US20130158468A1 - Delivering and/or receiving material with respect to a subject surface - Google Patents
Delivering and/or receiving material with respect to a subject surface Download PDFInfo
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- US20130158468A1 US20130158468A1 US13/718,196 US201213718196A US2013158468A1 US 20130158468 A1 US20130158468 A1 US 20130158468A1 US 201213718196 A US201213718196 A US 201213718196A US 2013158468 A1 US2013158468 A1 US 2013158468A1
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- actuator
- fluid
- skin
- flow activator
- needles
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150015—Source of blood
- A61B5/150022—Source of blood for capillary blood or interstitial fluid
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150053—Details for enhanced collection of blood or interstitial fluid at the sample site, e.g. by applying compression, heat, vibration, ultrasound, suction or vacuum to tissue; for reduction of pain or discomfort; Skin piercing elements, e.g. blades, needles, lancets or canulas, with adjustable piercing speed
- A61B5/150061—Means for enhancing collection
- A61B5/150099—Means for enhancing collection by negative pressure, other than vacuum extraction into a syringe by pulling on the piston rod or into pre-evacuated tubes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150374—Details of piercing elements or protective means for preventing accidental injuries by such piercing elements
- A61B5/150381—Design of piercing elements
- A61B5/150412—Pointed piercing elements, e.g. needles, lancets for piercing the skin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150969—Low-profile devices which resemble patches or plasters, e.g. also allowing collection of blood samples for testing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150977—Arrays of piercing elements for simultaneous piercing
- A61B5/150984—Microneedles or microblades
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/151—Devices specially adapted for taking samples of capillary blood, e.g. by lancets, needles or blades
- A61B5/15101—Details
- A61B5/15103—Piercing procedure
- A61B5/15107—Piercing being assisted by a triggering mechanism
- A61B5/15113—Manually triggered, i.e. the triggering requires a deliberate action by the user such as pressing a drive button
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/151—Devices specially adapted for taking samples of capillary blood, e.g. by lancets, needles or blades
- A61B5/15186—Devices loaded with a single lancet, i.e. a single lancet with or without a casing is loaded into a reusable drive device and then discarded after use; drive devices reloadable for multiple use
- A61B5/15188—Constructional features of reusable driving devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
- A61M1/38—Removing constituents from donor blood and storing or returning remainder to body, e.g. for transfusion
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M37/00—Other apparatus for introducing media into the body; Percutany, i.e. introducing medicines into the body by diffusion through the skin
- A61M37/0015—Other apparatus for introducing media into the body; Percutany, i.e. introducing medicines into the body by diffusion through the skin by using microneedles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M37/00—Other apparatus for introducing media into the body; Percutany, i.e. introducing medicines into the body by diffusion through the skin
- A61M37/0015—Other apparatus for introducing media into the body; Percutany, i.e. introducing medicines into the body by diffusion through the skin by using microneedles
- A61M2037/0023—Drug applicators using microneedles
Abstract
Description
- This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/577,399, filed Dec. 19, 2011, entitled “Delivering and/or Receiving Material with Respect to a Subject Surface,” by Bernstein, et al., which is incorporated herein by reference.
- The present invention generally relates to systems and methods for delivering to and/or receiving fluids or other materials, such as blood or interstitial fluid, from subjects, e.g., to or from the skin and/or beneath the skin.
- In some embodiments, the present invention generally relates to devices and methods for receiving fluids from a subject, such as the reception and separation of blood to form plasma or serum. The subject matter of the present invention involves, in some cases, interrelated products, alternative solutions to a particular problem, and/or a plurality of different uses of one or more systems and/or articles.
- In one aspect of the invention, the device includes a flow activator arranged to cause fluid to be released from a subject. The flow activator may be moved in a deployment direction by a deployment actuator. The flow activator may also be moved in a retraction direction by a retraction actuator. In one aspect, the flow activator may be at a distance from the opening before deployment that is different from its distance from the opening after retraction.
- In another aspect of the invention, an effector that includes only mechanical components moves the flow activator for deployment and retraction. Deployment movement may occur substantially faster than retraction movement.
- In another aspect of the invention, the device may include a vacuum source that provides a pressure less than ambient pressure. The device may also include a channel that is fluidly coupled between the opening and the vacuum source. In one aspect of the invention, fluid communication between the opening and the vacuum source along the channel is enabled in response to actuation of the flow activator. In another aspect, fluid communication between the opening and the vacuum source is enabled in response to retraction of the flow activator. In another aspect, an effector actuates the flow activator and enables fluid communication between the opening and vacuum source.
- In another aspect of the invention, the device includes a seal that is capable of closing fluid communication between the opening and the vacuum source through the channel. The seal and the flow activator may be attached together.
- In another aspect of the invention, the effector may have an initial stored potential energy prior to any deployment movement of the flow activator. The effector may be arranged to release the stored potential energy to retract the flow activator.
- In another aspect of the invention, flow activator, retraction actuator, and deployment actuator may be concentrically aligned with one another. Additionally, the device may include a spacer element that is also concentrically aligned with the flow activator, retraction actuator, and deployment actuator.
- In another aspect, the present invention encompasses methods of making one or more of the embodiments described herein, for example, a device for receiving fluid. In still another aspect, the present invention encompasses methods of using one or more of the embodiments described herein, for example, a device for receiving fluid.
- Other advantages and novel features of the present invention will become apparent from the following detailed description of various non-limiting embodiments of the invention when considered in conjunction with the accompanying figures. In cases where the present specification and a document incorporated by reference include conflicting and/or inconsistent disclosure, the present specification shall control. If two or more documents incorporated by reference include conflicting and/or inconsistent disclosure with respect to each other, then the document having the later effective date shall control.
- Non-limiting embodiments that incorporate one or more aspects of the invention will be described by way of example with reference to the accompanying figures, which are schematic and are not necessarily intended to be drawn to scale. In the figures, each identical or nearly identical component illustrated is typically represented by a single numeral. For purposes of clarity, not every component is labeled in every figure, nor is every component of each embodiment of the invention shown where illustration is not necessary to allow those of ordinary skill in the art to understand the invention. In the figures:
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FIG. 1 is a perspective view of a material delivery/receiving device in accordance with aspects of the invention; -
FIG. 2 is a perspective view of the of a material delivery/receiving device ofFIG. 1 ; -
FIG. 3 is a perspective view of the device in shownFIG. 1 with the cover removed; -
FIG. 4 is a cross-sectional view of the device shown inFIG. 1 ; -
FIG. 5 is an exploded view of the device shown inFIG. 1 ; -
FIGS. 6A-6C show a series of three states of a flow activator of the device ofFIG. 1 ; -
FIG. 7A is an enlarged view of an effector including a retraction actuator and deployment actuator in a specific arrangement; -
FIG. 7B is an underside view of the arrangement shown inFIG. 7A ; -
FIG. 8 is a close up view of a release element for the retraction actuator of the device inFIG. 1 ; -
FIG. 9 is an enlarged view of a portion of a retraction actuator; -
FIG. 10 is an enlarged view of a region of the device shown inFIG. 1 that illustrates a relationship between a storage vessel and a vacuum source; -
FIG. 11 is a perspective view of a device in yet another embodiment of the invention, having separate retractor and seal actuator portions; -
FIG. 12 is an enlarged view of the retractor and seal actuator in the device shown inFIG. 11 ; -
FIG. 13 is an exploded view of the device shown inFIG. 11 ; -
FIG. 14 is a cross-sectional view of the device shown inFIG. 11 ; -
FIG. 15 is a perspective view of a device in yet another embodiment of the invention, having a rotatable release element; -
FIG. 16 is an enlargement of a ramp engagement region in the device shown inFIG. 15 ; -
FIG. 17 is an exploded view of the device shown inFIG. 15 ; -
FIG. 18 is a cross-sectional view of the device shown inFIG. 15 ; -
FIG. 19 is a perspective view of a device in yet another embodiment of the invention, having a sliding trigger tip; -
FIG. 20 is a perspective view of the underside of the device shown inFIG. 19 ; -
FIG. 21 is a perspective view of the device shown inFIG. 19 with the cover removed; -
FIG. 22 is a perspective view of the device shown inFIG. 19 with the cover removed and at a different angle than the view shown inFIG. 21 ; -
FIG. 23A is an enlargement of a trigger bridge from the device shown inFIG. 22 ; -
FIG. 23B is an underside of the enlargement shown inFIG. 23A ; -
FIG. 24 is an exploded view of the device shown inFIG. 19 ; -
FIG. 25 is a cross-sectional view of the device shown inFIG. 19 ; -
FIGS. 26A-26D show alternative arrangements for connecting a flow activator to a deployment actuator; -
FIG. 27 is a cross sectional view of a material delivery/receiving device in another embodiment; and -
FIG. 28 shows perspective views of two configurations for theFIG. 27 embodiment. - Aspects of the invention are not limited in application to the details of construction and the arrangement of components set forth in the following description or illustrated in the drawings. For example, illustrative embodiments relating to piercing skin and receiving blood released from the pierced skin are discussed below, but aspects of the invention are not limited to use with devices that pierce skin and/or receive blood. Other embodiments may be employed, such as devices that receive other bodily fluids without piercing, devices that deliver drugs and/or other materials with or without piercing, and aspects of the inventions may be practiced or be carried out in various ways. Also, the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
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FIG. 1 shows a material delivery/receiving device 1 that incorporates various aspects of the invention. AlthoughFIG. 1 incorporates many of the aspects of the invention, any suitable number of aspects of the invention may be incorporated into a material delivery/receiving device. Thus, aspects of the invention may be used alone or in any suitable combination with each other. This illustrative embodiment includes acover 20 and a base 100 that are joined together and may cooperate to enclose various parts of thedevice 1 and support one or more external features, such as adevice actuator 10 that is used to cause thedevice 1 to receive fluid from a subject. Thebase 100 and thecover 20 may be formed from or otherwise include Polyester (PCTA or PETG) or other polymers with low gas permeability. Although thedevice actuator 10 in this embodiment is arranged to be actuated by a user (e.g., by the press of a finger), thedevice actuator 10 may be arranged in other ways, e.g., for actuation by a machine, an electrical signal, or other suitable arrangement to cause the material delivery/receiving device 1 to receive fluid from a subject. Actuation of thedevice actuator 10 may occur automatically, e.g., in response to an elapsed timer or other stimulus or condition, or manually. In some embodiments, thedevice actuator 10 may include a push-button as shown, a sliding button discussed more below, a touch-screen interface, a switch, or other user-actuatable arrangement, etc. In some cases, thedevice actuator 10 may allow for actuation of thedevice 1 only once, e.g., thedevice actuator 10 may become locked in a position that prevents further actuation, or may allow thedevice 1 to be actuated multiple times. - According to one aspect of the invention, the
device 1 may include a fluid transporter that receives fluid from a subject and/or delivers fluid to a subject. The fluid transporter may include an applicator region where bodily fluids from the body may accumulate. In some embodiments, the applicator region may be a recess or an indentation within the base of the device, which can receive a fluid from the surface of the skin or deliver a fluid to the skin. The applicator region may have any suitable shape. For example, the applicator region can be generally hemispherical, semi-oval, rectangular, irregular, etc. - The fluid transporter may include an opening of any size and/or geometry that is constructed to receive fluid into the device. For example, the opening may lie in a two-dimensional plane or the opening may include a three-dimensional cavity, hole, groove, slit, etc. In some embodiments, the fluid transporter may also include a flow activator, such as one or more microneedles, arranged to cause fluid to be released from or delivered to the subject, e.g., by piercing the skin of a subject. In some embodiments, if fluid may partially or fully fill an enclosure surrounding a flow activator, then the enclosure can define at least part of a fluid transporter.
- It should be noted that a flow activator need not be included with all embodiments as the device may not necessarily employ a mechanism for causing fluid release from/delivery to the subject. For instance, the device may receive fluid that has already been released due to another cause, such as a cut or an abrasion, fluid release due to a separate and independent device, such as a separate lancet, an open fluid access such as during a surgical operation, and so on. Additionally, fluid may be introduced into the device via urination, spitting, pouring fluid into the device, etc. If included, a flow activator may physically penetrate, pierce, and/or or abrade, chemically peel, corrode and/or irritate, release and/or produce electromagnetic, acoustic or other waves, other otherwise operate to cause fluid release from/material delivery to a subject. The flow activator may include a moveable mechanism, e.g., to move a needle, or may not require movement to function. For example, the flow activator may include a jet injector or a “hypospray” that delivers fluid under pressure to a subject, a pneumatic system that delivers and/or receives fluid, a hygroscopic agent that adsorbs or absorbs fluid, a reverse iontophoresis system, a transducer that emits ultrasonic waves, or thermal, radiofrequency and/or laser energy, and so on, any of which need not necessarily require movement of a flow activator to cause fluid release from a subject.
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FIG. 2 shows an underside of the material delivery/receiving device 1 ofFIG. 1 with afluid transporter 120 that includes anopening 130, anapplicator region 131, and aflow activator 90. In this embodiment, theflow activator 90 includes one or more needles. As described in more detail below, the needles may be extended from theopening 130 to pierce a subject's skin, and then retracted back into the opening to allow blood or other fluid to enter theopening 130. That is, to use thedevice 1 to receive blood from a subject, thebase 100 may be placed on the skin so that theopening 130 is adjacent the skin. Thereafter, thedevice actuator 10 may be depressed to cause the needles to be deployed, piercing the skin and causing blood to be released. Blood may enter the opening and be collected in thestorage chamber 140. In one embodiment, blood may flow into thestorage chamber 140 as a result of a relatively low pressure (vacuum) in thedevice 1 that draws blood from theopening 130 and into the storage chamber 140 (seeFIG. 4 ). In other embodiments discussed in more detail below, a drug or other material may be delivered to the skin (below and/or on the skin surface) by needles piercing the skin and carrying the material into the skin and/or functioning as a conduit to carry the material into the skin (e.g., by a relatively high pressure in thedevice 1 that forces the material from thestorage chamber 140 and into the skin by way of the needles or openings in the skin formed by the needles). - The needles may be of any suitable width, length and/or other size, and the needles may each be solid or hollow. Hollow needles or needles that otherwise have a flow channel may be used to transport material, such as a liquid carrier and drug, into the skin. The needles may have any suitable cross-section (e.g., perpendicular to the direction of penetration), such as circular, square, oval, elliptical, rectangular, rounded rectangle, triangular, polygonal, hexagonal, irregular, etc. In some embodiments, the needles may have a length of about 5 mm or less. Additional information regarding alternative needle arrangements is provided below.
- In this embodiment (
FIG. 4 ), activation of thedevice actuator 10 causes theflow activator 90 to release blood or other fluid from a subject, which is then received at theopening 130. The blood or other fluid may then be collected in one ormore chambers 140. Collection of the blood or other fluid may be done in any suitable way, such as by absorption, capillary action, suction, or other means. In this illustrative embodiment, activation of thedevice actuator 10 causes aseal 76 to open so that blood or other fluid may flow from theopening 130, through a channel (seeFIG. 4 , element 110) to achamber 140. As is explained more below, thedevice 1 may include a vacuum source that draws the blood or other fluid from theopening 130 and into thechamber 140 upon opening of theseal 76. That is, opening of theseal 76 may introduce a relatively low pressure to thechamber 140, which causes blood or other fluid to be drawn from theopening 130 and into thechamber 140. - In one aspect of the invention, the flow activator may be actuated by a deployment actuator and a retraction actuator. For example, the flow activator may be moveable and movement of the flow activator may be caused by a deployment actuator and a retraction actuator. The deployment actuator may cause the flow activator to move in a deployment direction towards the skin and/or other surface of a subject, and the retraction actuator may cause the flow activator to move in a retraction direction away from the skin and/or body of a subject. As discussed in more detail below, providing separate actuators for deployment and retraction movement may provide advantages in some cases, such as enabling the flow activator to be moved at different speeds for deployment and retraction, allowing the actuators to perform other additional functions such as opening a fluid flow path for blood or other fluid, enabling the flow activator to start and finish at different positions in the device before deployment and after retraction, and others. The deployment actuator and the retraction actuator may each include any suitable components, such as a button, a switch, a lever, a slider, a dial, a compression spring, a Belleville spring, a servo, rotary or linear electric motor, and/or a pneumatic apparatus, or other suitable device. Also, the deployment actuator and the retraction actuator may be of the same type, or may be different types of devices. Each actuator may operate manually, mechanically, electrically, pneumatically, electromagnetically, or other suitable mode of operation, and may or may not require user input for activation.
- In accordance with an aspect of the invention, an effector may be arranged to cause deployment and/or retraction movement of a flow activator. For example, an effector may include both a deployment actuator and a retraction actuator. The effector may be formed from or otherwise include polyester (PETG or PCTA), or acetal resin, acrylonitrile butadiene styrene (ABS), etc.
FIGS. 3 , 4, and 5 illustrate a perspective view ofdevice 1 ofFIG. 1 with thecover 20 removed from thebase 100, a partial cross sectional view of thedevice 1, and an exploded view of thedevice 1, respectively. In this embodiment, thedevice 1 includes aneffector 50 that includes aretraction actuator 40 and adeployment actuator 60 and that is movable in up and down directions relative to thebase 100 along effector guides 104. Thedeployment actuator 60 is attached to theflow activator 90 via a membrane 72 (seeFIG. 4 ) so that downward movement of thedeployment actuator 60 may cause theflow activator 90 to at least partially extend from theopening 130. (As discussed more below, themembrane 72 may separate avacuum source 156 in thedevice 1 from theopening 130 so that a relatively low pressure is maintained in thevacuum source 156 until controllably opened to cause flow into thestorage chamber 140.) Thevacuum source 156 may be in the form of a sealed vacuum chamber. In this embodiment, thedeployment actuator 60 has a generally domed shape (e.g., as in a Belleville spring) with a central hole that receives a part of themembrane 72 which attaches thedeployment actuator 60 to theflow activator 90. (Although in this embodiment theflow activator 90 is attached to thedeployment actuator 60 via themembrane 72, theflow activator 90 may be directly connected to thedeployment actuator 60, e.g., via a vertical post or other structure that extends from theflow activator 90 to thedeployment actuator 60.) Thedeployment actuator 60 may initially be arranged in a concave-down configuration shown inFIG. 4 and moved to a concave-up configuration, e.g., by a user pressing thedevice actuator 10 to cause arelease element 30 to push a center portion of thedeployment actuator 60 downwardly. Thedeployment actuator 60 may be made of a suitable material and configuration to rapidly move from the concave-down to concave-up configurations so as to rapidly extend theflow activator 90 from theopening 130 and pierce a subject's skin or other surface. While thedeployment actuator 60 in this embodiment is arranged as a flexible spring with a dome shape, thedeployment actuator 60 may be of any suitable shape and/or size. For example, thedeployment actuator 60 may be circular (having no “legs” unlike the four legs shown inFIG. 5 ), oblong, triangular (have 3 legs), square (4 legs with straight sides between each leg), pentagonal (5 legs), hexagonal (6 legs), spider-legged, star-like, clover-shaped (with any number of lobes, e.g., 2, 3, 4, 5, etc.), a serrated disc or a wave shape, or the like. Thedeployment actuator 60 may have, in some embodiments, a central hole as shown or another feature, such as a dimple, or button in the center or other location. Thedeployment actuator 60 may be formed from or otherwise include any suitable material, for example, a metal such as stainless steel (e.g., 301, 301LN, 304, 304L, 304LN, 304H, 305, 312, 321, 321H, 316, 316L, 316LN, 316Ti, 317L, 409, 410, 430, 440A, 440B, 440C, 440F, 904L), carbon steel, spring steel, spring brass, phosphor bronze, beryllium copper, titanium, titanium alloy steels, chrome vanadium, nickel alloy steels (e.g.,Monel 400, Monel K 500, Inconel 600, Inconel 718, Inconel x 750, etc.), a polymer (e.g., polyvinylchloride, polypropylene, polycarbonate, etc.), a composite or a laminate (e.g., comprising fiberglass, carbon fiber, bamboo, Kevlar, etc.), or the like. - In some embodiments, all portions of the deployment actuator may move less than a certain distance when the deployment actuator moves in a deployment direction towards
opening 130. In some embodiments, all portions of the deployment actuator may move less than about 10 mm, less than about 5 mm, less than about 3 mm, less than about 2 mm, or less than about 1 mm. Theretraction actuator 40 in this embodiment includes a reversibly deformable structure in the form of a leaf spring, but, like thedeployment actuator 60, other arrangements are possible such as a coil spring, foam, an elastic bladder, or the like. The retraction actuator may be formed from or otherwise include any suitable material, for example, 1095 spring steel or 301 stainless steel or other spring material such as 1074/1075, 5160, 9255 spring steel etc. Theretraction actuator 40 is attached to thedeployment actuator 60 via theeffector body 50 so that when theretraction actuator 40 is released upon actuation of thedevice actuator 10, the retraction actuator 40 (and other portions of the effector 50) can move away from theopening 130 along the effector guides 104. This retraction motion draws theflow activator 90 and thedeployment actuator 60 away from the opening as well. Specifically, and as shown at least in part inFIGS. 4 and 5 , before actuation of thedevice 1, theretraction actuator 40 is in a compressed state, storing potential energy. That is, the center of theretraction actuator 40 is pressed downwardly during assembly so that four arms of theretraction actuator 40 are elastically deformed. Theretraction actuator 40 is held in this depressed condition by ear portions 103 (seeFIGS. 8 and 9 ) of theretraction actuator 40 engaging with the base 100 until thedevice 1 is actuated. However, when thedevice actuator 10 is pushed down during device actuation,arms 31 of therelease element 30 engage with thetabs 41 to release theear portions 103 from thebase 100, allowing the center portion of theretraction actuator 40 to move in a retraction direction away from theopening 130. Since thedeployment actuator 60 andflow activator 90 are attached to theretraction actuator 40, movement of theretraction actuator 40 upward away from theopening 130 retracts theflow activator 90 from theopening 130. Additionally, movement of theretraction actuator 40 upward away from theopening 130 may also move thedeployment actuator 60 in a retraction direction away from theopening 130 as well. In some embodiments, all portions of thedeployment actuator 60 may move less than a certain distance when thedeployment actuator 60 moves in a retraction direction away from theopening 130. In some embodiments, all portions of the deployment actuator may move less than about 10 mm, less than about 5 mm, less than about 3 mm, less than about 2 mm, or less than about 1 mm. - In some embodiments, as shown in
FIG. 4 , aspacer element 32 is located between thedeployment actuator 60 and theretraction actuator 40. Thespacer element 32 may help to eliminate a gap between thedeployment actuator 60 and therelease element 30. Actuation ofdevice actuator 10 may cause therelease element 30 to push down on thespacer element 32, which may in turn push on thedeployment actuator 60 and cause thedeployment actuator 60 to move theflow activator 90 in a deployment direction. In some embodiments, theflow activator 90,deployment actuator 60,retraction actuator 40, andspacer element 32 are substantially concentrically aligned. - By providing both a
deployment actuator 60 and aretraction actuator 40 for theflow activator 90, theflow activator 90 may be controlled to have any suitable movement for both deployment and retraction. For example, theflow activator 90 may be caused to move more rapidly in the deployment direction than in the retraction direction, which has been found to potentially reduce pain when piercing skin to release blood and/or deliver material to the skin. That is, thedeployment actuator 60 may be arranged to relatively rapidly move from the concave-down to concave-up configuration, quickly inserting theflow activator 90 into skin or another surface. Thereafter, theflow activator 90 may be more slowly withdrawn from the skin by theretraction actuator 40, e.g., as controlled by a relatively lower force exerted by theretraction actuator 40 on theflow activator 90 than thedeployment actuator 60, by damped motion of theretraction actuator 40, or other suitable arrangements. In other embodiments, having separate deployment and retraction actuators may allow for a shorter range of motion in one direction, such as in the deployment direction, than in another direction, such as the retraction direction. For example, by having theflow activator 90 move a relatively short distance for deployment, thedeployment actuator 60 may be made relatively compact, yet generate suitably high force to insert theflow activator 90 into skin. In contrast, a relatively longer distance traveled by theflow activator 90 during retraction may withdraw theactivator 90 suitably to allow a pool or other collection of blood to enter a cavity or other space for reception by thedevice 1. Additionally, a short deployment distance may minimize alignment errors inherent in long travel distances. - Accordingly, in one aspect of the invention, the flow activator may be located at an initial pre-deployment distance from skin or another surface that is different from a final post-retraction distance between the flow activator and the skin or other surface. While this aspect can be provided in many different ways, such as by a motor, servo, or automated device as part of an effector, the
effector 50 of theFIGS. 1-5 embodiment may provide an arrangement in which flowactivator 90 is relatively close to theopening 130 prior to deployment, and is located relatively further away from theopening 130 after retraction.FIGS. 6A-6C show a series of schematic representations of three states of thedevice 1 ofFIGS. 1-5 , including an initial state before deployment of theflow activator 90, an intermediate state where the flow activator is extended from theopening 130 or otherwise positioned to cause release of fluid from a target skin or other surface, and a final state where theflow activator 90 is retracted, respectively. - As can be seen in
FIG. 6A , apre-deployment distance 181 between theopening 130 and theflow activator 90 is relatively small, such as 1 mm or less. In this state, theretraction actuator 40 is compressed, and thedeployment actuator 60 is in a concave-down arrangement. As shown inFIG. 6B , thedeployment actuator 60 is inverted to a concave-up configuration so that theflow activator 90 is deployed. Theretraction actuator 40 may also be further compressed, e.g., by the user pressing down on therelease element 30, but in other embodiments, theretraction actuator 40 need not be further compressed or otherwise deformed. As shown inFIG. 6C , apost-retraction distance 183 between theopening 130 and theflow activator 90 may be larger, in some cases significantly larger, than thepre-deployment distance 181. For example, thepost-retraction distance 183 in which theflow activator 90 is fully retracted from theopening 130 may be 2-3 mm or more. Retraction of theflow activator 90 from theopening 130 may provide a space into which blood or other fluid released from the subject may collect and/or otherwise be received by thedevice 1. However, other arrangements are possible in which the post-retraction distance is less than, or the same as, the pre-deployment distance, and all aspects of the invention are not necessarily limited in this regard. -
FIGS. 7A and 7B show top perspective and bottom perspective views of theeffector 50 of theFIGS. 1-5 embodiment, and help to better illustrate how the motion of theeffector 50 is controlled. As shown inFIG. 7A , theretraction actuator 40 has eight legs radiating from a central body having a central hole. Two of the shorter legs attach theretraction actuator 40 to theeffector body 50 via twoposts 52 that extend throughholes 46 of theretraction actuator 40. The diameter of the post heads 52 may be made larger than theholes 46 and thus fix theretraction actuator 40 to theeffector body 50. Theretraction actuator 40 may alternately be attached to the effector body by 50 by adhesive (e.g. tape, liquid), mechanical fastening (e.g. interference fit, slot/groove, screws) or thermal methods (e.g. heat staking), and is not limited in this regard.Other legs 48 of theretraction actuator 40 may remain free to flex relative to theeffector body 50, e.g., to provide the retraction movement of theeffector 50. Two of thelegs 48 includeear portions 103 which serve to engage with thebase 100 and hold theretraction actuator 40 in a compressed, initial position before deployment of theflow activator 90. A space orgap 43 is provided between theear portions 103 and theeffector body 50 to allow theear portions 103 to move toward the body for engagement with thebase 100. As described above and shown inFIG. 7B , thedeployment actuator 60 includes acentral hole 66 andlobes 62 that are held within thegrooves 56 of theeffector body 50. Although thedeployment actuator 60 is attached to theeffector body 50, acentral portion 64 of thedeployment actuator 60 remains displaceable relative to theeffector body 50 so that thedeployment actuator 60 may move to deploy theflow activator 90. - As discussed above, the
effector 50 may be mounted to thebase 100 and guided in motion via effector guides 104 that protrude from thebase 100.FIG. 8 shows a close up view of theretraction actuator 40 illustrating how theretraction actuator 40 engages with the base 100 in a compressed, initial state, whileFIG. 9 shows a close up view of theear portions 103 on two of thelegs 48 of theretraction actuator 40 that engage with the base 100 to hold theretraction actuator 40 in the compressed, initial state. With theeffector 50 held suitably by the effector guides 104, theeffector 50 is pressed downwardly so thatear portions 103 of thetabs 41 can be positioned under correspondingprotrusions 101 on thebase 100. With theear portions 103 engaged with theprotrusions 101, theeffector 50 may be released so that the spring force of thelegs 48 biases theeffector 50 to move upwardly in the retraction direction. However, with theear portions 103 engaged with theprotrusions 101, theeffector 50 is held in a compressed condition. In this pre-deployment arrangement, theflow activator 90 may be at the initial pre-deployment distance 181 (seeFIG. 6 ) from theopening 130. In some embodiments, thispre-deployment distance 181 may be arranged such that actuation of thedeployment actuator 60 will cause theflow activator 90 to reach the skin of a subject and allow theflow activator 90 to penetrate and/or pierce the skin to cause fluid flow. Thus, having theretraction actuator 40 pre-loaded in an initial semi-compressed state may hold theflow activator 90 at apre-deployment distance 181 that enables theflow activator 90 to be ready for deployment upon actuation of thedevice actuator 10. -
FIG. 8 also illustrates how theretraction actuator 40 may be released to retract theflow activator 90.Arms 31 of therelease element 30 may engage with thetabs 41 so that sloped portions of thearms 31 push thetabs 41 outwardly and away from theeffector body 50 when thedevice actuator 10 and therelease element 30 are moved downwardly. This releases theear portions 103 from theprotrusions 101, allowing theeffector 50 to move upwardly under the bias of the deformed legs of theretraction actuator 40. Therelease element 30 may be formed from or otherwise include polyester (PETG or PCTA), or acetal resin, acrylonitrile butadiene styrene (ABS), etc. While in this embodiment theretraction actuator 40 is shown to engage with thebase 100 via a releasable latch arrangement that includes theear portions 103 and theprotrusions 101, other arrangements are possible, such as a releasable lever, a sliding release, a detent, magnets that are separable using a wedge or by flipping polarity, etc., as the invention is not limited in this regard. - In another aspect of the invention, the effector may have an initial stored potential energy prior to any deployment movement of the flow activator. That is, the effector may have stored spring energy or other mechanical energy stored, for example, in an elastically deformed element, stored chemical energy, stored electrical energy, etc., that is used to deploy and/or retract a flow activator or cause other motion of other parts of the fluid receiving device. As explained above, before deployment of the
flow activator 90, theretraction actuator 40 may be held in a compressed state by engagement of theear portions 103 of thelegs 48 withprotrusion elements 101 on thebase 100. Compression of theretraction actuator 40 stores potential energy in theretraction actuator 40 that can be used for different actions, such as retracting theflow activator 90. Thus, having theretraction actuator 40 at an initial compressed state permits theretraction actuator 40 to store potential energy and be ready for actuation without requiring energy to be input to the system at the time of actuation of the device. - In another aspect of the invention, the flow activator may move faster in a deployment direction than in a retraction direction. In the embodiments discussed above, the
deployment actuator 60 may be arranged to move from an initial, pre-deployment position to a deployment position in rapid fashion, e.g., in a bi-stable manner. In contrast, theretraction actuator 40 may be arranged, e.g., to have a relatively lower spring constant or other characteristic, to move theflow activator 90 at a slower rate during at least a part of the retraction motion. In one set of embodiments, theflow activator 90 can be deployed at a speed of at least about 0.1 cm/s, at least about 0.3 cm/s, about 1 cm/s, at least about 3 cm/s, at least about 10 cm/s, at least about 30 cm/s, at least about 1 m/s, at least about 2 m/s, at least about 3 m/s, at least about 4 m/s, at least about 5 m/s, at least about 6 m/s, at least about 7 m/s, at least about 8 m/s, at least about 9 m/s, at least about 10 m/s, at least about 12 m/s, etc., at the point where theflow activator 90 initially contacts the skin. Without wishing to be bound by any theory, it is believed that relatively faster deployment speeds may increase the ability of the flow activator to penetrate the skin (without deforming the skin or causing the skin to move in response), and/or decrease the amount of pain felt by the application of the flow activator to the skin. Any suitable method of controlling the penetration speed into the skin may be used, including those described herein. - Retraction of the
flow activator 90 may occur at a slower speed than deployment, e.g., to help reduce any pain associated with withdrawal of theflow activator 90. Where theretraction actuator 40 includes only mechanical elements that are not electronically controlled, e.g., as in the case of a spring, an elastic member, collapsible foam, etc., the spring or other element may be designed or otherwise arranged to provide a desired retraction speed. Alternately, other mechanical elements, such as one or more dampers may be provided to control a withdrawal speed. Other, electronically controlled systems, such as some servos, pneumatic systems, or the like, may incorporate open or closed loop control to provide a desired retraction rate. In the case of a manually-operated retraction actuator, the user may be able to control the speed of retraction. For example, a retraction actuator in the form of a spring may retract more slowly if force is gradually eased off the device actuator. However, if the force is abruptly removed, (e.g. a user suddenly releases the device actuator), the retraction may occur more quickly, although the fastest possible retraction speed may still be slower than the deployment speed. - In some aspects, the fluid receiving device may contain one or more chambers or
vessels 140 for holding fluid received from a subject. In some cases, the chambers may be in fluidic communication with one or more fluid transporters and/or one or more microfluidic channels. For instance, the fluid receiving device may include a chamber for collecting fluid withdrawn from a subject (e.g., for storage and/or later analysis), a chamber for containing a fluid for delivery to the subject (e.g., blood, saline, optionally containing drugs, hormones, vitamins, pharmaceutical agents, or the like), etc. - In one aspect of the invention, the device may include a vacuum source. Vacuum (a pressure below ambient) may help facilitate fluid flow into the
opening 130 of the device, and/or may help draw skin into theopening 130 for contact with theflow activator 90, and/or may help facilitate fluid flow from theopening 130 to achamber 140. In some cases, the vacuum source may be one that is self-contained within the device, i.e., the device need not be connected to an external vacuum source (e.g., a house vacuum) during use of the device to withdraw blood or interstitial fluid from the skin and/or from beneath the skin. For example, as shown inFIG. 4 , in one set of embodiments, the vacuum source may include avacuum source 156 having a pressure less than ambient pressure before blood (or other fluid) is withdrawn into the device, i.e., thevacuum source 156 may be at a “negative pressure” (that is, negative relative to ambient pressure) or a “vacuum pressure” (or just having a “vacuum”). For example, if ambient pressure is at atmospheric pressure, the vacuum in the vacuum source may be at least about 50 mmHg, at least about 100 mmHg, at least about 150 mmHg, at least about 200 mmHg, at least about 250 mmHg, at least about 300 mmHg, at least about 350 mmHg, at least about 400 mmHg, at least about 450 mmHg, at least about 500 mmHg, at least 550 mmHg, at least 600 mmHg, at least 650 mmHg, at least about 700 mmHg, or at least about 750 mmHg, i.e., below the ambient atmospheric pressure. However, in other embodiments, it should be understood that other pressures may be used and/or that different methods may be used to produce other pressures (greater than or less than atmospheric pressure). As non-limiting examples, an external vacuum or a mechanical device may be used as the vacuum source. For example, the device may comprise an internal vacuum source, and/or be connectable to a vacuum source that is external to the device, such as a vacuum pump or an external (line) vacuum source. In some cases, vacuum may be created manually, e.g., by manipulating a syringe pump, a plunger, or the like, or the low pressure may be created mechanically or automatically, e.g., using a piston pump, a syringe, a bulb, a Venturi tube, manual (mouth) suction, etc., or the like. - Thus, in some cases, the device may be “pre-packaged” with a suitable vacuum source (e.g., a pre-evacuated vacuum source 156); for instance, in one embodiment, the device may be applied to the skin and activated in some fashion to create and/or access the vacuum source. In some embodiments, the self-contained vacuum source may be actuated in some fashion to create a vacuum within the device. For instance, the self-contained vacuum source may include a piston, a syringe, a mechanical device such as a vacuum pump able to create a vacuum within the device, and/or chemicals or other reactants that can react to increase or decrease pressure which, with the assistance of mechanical or other means driven by the reaction, can form a pressure differential associated with a pressure regulator. Chemical reaction can also drive mechanical actuation with or without a change in pressure based on the chemical reaction itself. A self-contained vacuum source can also include an expandable foam, a shape memory material, or the like.
- In some cases, the device includes an interface 105 (see
FIGS. 2 , 4 and 5) that is able to help the device apply a vacuum to the skin and/or at theopening 130. Theinterface 105 may be, for example, a suction cup, a layer of a hydrogel material, such as Katecho 10G or other suitable hydrogel, or a circular bowl that is placed on the surface of the skin, and vacuum may be applied to the portion of skin exposed to thedevice 1 by theinterface 105. In one set of embodiments, the interface is part of a support structure, e.g., thebase 100. Theinterface 105 may be formed from any suitable material, e.g., glass, rubber, polymers such as silicone, polyurethane, nitrile rubber, EPDM rubber, neoprene, or the like. In some cases, the seal between theinterface 105 and the skin may be enhanced (e.g., reducing leakage), for instance, using vacuum grease, petroleum jelly, a gel, an adhesive or the like. In some cases, theinterface 105 may be relatively small, for example, having a diameter of less than about 5 cm, less than about 4 cm, less than about 3 cm, less than about 2 cm, less than about 1 cm, less than about 5 mm, less than about 4 mm, less than about 3 mm, less than about 2 mm, or less than about 1 mm. Theinterface 105 may be circular, although other shapes are also possible, for example, square, star-shaped (having 5, 6, 7, 8, 9, 10, 11, etc. points), tear-drop, oval, rectangular, or the like. In some embodiments, a portion of the interface 5 may extend across theopening 130, or at least a portion of theopening 130, and be arranged so that the flow activator 90 (e.g., one or more needles) passes through theinterface portion 105 before entering the skin. In this way, theflow activator 90 may not only open theinterface 105 to expose theopening 130 to the skin, but theinterface portion 105 through which the flow activator passes may carry a drug or other material to be delivered to the skin. For example, the interface portion penetrated by theflow activator 90 may include a drug-loaded matrix, such as a drug eluting hydrogel, arranged so that as needles pass through theinterface portion 105, the needles pick up material from the interface portion and carry the material into the skin. In other arrangements, theflow activator 90 may remain engaged with the skin after deployment through the interface portion and into the skin. In this way, the needles or other parts of theflow activator 90 may function as conduits or otherwise facilitate passage of the material into the skin, whether through channels or other flowpaths in or on the needles, dispersion through the needle material itself (e.g., in the case of a porous needle material), and so on. The needles may also be made dissolvable or otherwise degradable so that the needles help to maintain a flow pathway for drug or other material into the skin. Further, resorption of the needles may itself deliver drug or other material as is known in the art. - In some embodiments, vacuum from a vacuum source may facilitate the movement of blood or other fluids from an opening of a fluid transporter to a storage vessel. Alternately, pressure in a pressure source may help facilitate movement of drug or other material from a storage vessel to an opening of a fluid transporter and delivery to skin or other subject portion. In the
FIGS. 1-5 embodiment, vacuum may be stored in avacuum source 156, e.g., a majority of space enclosed by thecover 20 and thebase 100. Vacuum in thevacuum source 156 may be selectively coupled to thestorage chamber 140 so as to cause fluid at theopening 130 to be drawn into achannel 110 and to thechamber 140. For example, and as can be seen inFIG. 5 , one ormore channels 110 may be formed into the base 100 or otherwise provided between theopening 130 and thestorage chamber 140. Thechannel 110 may be covered at an upper side by a lower surface of achannel plate 80. In some embodiments, thechannel plate 80,membrane 72 andseal 76 could form a single part. (Additional configuration options for thechannel 110 are discussed below.) Thechannel plate 80 may not only help to define thechannel 110, but also define at least a portion of the cavity at thefluid transporter 120, part of thestorage chamber 140, avacuum inlet 154 and flowpath 150 used for control of flow between thevacuum source 156 and thestorage chamber 140, and a flow path between thechannel 110 and thestorage chamber 140. That is, as shown inFIGS. 4 and 10 , thechannel plate 80 helps to define a flow path between theopening 130 and thevacuum source 156 such that flow from theopening 130 may pass through thechannel 110 and to anopening 144 in thechannel plate 80 that connects thechannel 110 and thestorage chamber 140. Theopening 144 may include a filter, a hydrophobic element (e.g., to help prevent aqueous fluid in thestorage chamber 140 from later exiting the chamber 140), a one-way valve, or may be completely unobstructed. As can be seen inFIG. 10 , flow may also occur from thestorage chamber 140 through apassage 150 in thechannel plate 80 to thevacuum inlet 154. Thevacuum inlet 154 is normally closed by aseal 76, which may be part of themembrane 72, which also helps to isolate thevacuum source 156 from theopening 130 and other potential outlets for the low pressure in thevacuum source 156. As can be seen inFIG. 4 , theseal 76 is engaged with one of thelegs 48 of the retraction actuator 40 (a seal leg 49) so that when theretraction actuator 40 is in a compressed, initial state, theseal leg 49 presses theseal 76 into contact with thevacuum inlet 154 so as to close thepassage 150 and prevent communication between thevacuum source 156 and thestorage chamber 140. However, once theretraction actuator 40 is released, theseal leg 49 may move upwardly and/or the force of theseal leg 49 on theseal 76 may be reduced to a point at which thevacuum inlet 154 is open for flow from thestorage chamber 140 to thevacuum source 156. Thus, once theseal 76 opens thevacuum inlet 154, thevacuum source 156 may draw fluid (e.g., air and/or liquid) from thestorage chamber 140 so that fluid in thechannel 110 is drawn into thestorage chamber 140. Although not shown, a hydrophobic membrane or other suitable element may be provided at thevacuum inlet 154 or other suitable location (such as in the passage 150) to prevent liquid from flowing from thestorage chamber 140 into thevacuum source 156. As will be appreciated, if thevacuum source 156 is actually a positive pressure source, opening of theseal 76 may cause the delivery of material in thestorage chamber 140 to theflow activator 90, e.g., to effectively cause injection of the material into skin through needles of theflow activator 90. - In accordance with one aspect of the invention, fluid communication between the fluid transporter opening and the vacuum source may be enabled in response to actuation of the flow activator. For example, depression of the
device actuator 10 may permit communication between thevacuum source 156 and thestorage chamber 140/opening 130. While other arrangements are possible, in the illustrative embodiment ofFIGS. 1-10 , theseal 76 may be coupled to theseal leg 49 of theretraction actuator 40 so that once theflow activator 90 is actuated, e.g., deployment and retraction are initiated, theseal 76 may be released from thevacuum inlet 154 to permit fluid communication between thevacuum source 156 and thestorage chamber 140. This may allow a vacuum to be exerted on skin at theopening 130, causing the skin to be drawn toward and/or into theopening 130 prior to theflow activator 90 interaction with the skin. In some cases, it has been found that drawing skin into theopening 130 before needles of aflow activator 90 penetrate the skin has aided in the withdrawal of blood from the skin, whether in terms of speed and/or volume of blood drawn. Although in this embodiment, theseal leg 49 of theretraction actuator 40 moves away from the vacuum inlet 154 (or at least reduces a pressure on the seal 76) as theflow activator 90 is retracted, it is possible to arrange the opening of theseal 76 upon deployment of theflow activator 90 or at any other point in the movement of theflow activator 90, as well as before movement begins or after movement is completed. For example, flow between thevacuum source 156 and thestorage chamber 140 may be enabled by piercing a membrane or foil, e.g., with deployment of theflow activator 90 or upon full retraction of theflow activator 90. In one embodiment, a membrane seal could be located at theopening 130, and theflow activator 90 itself could serve to puncture the membrane, allowing flow from theopening 130 to thevacuum source 156. Thus, this puncture could serve to expose fluid at theopening 130 to vacuum to draw the fluid into astorage chamber 140. Of course, a membrane seal may be positioned at locations other than theopening 130, such as at thevacuum inlet 154, and a separate piercing element, such as a spike on therelease element 30, could be used to puncture the membrane. Other arrangements are possible as well, such as actuating a vacuum source (such as a chemical vacuum source or vacuum pump) in response to flow activator actuation. For example, theretraction actuator 40 may be coupled to a syringe piston so that as theretraction actuator 40 moves in the retraction direction, the piston is moved to generate suction at thestorage chamber 140. - As will be appreciated from the description above, in another aspect of the invention, the flow activator may be moved in a deployment direction to deploy the flow activator, and moved in a retraction direction to both retract the flow activator and enable fluid communication between the vacuum source and a fluid transporter opening. In the illustrative embodiment described above, the
seal 76 may be released from thevacuum inlet 154 as theflow activator 90 is retracted. Opening of the flow path at theseal 76 may occur at the start of retraction, during retraction, and/or after retraction is complete. In some embodiments, theseal 76 andflow activator 90 may be both moved in the same retraction direction by the retraction actuator. That is, during retraction, theflow activator 90 may be retracted and theseal 76 lifted to enable fluid communication between thevacuum source 156 and thedevice opening 130 through achannel 110. Theseal 76 may be formed from or otherwise include latex or other flexible material such as a thermoplastic elastomer (TPE) or polyurethane. In other embodiments, a force on theseal 76 may be sufficiently released to allow the relatively low pressure in thevacuum source 156 to cause flow from thestorage chamber 140 to thevacuum source 156 to occur. Thus, theseal 76 need not necessarily be lifted from thevacuum inlet 154, but instead may act as a kind of check valve with a desired crack pressure that permits flow from thestorage chamber 140 to thevacuum source 156 while a suitable pressure differential is present across theseal 76, but otherwise inhibits flow through theinlet 154. Other arrangements for opening fluid communication during retraction of the flow activator are possible, such as a spike on theretraction actuator 40 that pierces a membrane to open the fluid communication. In another embodiment, an electrical switch may be opened or closed by the retraction actuator, causing a vacuum source (such as a pump) to be activated. In another embodiment, movement of the retraction actuator may release a latch or other device, which allows a spring-loaded syringe piston or other device to move, creating a desired vacuum. In another embodiment, retraction movement of theretraction actuator 40 itself may move a syringe piston or other device to provide a desired vacuum. Thus, enabling of fluid communication between a vacuum source and a fluid transporter opening need not necessarily involve the opening of a valve or other device that blocks flow, but instead may involve the creation of suitable vacuum to cause flow. Other arrangements are possible as well. - In another aspect of the invention, an effector that deploys and/or retracts the flow activator may also enable fluid communication between the fluid transporter opening and the vacuum source. Providing a single component or assembly to both deploy and/or retract a flow activator as well as open fluid communication between a fluid transporter and vacuum source may, in some embodiments, provide for a fluid receiving device that is simpler in operation or construction. For example, a single device, such as a
retraction actuator 40 in theFIGS. 1-10 embodiment, may serve to both retract and open a flow path. This may reduce parts needed for construction of the fluid receiving device, reducing cost and/or assembly complexity. Of course, the effector need not necessarily perform both deployment and retraction functions, but instead may provide only deployment or retraction together with enabling fluid communication. For example, the effector may serve to only deploy a flow activator and enable fluid communication between the fluid transporter opening and vacuum source, e.g., in an embodiment where a flow activator is not retracted after deployment, but instead is permitted to remain embedded in skin to withdraw fluid as vacuum is applied to the flow activator. As discussed above, enabling of fluid communication between the fluid transporter opening and vacuum (or positive pressure) source may be provided in different ways, such as by opening a valve or similar structure (such as the seal 76), piercing a membrane, actuating a vacuum source (such as moving a syringe plunger or similar element), activating a chemically-operated vacuum source, and so on. - In another aspect of the invention, the flow activator and the vacuum seal may be attached together, e.g., as part of a single unitary structure or component. For example, as shown in
FIGS. 4 and 5 , theflow activator 90 may be attached to themembrane 72, e.g., by co-molding theflow activator 90 with the membrane, adhering theflow activator 90 to the membrane, etc., while theseal 76 is formed from part of themembrane 72 itself. Such an arrangement may ease assembly and reduce the number of components in thefluid receiving device 1. - As discussed above, flow enabled by movement of the
seal 76 may cause flow along thechannel 110 to thestorage chamber 140. Thechannel 110 may be formed, at least in part, by a single component, e.g. an etched substrate or molded unit such as thebase 100. The channel can have any cross-sectional shape, for example, circular, oval, triangular, irregular, square or rectangular (having any aspect ratio), or the like, and can be covered or uncovered (i.e., open to the external environment surrounding the channel). Thechannel 110 may be of any length. In some cases, thechannel 110 can be a simple two-dimensional opening that creates a fluidic coupling between theopening 130 and another vessel such as a vacuum source or a storage vessel. In these cases, the channel may not have any length at all (e.g., as in a two-dimensional opening). In embodiments where the channel is completely covered, at least one portion of the channel can have a cross-section that is completely enclosed, and/or the entire channel may be completely enclosed along its entire length with the exception of its inlet and outlet. - A channel may have any aspect ratio (length to average cross-sectional dimension), e.g., an aspect ratio of at least about 2:1, more typically at least about 3:1, at least about 5:1, at least about 10:1, etc. As used herein, a “cross-sectional dimension,” in reference to a fluidic or microfluidic channel, is measured in a direction generally perpendicular to fluid flow within the channel. A channel generally will include characteristics that facilitate control over fluid transport, e.g., structural characteristics and/or physical or chemical characteristics (hydrophobicity vs. hydrophilicity) and/or other characteristics that can exert a force (e.g., a containing force) on a fluid. The fluid within the channel may partially or completely fill the channel. In some cases the fluid may be held or confined within the channel or a portion of the channel in some fashion, for example, using surface tension (e.g., such that the fluid is held within the channel within a meniscus, such as a concave or convex meniscus). In an article or substrate, some (or all) of the channels may be of a particular size or less, for example, having a largest dimension perpendicular to fluid flow of less than about 5 mm, less than about 2 mm, less than about 1 mm, less than about 500 microns, less than about 200 microns, less than about 100 microns, less than about 60 microns, less than about 50 microns, less than about 40 microns, less than about 30 microns, less than about 25 microns, less than about 10 microns, less than about 3 microns, less than about 1 micron, less than about 300 nm, less than about 100 nm, less than about 30 nm, or less than about 10 nm or less in some cases. In one embodiment, the channel is a capillary.
- In one set of embodiments, the device may include a microfluidic channel. As used herein, “microfluidic,” “microscopic,” “microscale,” the “micro-” prefix (for example, as in “microchannel”), and the like generally refers to elements or articles having widths or diameters of less than about 1 mm, and less than about 100 microns (micrometers) in some cases. In some embodiments, larger channels may be used instead of, or in conjunction with, microfluidic channels for any of the embodiments discussed herein. For examples, channels having widths or diameters of less than about 10 mm, less than about 9 mm, less than about 8 mm, less than about 7 mm, less than about 6 mm, less than about 5 mm, less than about 4 mm, less than about 3 mm, or less than about 2 mm may be used in certain instances. In some cases, the element or article includes a channel through which a fluid can flow. In all embodiments, specified widths can be a smallest width (i.e. a width as specified where, at that location, the article can have a larger width in a different dimension), or a largest width (i.e. where, at that location, the article has a width that is no wider than as specified, but can have a length that is greater). Thus, for instance, the microfluidic channel may have an average cross-sectional dimension (e.g., perpendicular to the direction of flow of fluid in the microfluidic channel) of less than about 1 mm, less than about 500 microns, less than about 300 microns, or less than about 100 microns. In some cases, the microfluidic channel may have an average diameter of less than about 60 microns, less than about 50 microns, less than about 40 microns, less than about 30 microns, less than about 25 microns, less than about 10 microns, less than about 5 microns, less than about 3 microns, or less than about 1 micron.
- Fluids received from the skin and/or from beneath the skin of the subject will often contain various analytes within the body that are important for diagnostic purposes, for example, markers for various disease states, such as glucose (e.g., for diabetics); other example analytes include ions such as sodium, potassium, chloride, calcium, magnesium, and/or bicarbonate (e.g., to determine dehydration); gases such as carbon dioxide or oxygen; H+ (i.e., pH); metabolites such as urea, blood urea nitrogen or creatinine; hormones such as estradiol, estrone, progesterone, progestin, testosterone, androstenedione, etc. (e.g., to determine pregnancy, illicit drug use, or the like); or cholesterol. Other examples include insulin, or hormone levels. Still other analytes include, but not limited to, high-density lipoprotein (“HDL”), low-density lipoprotein (“LDL”), albumin, alanine transaminase (“ALT”), aspartate transaminase (“AST”), alkaline phosphatase (“ALP”), bilirubin, lactate dehydrogenase, etc. (e.g., for liver function tests); luteinizing hormone or beta-human chorionic gonadotrophin (hCG) (e.g., for fertility tests); prothrombin (e.g., for coagulation tests); troponin, BNT or B-type natriuretic peptide, etc., (e.g., as cardiac markers); infectious disease markers for the flu, respiratory syncytial virus or RSV, etc.; or the like.
- The
fluid receiving device 1 may include one or more sensors for detecting one more characteristics of a fluid received from a subject. The sensor(s) may be located in any suitable way or location with respect to the device, such as at thestorage chamber 140, at thechannel 110, on thecover 20, etc. For example, thedevice 1 may include a pH sensor, an optical sensor, an oxygen sensor, a sensor able to detect the concentration of a substance, or the like. Non-limiting examples of sensors useful in the invention include dye-based detection systems, affinity-based detection systems, microfabricated gravimetric analyzers, CCD cameras, optical detectors, optical microscopy systems, electrical systems, thermocouples and thermistors, pressure sensors, etc. Those of ordinary skill in the art will be able to identify other suitable sensors. The sensor can include a colorimetric detection system in some cases, which may be external to the device, or microfabricated into the device in certain cases. As an example of a colorimetric detection system, if a dye or a fluorescent entity is used (e.g. in a particle), the colorimetric detection system may be able to detect a change or shift in the frequency and/or intensity of the dye or fluorescent entity. - In one set of embodiments, the sensor may be a test strip, for example, test strips that can be obtained commercially. Examples of test strips include, but are not limited to, glucose test strips, urine test strips, pregnancy test strips, or the like. A test strip will typically include a band, piece, or strip of paper or other material and contain one or more regions able to determine an analyte, e.g., via binding of the analyte to a diagnostic agent or a reaction entity able to interact with and/or associate with the analyte. For example, the test strip may include various enzymes or antibodies, glucose oxidase and/or ferricyanide, or the like. The test strip may be able to determine, for example, glucose, cholesterol, creatinine, ketones, blood, protein, nitrite, pH, urobilinogen, bilirubin, leucocytes, luteinizing hormone, etc., depending on the type of test strip. The test strip may be used in any number of different ways. In some cases, a test strip may be obtained commercially and inserted into the device, e.g., before or after receiving blood, interstitial fluid, or other fluids from a subject. At least a portion of the blood or other fluid may be exposed to the test strip to determine an analyte, e.g., in embodiments where the device uses the test strip as a sensor so that the device itself determines the analyte. In some cases, the device may be sold with a test strip pre-loaded, or a user may need to insert a test strip in a device (and optionally, withdraw and replace the test strip between uses). In certain cases, the test strip may form an integral part of the device that is not removable by a user. In some embodiments, after exposure to the blood or other fluid withdrawn from the subject, the test strip may be removed from the device and determined externally, e.g., using other apparatuses able to determine the test strip, for example, commercially-available test strip readers.
- In some embodiments, the device may include a separation membrane that is impermeable to blood cells and other substances. Fluid received from the subject may flow through a separation membrane, and the received fluid may include components of various sizes. For example, the device may receive blood that includes blood cells, clotting factors, proteins, and blood plasma, among other components. Larger components such as blood cells and other larger substances may not be able to pass through the separation membrane while blood plasma is free to pass. In some embodiments, this blood plasma is collected into a storage chamber. If anticoagulant is not introduced to the blood plasma, the blood plasma, which contains clotting factors such as fibrinogen, may clot, thereby resulting in a solid clot component and a liquid component. This liquid component is known as serum, which is blood plasma without fibrinogen or other clotting factors. This serum can be collected via aspiration or other suitable method out of the storage chamber, leaving the blood clots in the storage chamber. If anticoagulant is introduced to the blood plasma, the blood plasma will not clot and blood plasma can be collected out of the storage chamber instead. Thus, the embodiments described throughout the specification may be used to produce plasma or serum. More details regarding plasma and serum production can be found in U.S. patent application Ser. No. 13/456,505, entitled “Plasma or Serum Production and Removal of Fluids Under Reduced Pressure,” published as U.S. Pat. Apl. Pub. No. 2012/0275955 on Nov. 1, 2012, incorporated herein by reference in its entirety.
- In some embodiments, the device may be connected to an external apparatus for determining at least a portion of the device, a fluid removed from the device, an analyte suspected of being present within the fluid, or the like. For example, the device may be connected to an external analytical apparatus, and fluid removed from the device for later analysis, or the fluid may be analyzed within the device in situ, e.g., by adding one or more reaction entities to the device, for instance, to a storage chamber, or to analytical chamber within the device. In some embodiments,
assay disks 200 or membranes may be included instorage chamber 140, as shown inFIG. 4 . In one embodiment, the external apparatus may have a port or other suitable surface for mating with a port or other suitable surface on the device, and blood, interstitial fluid, or other fluid can be removed from the device using any suitable technique, e.g., using vacuum or pressure, etc. The blood or other fluid may be removed by the external apparatus, and optionally, stored and/or analyzed in some fashion. For example, in one set of embodiments, the device may include an exit port for removing a fluid from the device (e.g., blood). In some embodiments, fluid contained within a storage chamber in the device may be removed from the device, and stored for later use or analyzed outside of the device. In some cases, the exit port may be separate from the fluid transporter. In some cases, an exit port can be in fluidic communication with a vacuum source, which can also serve as a fluid reservoir in some cases. Other methods for removing blood, interstitial fluid, or other fluids from the device include, but are not limited to, removal using a vacuum line, a pipette, extraction through a septum instead of an exit port, or the like. In some cases, the device may also be positioned in a centrifuge and subjected to various g forces (e.g., to a centripetal force of at least 50 g), e.g., to cause at separation of cells or other substances within a fluid within the device to occur. - The device may include an anticoagulant or a stabilizing agent for stabilizing the fluid withdrawn from the skin and/or beneath the skin. As a specific non-limiting example, an anticoagulant may be used for blood withdrawn from the skin. Examples of anticoagulants include, but are not limited to, heparin, citrate, thrombin, oxalate, ethylenediaminetetraacetic acid (EDTA), sodium polyanethol sulfonate, acid citrate dextrose. Other agents may be used in conjunction with or instead of anticoagulants, for example, stabilizing agents such as solvents, diluents, buffers, chelating agents, enzyme inhibitors (i.e., Protease or Nuclease inhibitor), antioxidants, binding agents, preservatives, antimicrobials, or the like. Examples of preservatives include, for example, benzalkonium chloride, chlorobutanol, parabens, or thimerosal. Non-limiting examples of antioxidants include ascorbic acid, glutathione, lipoic acid, uric acid, carotenes, alpha-tocopherol, ubiquinol, or enzymes such as catalase, superoxide dismutase, or peroxidases. Examples of microbials include, but are not limited to, ethanol or isopropyl alcohol, azides, or the like. Examples of chelating agents include, but are not limited to, ethylene glycol tetraacetic acid or ethylenediaminetetraacetic acid. Examples of buffers include phosphate buffers such as those known to ordinary skill in the art.
- In one set of embodiments, at least a portion of the device may be colored to indicate the anticoagulant(s) contained within the device. In some cases, the colors used may be identical or equivalent to that commercially used for Vacutamers™, Vacuettes™, or other commercially-available phlebotomy equipment. For example, lavender and/or purple may indicate ethylenediaminetetraacetic acid, light blue may indicate citrate, dark blue may indicate ethylenediaminetetraacetic acid, green may indicate heparin, gray may indicate a fluoride and/or an oxalate, orange may indicate a thrombin, yellow may indicate sodium polyanethol sulfonate and/or acid citrate dextrose, black may indicate citrate, brown may indicate heparin, etc. In other embodiments, however, other coloring systems may be used.
- Other coloring systems may be used in other embodiments of the invention, not necessarily indicative of anti-coagulants. For example, in one set of embodiments, the device carries a color indicative of a recommended bodily use site for the device, e.g., a first color indicative of a device suitable for placement on the back, a second color indicative of a device suitable for placement on a leg, a third color indicative of a device suitable for placement on the arm, etc.
- As mentioned, in one set of embodiments, a device of the invention as discussed herein may be shipped to another location for analysis. In some cases, the device may include an anticoagulant or a stabilizing agent contained within the device, e.g., within a storage chamber for the fluid. Thus, for example, fluid such as blood or interstitial fluid withdrawn from the skin and/or beneath the skin may be delivered to a chamber (e.g., a storage chamber) within the device, then the device, or a portion of the device (e.g., a module) may be shipped to another location for analysis. Any form of shipping may be used, e.g., via mail.
- Alternative embodiments that may incorporate one or more aspects of the invention are discussed further below.
- It should be understood that various components of a material delivery/receiving device may be modified in different ways, and that the embodiment discussed with respect to
FIGS. 1-10 should not be used to limit aspects of the invention. For example, in one alternative embodiment, theretraction actuator 40 of adevice 1 may include two separate elements.FIGS. 11-14 show an embodiment in which theretraction actuator 40 includes aretractor portion 42 and aseal actuator portion 44. As shown inFIGS. 11 and 12 , theretractor portion 42 and theseal actuator portion 44 are stacked and coupled to theeffector body 50 via fiveposts 52. Any number of posts may be used. Thepost 52 may be formed from or otherwise include Polyester (PCTA or PETG) or other polymer such as ABS, acetal resin, polystyrene, etc. Alternatively, theretractor portion 42 and theseal actuator portion 44 may be coupled to theeffector body 50 via a single post, glue, tape, other adhesive, etc.FIG. 12 shows that theretractor portion 42 includeslegs 48 that are free to flex relative to theeffector 50. Theseal actuator portion 44 includestabs 41 and theseal leg 49 that is coupled to theseal 76. Both theretractor portion 42 and aseal actuator portion 44 otherwise have essentially the same features as theretraction actuator 40 described above. By separating theretraction actuator 40 into two portions, each may be designed and constructed to have desired features. For example, in some embodiments it may be desirable to have thelegs 48 made of a highly elastic material, whereas thetabs 41 andseal leg 49 may be made of a less elastic material, e.g., to help release theseal 76 as theretraction actuator 40 moves upwardly. Additionally, as shown inFIG. 13 , themembrane 72 may be made independent from theseal 76, e.g., theseal 76 may be formed as part of theseal leg 49 of theactuator 40. In some embodiments, theflow activator 90 may be mechanically coupled to thedeployment actuator 60 via atransmission structure 94 such as a post, a rod, or other. As shown inFIG. 13 , apost 94 is coupled to themembrane 72, theflow activator 90 and thedeployment actuator 60, and may be made relatively stiff or non-compliant, e.g., to help transmit movement from thedeployment actuator 60 to theflow activator 90 with little loss. -
FIGS. 15-18 show yet another embodiment that is very similar to that ofFIGS. 1-10 , but in which the latch arrangement used to hold theretraction actuator 40 in an initial, compressed state is modified. In this illustrative embodiment, thedevice 1 contains arotatable release element 170 that rotates relative to the base 100 during operation of the device. (Therotatable release element 170 and corresponding portions of the base 100 replace therelease element 30 and thetabs 41 of theretraction actuator 40 of theFIGS. 1-10 embodiment.) Aspinner ramp 174 of therelease element 170 initially engages with a lock-out ramp 161 of aneffector guide 104 and holds therotatable release element 170 in place prior to actuation of thedevice 1.FIG. 16 shows a close-up of the initial engagement prior to actuation of thedevice 1. However, when therotatable release element 170 is moved toward the base 100 during device actuation (e.g., depression of the device actuator 10), therelease element 170 rotates slightly so that thespinner ramp 174 slides and clears the lock-out ramp 161 as therelease element 170 moves towards thebase 100. (Slight rotation of therelease element 170 may be caused by a ramp or other angled surface on theelement 170 contacting a corresponding ramp or other surface of the base 100 so that downward movement of therelease element 170 upon actuation of thedevice actuator 10 causes the desired rotation.) Thereafter, when pressure on therelease element 170 is released by the user, thespinner release ramp 175 engages thebase release ramp 160 as therelease element 170 moves upward so that as therotatable release element 170 rotates so that thespinner release ramp 175 clears thebase release ramp 160. This may allow theretraction actuator 40 to retract, e.g., to retract theflow activator 90. - In yet other embodiments, a material delivery/
receiving device 10 may be arranged in other ways, as suggested above. For example, in one embodiment shown inFIGS. 19-25 , afluid receiving device 1 includes a horizontally slidingtrigger 304 that can be actuated by a user or other by finger depression. Similar to the embodiments described above and as shown inFIGS. 19 and 20 , thedevice 1 includes acover 20 and abase 100, and fluid received at anopening 130 of afluid transporter 120 may be conducted by achannel 110 to a storage chamber 140 (not shown).FIGS. 21 and 22 show internal components of thedevice 1. An O-ring seal 340 may be located on atrigger shaft 306 of thetrigger 304. In another embodiment, a deformable membrane could form the seal. During use, sliding thetrigger 304 rearwardly towards a trailingedge 102 of the base 100 causes thetrigger shaft 306 to push thetrigger pin 332 with a trigger pin cover 334 (seeFIG. 22 ). This motion causes acarriage 330 to slide rearwardly along guides 360 (SeeFIG. 21 ) on the base 100 toward the trailingend 102 of thebase 100. Theguides 360 may be etched into thebase 100, may be protruded from thebase 100, or have any other suitable arrangement. - As the
carriage 330 moves rearwardly, atrigger bridge 336 connected to thecarriage 330 moves rearwardly relative to theeffector body 50. The underside of thetrigger bridge 336 includes atrigger tab 338, as can be seen inFIGS. 23A and 23B . Thetrigger tab 338 engages with a protrusion 339 (seeFIG. 24 ) on the top of theeffector body 50 so that as thetrigger bridge 336 moves rearwardly, thetrigger tab 338 moves theeffector body 50 downwardly a sufficient amount to actuate adeployment actuator 60, which has a configuration like that in the embodiments described above. This causes thedeployment actuator 60 to deploy theflow activator 90, e.g., to extend needles from theopening 130. Continued movement of thecarriage 330 in the rearward direction causes a retraction actuator of the trigger (in the form of wedges 350) to slide beneath lifting struts 370 on theeffector body 50. As thewedges 350 slide beneath the lifting struts 370, theeffector 50 is lifted upwardly away frombase 100, thereby retracting theflow activator 90, which is attached to theeffector body 50 via thedeployment actuator 60, andmembrane 72 in a way similar to the embodiments above. Thetrigger tab 338 may be received in anopening 380 in theeffector body 50, allowing a central portion of theeffector body 50 to flex upwardly and allowing further retraction of theflow activator 90. - Connection of a flow actuator to a deployment actuator may be done in a variety of different ways, as suggested above. For example,
FIG. 26A shows a schematic arrangement in which apost 94 used to connect a flow activator (not shown) to amembrane 72 and/or adeployment actuator 60 may be made by an adhesive 400. In another embodiment shown inFIG. 26B , thepost 94 may be received into a cavity (or hole) in themembrane 72 as well as a hole in thedeployment actuator 60. Engagement of thepost 94 with the respective holes or cavities may be made in any suitable way, such as by interference or friction fit, adhesive, riveting, and so on. In this embodiment, thepost 94 is engaged with a cavity of themembrane 72 by an adhesive 400 and has a rivet-type head that engages with the hole in thedeployment actuator 60. The rivet head of thepost 94 may be formed by plastically deforming part of thepost 94, or thepost 94 may include a flexible material arranged so that an upper portion of the rivet head may be resiliently deformed and forced through the hole of theactuator 60.FIG. 26C shows yet another embodiment in which amembrane 72 is joined to a deployment actuator by extending a portion of themembrane 72 through an opening in theactuator 60 and crimping or otherwise deforming the portion of themembrane 72 that extends through the opening. Alternately, a clip, band or other element may be clamped onto the membrane portion to maintain engagement of the membrane andactuator 60. Thepost 94 may be attached to both the membrane and actuator as part of the same process, e.g., part of the post may function as a clip or band.FIG. 26D shows an embodiment with a twopart post 94 where themembrane 72 is trapped between the two parts of the post. The top part of the post extends through a hole in thedeployment actuator 60 or is heat staked to create an interference fit between the post and thedeployment actuator 60. A portion of thepost 94 may be forced through an opening at the connection point, and thereby be engaged with thedeployment actuator 60. - Further details regarding optional arrangements for needles, which may be included as part of a flow activator, are provided below.
- As mentioned above, needles included with a flow activator may be arranged in a variety of different ways, depending on the intended application. For example, the needle(s) may have a length of less than about 5 mm, less than about 4 mm, less than about 3 mm, less than about 2 mm, less than about 1 mm, less than about 800 micrometers, less than 600 micrometers, less than 500 micrometers, less than 400 micrometers, less than about 300 micrometers, less than about 200 micrometers, less than about 175 micrometers, less than about 150 micrometers, less than about 125 micrometers, less than about 100 micrometers, less than about 75 micrometers, less than about 50 micrometers, less than about 10 micrometers, etc. The needle(s) may also have a largest cross-sectional dimension of less than about 5 mm, less than about 4 mm, less than about 3 mm, less than about 2 mm, less than about 1 mm, less than about 800 micrometers, less than 600 micrometers, less than 500 micrometers, less than 400 micrometers, less than about 300 micrometers, less than about 200 micrometers, less than about 175 micrometers, less than about 150 micrometers, less than about 125 micrometers, less than about 100 micrometers, less than about 75 micrometers, less than about 50 micrometers, less than about 10 micrometers, etc. For example, in one embodiment, the needle(s) may have a rectangular cross section having dimensions of 175 micrometers by 50 micrometers. In one set of embodiments, the needle(s) may have an aspect ratio of length to largest cross-sectional dimension of at least about 2:1, at least about 3:1, at least about 4:1, at least 5:1, at least about 7:1, at least about 10:1, at least about 15:1, at least about 20:1, at least about 25:1, at least about 30:1, etc.
- In one embodiment, the needle(s) is(are) a microneedle(s). Typically, a microneedle will have an average cross-sectional dimension (e.g., diameter) of less than about a millimeter. It should be understood that references to “needle” or “microneedle” as discussed herein are by way of example and ease of presentation only, and that in other embodiments, more than one needle and/or microneedle may be present in any of the descriptions herein.
- As an example, microneedles such as those disclosed in U.S. Pat. No. 6,334,856, issued Jan. 1, 2002, entitled “Microneedle Devices and Methods of Manufacture and Use Thereof,” by Allen, et al., may be used to deliver to and/or withdraw fluids (or other materials) from a subject. The microneedles may be hollow or solid, and may be formed from any suitable material, e.g., metals, ceramics, semiconductors, organics, polymers, and/or composites. Examples include, but are not limited to, medical grade stainless steel, titanium, nickel, iron, gold, tin, chromium, copper, alloys of these or other metals, silicon, silicon dioxide, and polymers, including polymers of hydroxy acids such as lactic acid and glycolic acid polylactide, polyglycolide, polylactide-co-glycolide, and copolymers with polyethylene glycol, polyanhydrides, polyorthoesters, polyurethanes, polybutyric acid, polyvaleric acid, polylactide-co-caprolactone, polycarbonate, polymethacrylic acid, polyethylenevinyl acetate, polytetrafluorethylene, polymethyl methacrylate, polyacrylic acid, or polyesters.
- In some cases, more than one needle or microneedle may be used. For example, arrays of needles or microneedles may be used, and the needles or microneedles may be arranged in the array in any suitable configuration, e.g., periodic, random, etc. In some cases, the array may have 3 or more, 4 or more, 5 or more, 6 or more, 10 or more, 15 or more, 20 or more, 35 or more, 50 or more, 100 or more, or any other suitable number of needles or microneedles. Typically, a microneedle will have an average cross-sectional dimension (e.g., diameter) of less than about a micron.
- Those of ordinary skill in the art can arrange needles relative to the skin or other surface for these purposes including, in one embodiment, introducing needles into the skin at an angle, relative to the skin's surface, other than 90°, i.e., to introduce a needle or needles into the skin in a slanting fashion so as to limit the depth of penetration. In another embodiment, however, the needles may enter the skin or other surface at approximately 90°.
- In some cases, the needles (or microneedles) may be present in an array selected such that the density of needles within the array is between about 0.5 needles/mm2 and about 10 needles/mm2, and in some cases, the density may be between about 0.6 needles/mm2 and about 5 needles/mm2, between about 0.8 needles/mm2 and about 3 needles/mm2, between about 1 needles/mm2 and about 2.5 needles/mm2, or the like. In some cases, the needles may be positioned within the array such that no two needles are closer than about 1 mm, about 0.9 mm, about 0.8 mm, about 0.7 mm, about 0.6 mm, about 0.5 mm, about 0.4 mm, about 0.3 mm, about 0.2 mm, about 0.1 mm, about 0.05 mm, about 0.03 mm, about 0.01 mm, etc.
- In another set of embodiments, the needles (or microneedles) may be chosen such that the area of the needles (determined by determining the area of penetration or perforation on the surface of the skin of the subject by the needles) allows for adequate flow of fluid to or from the skin and/or beneath the skin of the subject. The needles may be chosen to have smaller or larger areas (or smaller or large diameters), so long as the area of contact for the needles to the skin is sufficient to allow adequate blood flow from the skin of the subject to the device. For example, in certain embodiments, the needles may be selected to have a combined skin-penetration area of at least about 500 nm2, at least about 1,000 nm2, at least about 3,000 nm2, at least about 10,000 nm2, at least about 30,000 nm2, at least about 100,000 nm2, at least about 300,000 nm2, at least about 1 microns2, at least about 3 microns2, at least about 10 microns2, at least about 30 microns2, at least about 100 microns2, at least about 300 microns2, at least about 500 microns2, at least about 1,000 microns2, at least about 2,000 microns2, at least about 2,500 microns2, at least about 3,000 microns2, at least about 5,000 microns2, at least about 8,000 microns2, at least about 10,000 microns2, at least about 35,000 microns2, at least about 100,000 microns2, at least about 300,000 microns2, at least about 500,000 microns2, at least about 800,000 microns2, at least about 8,000,000 microns2, etc., depending on the application.
- The needles or microneedles may have any suitable length, and the length may be, in some cases, dependent on the application. For example, needles designed to only penetrate the epidermis may be shorter than needles designed to also penetrate the dermis, or to extend beneath the dermis or the skin. In certain embodiments, the needles or microneedles may have a maximum penetration into the skin of no more than about 3 mm, no more than about 2 mm, no more than about 1.75 mm, no more than about 1.5 mm, no more than about 1.25 mm, no more than about 1 mm, no more than about 900 microns, no more than about 800 microns, no more than about 750 microns, no more than about 600 microns, no more than about 500 microns, no more than about 400 microns, no more than about 300 microns, no more than about 200 microns, no more than about 175 micrometers, no more than about 150 micrometers, no more than about 125 micrometers, no more than about 100 micrometers, no more than about 75 micrometers, no more than about 50 micrometers, etc. In certain embodiments, the needles or microneedles may be selected so as to have a maximum penetration into the skin of at least about 50 micrometers, at least about 100 micrometers, at least about 300 micrometers, at least about 500 micrometers, at least about 1 mm, at least about 2 mm, at least about 3 mm, etc.
- In one set of embodiments, the needles (or microneedles) may be coated. For example, the needles may be coated with a substance that is delivered when the needles are inserted into the skin. For instance, the coating may comprise heparin, an anticoagulant, an anti-inflammatory compound, an analgesic, an anti-histamine compound, etc. to assist with the flow of blood from the skin of the subject, or the coating may comprise a drug or other therapeutic agent such as those described herein. The drug or other therapeutic agent may be one used for localized delivery (e.g., of or proximate the region to which the coated needles or microneedles are applied), and/or the drug or other therapeutic agent may be one intended for systemic delivery within the subject.
-
FIG. 27 shows an illustrative embodiment of a material delivery/receiving device 1 that is arranged to deliver a drug or other material to a user's skin. In this illustrative embodiment, thedevice 1 is arranged as a relatively low profile assembly, having a total height of about 10 mm or less and a diameter of 50 mm or less. Of course, other dimensions may be used for the height and diameter of thedevice 1. Thedevice 1 may be deployed as a patch or other similar arrangement, e.g., where theinterface 105 includes an adhesive so that thedevice 1 can be adhered to a user's skin.FIG. 28 shows perspective views of two possible arrangements for adevice 1, one with a circular shape, the other with a circular central portion and two tabs extending outwardly, e.g., in a way similar to some adhesive bandage arrangements. After adhering thedevice 1 to a user's skin or other body part, adevice actuator 10 may be depressed or otherwise actuated to cause thedevice 1 to deliver drug or other material to the skin. In this embodiment, depression of theactuator 10 causes an effector 50 (which may include a snap dome actuator like that discussed above) to deploy a flow activator 90 (e.g., including a plurality of needles) to move downwardly toward the user's skin. In their downward movement, the needles or other components of theflow activator 90 may penetrate aportion 105 a of theinterface 105 that is positioned at anopening 130 of thedevice 1. After penetrating theportion 105 a, the needles or other components may penetrate the user's skin. Theinterface portion 105 a may be arranged in any suitable way, but in this embodiment may include a drug eluting hydrogel or other material that is arranged to deliver a drug or other material to the needles or other flow activator components. The material(s) included in aninterface portion 105 a may be, for example, an absorbent material, a sponge, gauze, a swab, a membrane, a filter, a pad, or the like, and may depend on the drug or other material to be delivered. For example, needles passing through theactivator portion 105 a may pick up drug from theportion 105 a, and carry the drug into the skin. In other arrangements, drug or other material may be delivered to the needles or otherwise to the skin on an extended basis. For example, the needles may remain deployed in the skin after activation, and drug may be carried from theportion 105 a to the skin by the needles. Alternately, openings in the skin formed by the needles (whether the needles are withdrawn or not) may provide a pathway for the drug or other material to move from theportion 105 a to the skin, e.g., by diffusion or other transport. As discussed above, the needles may be hollow, include surface flow channels, be porous, be resorbable, or otherwise configured to aid in the delivery of material to the skin. Thus, the device may remain in place on a user for minutes, hours, days, months, etc. - Also, the
device 1 may include other features to help with drug or other material delivery, such as a positive pressure reservoir that opens or otherwise helps deliver a drug or other material to the skin. For example, theportion 105 a could include an impermeable membrane that is pierced by theflow activator 90. A positive pressure may be held inside the device 1 (e.g., in the space under the cover 20), and piercing of the membrane may allow the positive internal pressure to push drug or other material carried by theportion 105 a toward the skin. In other arrangements discussed above, thedevice 1 may include a drug or other material reservoir that is fluidly coupled to theopening 130, e.g., by a conduit that is fluidly coupled to theflow activator 90 which may include a plurality of hollow needles. Activation of the device may expose the reservoir to a positive pressure, which drives the drug or other material to/through the needles and into the skin. - Drug or other material delivery could be coupled with blood or other material withdrawal from the skin or other user body portion. For example, a flow activator may be deployed to pierce the skin and cause withdrawal of blood, e.g., due in part to exposure to a vacuum. The received blood may be conducted to a storage chamber, an absorbent pad or other material, etc. Thereafter (or simultaneous therewith), a drug or other material may be delivered in a manner like that described above or otherwise. For example, a
portion 105 a of aninterface 105 may carry a blood-thinning agent, pain-reducer or other component to aid in blood removal, pain reduction, or other aspect of blood reception. By passing through theportion 105 a, needles or other flow activator components may pickup the drug and deliver the drug upon penetration into the skin. Drug or other material may continue to be delivered, with different drugs or other materials being delivered at different times in the use of the device. For example, some drugs or other material may be encapsulated in a material that dissolves and releases the drug after being exposed to blood. In this way, the drug may be delivered only after having been exposed to blood for a period of time. This may allow for the collection of a drug-free blood sample, followed by delivery of the drug. For example, in one embodiment, a blood sample may be taken by the device for use in determining a glucose level of the user. Thereafter, insulin or other suitable drug may be delivered by the device, possibly in an amount dependent on the glucose level determined. Thedevice 1 may include some sort of indicator that drug or other material has been delivered. For example, a color change material may change its color indication to indicate that the drug has been delivered, e.g., based on exposure of the material to blood, passage of the drug to the flow activator, etc. - In some cases, the device may be an electrical and/or a mechanical device applicable or affixable to the surface of the skin, e.g., using adhesive, or other techniques such as those described herein. For example, in one set of embodiments, the device may include a support structure that contains an adhesive that can be used to immobilize the device to the skin. The adhesive may be permanent or temporary, and may be used to affix the device to the surface of the skin. The adhesive may be any suitable adhesive, for example, a pressure sensitive adhesive, a contact adhesive, a permanent adhesive, a cyanoacrylate, glue, gum, hot melts, an epoxy, a hydrogel, a hydrocolloid, or the like. In some cases, the adhesive is chosen to be biocompatible or hypoallergenic.
- In another set of embodiments, the device may be mechanically held to the skin, For example, the device may include mechanical elements such as straps, belts, buckles, strings, ties, elastic bands, or the like. For example, a strap may be worn around the device to hold the device in place against the skin of the subject. In yet another set of embodiments, a combination of these and/or other techniques may be used. As one non-limiting example, the device may be affixed to a subject's arm or leg using adhesive and a strap.
- Any or all of the arrangements described herein can be provided proximate a subject, for example on or proximate the skin of the subject, in various aspects. Activation of the devices can be carried out in a variety of ways, e.g., as described herein. For example, an on-skin device can be in the form of a patch or the like, optionally including multiple layers for activation, sensing, fluid flow, etc. In one embodiment, a patch or a device can be applied to a subject and a region of the patch or device activated (e.g., pushed, pressed, or tapped by a user) to inject a needle or a microneedle, or other fluid transporter, so as to access interstitial fluid or blood. The same or a different activation action, e.g., tapping or pushing action, can activate a vacuum source, open and/or close one or more of a variety of valves, or the like. The device can be a simple one in which it is applied to the skin and operates automatically (where e.g., application to the skin of the device allows access to interstitial fluid or blood, and delivers and/or withdraws fluid) or the patch or other device can be applied to the skin and one tapping or other activation action can cause fluid to flow through administration of a needle or a microneedle (or other fluid transporter), opening of a valve, activation of vacuum, etc., or any combination thereof. Any number of activation protocols can be carried out by a user repeatedly pushing, tapping, etc. a location or selectively, sequentially, and/or periodically activating a variety of switches (e.g., tapping regions of a patch or device).
- As mentioned, the device may include an anticoagulant or a stabilizing agent for stabilizing the fluid withdrawn from the skin. As a specific non-limiting example, an anticoagulant may be used for blood withdrawn from the skin. Examples of anticoagulants include, but are not limited to, heparin, citrate, oxalate, or ethylenediaminetetraacetic acid (EDTA). Other agents may be used in conjunction or instead of anticoagulants, for example, stabilizing agents such as solvents, diluents, buffers, chelating agents, antioxidants, binding agents, preservatives, antimicrobials, or the like. Examples of preservatives include, for example, benzalkonium chloride, chlorobutanol, parabens, or thimerosal. Non-limiting examples of antioxidants include ascorbic acid, glutathione, lipoic acid, uric acid, carotenes, alpha-tocopherol, ubiquinol, or enzymes such as catalase, superoxide dismutase, or peroxidases. Examples of microbials include, but are not limited to, ethanol or isopropyl alcohol, azides, or the like. Examples of chelating agents include, but are not limited to, ethylene glycol tetraacetic acid or ethylenediaminetetraacetic acid. Examples of buffers include phosphate buffers such as those known to ordinary skill in the art.
- As yet another example, the device may include a therapeutic agent such as an anti-inflammatory compound, an analgesic, or an anti-histamine compound. Examples of anti-inflammatory compounds include, but are not limited to, NSAIDs (non-steroidal anti-inflammatory drugs) such as aspirin, ibuprofen, or naproxen. Examples of analgesics include, but are not limited to, benzocaine, butamben, dibucaine, lidocaine, oxybuprocaine, pramoxine, proparacaine, proxymetacaine, tetracaine, acetaminophen, NSAIDs such as acetylsalicylic acid, salicylic acid, diclofenac, ibuprofen, etc., or opioid drugs such as morphine or opium, etc. Examples of anti-histamine compounds include, but are not limited to, clemastine, diphenhydramine, doxylamine, loratadine, desloratadine, fexofenadine, pheniramine, cetirizine, ebastine, promethazine, chlorpheniramine, levocetirizine, olopatadine, quetiapine, meclizine, dimenhydrinate, embramine, dimethindene, dexchlorpheniramine, vitamin C, cimetidine, famotidine, ranitidine, nizatidine, roxatidine, or lafutidine. Other specific non-limiting examples of therapeutic agents that could be used include, but are not limited to biological agents such as erythropoietin (“EPO”), alpha-interferon, beta-interferon, gamma-interferon, insulin, morphine or other pain medications, antibodies such as monoclonal antibodies, or the like. In short, the type of drug(s) or other material(s) delivered by the
device 1 need not be limited in any particular way or method of delivery. - U.S. Provisional Patent Application Ser. No. 61/577,399, filed Dec. 19, 2011, entitled “Delivering and/or Receiving Material with Respect to a Subject Surface,” by Bernstein, et al., is incorporated herein by reference in its entirety. In addition, each of the following is incorporated herein by reference in its entirety: U.S. patent application Ser. No. 12/716,229, filed Mar. 2, 2010; U.S. patent application Ser. No. 12/716,226, filed Mar. 2, 2010; U.S. patent application Ser. No. 12/915,735, filed Oct. 29, 2010; U.S. patent application Ser. No. 12/915,789, filed Oct. 29, 2010; U.S. patent application Ser. No. 12/915,820, filed Oct. 29, 2010; U.S. patent application Ser. No. 12/953,744, filed Nov. 24, 2010; U.S. patent application Ser. No. 13/006,165, filed Jan. 13, 2011; U.S. patent application Ser. No. 13/006,177, filed Jan. 13, 2011; U.S. patent application Ser. No. 13/016,575, filed Jan. 28, 2011; PCT Apl. No. PCT/US2011/043698, filed Jul. 12, 2011; PCT Apl. No. PCT/US2011/047565, filed Aug. 12, 2011; U.S. patent application Ser. No. 13/456,570, filed Apr. 26, 2012; U.S. patent application Ser. No. 13/456,394, filed Apr. 26, 2012; U.S. patent application Ser. No. 13/456,505, filed Apr. 26, 2012; U.S. patent application Ser. No. 13/456,546, filed Apr. 26, 2012; and U.S. Prov. Pat. Apl. Ser. No. 61/577,399, filed Dec. 19, 2011.
- While aspects of the invention have been described with reference to various illustrative embodiments, such aspects are not limited to the embodiments described. Thus, it is evident that many alternatives, modifications, and variations of the embodiments described will be apparent to those skilled in the art. Accordingly, embodiments as set forth herein are intended to be illustrative, not limiting. Various changes may be made without departing from the spirit of aspects of the invention.
Claims (7)
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US20170281852A1 (en) | 2017-10-05 |
US20200353155A1 (en) | 2020-11-12 |
US10543310B2 (en) | 2020-01-28 |
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