further examples are shown in Figure 15C. In some embodiments, the medical puncturing device includes a syringe barrel including a proximal end and a distal end, a floating seal within the syringe barrel, a needle-like puncturing member at the distal end of the syringe barrel, the puncturing member not assembled to the floating seal, and an energy storage member configured to resiliently engage the floating seal and the proximal end of the syringe barrel. In some embodiments, the medical puncturing device also includes a stopper within the syringe barrel positioned between the floating seal and the distal end of the syringe barrel. In some embodiments, the medical puncturing device includes a contact member. In step 1 in Figure 15C, the medical puncturing device is in an initial state in which the distal opening of the puncturing member is positioned within the contact member, preventing the flowable composition from being discharged from the distal opening. The energy storage member applies a force to the floating seal, which in turn applies pressure to the contact member via the flowable composition and the distal opening of the puncturing member. Due to the density of the contact member, backpressure at the distal opening of the puncture member prevents leakage of the flowable composition from the syringe barrel. In step 2 in FIG. 15C, the distal opening of the puncture member enters relatively dense tissue (e.g., the sclera, the anterior chamber angle, or the ciliary body), and the backpressure of the relatively dense tissue at the distal opening prevents leakage of the flowable composition into the tissue. In step 3 in FIG. 15C, the distal opening of the puncture member begins accessing less dense tissue, such as an apparent or potential tissue void, cavity, or vessel (e.g., the SCS or subconjunctival space). In step 4 in FIG. 15C, due to the decrease in tissue density, the backpressure at the distal opening of the puncture member becomes less than the pressure of the flowable composition, and the flowable composition is expelled into the less dense tissue. As the flowable composition is expelled from the distal opening of the puncture member, the energy in the energy storage member is released. In some embodiments, a stopper can prevent movement of the distal end of a floating seal within the syringe barrel to prevent flow of the flowable composition. In this manner, the volume of flowable composition delivered to the less dense tissue can be controlled.

[0188] The exemplary embodiments and optional implementations of the present disclosure have been described in detail above in combination with the drawings. However, the present invention is not limited to the details described in the above-mentioned embodiments. Simple modifications can be applied to the embodiments of the present disclosure, all of which are within the scope of the present disclosure.

[0189] It should be noted that the technical features described in the above embodiments may be reasonably combined in any manner as long as they are not contradictory. To avoid unnecessary repetition, possible combinations are not individually described in the embodiments.

[0190] Furthermore, different implementations of the embodiments of the present invention can be freely combined, and as long as they do not contradict the spirit of the present disclosure, they should also be considered as part of the present disclosure.

Claims

1. 1. A system for placing a shunt in an eye, comprising: a syringe barrel including a proximal end and a distal end; a floating seal within the syringe barrel; a needle hub located proximal to the floating seal, the floating seal and the needle hub elastically engaging with each other; a needle for insertion into the eye, said needle comprising: (i) a needle proximal end that engages the needle base; (ii) a needle distal end; (iii) a needle distal opening; and (iv) a needle body opening between the needle proximal end and the needle distal end, the needle body opening being proximal to the needle distal opening; (v) a needle body passageway connecting the needle distal opening and the needle body opening; the needle hub is configured to advance the needle distally toward and / or through the floating seal; The system, wherein the shunt is configured to be releasably coupled to the needle.

2. The system of claim 1 , wherein the shunt is an intraocular shunt within the needle and / or forms a sleeve around the needle, and the shunt comprises a solid structure, a porous structure, a multi-layer composite structure, a membrane stent structure, or any combination thereof.

3. the shunt includes one or more annular rings in a sidewall of the shunt; The system of claim 1 , comprising a marker ring and a retaining ring on the sidewall of the shunt.

4. The system of claim 1 , wherein the shunt includes a plurality of channels extending from one end of the shunt to the other.

5. The system of claim 1 , wherein the inflow end of the shunt is positioned in the anterior chamber of the eye and the outflow end of the shunt is positioned in a target outflow area.

6. 6. The system of claim 5, wherein the target outflow area is an expanded space within the eye and / or the target outflow area is between the sclera and the choroid / ciliary body.

7. The system of claim 6 , wherein the target outflow region is the suprachoroidal space.

8. The system of claim 5 , wherein the target outflow area is between the conjunctiva and the sclera.

9. The system of claim 8 , wherein the target outflow area is a subconjunctival bleb located within the subconjunctival space.

10. The system of claim 1 , further comprising a guidewire for distally advancing the shunt through / around the needle.

11. a shunt body outflow port located between the inflow end of the shunt and the outflow end of the shunt; The system of claim 1 , wherein the shunt body outflow port is positioned subconjunctivally.

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