Adaptive syringe plunger

Abstract

An adaptive syringe plunger assembly includes a syringe and a plurality of syringe interface devices each removably coupled to the syringe. Each of the plurality of syringe interface devices increases a surface area for a syringe user to force the syringe to apply the syringe.

Description

[0001] Cross-referencing related applications

[0002] This application claims priority to U.S. Provisional Application No. 63 / 543,134, filed on October 9, 2023, the entire disclosure of which is incorporated herein by reference. Background Technology

[0003] This disclosure relates to a syringe, and more particularly to an adaptive syringe plunger. More specifically, this disclosure relates to a syringe interface device configured for detachable connection to a syringe plunger.

[0004] Typically, syringe plungers have small, rounded ends. Syringe users, such as clinicians and home caregivers, press the small, rounded end of the plunger firmly with their thumbs. Clinicians and individuals with limited thumb dexterity or restricted thumb movement may find it difficult to administer medication using this type of syringe. Therefore, syringe users would prefer a plunger with a larger force-applying surface area. Summary of the Invention

[0005] An apparatus, system, or method may include one or more features as set forth in the appended claims and / or features that may individually or in any combination below include patentable subject matter.

[0006] According to this disclosure, an adaptive syringe plunger assembly can be provided. The adaptive syringe plunger assembly may include a syringe and a plurality of syringe interface devices. The syringe may be configured to eject fluid. The syringe may include a syringe body and a plunger, the plunger being at least partially housed within the syringe body and sliding along a plunger axis. The plunger may have a first end disposed within the syringe body and a second end disposed outside the syringe body opposite to the first end. A plurality of syringe interface devices may each be detachably coupled to the second end of the plunger. The plurality of syringe interface devices may be configured to receive force applied by a syringe user to cause the plunger to slide within the syringe body and eject fluid from the syringe body. Each of the plurality of syringe interface devices may increase the surface area for the syringe user to apply force to a corresponding syringe interface device coupled to the second end of the plunger. Each of the plurality of syringe interface devices may have a different shape.

[0007] Optionally, at least one of the plurality of syringe interface devices may include a body and an attachment rod, the attachment rod being formed to include a hole for receiving a second end of a plunger. The body includes a top wall and a bottom wall opposite the top wall. The attachment rod can extend downward from the bottom wall of the body and can be aligned with the plunger axis. The body of at least one of the plurality of syringe interface devices may be triangular, with its three rounded corners circumferentially spaced from each other relative to the plunger axis. The top wall of the body may be curved downward toward the attachment rod at each of the three rounded corners, such that the apex of the body can be aligned with the plunger axis.

[0008] Alternatively, at least one of the plurality of syringe interface devices may have a conical body. The apex of the body may be aligned with the plunger axis, and the top wall may extend downward from the apex.

[0009] If necessary, the body of at least one of the multiple syringe interface devices may be cylindrical. The top wall of the body is substantially flat. The body may include sidewalls extending between and interconnecting the top and bottom walls. The sidewalls may be radially inward toward the plunger axis to form recesses sized to accommodate the syringe user's fingers.

[0010] Alternatively, the bottom wall may have a first end and a second end opposite to the first end. The top wall may extend upward from the first and second ends of the bottom wall and may be connected to the first and second ends of the bottom wall to form a finger-receiving area between the top wall and the bottom wall.

[0011] Additionally, the body may include sidewalls extending between the top and bottom walls of the body and interconnecting the top and bottom walls. At least a portion of the sidewalls may be formed to include finger-receiving grooves sized to accommodate the fingers of a syringe user.

[0012] Optionally, the hole in the attachment rod of at least one of the plurality of syringe interface devices may be formed to include a thread that mates with a second end of the plunger, so that at least one of the plurality of syringe interface devices is detachably connected to the plunger.

[0013] Alternatively, at least a portion of the attachment rod may be formed of an elastomeric material. The elastomeric material may be configured to deform so that at least one of the plurality of syringe interface devices is detachably connected to the plunger.

[0014] Alternatively, the attachment rod may be formed including a first attachment portion and a second attachment portion. The first attachment portion may have a tab extending radially from the first attachment portion into a tab receiving opening formed in the second attachment portion to connect the first attachment portion and the second attachment portion together. The first and second attachment portions of the attachment rod may cooperate to form a hole for receiving a plunger. The first and second attachment portions are detachably connected together so that at least one of a plurality of syringe interface devices is detachably connected to the plunger.

[0015] Additionally, at least one of the plurality of syringe interface devices may include a hook and loop fastener formed to include a slit extending therethrough and sized to accommodate a second end of the plunger, so that at least one of the plurality of syringe interface devices may be detachably coupled to the plunger.

[0016] If necessary, at least one of the plurality of syringe interface devices may include a body and an attachment rod, the attachment rod being configured to receive a second end of a plunger. The body includes a top wall and a bottom wall opposite the top wall. The attachment rod can extend downward from the bottom wall of the body and can be aligned with the plunger axis. The bottom wall may have a first end and a second end opposite the first end. The top wall can extend upward from the first and second ends of the bottom wall and can be coupled to the first and second ends of the bottom wall to form a finger-receiving area between the top and bottom walls. The attachment rod may include a first attachment arm extending downward from the body and a second attachment arm extending downward from the body and radially spaced from the first attachment arm. Each of the first and second attachment arms may be configured to include a tab extending radially inward from the bottom edge of each of the first and second attachment arms. Each tab may be configured to snap onto a portion below the second end of the plunger, such that at least one of the plurality of syringe interface devices is detachably coupled to the plunger.

[0017] Optionally, at least one of the plurality of syringe interface devices may include a body, a first attachment arm extending downward from the body, and a second attachment arm extending downward from the body and radially spaced from the first attachment arm. A tensioning unit may extend around the first attachment arm, the second attachment arm, and the plunger to allow the plunger to be detachably coupled to at least one of the plurality of syringe interface devices.

[0018] Alternatively, at least one of the plurality of syringe interface devices may include a body, a first attachment arm extending downward from the body, and a second attachment arm extending downward from the body and radially spaced from the first attachment arm. The first and second attachment arms may be configured to wrap around a plunger so that at least one of the plurality of syringe interface devices is detachably coupled to the plunger.

[0019] If necessary, the plunger may include a plunger shaft extending between and interconnecting a first end and a second end of the plunger. The plunger shaft may have a first diameter. The second end of the plunger may be a thumb pad. The thumb pad may have a second diameter. The second diameter may be larger than the first diameter. At least one of a plurality of syringe interface devices may include a hollow body and an attachment rod extending downward from the hollow body. The third diameter of the attachment rod may be smaller than the second diameter of the thumb pad. The attachment rod may be configured to deform so that the thumb pad is received within the hollow body via the attachment rod.

[0020] According to this disclosure, an adaptive syringe plunger assembly can also be provided. The adaptive syringe plunger assembly may include a syringe and a syringe interface device. The syringe may be configured to eject fluid. The syringe may include a syringe body and a plunger, the plunger being at least partially housed within the syringe body for sliding along a plunger axis. The plunger may have a first end disposed within the syringe body and a second end disposed outside the syringe body opposite to the first end. The syringe interface device may be configured to be detachably coupled to the second end of the plunger to receive force from the user's palm, causing the plunger to slide within the syringe body and eject fluid from the syringe body. The syringe interface device may include a body and an attachment rod extending downward from the body for detachable coupling to the second end of the plunger. The syringe interface device may be configured to increase the surface area for the user to apply force to the syringe interface device.

[0021] Optionally, the attachment rod can be formed to include a hole sized to accommodate the plunger. The body can be formed to include a top wall and a bottom wall opposite the top wall. The attachment rod can extend downward from the bottom wall of the body and can be aligned with the plunger axis. The body can be triangular, with its three corners circumferentially spaced relative to the plunger axis. The top wall of the body can be bent downward at each of the three corners, such that the apex of the body can be aligned with the plunger axis.

[0022] Alternatively, the body can be conical. The apex of the body can be aligned with the piston axis. The top wall can extend downward from the apex.

[0023] If necessary, the body can be cylindrical, and the top wall of the body can be substantially flat. The body may include side walls extending between the top and bottom walls of the body and interconnecting the top and bottom walls. The side walls may be bent radially inward toward the plunger axis to form recesses sized to accommodate the syringe user's fingers.

[0024] Alternatively, the bottom wall may have a first end and a second end opposite to the first end. The top wall may extend upward from the first and second ends of the bottom wall to form a finger-receiving area between the top wall and the bottom wall.

[0025] Additionally, the body may include a sidewall extending between the top and bottom walls of the body and interconnecting the top and bottom walls. The sidewall may be formed to include a finger-receiving groove sized to accommodate the user's finger.

[0026] Alternatively, the hole in the attachment rod can be formed to include a thread that mates with the second end of the plunger so that the syringe interface device can be detachably connected to the plunger.

[0027] Alternatively, at least a portion of the attachment rod may be formed of an elastomeric material. The elastomeric material may be configured to deform to allow the syringe interface device to be detachably attached to the plunger.

[0028] Alternatively, the attachment rod can be formed including a first attachment portion and a second attachment portion. The first attachment portion may have a tab extending radially from the first attachment portion into a tab receiving opening formed in the second attachment portion to connect the first attachment portion and the second attachment portion together. The first and second attachment portions of the attachment rod can cooperate to form an orifice sized to receive a plunger. The first and second attachment portions can be coupled together to allow the syringe interface device to be detachably connected to the plunger.

[0029] Additionally, the attachment rod may include a first attachment arm extending downward from the body and a second attachment arm extending downward from the body and radially spaced from the first attachment arm. A tensioning unit may be wound around the first and second attachment arms to engage the first and second attachment arms with the plunger. The tensioning unit may be located radially outside the first and second attachment arms.

[0030] Optionally, the attachment rod may include a first attachment arm extending downward from the body and a second attachment arm extending downward from the body and radially spaced from the first attachment arm. The first and second attachment arms may be configured to wrap around the plunger to allow the syringe interface device to be detachably coupled to the plunger.

[0031] Additional features (including those listed above and / or those listed in the claims) may constitute patentable subject matter alone or in combination with any other features, and these additional features will become clear to those skilled in the art when they refer to the detailed description of exemplary embodiments of the preferred implementation of this disclosure. Attached Figure Description

[0032] The above and other features of the various methods and apparatus embodiments described herein will become clear from the following detailed description and accompanying drawings, in which:

[0033] Figure 1A The image shows a perspective view of an adaptive syringe plunger assembly, which includes a syringe and a syringe interface device configured for detachable connection to the syringe. The syringe interface device has a triangular body and an attachment rod extending downward from the body to connect to a plunger contained in the syringe.

[0034] Figure 1B for Figure 1A The exploded perspective view of the adaptive syringe plunger assembly shown illustrates that the syringe interface device provides a larger surface area than the plunger thumb pad for the syringe user to apply force when administering medication from the syringe. It also shows that the attachment rod is configured to deform when the plunger thumb pad is inserted into the attachment rod, and that the thumb pad is located inside the main body of the syringe interface device after insertion.

[0035] Figure 1C for Figure 1AA partial cross-sectional view of the adaptive syringe plunger assembly shows that after the plunger thumb pad is inserted into the attachment rod, the plunger thumb pad abuts against the bottom wall of the main body of the syringe interface device, so that the syringe interface device is held on the syringe.

[0036] Figure 2A A perspective view of another embodiment of a syringe interface device configured for detachable connection to a syringe, the syringe interface device having a conical body and an attachment rod extending downward from the body to a plunger;

[0037] Figure 2B for Figure 2A The exploded perspective view of the adaptive syringe plunger assembly shown indicates that the syringe interface device provides a larger surface area than the plunger thumb pad for the syringe user to apply force when administering medication from the syringe. It also shows that the attachment rod is threaded, allowing the syringe interface device to be screwed onto the plunger thumb pad to keep the syringe interface device on the syringe.

[0038] Figure 3A A perspective view of another embodiment of a syringe interface device configured for detachable connection to a syringe, the syringe interface device having a cylindrical body and an attachment rod extending downward from the body to a plunger;

[0039] Figure 3B for Figure 3A The bottom view of the syringe interface device shown shows that the attachment rod includes a first attachment portion and a second attachment portion that are snapped together around the plunger, with the tongue of the first attachment portion extending toward the second attachment portion to receive into a tongue receiving opening formed in the second attachment portion.

[0040] Figure 3C for Figure 3A The exploded perspective view of the syringe interface device shows the connection between the second attachment and the main body of the syringe interface device. It also shows that the first and second attachments are snapped together around the plunger, while the plunger thumb pad is inside the main body, so that the syringe interface device is held on the syringe.

[0041] Figure 4A for Figure 3A The front perspective view of the syringe interface device shows that the sidewall of the body is formed to include an opening for receiving a hook and loop fastener, which extends through the body and out of the opening formed on the opposite side of the sidewall. The hook and loop fastener is configured to wrap around the syringe user's hand to support the syringe user's hand relative to the syringe interface device during syringe administration.

[0042] Figure 4B for Figure 4A The side perspective view of the syringe interface device shows that the hook and loop fastener extends through the body and from two openings formed in the side wall of the body;

[0043] Figure 5A A perspective view of another embodiment of a syringe interface device configured for detachable attachment to a syringe, the syringe interface device having a cylindrical body and an attachment rod extending downward from the body and attached to a plunger, the cylindrical body being formed to include concave sidewalls sized to accommodate the syringe user's fingers for gripping, and also showing that the syringe interface device includes a tightening unit attached to the attachment rod and having a tightening head and a tightening line, the tightening unit tightening the attachment rod after the plunger thumb pad has been inserted into the attachment rod, so that the syringe interface device is held on the syringe;

[0044] Figure 5B for Figure 5A The perspective view of the syringe interface device shown illustrates the attachment rod connected to an alternative tightening unit, which has a tightening clamp and a fastener. The fastener is configured such that after the plunger thumb pad is inserted into the attachment rod, the tightening clamp is tightened around the attachment rod, thereby holding the syringe interface device on the syringe.

[0045] Figure 6 A perspective view of another embodiment of a syringe interface device configured for detachable connection to a syringe, wherein a finger-receiving area is formed between the curved top wall and the bottom wall of the syringe interface device, and the curved top wall is formed to include a finger-receiving groove for accommodating the user's finger.

[0046] Figure 7A A perspective view of another embodiment of a syringe interface device configured for detachable attachment to a syringe, the syringe interface device including a hook and loop fastener with a slit formed therein extending through the fastener and sized to accommodate a plunger thumb pad, such that the syringe interface device is held on the syringe, and also showing the hook and loop fastener configured to wrap around the syringe user's hand to support the syringe user's hand relative to the syringe interface device during syringe administration.

[0047] Figure 7B This is a top view of the syringe interface device, showing the plunger extending through a slit formed in the hook and loop tape to hold the syringe interface device on the syringe.

[0048] Figure 8A A perspective view of another embodiment of a syringe interface device configured for detachable attachment to a syringe, the syringe interface device having a body and an attachment rod extending downward from the body and attached to a plunger thumb pad, the body being formed as a handle including a finger-receiving groove sized to accommodate the user's finger, and the body being configured to... Figure 8A The vertical arrangement parallel to the plunger shown is... Figure 8B The horizontal configuration shown relative to the attachment rod also indicates that the syringe interface device includes a body adjustment joint, which is formed as a ball-and-socket joint and configured to allow the body to move between a vertical configuration and a horizontal configuration.

[0049] Figure 8B for Figure 8A The syringe interface device shown is in a horizontally configured perspective view, showing that the ball joint of the main body adjustment connector is connected to the ball socket of the main body adjustment connector and rotates within the ball socket to adjust the configuration of the main body relative to the plunger.

[0050] Figure 9 A perspective view of another embodiment of a syringe interface device configured for detachable connection to a syringe, the syringe interface device having a body formed as a handle and having a grip cavity thereon, and an attachment rod extending downward from the body and connected to a plunger. The syringe interface device also includes a first connector connected to the bottom surface of the attachment rod and a second connector connected to the top surface of the plunger thumb pad, the first connector and the second connector engaging with each other such that the syringe interface device is held on the syringe.

[0051] Figure 10 A perspective view of another embodiment of a syringe interface device configured for detachable connection to a syringe, the syringe interface device having a disc-shaped body and an attachment rod extending downward from the body to a plunger, the attachment rod including a first attachment arm and a second attachment arm each extending downward from opposite sides of the body.

[0052] Figure 11 for Figure 10 The perspective view of the syringe interface device connected to the plunger shows a first attachment arm and a second attachment arm configured to move inward toward the plunger. It also shows that the syringe interface device includes a tensioning unit that extends around the first and second attachment arms to engage the attachment arms with the plunger, thereby holding the syringe interface device on the syringe.

[0053] Figure 12 for Figure 10 The perspective view of the syringe interface device connected to the plunger shows that the first attachment arm and the second attachment arm are configured to wrap around the plunger so that the syringe interface device is held on the syringe. Detailed Implementation

[0054] This disclosure relates to an adaptive syringe plunger assembly 10 that increases the surface area on which a syringe user applies force when ejecting fluid from a syringe 12. Typically, a standard plunger has a small, rounded end, which the syringe user applies force to with their thumb. Individuals with limited thumb dexterity or restricted thumb movement may find it difficult to administer medication using such a syringe. Therefore, the small, rounded end of a standard plunger can cause difficulties for syringe users (such as clinicians and individuals using syringes in home treatment) when administering medication.

[0055] like Figure 1A and Figure 1BAs shown, the adaptive syringe plunger assembly 10 includes a syringe 12 and at least one syringe interface device 14. The syringe 12 is configured to eject fluid. Compared to a standard plunger, the syringe interface device 14 has a relatively larger surface area for the syringe user to apply force; therefore, because the force is distributed over a larger surface area, such as the palm of the hand, the pressure on the syringe user's fingers is less.

[0056] Figure 1A and Figure 1B In the example, syringe 12 is an EXACTAMED manufactured by Baxter International Inc. of Deerfield, Illinois, USA. TM Oral dispenser. Therefore, the syringe 12 has an open needle tip 31, which, during transport, is closed at the open end (not shown) by a needle tip cap 33. However, in other embodiments, instead of the needle tip 31, the syringe 12 may also include, for example, a needle or Luer lock for connection to an IV line or port.

[0057] like Figure 1A As shown, syringe 12 includes a syringe body 16 and a plunger 18 spaced radially inward from the syringe body 16 relative to a plunger axis 20. The syringe body 16 is hollow. The plunger 18 is at least partially housed within the syringe body 16 and slides within the syringe body 16 along the plunger axis 20. The plunger 18 has a plunger shaft 19, a first end 22, and a second end 24. The plunger shaft 19 extends between the first end 22 and the second end 24, interconnecting the first end 22 and the second end 24. The first end 22 of the plunger 18 is disposed within the syringe body 16. Figure 1B As shown, the second end 24 of the plunger 18 is opposite to the first end 22 and disposed outside the syringe body 16. As shown, the second end 24 of the plunger 18 includes a thumb pad 25. The first end 22 of the plunger 18 is configured as a piston, the seal of which slidably engages the inner surface of the syringe body 16.

[0058] like Figure 1A and Figure 1B As shown, when the syringe user applies force to the syringe interface device 14, the plunger 18 slides within the syringe body 16 until the first end 22 of the plunger 18 abuts against the bottom end 26 of the syringe body 16. The movement of the plunger 18 within the syringe body 16 causes fluid to be ejected from the syringe body 16. In some embodiments, the syringe 12 is used for oral liquid administration. In some embodiments, as described above, the syringe 12 includes a needle for injecting the fluid.

[0059] like Figure 1BAs shown, at least a portion of the plunger shaft 19 of the plunger 18 is disposed outside the syringe body 16. The portion of the plunger shaft 19 disposed outside the syringe body 16 has a first diameter D1. The second diameter D2 of the second end 24 (i.e., the thumb pad 25) of the plunger 18 is greater than the first diameter D1 of the plunger shaft 19.

[0060] Syringe interface device 14 can be coupled to the second end 24 of plunger 18, such that syringe interface device 14 can be attached, removed, and / or replaced with different syringe interface devices, such as one of syringe interface devices 214, 314, 414, 514, 614, 714, 814, and 914, as detailed below. Applying force to syringe interface device 14 by the syringe user, rather than directly to the second end 24 of plunger 18, distributes the force over a larger surface area. Figures 1A to 12 Different embodiments of syringe interface devices 14, 214, 314, 414, 514, 614, 714, 814, and 914 are shown. All syringe interface devices 14, 214, 314, 414, 514, 614, 714, 814, and 914 of this disclosure allow the force applied by the syringe user to be distributed over a larger surface area because the syringe user applies force to syringe interface devices 14, 214, 314, 414, 514, 614, 714, 814, and 914 rather than to the second end 24 of the plunger 18, thereby reducing the pressure on the syringe user's thumb. That is, syringe interface devices 14, 214, 314, 414, 514, 614, 714, 814, and 914 are all larger than the thumb pad 25, thereby enhancing the ability of syringe users with low manual dexterity to administer medication, for example, with syringe 12.

[0061] like Figure 1A and Figure 1B As shown, the syringe interface device 14 includes a main body 28 and an attachment rod 30. (As indicated...) Figure 1A and Figure 1C As shown, the body 28 is hollow, allowing it to accommodate the second end 24 of the plunger 18. An attachment rod 30 extends downward from the body 28 and is formed to include a hole 32 extending through the attachment rod 30 into the body 28. The hole 32 is aligned with the plunger axis 20.

[0062] like Figure 1BAs shown, the body 28 includes a top wall 34, a bottom wall 36, a first side wall 38, a second side wall 40, and a third side wall 42. A hollow space is defined between the top wall 34 and the bottom wall 36. An attachment rod 30 is connected to the bottom wall 36. The side walls 38, 40, and 42 extend between the top wall 34 and the bottom wall 36, interconnecting the top wall 34 and the bottom wall 36. As shown, the body 28 is generally triangular, with its three rounded corners circumferentially spaced from each other relative to the plunger axis 20. The upper wall 34 and the lower wall 36 curve downward at each of the three corners. The apex (i.e., the highest point) of the top wall 34 is aligned with the plunger axis 20, and the three corners of the body 28 curve downward toward the syringe 12. Therefore, the body 28 resembles a bicycle seat, with dimensions that fit within the palm of the syringe user's hand. The surface area of ​​the upper surface of the top wall 34 is at least three times, and at most seven times, or more times the surface area of ​​the thumb pad 25.

[0063] In some embodiments, the attachment rod 30 is formed of an elastomeric material. In some embodiments, the attachment rod 30 is formed of a material that allows the attachment rod 30 to deform. For example... Figure 1B As shown, the third diameter D3 of the hole 32 in the attachment rod 30 is the same as the first diameter D1 of the plunger shaft 19. To connect the plunger 18 to the syringe interface device 14, the second end 24 of the plunger 18 is inserted and pushed through the hole 32 of the attachment rod 30. The material of the attachment rod 30 allows it to deform, so that the second end 24 of the plunger 18 enters the hollow space of the body 28 through the attachment rod 30. Figure 1C As shown, after the second end 24 of the plunger 18 is pushed through the hole 32 of the attachment rod 30, the second end 24 of the plunger 18 abuts against the top of the bottom wall 36 of the body 28. The syringe user applies force to the top wall 34 of the body 28, for example, with the palm of their hand. During the movement of the syringe interface device 14 and the plunger 18 to eject fluid, the thumb pad 25 can separate from the bottom wall 36 until the top wall 34 of the body 28 engages with the upper surface of the thumb pad 25.

[0064] like Figure 1C As shown, when the syringe interface device 14 is connected to the syringe 12, the attachment rod 30 is located radially outside the plunger shaft 19. The second diameter D2 of the second end 24 of the plunger 18 is larger than the third diameter D3 of the bore 32, so the second end 24 of the plunger 18 remains in the hollow space of the body 28, allowing the syringe interface device 14 to remain attached to the syringe 12. The second end 24 of the plunger 18 can be removed from the bore 32 by a force sufficient to deform the material of the attachment rod 30.

[0065] Figure 2A and Figure 2B Another syringe interface device 214 is shown, which is connected to the second end 24 of the plunger 18. The syringe interface device 214 includes a body 228 and an attachment rod 230.

[0066] like Figure 2BAs shown, the main body 228 includes a top wall 234 and a bottom wall 236. A portion of the top wall 234 and the bottom wall 236 define a hollow space. The top wall 234 is formed to include a apex aligned with the plunger axis 20. The top wall 234 forms an angle downwards from the apex relative to the plunger axis 20. As shown, the top wall 234 is conical. The bottom wall 236 is arranged radially inwards from the top wall 234 relative to the plunger axis 20 to define a portion of the hollow space between the top wall 234 and the bottom wall 236. The bottom wall 236 extends substantially perpendicular to the plunger axis 20.

[0067] like Figure 2A and Figure 2B As shown, attachment rod 230 is connected to and extends downward from bottom wall 236. Attachment rod 230 is formed to include a hole 232 extending through it. Hole 232 is aligned with plunger axis 20.

[0068] In some embodiments, such as Figure 2B As shown, the hole 232 of the attachment rod 230 is formed to include a thread 232T. (As...) Figure 2B As shown, the fourth diameter D4 of the hole 232 of the attachment rod 230 is substantially similar to the second diameter D2 of the second end 24 of the plunger 18. When the syringe interface device 214 is screwed or rotated onto the second end 24 of the plunger 18, the thread 232T of the hole 232 engages the second end 24 of the plunger 18. After the syringe interface device 214 is screwed onto the second end 24 of the plunger 18, the second end 24 of the plunger 18 is held within the hole 232 by the engaging thread 232T, so that the syringe interface device 214 remains attached to the syringe 12. The syringe user applies force, for example, with the palm of their hand to the top wall 234 of the body 228. The syringe interface device 214 can be removed by screwing the syringe interface device 214 in the opposite direction to that during connection. The surface area of ​​the upper surface of the top wall 234 is at least three times, at most seven times, or more times the surface area of ​​the thumb pad 25.

[0069] Figures 3A to 3C Another syringe interface device 314 is shown, which is coupled to the second end 24 of the plunger 18. The syringe interface device 314 includes a body 328 and an attachment rod 330. The body 328 is hollow, allowing it to receive the second end 24 of the plunger 18. The attachment rod 330 extends downward from the body 328 and is formed to include a hole 332 extending through the attachment rod 330 into the body 328. The hole 332 is aligned with the plunger axis 20.

[0070] like Figure 3AAs shown, the body 328 includes a top wall 334, a bottom wall 336, and a side wall 338. A hollow space is defined between the top wall 334 and the bottom wall 336. The side wall 338 extends around the plunger axis 20 and interconnects the top wall 334 and the bottom wall 336. As shown, the body 328 is cylindrical and has a substantially flat top wall 334 and a substantially flat bottom wall 336 relative to the plunger axis 20. The top wall 334 and the bottom wall 336 are substantially perpendicular to the plunger axis 20 and substantially parallel to each other. Although the body 328 is illustrated and described as cylindrical, other shapes that increase the surface area for the syringe user to apply force are also conceivable.

[0071] In some embodiments, the attachment rod 330 is formed of a plastic material. For example... Figure 3B As shown, the attachment rod 330 includes a first attachment portion 331 and a second attachment portion 333. The first attachment portion 331 and the second attachment portion 333 mate together around the plunger shaft 19 to connect the syringe interface device 314 to the syringe 12. As shown, the first attachment portion 331 and the second attachment portion 333 are each formed as half of a hollow cylinder. In an alternative embodiment, for example, the first attachment portion 331 and the second attachment portion 333 are each formed as half of a hollow rectangular prism.

[0072] like Figure 3B and Figure 3C As shown, each of the first attachment portion 331 and the second attachment portion 333 includes an outer surface 360 ​​and an inner surface 362 that is radially spaced inward from the outer surface 360 ​​relative to the plunger axis 20. The first attachment portion 331 includes two first contact surfaces 364 facing the second attachment portion 333 and interconnecting the outer surface 360 ​​and the inner surface 362 of the first attachment portion 331. The second attachment portion 333 includes two second contact surfaces 366 facing the first attachment portion 331 and interconnecting the outer surface 360 ​​and the inner surface 362 of the second attachment portion 333.

[0073] like Figure 3B and Figure 3C As shown, the first attachment portion 331 includes a tongue 368 extending outward from each first connector surface 364. The second attachment portion 333 includes a tongue receiving opening 370 extending inward from each second connector surface 366. Figure 3B As shown, the dimensions of each of the tongue receiving openings 370 are adapted to accommodate the corresponding tongue 368 so that the first attachment 331 and the second attachment 333 are connected together.

[0074] like Figure 3BAs shown, when the first attachment 331 and the second attachment 333 are connected, the inner surfaces 362 of the first attachment 331 and the second attachment 333 cooperate to form the hole 332 of the attachment rod 330. The diameter of the hole 332 is substantially equal to the first diameter D1 of the plunger shaft 19. To connect the syringe interface device 314 to the syringe 12, the plunger shaft 19 is positioned adjacent to the inner surface 362 of the second attachment 333, such that the second end 24 of the plunger 18 is located within the hollow space of the body 328. The first attachment 331 moves toward the second attachment 333 until each of the tabs 368 engages with the corresponding tab receiving port 370. The second end 24 of the plunger 18 is located on the top surface of the bottom wall 336 within the hollow space of the body 328, and the plunger shaft 19 is located radially inside the attachments 331 and 333, thus the syringe interface device 314 remains attached to the syringe 12. The syringe user applies force, for example, with the palm of their hand to the top wall 334 of the body 328. The surface area of ​​the upper surface of the top wall 334 is at least three times, and at most seven times or more, the surface area of ​​the thumb pad 25. The attachments 331, 333 can be unfastened to remove the syringe interface device 314 from the syringe 12.

[0075] In some embodiments, such as Figure 3C As shown, the second attachment 333 is fixed to the bottom wall 336 of the main body 328, while the first attachment 331 is not fixed to the bottom wall 336 of the main body 328. In some embodiments, the main body 328 is divided into two halves, such that the first part of the main body 328 is fixed to the first attachment 331, and the second part of the main body 328 is fixed to the second attachment 333.

[0076] like Figure 3C As shown, the tongue 368 and the tongue receiving opening 370 extend along the entire height of the attachment portions 331 and 333, respectively. In an alternative embodiment, the tongue 368 and the tongue receiving opening 370 extend along a portion of the height of the attachment portions 331 and 333, respectively.

[0077] In some embodiments, the syringe interface device 314 further includes a hook and loop fastener 351, such as Figure 4A and Figure 4B As shown, this is to secure the syringe interface device 314 to the user's hand. In this embodiment, the sidewall 338 of the body 328 is formed to include two openings 349 on opposite sides of the body 328, as... Figure 3CClearly shown. All openings 349 lead to the hollow space of the body 328. A hook and loop fastener 351 extends through one opening 349, through the hollow space of the body 328, and out of another opening 349. The syringe user can place their palm on the top wall 334 of the body 328 and wrap the hook and loop fastener 351 around their hand. The hook and loop fastener 351 is adjustable to fit the size of the syringe user's hand. The hook and loop fastener 351 connects the syringe user's hand to the syringe interface device 314, and then to the syringe 12. The hook and loop fastener 351 allows the syringe user to increase grip strength.

[0078] Figure 5A and Figure 5B Another syringe interface device 414 is shown, which is coupled to the second end 24 of the plunger 18. The syringe interface device 414 includes a body 428 and an attachment rod 430. The attachment rod 430 extends downward from the body 428 and is formed to include a hole 432 extending through the attachment rod 430. The hole 432 is aligned with the plunger axis 20.

[0079] like Figure 5A and Figure 5B As shown, the body 428 includes a top wall 434, a bottom wall 436, and a concave sidewall 438. A hollow space is defined between the top wall 434 and the bottom wall 436. An attachment rod 430 is connected to the bottom wall 436. The sidewall 438 extends about the plunger axis 20 and interconnects the top wall 434 and the bottom wall 436. As shown, the body 428 is cylindrical and has a substantially flat top wall 434 and a substantially flat bottom wall 436 relative to the plunger axis 20. The top wall 434 and the bottom wall 436 are substantially perpendicular to the plunger axis 20 and substantially parallel to each other. The sidewall 438 is concave and curves radially inward toward the plunger axis 20 to form an annular recess 439 extending circumferentially around the sidewall 438. If the syringe user decides to hold the syringe interface device 414 in this manner, the recess 439 is sized to accommodate the syringe user's fingers to allow the syringe user to increase grip strength.

[0080] In some embodiments, the attachment rod 430 is formed of an elastomeric material. In some embodiments, the attachment rod 430 is formed of a material that allows the attachment rod 430 to deform. The diameter of the hole 432 of the attachment rod 430 is substantially similar to the second diameter D2 of the second end 24 of the plunger 18.

[0081] In some embodiments, such as Figure 5A As shown, the syringe interface device 414 also includes a tightening unit 460. The tightening unit 460 includes a tightening head 462 and a tightening cable 464. The tightening head 462 is coupled to and configured to rotate relative to the attachment rod 430. The tightening cable 464 is coupled to the tightening head 462 and extends around the attachment rod 430. As the tightening head 462 rotates, the tightening cable 464 winds around and unwinds around the tightening head 462 according to the direction of rotation. Figure 5A As shown, both ends of the tightening line 464 are connected to the tightening head 462, and the tightening line 464 extends loosely around the attachment rod 430.

[0082] To connect the syringe interface device 414 to the syringe 12, the second end 24 of the plunger 18 is inserted into the hole 432 of the attachment rod 430. The second end 24 of the plunger 18 remains in the hole 432 of the attachment rod 430. The diameter of the hole 432 is similar to the second diameter D2 of the second end 24 of the plunger 18, so the tightening unit 460 holds the second end 24 of the plunger 18 within the hole 432. When the second end 24 of the plunger 18 is within the hole 432, the tightening line 464 winds around the tightening head 462, so in response to the rotation of the tightening head 462, the tightening line 464 tightens around the attachment rod 430. The tightening line 464 tightens the second end 24 of the plunger 18 below the attachment rod 430 until the tightening line 464 has been fully tightened around the attachment rod 430 (and the plunger shaft 19 inside the attachment rod 430). The tightening line 464 holds the second end 24 of the plunger 18 above the tightening line 464. The syringe user applies force, for example, with the palm of their hand to the top wall 434 of the body 428. The surface area of ​​the upper surface of the top wall 434 is at least three times, at most seven times, or more times the surface area of ​​the thumb pad 25.

[0083] To remove the syringe interface device 414 from the syringe 12, the tightening head 462 rotates in the reverse direction. When the tightening head 462 rotates in the reverse direction, the tightening line 464 unwinds from the tightening head 462 and loosens around the attachment rod 430 so that the plunger 18 can be removed from the hole 432.

[0084] In some embodiments, the syringe interface device 414 includes an alternative tightening unit 466 (e.g., Figure 5B (As shown) instead of tightening unit 460. Tightening unit 466 includes a tightening clamp 468 and a fastener 470. Tightening clamp 468 is coupled to attachment rod 430 and configured to tighten around attachment rod 430. Tightening clamp 468 includes a first end and a second end. Fastener 470 is coupled to and extends from the first end of tightening clamp 468. The second end of tightening clamp 468 is formed to include a fastener receiving opening 472, which is sized to receive fastener 470 to tighten tightening clamp 468 around attachment rod 430. When fastener 470 is not coupled to fastener receiving opening 472, as... Figure 5B As shown, the tightening hoop 468 does not form a complete hoop around the attachment rod 430.

[0085] To connect the syringe interface device 414 to the syringe 12, the second end 24 of the plunger 18 is inserted into the hole 432 of the attachment rod 430. The second end 24 of the plunger 18 remains in the hole 432 of the attachment rod 430. The diameter of the hole 432 is similar to the second diameter D2 of the second end 24 of the plunger 18, so the tightening unit 466 holds the second end 24 of the plunger 18 within the hole 432. After the second end 24 of the plunger 18 is inserted into the hole 432, the fastener 470 is engaged with the fastener receiving port 472 to tighten the clamp 468 around the attachment rod 430.

[0086] The tightening clamp 468 secures the second end 24 of the plunger 18 below the attachment rod 430 until the tightening clamp 468 is fully tightened around the attachment rod 430 (and the plunger shaft 19 inside the attachment rod 430). The tightening clamp 468 holds the second end 24 of the plunger 18 above the tightening clamp 468. The syringe user applies force, for example, with the palm of their hand to the top wall 434 of the body 428. To remove the syringe interface device 414 from the syringe 12, disengage the fastener 470 from the fastener receiving port 472 and loosen the tightening clamp 468 around the attachment rod 430.

[0087] In some embodiments, the tightening clamp 468 is formed of a plastic material. In some embodiments, the tightening clamp 468 is formed of an elastomeric material. In some embodiments, such as Figure 5B As shown, the tightening clamp 468 is made of a resilient or stretchable material, with its intermediate region adhered to or otherwise secured to the attachment rod 430 to retain the tightening clamp 468 thereon when the fastener 470 is not secured to the fastener receiving port 472. In some embodiments, the fastener 470 is a threaded screw, and the fastener receiving port 472 is formed such that its contained threads engage with the threads of the fastener 470.

[0088] Figure 6 Another syringe interface device 514 is shown, which can be coupled to the second end 24 of the plunger 18. The syringe interface device 514 includes a body 528 and an attachment rod 530. The body 528 includes a top wall 534 and a bottom wall 536. The top wall 534 of the body 528 is M-shaped, coupled to and extending upward from the opposite edge of the bottom wall 536. The attachment rod 530 extends downward from the bottom wall 536.

[0089] like Figure 6As shown, a top wall 534 extends between a first end 535 and a second end 537. The first end 535 of the top wall 534 is connected to the first end 539 of the bottom wall 536, and the second end 537 of the top wall 534 is connected to the second end 541 of the bottom wall 536, with the second end 541 of the bottom wall 536 opposite to the first end 539. The first end 535 of the top wall 534 extends upward from the first end 539 of the bottom wall 536, and the second end 537 of the top wall 534 extends upward from the second end 541 of the bottom wall 536, forming a finger-receiving area 544 between the top wall 534 and the bottom wall 536.

[0090] like Figure 6 As shown, the top wall 534 bends between the first end 535 and the second end 537 to form a finger-receiving groove 546. The syringe user's fingers wrap around the bottom of the top wall 534, for example, applying force to the finger-receiving groove 546 with part of the palm and multiple fingers. Although two finger-receiving grooves 546 are shown in the figure, any number of finger-receiving grooves 546 should be imagined, such as, but not limited to, one groove, two grooves, three grooves, or four grooves.

[0091] like Figure 6 As shown, the bottom wall 536 is substantially perpendicular to the plunger axis 20. In some embodiments, the bottom wall 536 is formed as an annular disk extending around the plunger axis 20. In alternative embodiments, the bottom wall 536 is formed as a rectangular prism. In some embodiments, the body 528 is formed as a single integral component.

[0092] In some embodiments, the attachment rod 530 is formed of a plastic material. In exemplary embodiments, such as... Figure 6 As shown, the attachment rod 530 includes a first attachment arm 531 and a second attachment arm 533. The first attachment arm 531 and the second attachment arm 533 are radially spaced from each other, such that the plunger 18 is radially accommodated between the first attachment arm 531 and the second attachment arm 533. A first tab 560 is connected to the bottom end of the first attachment arm 531. A second tab 562 is connected to the bottom end of the second attachment arm 533. Each of the first tab 560 and the second tab 562 extends radially inward relative to each other toward the plunger axis 20. The distance between the first tab 560 and the second tab 562 is less than the second diameter D2 of the second end 24 of the plunger 18. When the second end 24 of the plunger 18 is inserted between the first attachment arm 531 and the second attachment arm 533 into the syringe interface device 514, the tabs 560 and 562 snap onto the underside of the second end 24 of the plunger 18. When the second end 24 of the plunger 18 is inserted between the first attachment arm 531 and the second attachment arm 533, the tabs 560 and 562 bend outward to allow the second end 24 of the plunger 18 to move past the tabs 560 and 562. The second end 24 of the plunger 18 abuts against the top of the tabs 560 and 562, so that the syringe interface device 514 remains attached to the syringe 12.

[0093] like Figure 6As shown, each protrusion 560, 562 includes a top surface 564 and an angled surface 566. The top surface 564 faces the bottom wall 536 of the body 528 and engages the second end 24 of the plunger 18 after the plunger 18 is inserted into the syringe interface device 514. The top surface 564 is substantially perpendicular to the plunger axis 20. Figure 6 As shown, the beveled surface 566 is angled relative to the plunger axis 20. When the second end 24 is inserted into the syringe interface device 514, the beveled surface 566 engages the second end 24 of the plunger 18. The second end 24 of the plunger 18 moves upward to the beveled surface 566 engaging the tongues 560, 562, thereby pushing the tongues 560, 562 radially outward, allowing the second end 24 of the plunger 18 to be inserted into the syringe interface device 514. To remove the syringe 12 from the syringe interface device 514, the tongues 560, 562 move radially outward and away from each other, creating a gap for the second end 24 of the plunger 18 to be removed from the syringe interface device 514.

[0094] Figure 7A and Figure 7B Another syringe interface device 614 is shown, which is connected to the second end 24 of the plunger 18. (See diagram) Figure 7B As shown, the syringe interface device 614 includes a body 628 with a slit 631 extending therein. The slit 631 extends through the body 628 without bisecting the edge of the body 628. That is, the slit 631 is parallel to the length direction of the body 628. As shown, the body 628 is a hook and loop fastener 628. The slit 631 is sized to accommodate the second end 24 of the plunger 18. After the second end 24 of the plunger 18 is inserted through the slit 631, the hook and loop fastener 628 is held on the second end 24 of the plunger 18, so that the syringe interface device 14 remains attached to the syringe 12. The hook and loop fastener 628 is wrapped around the syringe user's hand, and the opposite ends 635, 637 of the hook and loop fastener 628 are connected to each other to secure the syringe interface device 614 to the syringe user's hand. The hook and loop fastener 628 is adjustable according to the size of the syringe user's hand, because the hook and loop fastener 628 can be tightened and loosened around the syringe user's hand. The syringe user applies force, for example, with the palm of their hand to the second end 24 of the plunger 18. In order to remove the syringe 12 from the syringe interface device 614, the second end 24 of the plunger 18 passes through the slit 631.

[0095] Figure 8A and Figure 8B Another syringe interface device 714 is shown, which is connected to the second end 24 of the plunger 18. The syringe interface device 714 includes a handle-shaped body 728, a body adjustment connector 729, and an attachment rod 730. The angle of the body 728 relative to the plunger axis 20 can be adjusted using the body adjustment connector 729. For example, as... Figure 8A As shown, the main body 728 extends along the plunger axis 20. Figure 8BAs shown, the body 728 extends at an angle of approximately 60 degrees relative to the plunger axis 20. However, the body 728 can also extend at any angle relative to the plunger axis 20. Some syringe users will find that if the body 728 extends at a specific angle relative to the plunger axis 20, it is easier to grip the body 728 and thus easier to apply force to the plunger 18. Syringe users will find that specific body movements and / or grip angles are easier to achieve; therefore, the body adjustment connector 729 allows the syringe user to adapt the syringe interface device 714 to the body movement and / or grip angle most easily achieved by the syringe user. As shown, the body adjustment connector 729 is formed as a ball-and-socket connector. An attachment rod 730 extends downward from the body adjustment connector 729 and connects to the second end 24 of the plunger 18.

[0096] like Figure 8A and Figure 8B As shown, the main body 728 includes a top wall 734, a bottom wall 736, and a side wall 738. The side wall 738 extends between the top wall 734 and the bottom wall 736, interconnecting the top wall 734 and the bottom wall 736. A main body adjustment joint 729 extends downward from the bottom wall 736. Figure 8A and Figure 8B As shown, at least a portion of the sidewall 738 is formed thereon, including a finger groove 746. The syringe user's finger wraps around the sidewall 738 and fits into the finger groove 746 to apply force to the plunger 18. Although three finger grooves 746 are shown in the figure, any number of finger grooves 746 should be contemplated, such as, but not limited to, one groove, two grooves, three grooves, or four grooves.

[0097] like Figure 8A and Figure 8B As shown, the main body adjusting connector 729 includes a ball 756 and a ball-receiving socket 758, the ball-receiving socket 758 being formed with a recess 760 sized to accommodate the ball 756. The ball 756 is fixed to a bottom wall 736, such that the bottom wall 736, and consequently the main body 728, moves with the ball 756. The ball 756 is coupled to the ball-receiving socket 758 to rotate within the recess 760 of the ball-receiving socket 758. The ball 756 rotates within the recess 760 to adjust the angle of the main body 728 relative to the plunger axis 20. Figure 8A and Figure 8B This means that the syringe user holds the body 728 and moves the body 728, causing the ball 756 to move within the recess 760 to adjust the angle of the body 728 relative to the plunger axis 20.

[0098] like Figure 8AAs shown, the attachment rod 730 extends downward from the receptacle 758 and is formed to include a hole 732 extending through the attachment rod 730 to receive the second end 24 of the plunger 18. In some embodiments, the attachment rod 730 is formed of an elastomeric material. In this embodiment, the diameter of the hole 732 of the attachment rod 730 is substantially similar to the first diameter D1 of the plunger shaft 19. The elastomeric material of the attachment rod 730 is configured to deform so that the second end 24 of the plunger 18 enters the hollow space of the receptacle 758 through the attachment rod 730. After the second end 24 of the plunger 18 is pushed through the hole 732, the second end 24 of the plunger 18 abuts against the hollow space of the receptacle 758, such that the syringe interface device 714 remains attached to the syringe 12.

[0099] Figure 9 Another syringe interface device 814 is shown that can be coupled to the second end 24 of the plunger 18. The syringe interface device 814 includes a body 828 in the form of a handle and an attachment rod 830. The body 828 extends along the plunger axis 20.

[0100] like Figure 9 As shown, the main body 828 includes a top wall 834, a bottom wall 836, and a side wall 838. The side wall 838 extends between the top wall 834 and the bottom wall 836, interconnecting the top wall 834 and the bottom wall 836. In some embodiments, the top wall 834 is substantially flat relative to the plunger axis 20 (i.e., perpendicular to the plunger axis 20). In some embodiments, the top wall 834 and the side wall 838 are formed as continuous walls, such that the top wall 834 is arched.

[0101] like Figure 9 As shown, at least a portion of the sidewall 838 is formed thereon, including a gripping cavity or recess 846. The syringe user's fingers wrap around the sidewall 838 and conform to the gripping cavity 846 to enhance the user's grip on the syringe interface device 814. In an exemplary embodiment, the gripping cavity 846 extends along the plunger axis 20 on the sidewall 838 between the top wall 834 and the bottom wall 836 (i.e., the gripping cavity 846 extends parallel to the plunger axis 20). In an alternative embodiment, the gripping cavity 846 extends circumferentially around the sidewall 838 (i.e., the gripping cavity 846 extends perpendicular to the plunger axis 20). Any number of gripping cavities 846 may be formed on the sidewall 838.

[0102] like Figure 9 As shown, the attachment rod 830 extends downward from the bottom wall 836 of the body 828. In some embodiments, the syringe interface device 814 further includes a first connector 860 attached to the bottom surface of the attachment rod 830 and a second connector 862 attached to the top surface of the second end 24 of the plunger 18. The first connector 860 and the second connector 862 engage with each other to hold the syringe interface device 814 on the syringe 12.

[0103] For example, in some embodiments, the connectors 860 and 862 are hook and loop fasteners. One side of the hook and loop fastener is attached to the bottom surface of the attachment rod 830, and the other side is attached to the top surface of the second end 24 of the plunger 18. In response to the syringe interface device 814 being pressed against the second end 24 of the plunger 18, the connectors 860 and 862 temporarily fasten the syringe interface device 814 to the syringe 12.

[0104] In some embodiments, the connectors 860, 862 are magnets. One magnet is attached to the second end 24 of the plunger 18, for example, by an adhesive. Another magnet is attached to (or embedded in) the attachment rod 830. In response to the syringe interface device 814 and the second end 24 of the plunger 18 being placed close to each other, the magnets attract each other to temporarily hold the syringe interface device 814 on the syringe 12. In some embodiments, the attachment rod 830 is omitted entirely, such that the first connector 860 is attached to or embedded in the bottom wall 836 of the body 628.

[0105] Figures 10 to 12 Another syringe interface device 914 is shown attached to the second end 24 of the plunger 18. The syringe interface device 914 includes a body 928 and an attachment rod 930. The attachment rod 930 extends downward from the body 928. In an exemplary embodiment, the attachment rod 930 includes a first attachment arm 931 and a second attachment arm 933. Although two attachment arms 931, 933 are shown in the figure, any number of attachment arms is contemplated.

[0106] like Figure 10 As shown, the body 928 includes a top wall 934, a bottom wall 936, and a side wall 938. As shown, the body 928 is cylindrical and has a substantially flat top wall 934 and a substantially flat bottom wall 936 relative to the plunger axis 20. The top wall 934 and bottom wall 936 are substantially perpendicular to the plunger axis 20 and parallel to each other. The side wall 938 extends around the plunger axis 20 and interconnects the top wall 934 and the bottom wall 936. A first attachment arm 931 and a second attachment arm 933 are connected to the bottom wall 936 on opposite sides of the bottom wall 936 relative to the plunger axis 20. The first attachment arm 931 and the second attachment arm 933 are radially spaced from each other, such that the syringe 12 is radially accommodated between the first attachment arm 931 and the second attachment arm 933.

[0107] Although the diagram shows a cylindrical body 928, the body 928 can be any other shape that increases the surface area for the syringe user to apply force. For example, the shape of the body 928 can be similar to other shapes such as body 28, body 228, body 428, body 528, body 728, or body 828.

[0108] In some embodiments, the first attachment arm 931 and the second attachment arm 933 are formed of an elastomeric material. In some embodiments, the first attachment arm 931 and the second attachment arm 933 are formed of rubber-coated metal. Figure 11 and Figure 12 As shown, the first attachment arm 931 and the second attachment arm 933 are flexible, allowing the first attachment arm 931 and the second attachment arm 933 to move toward the plunger shaft 19.

[0109] like Figure 10 As shown, the first attachment arm 931 and the second attachment arm 933 each include a first end 951 fixed to the bottom wall 936 and a second end 953 that is freely movable relative to the first end 951. The second end 953 of each attachment arm 931, 933 is freely movable toward and away from the plunger shaft 19.

[0110] like Figure 11 As shown, in some embodiments, the syringe interface device 914 further includes a tensioning device 955, such as an elastic clamp. The tensioning device 955 connects the first attachment arm 931 and the second attachment arm 933 to the plunger shaft 19. For example, to connect the syringe interface device 914 to the syringe 12, the second end 24 of the plunger 18 is positioned below the body 928 of the syringe interface device 914 and radially positioned between the first attachment arm 931 and the second attachment arm 933. The first attachment arm 931 and the second attachment arm 933 move radially inward toward each other or toward the plunger shaft 19. The tensioning device 955 clamps the first attachment arm 931 and the second attachment arm 933 over the first attachment arm 931 and the second attachment arm 933, thereby holding the syringe interface device 914 onto the syringe 12. The syringe user applies force, for example, with the palm of their hand against the top wall 934 of the body 928. The surface area of ​​the upper surface of the top wall 934 is at least three times, and at most seven times or more, the surface area of ​​the thumb pad 25.

[0111] To remove the syringe interface device 914 from the syringe 12, the tensioning device 955 is loosened over the first attachment arm 931 and the second attachment arm 933, preventing it from extending around the first attachment arm 931 and the second attachment arm 933. In some embodiments, the tensioning device 955 is completely separable from the first attachment arm 931 and the second attachment arm 933. In some embodiments, the tensioning device 955 is secured to one of the attachment arms 931, 933. For example, in such an embodiment, one of the attachment arms 931, 933 is formed with a through-hole including a second end 953 through the attachment arm 931, 933. The tensioning device 955 extends through the through-hole, such that the tensioning device 955 remains attached to one of the attachment arms 931, 933.

[0112] like Figure 12As shown, in some embodiments, attachment arms 931, 933 are configured to be screwed around the plunger shaft 19 of the plunger 18 to engage the syringe interface device 914 with the syringe 12. To remove the syringe interface device 914 from the syringe 12, attachment arms 931, 933 are unscrewed from the plunger shaft 19.

[0113] In some embodiments of the syringe interface device 914, the tensioning device 955 is completely omitted. In some embodiments of the syringe interface device 914, the tensioning device 955 is included in the syringe interface device 914, and the attachment arms 931, 933 are configured to be screwed around the plunger shaft 19, allowing the syringe user to use one or both attachment methods.

[0114] Although the figures illustrate syringe interface devices 14, 214, 314, 414, 514, 714, 814, and 914 each having corresponding attachment rods 30, 230, 330, 430, 530, 730, 830, and 930, each syringe interface device 14, 214, 314, 414, 514, 714, 814, and 914 may include any attachment rod 30, 230, 330, 430, 530, 730, 830, or 930 disclosed herein. For example, in some embodiments, syringe interface device 14 includes any attachment rod 230, 330, 430, 530, or 930. In some embodiments, syringe interface device 14 includes connectors 860 and 862.

[0115] In some embodiments, the syringe interface device 214 includes any attachment rods 30, 330, 430, 530, and 930. In some embodiments, the syringe interface device 214 includes connectors 860 and 862.

[0116] In some embodiments, the syringe interface device 314 includes any attachment rods 30, 230, 430, 530, and 930. In some embodiments, the syringe interface device 314 includes connectors 860 and 862. In some embodiments, the syringe interface device 414 includes any attachment rods 30, 230, 330, 530, and 930. In some embodiments, the syringe interface device 414 includes connectors 860 and 862.

[0117] In some embodiments, the syringe interface device 514 includes any attachment rods 30, 230, 330, 430, and 930. In some embodiments, the syringe interface device 514 includes connectors 860 and 862. In some embodiments, the syringe interface device 714 includes any attachment rods 30, 230, 330, 430, 530, and 930. In some embodiments, the syringe interface device 714 includes connectors 860 and 862.

[0118] In some embodiments, the syringe interface device 814 includes any attachment rod 30, 230, 330, 430, 530, 930. In some embodiments, the bodies 28, 228, 428, 928 of the syringe interface devices 14, 214, 414, 914 are formed to include an opening 349 for allowing a hook and loop fastener 351 to extend through and wrap around the user's hand. In alternative embodiments, the plunger 18 and any syringe interface device 14, 214, 314, 414, 514, 714, 814, 914 are made as a single component, such that the plunger 18 and the syringe interface device 14, 214, 314, 414, 514, 714, 814, 914 are permanently fixed to each other.

[0119] In some embodiments, syringe interface devices 14, 214, 314, 414, 514, 714, 814, and 914 are formed of rigid plastic. In some embodiments, syringe interface devices 14, 214, 314, 414, 514, 714, 814, and 914 are formed of soft plastic. In some embodiments, syringe interface devices 14, 214, 314, 414, 514, 714, 814, and 914 are formed of rubber. In some embodiments, syringe interface devices 14, 214, 314, 414, 514, 714, 814, and 914 are formed of polymer. In some embodiments, syringe interface devices 14, 214, 314, 414, 514, 714, 814, and 914 are formed of elastomer. In some embodiments, the syringe interface devices 14, 214, 314, 414, 514, 714, 814, and 914 are made of metal.

[0120] In some embodiments, the syringe interface devices 14, 214, 314, 414, 514, 714, 814, 914 and the attachment rods 30, 230, 330, 430, 530, 730, 830, 930 connected to the syringe interface devices 14, 214, 314, 414, 514, 714, 814, 914 are formed of the same material. In some embodiments, the syringe interface devices 14, 214, 314, 414, 514, 714, 814, 914 and the attachment rods 30, 230, 330, 430, 530, 730, 830, 930 connected to the syringe interface devices 14, 214, 314, 414, 514, 714, 814, 914 are formed of different materials.

[0121] This disclosure envisions two or more syringe interface devices 14, 214, 314, 414, 514, 614, 714, 814, 914 (up to all syringe interface devices 14, 214, 314, 414, 514, 614, 714, 814, 914) that can be included in a kit sold to the user, with or without one or more syringes 12. The purchaser of such a kit can choose which syringe interface device 14, 214, 314, 414, 514, 614, 714, 814, 914 to use with the syringe 12 when administering liquid medication to themselves or others. If the syringe 12 is reusable, the purchaser of the kit may choose to replace one of the syringe interface devices 14, 214, 314, 414, 514, 614, 714, 814, 914 with another syringe interface device 14, 214, 314, 414, 514, 614, 714, 814, 914 before the subsequent use of the syringe 12.

[0122] The embodiments of the present invention can be described with reference to the following numbered clauses:

[0123] Clause 1. An adaptive syringe plunger assembly, comprising: a syringe configured to eject fluid, the syringe including a syringe body and a plunger, the plunger being at least partially housed within the syringe body and slidable along a plunger axis, the plunger having a first end disposed within the syringe body and a second end disposed outside the syringe body opposite to the first end; and a plurality of syringe interface devices, each detachably coupled to the second end of the plunger and configured to receive force applied by a syringe user to slide the plunger within the syringe body and eject fluid from the syringe body; wherein each of the plurality of syringe interface devices increases the surface area for the syringe user to apply force to a corresponding one of the plurality of syringe interface devices coupled to the second end of the plunger, and each of the plurality of syringe interface devices has a different shape.

[0124] Clause 2. The adaptive syringe plunger assembly according to Clause 1, wherein at least one of the plurality of syringe interface devices includes a body and an attachment rod, the attachment rod being formed to include a hole for receiving a second end of the plunger, the body including a top wall and a bottom wall opposite the top wall, and the attachment rod extending downward from the bottom wall of the body and aligned with the plunger axis.

[0125] Clause 3. The adaptive syringe plunger assembly according to Clause 2, wherein at least one of the plurality of syringe interface devices has a body in the shape of a triangle, with its three rounded corners circumferentially spaced from each other relative to the plunger axis, and the top wall of the body is bent downward toward the attachment rod at each of the three rounded corners such that the apex of the body is aligned with the plunger axis.

[0126] Clause 4. The adaptive syringe plunger assembly according to Clause 2, wherein at least one of the plurality of syringe interface devices has a conical body, the apex of the body being aligned with the plunger axis, and the top wall extending downward from the apex.

[0127] Clause 5. The adaptive syringe plunger assembly according to Clause 2, wherein at least one of the plurality of syringe interface devices has a cylindrical body and the top wall of the body is substantially flat.

[0128] Clause 6. The adaptive syringe plunger assembly according to Clause 5, wherein the body includes a sidewall extending between the top wall and the bottom wall of the body and interconnecting the top wall and the bottom wall, and the sidewall is radially inwardly curved toward the plunger axis to form a recess sized to accommodate the finger of the syringe user.

[0129] Clause 7. The adaptive syringe plunger assembly according to Clause 2, wherein the bottom wall has a first end and a second end opposite to the first end, and the top wall extends upward from and connects to the first and second ends of the bottom wall to form a finger-receiving area between the top wall and the bottom wall.

[0130] Clause 8. The adaptive syringe plunger assembly according to Clause 2, wherein the body includes a sidewall extending between the top wall and the bottom wall of the body and interconnecting the top wall and the bottom wall, and at least a portion of the sidewall is formed to include a finger-receiving groove sized to accommodate the finger of the syringe user.

[0131] Clause 9. The adaptive syringe plunger assembly according to Clause 2, wherein a hole in the attachment rod of at least one of the plurality of syringe interface devices is formed to include a thread that mates with a second end of the plunger, such that at least one of the plurality of syringe interface devices is detachably connected to the plunger.

[0132] Clause 10. The adaptive syringe plunger assembly according to Clause 2, wherein at least a portion of the attachment rod is formed of an elastomeric material, and the elastomeric material is configured to deform to detachably connect at least one of the plurality of syringe interface devices to the plunger.

[0133] Clause 11. The adaptive syringe plunger assembly according to Clause 2, wherein the attachment rod is formed including a first attachment portion and a second attachment portion, the first attachment portion having a tongue that extends radially from the first attachment portion into a tongue receiving opening formed in the second attachment portion to engage the first attachment portion with the second attachment portion, the first attachment portion and the second attachment portion of the attachment rod cooperating to form the hole for receiving the plunger, and the first attachment portion and the second attachment portion being detachably coupled together to detachably engage at least one of the plurality of syringe interface devices with the plunger to the plunger.

[0134] Clause 12. The adaptive syringe plunger assembly according to Clause 1, wherein at least one of the plurality of syringe interface devices includes a hook and loop fastener formed to include a slit extending therethrough and sized to receive a second end of the plunger, so that at least one of the plurality of syringe interface devices is detachably coupled to the plunger.

[0135] Clause 13. The adaptive syringe plunger assembly according to Clause 1, wherein at least one of the plurality of syringe interface devices includes a body and an attachment rod, the attachment rod being formed to receive a second end of the plunger, the body including a top wall and a bottom wall opposite the top wall, and the attachment rod extending downward from the bottom wall of the body and aligned with the plunger axis, the bottom wall having a first end and a second end opposite the first end, and the top wall extending upward from and connecting to the first and second ends of the bottom wall to form a finger-receiving area between the top wall and the bottom wall; wherein the attachment rod includes a first attachment arm extending downward from the body and a second attachment arm extending downward from the body and radially spaced from the first attachment arm, each of the first attachment arm and the second attachment arm being formed to include a tab extending radially inward from the bottom edge of each of the first attachment arm and the second attachment arm, each tab being configured to snap onto a portion below the second end of the plunger to allow at least one of the plurality of syringe interface devices to be detachably connected to the plunger.

[0136] Clause 14. The adaptive syringe plunger assembly according to Clause 1, wherein at least one of the plurality of syringe interface devices includes a body, a first attachment arm extending downward from the body, and a second attachment arm extending downward from the body and radially spaced from the first attachment arm; wherein a tensioning unit extends around the first attachment arm, the second attachment arm, and the plunger to allow the plunger to be detachably coupled to at least one of the plurality of syringe interface devices.

[0137] Clause 15. The adaptive syringe plunger assembly according to Clause 1, wherein at least one of the plurality of syringe interface devices includes a body, a first attachment arm extending downward from the body, and a second attachment arm extending downward from the body and radially spaced from the first attachment arm; wherein the first attachment arm and the second attachment arm are configured to wrap around the plunger such that at least one of the plurality of syringe interface devices is detachably coupled to the plunger.

[0138] Clause 16. The adaptive syringe plunger assembly according to Clause 1, wherein the plunger includes a plunger shaft extending between a first end and a second end of the plunger and interconnecting the first end and the second end of the plunger and having a first diameter, the second end of the plunger being a thumb pad having a second diameter, and the second diameter being greater than the first diameter.

[0139] Clause 17. The adaptive syringe plunger assembly according to Clause 16, wherein at least one of the plurality of syringe interface devices includes a hollow body and an attachment rod extending downward from the hollow body, the attachment rod having a third diameter smaller than the second diameter of the thumb pad, and the attachment rod being configured to deform so that the thumb pad is received in the hollow body via the attachment rod.

[0140] Clause 18. An adaptive syringe plunger assembly comprising: a syringe configured to eject fluid, the syringe including a syringe body and a plunger, the plunger being at least partially housed within the syringe body and slidable along a plunger axis, the plunger having a first end disposed within the syringe body and a second end disposed outside the syringe body opposite to the first end; and a syringe interface device configured to be detachably coupled to the second end of the plunger to receive force applied by a user's palm to cause the plunger to slide within the syringe body and eject fluid from the syringe body, the syringe interface device including a body and an attachment rod extending downward from the body for detachable coupling to the second end of the plunger; wherein the syringe interface device is configured to increase the surface area for the user to apply force to the syringe interface device.

[0141] Clause 19. The adaptive syringe plunger assembly according to Clause 18, wherein the attachment rod is formed to include an orifice sized to receive the plunger, the body is formed to include a top wall and a bottom wall opposite the top wall, and the attachment rod extends downward from the bottom wall of the body and is aligned with the plunger axis.

[0142] Clause 20. The adaptive syringe plunger assembly according to Clause 19, wherein the body is triangular, with its three corners circumferentially spaced relative to the plunger axis, and the top wall of the body bends downward at each of the three corners such that the apex of the body is aligned with the plunger axis.

[0143] Clause 21. The adaptive injector plunger assembly according to Clause 19, wherein the body is conical, the apex of the body is aligned with the plunger axis, and the top wall extends downward from the apex.

[0144] Clause 22. The adaptive injector plunger assembly according to Clause 19, wherein the body is cylindrical and the top wall of the body is substantially flat.

[0145] Clause 23. The adaptive syringe plunger assembly according to Clause 22, wherein the body includes a sidewall extending between the top wall and the bottom wall of the body and interconnecting the top wall and the bottom wall, and the sidewall is radially inwardly curved toward the plunger axis to form a recess sized to accommodate the finger of the syringe user.

[0146] Clause 24. The adaptive syringe plunger assembly according to Clause 19, wherein the bottom wall has a first end and a second end opposite to the first end, and the top wall extends upward from the first and second ends of the bottom wall to form a finger-receptive area between the top wall and the bottom wall.

[0147] Clause 25. The adaptive syringe plunger assembly of Clause 19, wherein the body includes a sidewall extending between the top wall and the bottom wall of the body and interconnecting the top wall and the bottom wall, and the sidewall is formed to include a finger-receiving groove sized to accommodate the finger of the syringe user.

[0148] Clause 26. The adaptive syringe plunger assembly according to Clause 19, wherein the hole in the attachment rod is formed to include a thread that mates with a second end of the plunger to allow the syringe interface device to be detachably connected to the plunger.

[0149] Clause 27. The adaptive syringe plunger assembly according to Clause 19, wherein at least a portion of the attachment rod is formed of an elastomeric material, and the elastomeric material is configured to deform to allow the syringe interface device to be detachably coupled to the plunger.

[0150] Clause 28. The adaptive syringe plunger assembly according to Clause 19, wherein the attachment rod is formed including a first attachment portion and a second attachment portion, the first attachment portion having a tongue that extends radially from the first attachment portion into a tongue receiving opening formed in the second attachment portion to engage the first attachment portion and the second attachment portion together, the first attachment portion and the second attachment portion of the attachment rod cooperating to form a hole sized to accommodate the plunger, and the first attachment portion and the second attachment portion being engaged together to allow the syringe interface device to be detachably coupled to the plunger.

[0151] Clause 29. The adaptive syringe plunger assembly of Clause 18, wherein the attachment rod includes a first attachment arm extending downward from the body and a second attachment arm extending downward from the body and radially spaced from the first attachment arm; wherein a tensioning unit is wound around the first attachment arm and the second attachment arm to engage the first attachment arm and the second attachment arm with the plunger, the tensioning unit being located radially outside the first attachment arm and the second attachment arm.

[0152] Clause 30. The adaptive syringe plunger assembly of Clause 18, wherein the attachment rod includes a first attachment arm extending downward from the body and a second attachment arm extending downward from the body and radially spaced from the first attachment arm; wherein the first attachment arm and the second attachment arm are configured to wrap around the plunger to removably connect the syringe interface device to the plunger.

[0153] Although certain exemplary embodiments have been described in detail above, variations and modifications exist within the scope and spirit of this disclosure as described and defined in the claims.

Claims

1. An adaptive syringe plunger, characterized by, Comprising: a syringe configured to eject a fluid, the syringe including a syringe body and a plunger at least partially housed within the syringe body for slidable movement along a plunger axis, the plunger having a first end disposed within the interior of the syringe body and a second end disposed outside of the syringe body opposite the first end; and a plurality of syringe interface devices each removably coupled to the second end of the plunger and configured to accept an application of force by a syringe user to cause the plunger to slide within the syringe body and eject the fluid from the syringe body; wherein each of the plurality of syringe interface devices increases a surface area over which the syringe user applies force to a corresponding one of the plurality of syringe interface devices coupled to the second end of the plunger, and each of the plurality of syringe interface devices has a different shape.

2. The adaptive syringe plunger of claim 1, wherein, At least one of the plurality of syringe interface devices includes a body and an attachment stem formed to include a bore for receiving the second end of the plunger, the body including a top wall and a bottom wall opposite the top wall, and the attachment stem extending downwardly from the bottom wall of the body and aligned with the plunger axis.

3. The adaptive syringe plunger of claim 2, wherein, A body of at least one of the plurality of syringe interface devices is triangular with three rounded corners circumferentially spaced from one another relative to the plunger axis, and the top wall of the body is curved downwardly toward the attachment stem at each of the three rounded corners such that an apex of the body is aligned with the plunger axis.

4. The adaptive syringe plunger of claim 2, wherein, A body of at least one of the plurality of syringe interface devices is conical with an apex of the body aligned with the plunger axis, and the top wall extends downwardly from the apex.

5. The adaptive syringe plunger of claim 2, wherein, A body of at least one of the plurality of syringe interface devices is cylindrical, and the top wall of the body is flat.

6. The adaptive syringe plunger of claim 5, wherein, The body includes a side wall extending between and interconnecting the top wall and the bottom wall of the body, and the side wall is curved radially inwardly toward the plunger axis to form a recess sized to receive a finger of the syringe user.

7. The adaptive syringe plunger of claim 2, wherein, The bottom wall has a first end and a second end opposite the first end, and the top wall extends upwardly from and is coupled to the first and second ends of the bottom wall to form a finger-receiving region between the top wall and the bottom wall.

8. The adaptive syringe plunger of claim 2, wherein, The body includes a side wall extending between and interconnecting the top wall and the bottom wall of the body, and at least a portion of the side wall is formed to include a finger-receiving channel sized to receive a finger of the syringe user.

9. The adaptive syringe plunger of claim 2, wherein, The bore in the attachment stem of at least one of the plurality of syringe interface devices is formed to include threads to mate with the second end of the plunger to removably couple at least one of the plurality of syringe interface devices to the plunger.

10. The adaptive syringe plunger of claim 2, wherein, At least a portion of the attachment stem is formed of an elastomeric material configured to deform to removably couple at least one of the plurality of syringe interface devices to the plunger.

11. The adaptive syringe plunger of claim 2, wherein, The attachment stem is formed to include a first attachment portion having a tab extending radially therefrom into a tab-receiving aperture formed in a second attachment portion to couple the first attachment portion and the second attachment portion together, the first attachment portion and the second attachment portion of the attachment stem cooperate to form the aperture to receive the plunger, and the first attachment portion and the second attachment portion are detachably coupled together to detachably couple at least one of the plurality of syringe interface devices to the plunger.

12. The adaptive syringe plunger of claim 1, wherein, At least one of the plurality of syringe interface devices includes a hook-and-loop fastener formed to include a slit extending therethrough and sized to receive the second end of the plunger to detachably couple at least one of the plurality of syringe interface devices to the plunger.

13. The adaptive syringe plunger of claim 1, wherein, At least one of the plurality of syringe interface devices includes a body and an attachment stem formed to receive the second end of the plunger, the body includes a top wall and a bottom wall opposite the top wall, and the attachment stem extends downwardly from the bottom wall of the body and is aligned with the plunger axis, the bottom wall has a first end and a second end opposite the first end, and the top wall extends upwardly from and is coupled to the first end and the second end of the bottom wall to form a finger-receiving area therebetween; wherein the attachment stem includes a first attachment arm extending downwardly from the body and a second attachment arm extending downwardly from the body and radially spaced from the first attachment arm, each of the first attachment arm and the second attachment arm is formed to include a tab extending radially inwardly from a bottom edge of each of the first attachment arm and the second attachment arm, each of the tabs is configured to snap under the second end of the plunger to detachably couple at least one of the plurality of syringe interface devices to the plunger.

14. The adaptive syringe plunger of claim 1, wherein, At least one of the plurality of syringe interface devices includes a body, a first attachment arm extending downwardly from the body, and a second attachment arm extending downwardly from the body and radially spaced from the first attachment arm; wherein a tensioning unit extends around the first attachment arm, the second attachment arm, and the plunger to detachably couple the plunger to at least one of the plurality of syringe interface devices.

15. The adaptive syringe plunger of claim 1, wherein, At least one of the plurality of syringe interface devices includes a body, a first attachment arm extending downwardly from the body, and a second attachment arm extending downwardly from the body and radially spaced from the first attachment arm; wherein the first attachment arm and the second attachment arm are configured to wrap around the plunger to detachably couple at least one of the plurality of syringe interface devices to the plunger.

16. The adaptive syringe plunger of claim 1, wherein, The plunger includes a plunger shaft extending between and interconnecting a first end and a second end of the plunger and having a first diameter, the second end of the plunger is a thumb pad having a second diameter, and the second diameter is greater than the first diameter.

17. The adaptive syringe plunger of claim 16, wherein, At least one of the plurality of syringe interface devices includes a hollow body and an attachment stem extending downwardly from the hollow body, the attachment stem having a third diameter that is less than the second diameter of the thumb pad and is configured to deform to accommodate the thumb pad within the hollow body through the attachment stem.

18. The adaptive syringe plunger of claim 17, wherein, The hollow body is triangular with three corners circumferentially spaced relative to the plunger axis and a top wall of the hollow body is curved downwardly at each of the three corners such that an apex of the hollow body is aligned with the plunger axis.

19. The adaptive syringe plunger of claim 17, wherein, The hollow body is cylindrical and a top wall of the hollow body is flat.

20. The adaptive syringe plunger of claim 17, wherein, At least a portion of the attachment stem is formed of an elastomeric material and the elastomeric material is configured to deform to detachably couple the syringe interface device to the plunger.

Images