Vacuum syringe plunger clamp

Abstract

A pre-charge accessory for a vacuum injector prevents air aspirated from the IV kit and drawn into the vacuum injector from being released into the environment or returned to the IV kit. The pre-charge accessory is coupled to the vacuum injector and prevents the injector plunger from re-entering the injector barrel. One embodiment of the pre-charge accessory includes an arm fitted inside the barrel and pulled distally until the arm is released from the barrel. Once released, the arm cannot re-enter the barrel, preventing distal movement of the plunger relative to the barrel. Another embodiment of the pre-charge accessory includes a key engaging with a notch in an improved plunger. The improved plunger can rotate between a free position and a locked position; in the free position, the plunger can reciprocate within the barrel; in the locked position, the notch aligns with the key and prevents translation of the improved plunger.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to U.S. Application No. 19 / 041,758, entitled "VACUUM SYRINGE PLUNGER CLIP", filed January 30, 2025. The entire contents of U.S. Application No. 19 / 041,758 are incorporated herein by reference. Technical Field

[0003] This application generally relates to a system and method for pre-filling intravenous lines, and more specifically to a vacuum injector and vacuum injector accessories. Background Technology

[0004] Medical treatments typically involve infusing a patient with medical fluids (such as saline solution or liquid medications) using an intravenous (IV) catheter. This IV catheter is connected to a fluid source (such as a syringe) via an arrangement of flexible tubing and fittings, often referred to as an "IV kit." Some configurations of IV kits may have extended tubing lengths, for example, exceeding 6 feet. Air bubbles becoming trapped within the IV kit and fittings are quite common.

[0005] Therefore, IV lines need to be pre-filled to remove air bubbles before being connected to the infusion container containing medical fluids. This can be done by using a vacuum injector to remove air from the infusion container. However, in cases where the medical fluid is a hazardous drug (e.g., chemotherapy drugs), healthcare providers administering such drugs may be at risk of exposure to these drugs, which poses a significant danger in the healthcare setting. Unintentional chemotherapy exposure can affect the nervous system, damage the reproductive system, and increase the risk of future blood cancers. Summary of the Invention

[0006] IV kits containing medications to be delivered to patients must first be prefilled to remove air from the IV kit. Prefilling into a waste disposal container in cases where the medication is harmful to caregivers (e.g., chemotherapy drugs) can expose caregivers to hazardous drugs. Even prefilling with a ventilator cap can be dangerous and expose caregivers to contaminated air. To reduce the risk of healthcare providers being exposed to hazardous chemicals, a tool is needed for prefilling hazardous medications in a closed environment. A vacuum injector can be attached to the IV kit (e.g., an extension tube, fluid connector, or the IV bag itself) to draw air out of the IV kit to prefill it before medication delivery to the patient. A prefilling attachment can be clipped onto the vacuum injector to prevent contaminated air from leaking out and to prevent caregiver exposure to hazardous chemicals.

[0007] Some embodiments of this disclosure relate to a pre-charge accessory for a vacuum injector, the pre-charge accessory comprising: a proximal cap including one or more engagement features configured to engage with a plunger flange of the vacuum injector; and a stop extending distally from at least one of the engagement features. Each stop includes: an alignment section projecting from the corresponding engagement feature and extending radially inward, the alignment section being configured to align the stop with a recess in the plunger of the vacuum injector; an arm extending distally from the alignment section, the arm being configured to extend along the recess and fit within the barrel of the vacuum injector and radially outwardly supported against the barrel; and a lip projecting from a distal portion of the arm, the lip being configured to restrict re-entry of the plunger into the barrel after the plunger and the stop have been withdrawn from the barrel.

[0008] In some embodiments, the proximal cap is flat and round.

[0009] In some embodiments, one or more engagement features are positioned on the outer periphery of the proximal cap. Optionally, one or more engagement features are configured to snap onto the plunger flange. Optionally, each of the one or more engagement features is at least about 90° away from the adjacent engagement feature.

[0010] In some embodiments, the angle between the alignment segment and the arm is between approximately 150° and 160°.

[0011] In some embodiments, the arm of each stop further includes at least one sub-arm. Each sub-arm extends distally from the arm and radially away from the arm, and has a corresponding lip projecting from the distal portion of the respective additional arm. Furthermore, each arm is configured to be compressed onto the arm to fit within the barrel of the vacuum injector and radially outwardly supported against the barrel. Additionally, each corresponding lip is configured to restrict re-entry of the plunger into the barrel. Optionally, each sub-arm is positioned at different locations along the respective arm to accommodate different volumes of fluid within the barrel. Optionally, each sub-arm extends distally from the arm and radially away from the arm at an angle between approximately 155° and 165°.

[0012] In some embodiments, the lip includes a beveled edge and a flat end, the flat end being configured to abut a proximal end of the barrel when the beveled edge is withdrawn from the barrel, so as to restrict the plunger from re-entering the barrel after the plunger and stop have been withdrawn from the barrel. Optionally, the flat end is perpendicular to the arm.

[0013] Some embodiments of this disclosure relate to a pre-charge accessory for a vacuum injector, the pre-charge accessory comprising: a proximal cap including one or more engagement features configured to engage with a plunger flange of the vacuum injector; and one or more stops including one or more arms, each of the arms being configured to extend along a recess in the plunger of the vacuum injector and to radially outward support the barrel of the vacuum injector while the plunger and one or more stops are located within the barrel. Furthermore, the distal portion of each arm includes a lip configured to restrict re-entry of the plunger into the barrel after the plunger and stops have been withdrawn from the barrel.

[0014] In some embodiments, each of the one or more stops includes three arms. Optionally, each of the one or more stops extends distally from one of the engagement features.

[0015] In some embodiments, the lip includes a sloping edge and a flat end, the flat end being configured to abut a proximal end of the cylinder when the sloping edge is withdrawn from the cylinder, so as to restrict the plunger from re-entering the cylinder after the plunger and stop have been withdrawn from the cylinder.

[0016] Another embodiment of this disclosure relates to a pre-charge system for a vacuum injector, the pre-charge system comprising: a pre-charge attachment configured to be coupled to a barrel flange of the vacuum injector and including one or more keys; and a plunger including one or more notches, the plunger being configured to rotate relative to the pre-charge attachment between a free position and a locked position, wherein in the free position the plunger is configured to reciprocate within the barrel, and in the locked position the plunger is not capable of reciprocating within the barrel. In the free position, one or more notches are not aligned with any of the one or more keys, and in the locked position at least one of the one or more notches is aligned with at least one of the one or more keys.

[0017] In some embodiments, the precharge attachment is configured to at least partially cover the barrel flange and surround the proximal barrel opening of the vacuum injector, and one or more keys protrude from the precharge attachment and are configured to extend partially over the proximal opening. In some embodiments, the precharge attachment includes one or more engagement features configured to snap onto the barrel flange.

[0018] In some embodiments, each of one or more keys protrudes radially inward, at least as deep as each of one or more notches, and wider than each of one or more notches.

[0019] In some embodiments, one or more notches are located at different positions along the length of the plunger, wherein the different positions along the length of the plunger are configured to correspond to different volumes of fluid inside the barrel of the vacuum injector.

[0020] Further features and advantages of this subject matter will be set forth in the description which follows, and some features and advantages will be apparent from the description or may be learned by practice of the subject matter. The advantages of this subject matter will be realized and obtained through the written description and embodiments thereof, as well as the structures specifically pointed out in the accompanying drawings.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative, and are intended to provide further explanation of the subject matter. Attached Figure Description

[0022] Various features of illustrative embodiments of the present invention are described below with reference to the accompanying drawings. The illustrated embodiments are intended to illustrate the invention, and not to limit it. The drawings include the following figures:

[0023] Figure 1 A vacuum injector for removing air from an IV kit is shown according to some embodiments disclosed herein.

[0024] Figure 2 A first embodiment of a pre-charge accessory coupled to a vacuum injector according to some embodiments disclosed herein is shown.

[0025] Figure 3A and Figure 3B A perspective view and a front view of a first embodiment of a precharged accessory according to some embodiments disclosed herein are shown.

[0026] Figure 4 A second embodiment of a pre-charge accessory coupled to a vacuum injector according to some embodiments disclosed herein is shown.

[0027] Figure 5A and Figure 5B A perspective view of a second embodiment of a precharged accessory according to some embodiments disclosed herein is shown. Detailed Implementation

[0028] The following detailed description sets forth numerous specific details to provide a full understanding of the subject matter. The subject matter can be practiced without these specific details. In other instances, well-known structures and techniques are not shown in detail so as not to obscure the subject matter.

[0029] Furthermore, while this specification sets forth specific details of various embodiments, it should be understood that this specification is illustrative only and should not be construed as restrictive in any way. Additionally, it is conceivable that although specific embodiments of this disclosure may be disclosed or illustrated in the context of IV kits, such embodiments may be used in other fluid transport systems. Moreover, various applications and modifications of such embodiments (which may be conceived by those skilled in the art) are also covered by the general concepts described herein.

[0030] Pre-filling the IV kit is an important step before administering chemotherapy drugs intravenously to a patient. A vacuum injector can be attached to the IV kit to remove air from the IV bag. A caregiver can pull the plunger of the vacuum injector proximally to remove air from the IV bag and draw air into the plunger's barrel. However, using a typical injector to pre-fill the IV kit has disadvantages. For example, caregivers can easily and accidentally release contaminated air into the environment by accidentally pushing the plunger. It is also possible that the vacuum created inside the injector barrel can exert a distal force on the plunger, pulling it distally and releasing contaminated air into the environment. The following apparatus and method provide design modifications to overcome the aforementioned problems.

[0031] Now refer to the attached diagram, Figure 1 A vacuum injector for removing air from an IV kit, according to some embodiments disclosed herein, is shown. Figure 1 In this device, IV bag 1 contains medication 2. Before a caregiver can deliver medication 2 to the patient, air 4 must be removed from IV bag 1. This can be done by connecting a vacuum injector 10 to port 6 in IV bag 1 via IV tubing or extension tube 8 and drawing air 4 from IV bag 1 into the barrel 30 of vacuum injector 10. Alternatively, this can be done by connecting vacuum injector 10 directly to port 6 without IV tubing or extension tube 8.

[0032] When the vacuum injector 10 is in the empty configuration, it is connected to the IV bag 1. In this configuration, most of the plunger 20 of the vacuum injector 10 is located within the barrel 30. Additionally, when the vacuum injector 10 is in the empty configuration, the sealing portion 28 of the plunger 20 can be located at the furthest end of the barrel 30. After the vacuum injector 10 is connected to the IV bag 1, a caregiver can draw air 4 from the IV bag 1 and into the barrel 30 of the vacuum injector by pulling the plunger flange 22 of the plunger 20 distally. To ensure all air 4 is removed from the IV bag 1, the caregiver can also draw some medication 2 into the barrel 30 of the vacuum injector 10.

[0033] In cases where drug 2 is harmful (such as when using chemotherapy drugs), caregivers should avoid exposure to air 4 and drug 2. This can be achieved through pre-filled accessories, which will be described in more detail below.

[0034] Figure 2 A first embodiment of a pre-charge accessory coupled to a vacuum injector according to some embodiments disclosed herein is shown. The pre-charge accessory 100 can snap, clamp, or otherwise engage with the plunger 20 of the vacuum injector 10. Furthermore, the pre-charge accessory 100 is designed to attach to any standard injector.

[0035] The pre-fill accessory 100 is configured to hold the plunger 20 in place relative to the cylinder 30 after air 4 and / or medication 2 have been aspirated into the cylinder 30. Specifically, the pre-fill accessory 100 prevents the plunger 20 from re-entering the cylinder 30 and prevents the release of air 4 and / or medication 2 from the vacuum injector 10. Because the pre-fill accessory 100 holds the plunger 20 in place, caregivers can lower the vacuum injector 10 without concern for exposure to harmful chemicals. Therefore, the pre-fill accessory 100 makes pre-filling IV bags 1 more convenient for caregivers compared to conventional methods.

[0036] The pre-charge accessory 100 has a proximal cap 102 configured to attach to the plunger flange 22 of the plunger 20. The proximal cap 102 is generally flat and has the same shape as the plunger flange 22, so that the pre-charge accessory 100 does not inconveniently increase the size of the vacuum injector 100. Figure 2 In this embodiment, the proximal cap 102 is a flattened circle, flush with the also circular plunger flange 22. In some embodiments, the proximal cap 102 is elliptical. Other shapes are also possible.

[0037] The pre-charge accessory 100 has one or more engagement features 104 positioned along the outer periphery of the proximal cap 102. The engagement features 104 are configured to snap-fit ​​the proximal cap 102 into the plunger flange 22. Figure 2 In the illustrated embodiment, each engagement feature 104 is an L-shaped support that can be clamped onto the outer edge of the plunger flange 22. Other shapes for the engagement features 104 are also possible. Figure 2 In the illustrated embodiment, the proximal cap 102 has only three engagement features 104. This is in Figure 3A and Figure 3B As shown in the diagram, which will be discussed in more detail below. In some embodiments, the proximal cap 102 has only one engagement feature 104. In other embodiments, the proximal cap 102 has two engagement features 104. Optionally, the proximal cap 102 has more than three engagement features 104.

[0038] Engaging feature 104 is positioned on the proximal cap 102 such that engaging feature 104 does not interfere with the plunger 20 of the vacuum injector. The plunger 20 shown in this disclosure has a plus-shaped cross-section consisting of four walls and four recesses 24. This allows for… Figure 1 and Figure 4 as well as Figure 2 I saw it in [the text]. Figure 2 In this configuration, each of the engagement features 104 is at least 90° away from the adjacent engagement feature 104, such that each engagement feature 104 is aligned with the recess 24 of the plunger 20.

[0039] At least one of the engagement features 104 is part of the stop 106. Figure 2 In the engagement feature 104, two of the stops extend into the stops 106. The stops 106 extend distally away from the proximal cap 102 and are configured to fit within the recess 24 of the plunger 20. Each stop 106 has an alignment segment 108 extending radially inward from the engagement feature 104. That is, when the pre-charge accessory 100 is coupled to the plunger 20 of the vacuum injector 100, each alignment segment 108 extends from the engagement feature 104 toward the recess 24 of the plunger 20. Thus, each alignment segment 108 facilitates the alignment and storage of each stop 106 within the corresponding recess 24 of the plunger 20. When the plunger 20 is located inside the barrel 30, each stop 106 is stored within the recess 24 of the plunger 20.

[0040] Each stop 106 also has at least one arm 110. Each arm 110 has a lip 116 configured to prevent the plunger 20 from re-entering the cylinder 30 after the plunger 20 and the stop 106 have been withdrawn from the cylinder 30. Specifically, after the lip 116 is outside the cylinder 30, the distal end of the lip 116 will abut the proximal end 32 of the cylinder 30 and resist any distal force applied to the plunger. Arms 110 and lips 116 are referenced below. Figure 3A and Figure 3B To describe in more detail.

[0041] Figure 3A and Figure 3B A perspective view and a front view of a first embodiment of a precharged accessory according to some embodiments disclosed herein are shown. References Figure 3A The first arm 110A is a long, flat rectangular panel (e.g., a vertical cantilever supported by the distal end of the alignment section 108 at its proximal end) extending distally from the distal end of the alignment section 108. Figure 3BAs shown, the first arm 110 extends from the alignment section 108 at an angle A1 of approximately 152.5°. In some embodiments, the angle A1 between the first arm 110 and the alignment section 108 is between approximately 147° and 157°. In other embodiments, the angle A1 is between approximately 142° and 162°.

[0042] As described above and as Figure 3A As shown, the first arm 110A has a lip 116A positioned at the distal portion of the first arm 110A. Each lip 116 protrudes from the distal portion of the corresponding arm 110 and includes a triangular shape (as shown) formed by an inclined edge 118 and a flat end 120. Figure 3B (As shown). The beveled edge 118 protrudes away from the arm 110 at an angle A2 of approximately 157°. In some embodiments, the angle A2 between the beveled edge 118 and the arm 110 is between approximately 152° and 162°. In other embodiments, the angle A2 is between approximately 147° and 167°. The flat end 120 is generally transverse to the arm 110.

[0043] like Figure 2 As shown, the first arm 110A is configured to be pressed into the recess 24 of the plunger 20. When the plunger 20 is inside the barrel 30 of the vacuum injector 10, the first arm 110A (specifically, the lip 116A) is supported against the inner wall of the barrel 30 because the first arm 110A is radially outwardly biased. Because the first arm 110A is pressed against the inner wall of the barrel 30, when the nurse removes the plunger 20 from the barrel 30 (and thus the pre-charge accessory 100 and the stop 106 from the barrel), the proximal end 32 of the barrel 30 slides against the inclined edge 118 of the lip 116A until the lip 116A is completely removed from the barrel 30. At this point, if the nurse stops pulling the plunger 20 proximally, the proximal end 32 of the barrel 30 is adjacent to the flat end 120 of the lip 116A. As mentioned above regarding Figure 2 In this position, if a caregiver pushes the plunger 20 distally, or if the vacuum inside the cylinder 30 applies a distal force to the plunger 20, the pre-charge attachment 100 will prevent the plunger from moving because the flat end 120 presses against the proximal end 32 of the cylinder 30.

[0044] In some embodiments, the stop 106 may have an additional arm 110. In the illustrated embodiment, the additional arm 110 is smaller than the first arm 110A and may be referred to as a sub-arm. (See reference...) Figure 3AThe stop 106 has a second arm 110B and a third arm 110C (or sub-arms 110B, 110C) projecting from the first arm 110A. Optionally, the stop 106 has only two arms 110. Optionally, the stop 106 has more than three arms 110. As shown, the second arm 110B and the third arm 110C are flat rectangular panels shorter than the first arm 110A. In some embodiments, the second arm 110B and the third arm 110C are approximately one-third the length of the first arm 110A. In other embodiments, the second arm 110B has a different length than the third arm 110C.

[0045] Each of the second arm 110B and the third arm 110C extends distally from the first arm 110A and radially away from the first arm. Specifically, the second arm 110B and the third arm 110C each extend away from the first arm 110A at an angle A3 of approximately 159.5°. In some embodiments, the angle A3 between each of the second arm 110B and the third arm 110C and the first arm 110 is between approximately 154° and 164°. In other embodiments, the angle A3 is between approximately 149° and 169°.

[0046] Each of the second arm 110B and the third arm 110C has a lip 116B, 116C located at the distal portion of the second arm 110B and the third arm 110C, respectively. As described above, each lip 116 (including 116A, 116B, and 116C) includes a triangular projection having a sloping edge 118 generally facing proximal and a flat edge 120 generally facing distal. The sloping edge 118 forms an angle A2 with the arm 110, and the flat edge 120 is generally perpendicular to the arm 110.

[0047] Similar to the first arm 110A, when the plunger 20 is inside the cylinder 30, each of the second arm 110B and the third arm 110C can be pushed radially inward to fit into the recess 24 of the plunger 20. Likewise, when the second arm 110B and the third arm 110C are inside the cylinder 30, they are biased radially outward, and the lips 116B, 116C press against the inner wall of the cylinder 30. Because the second arm 110B and the third arm 110C are radially outwardly supported against the cylinder 30, for example, when the second arm 110B is withdrawn from the cylinder 30, the proximal end 32 of the cylinder 30 slides against the inclined edge 118 of the lip 116B until the lip 116B is completely withdrawn from the cylinder. At this point, if a caregiver attempts to push the plunger 20 distally, or if the vacuum created inside the cylinder 30 exerts a distal suction force on the plunger 20, the flat end 120 of the lip 116B will prevent the plunger 20 from sliding back into the cylinder 30. The same applies to the third arm 110C and the corresponding lip 110C.

[0048] Furthermore, each of the second arm 110B and the third arm 110C is positioned at a different location along the length of the first arm 110A. For example, the second arm 110B may be located approximately in the middle of the first arm 110A, while the third arm 110C is located near the proximal end of the first arm 110A. Other locations are also possible. These different locations are configured to contain different volumes of air and drug (e.g., ...) within the barrel 30 of the vacuum injector 10. Figure 1 (Air 4 and drug 2 in the cylinder). In other words, when different volumes of fluid (e.g., air 4 and drug 2) are present inside the cylinder 30 of the vacuum injector 10, each of the different arms 110 can be used to prevent the plunger 20 from re-entering back into the cylinder 30.

[0049] This application also discloses a method for using a vacuum injector 10 having a pre-filled accessory 100. These arrangements are referenced in this application. Figures 1-3B The process is described below. First, the pre-charge accessory 100 is clamped onto the vacuum injector 10. Specifically, the proximal cap 102 of the pre-charge accessory is snapped onto the plunger flange 22 of the plunger 20 of the vacuum injector 10. The plunger 20 is pushed distally into the barrel 30, and the stop 106 of the pre-charge accessory is compressed to fit within the recess 24 of the plunger 20. The plunger 20 is pushed distally until the seal 28 is located at the farthest end of the barrel 30.

[0050] Next, the vacuum injector 10 with the pre-fill accessory 100 is attached to the IV bag 1 so that the IV bag 1 can be pre-filled. The plunger 20 is pulled proximally to draw air 4 (and some medication 2) from the IV bag 1 and into the barrel 30 of the vacuum injector 10. As the plunger 20 is pulled proximally, the lip 116 on the first set of arms 110 rests against the inner surface of the barrel 30. (Each "set" of arms 110 includes all arms 110 equidistant from the proximal cap 102. Here, the first set of arms 110 includes all arms 110 furthest from the proximal cap 102.) When the distal end of the inclined edge 118 of the lip 116 of the first set of arms 110 passes the critical position of the proximal end 32 of the barrel 30, the lip 116 of the first set of arms 110 ejects from the barrel 30, and the portion of the arm 110 located distal to the lip 116 rests against the inner surface of the barrel 30. The flat end 120 of the lip 116 prevents the plunger from sliding back into the cylinder 30, which prevents air 4 and drug 2 from being released from the vacuum inside the cylinder 30.

[0051] With multiple sets of arms 110 present on each stop 106, the plunger 20 can be pulled proximally to remove the next set of arms 110 from the cylinder 30 and draw a larger volume of air 4 and medication 2 from the IV bag 1 into the cylinder 30. When the plunger 20 is withdrawn proximally to remove the next set of arms 110 from the cylinder 30, the portion of the arm 110 distal to the lip 116 ejects from the cylinder 30. As described above with respect to the first set of arms 110, the flat end 120 of the lip 116 prevents the plunger 20 from re-entering the cylinder 30 at this point.

[0052] Each arm 110 corresponds to a different volume of fluid (e.g., air 4 and medication 2) inside the barrel 30 of the vacuum injector 10. Therefore, a caregiver using the vacuum injector 10 and the pre-filled accessory 100 can identify the volume of fluid inside the barrel 30 by listening to the sound of the lip edge 116 popping out of the barrel 30 or by feeling the lip edge 116 being withdrawn from the barrel.

[0053] Figure 4 A second embodiment of a pre-charge accessory coupled to a vacuum injector according to some embodiments disclosed herein is shown. The pre-charge accessory 200 may snap, clamp, or otherwise coupled to the barrel flange 36 of the vacuum injector 10. The pre-charge accessory 200 is designed for use with an improved plunger 20'. Both the pre-charge accessory 200 and the improved plunger 20' are designed for use with any standard barrel 30 of the vacuum injector 10.

[0054] The vacuum injector 10 has an improved plunger 20'. The improved plunger 20' has a plus-shaped cross-section consisting of four walls 25 and four recesses. (See also...) Figure 4 As shown, the improved plunger 20' may have a notch 26 in one of the walls 25. The notch 26 in the wall 25 of the improved plunger 20' may be removably connected to a key 202 in the precharge accessory 200. When the notch 26 is not connected to the key 202, the improved plunger 20' and the precharge accessory 200 are in a free position. In the free position, the improved plunger 20' can reciprocate within the barrel 30. When the notch 26 is connected to the key 202, the improved plunger 20' and the precharge accessory 200 are in a locked position. In the locked position, the improved plunger 20' cannot reciprocate within the barrel 30 of the vacuum injector 10.

[0055] By misaligning and aligning the notch 26 with the key 202, the modified plunger 20' can rotate relative to the precharge attachment 200 between a free position and a locked position. When a caregiver applies an IV kit (e.g., ...), Figure 1When the IV bag 1) shown is being pre-filled, the caregiver can rotate the modified plunger 20' to the free position to withdraw the modified plunger 20' and aspirate air from the IV kit. When the caregiver has finished removing air from the IV kit (or needs to pause while pre-filling the IV kit), the caregiver can rotate the modified plunger 20' to the locked position to prevent the modified plunger 20' from re-entering the barrel 30 of the vacuum injector 10. Therefore, the combination of the modified plunger 20' and the pre-fill accessory can be used for the same purpose as the pre-fill accessory 100 described above.

[0056] In some embodiments, the improved plunger 20' has a plurality of notches 26. The notches 26 can be located in different walls 25 at the same distance from the plunger flange (i.e., at the same "level"). The notches 26 can also be located in the same wall 25 or in different walls 25 at different distances from the plunger flange (i.e., at different levels). The notches 26 located at different distances from the plunger flange will correspond to different volumes of fluid inside the cylinder.

[0057] Figure 5A and Figure 5B A perspective view of a second embodiment of the precharged accessory according to some embodiments disclosed herein is shown. Figure 5A As shown, the pre-charge accessory 200 is clamped onto the barrel flange 36 of the vacuum injector and covers most of the barrel flange 36. Figure 5A and Figure 5B The pre-charge attachment 200 is approximately U-shaped, such that it surrounds the proximal opening 34 of the vacuum injector barrel, thereby improving the plunger (i.e., Figure 4 The modified plunger 20' shown can enter the barrel through the proximal opening 34. Optionally, the pre-charge attachment 200 can completely cover the barrel flange 36 and has a central hole that exposes the proximal opening 34 of the vacuum barrel injector.

[0058] The pre-charge accessory 200 has a key 202 that engages with a notch 26 in the improved syringe. Figure 5A and Figure 5B In this design, key 202 is a generally rectangular protrusion that extends radially inward from the base of the U-shaped opening of the pre-charge attachment 200. Key 202 is slightly wider and thinner than recess 26, and almost as deep as recess 26, such that when the modified plunger rotates relative to the vacuum injector barrel, key 202 can slide through and engage recess 26 to prevent movement of the modified plunger into and out of the barrel when the modified injector is in the locked position. Other shapes for key 202 are also possible. For example, key 202 can be semi-circular or trapezoidal. A wider key 202 makes it easier to rotate the modified injector to the locked position compared to a narrower key, which is more difficult to align with recess 26.

[0059] In some embodiments, the precharge attachment 200 has a plurality of keys 202. Optionally, the plurality of keys 202 may each be configured to engage with a notch 26 at each level along the notch 26 of the improved plunger. This configuration will make it easier for a caregiver to rotate the improved plunger into the locked position because more keys 202 are available for alignment with any given notch 26. Optionally, the plurality of keys 202 may each be configured to align with different notches 26 in different walls 25 at a single level along the notch 26 of the improved plunger. This will increase the resistance to moving the improved plunger distally back into the cylinder. Each of the keys 202 in the precharge attachment will align with a notch 26 in the improved plunger. For example, in the case where the improved plunger is designed such that the walls 25 intersect to form a 90° angle, the keys 202 are spaced 90° apart from adjacent keys 202, such that each key 202 aligns with a notch 26.

[0060] The pre-charge accessory 200 also includes an engagement feature 204 projecting distally from the outer periphery of the pre-charge accessory 200. The engagement feature 204 is configured to clamp onto the barrel flange 36 and secure the pre-charge accessory to the vacuum injector. The engagement feature 204 is an L-shaped support, long enough to clamp onto the barrel flange 36 of a standard injector.

[0061] This application also discloses a method for using a vacuum injector 10 having a pre-filled accessory 200. These steps are referenced in this application. Figure 1 and Figures 4-5B The process is described below. First, align the key 202 (or multiple keys 202) of the precharge attachment 200 with the notch 26 (or multiple notches 26) of the modified plunger 20'. Next, slide the distal end (e.g., the seal 28) of the modified plunger 20' into the barrel 30 of the vacuum injector 10, and clamp the precharge attachment 200 onto the barrel flange 36 of the barrel 30 via the engagement feature 204 of the precharge attachment 200. Rotate the modified plunger 20' to a free position (i.e., rotate the notch 26 out of the key 202), and push the modified plunger 20' distally inside the barrel 30 until the seal 28 is located at the distal end of the barrel 30.

[0062] Next, the vacuum injector 10, equipped with the pre-fill accessory 200 and the modified plunger 20', is connected to the IV bag 1 so that the IV bag 1 can be pre-filled. The modified plunger 20', still in its free position, is pulled proximally to draw air 4 (and some medication 2) out of the IV bag 1 and into the barrel 30 of the vacuum injector 10. When all air 4 has been drawn out of the IV bag 1 (or when the caregiver needs to pause pre-filling), the modified plunger 20' can be rotated so that the notch 26 on the modified plunger 20' aligns with the key 202 in the pre-fill accessory 200. The key 202 of the pre-fill accessory 200 restricts the movement of the modified plunger 20', preventing it from reciprocating within the barrel 30 of the vacuum injector 10. This prevents the fluid (i.e., air 4 and medication 2) inside the barrel 30 from being released from the vacuum chamber inside the barrel 30 of the vacuum injector 10 and prevents contamination of the surrounding environment.

[0063] With multiple horizontal notches 26 on the modified plunger 20', the modified plunger 20' can rotate back to the free position and continue to be pulled proximally to draw out a larger volume of air 4 and drug 2 from the IV bag 1. When pre-filling is complete, the modified plunger 20' can rotate back to the locked position, so that the notch 26 at the next level engages with the key 202 to again prevent the modified plunger 20' from re-entering the cylinder 30.

[0064] Each level notch 26 corresponds to a different volume of fluid inside the barrel 30 of the vacuum injector 10. Therefore, a caregiver using the vacuum injector 10 with the pre-fill attachment 200 and the modified plunger 20' can visually identify which notch 26 is connected to the key 202 to determine the volume of fluid inside the barrel 30.

[0065] This topic technology is explained as a clause.

[0066] For example, the subject matter technique is illustrated by the various aspects described below. For convenience, examples of the various aspects of the subject matter technique are described as numbered articles (1, 2, 3, etc.). These are provided as examples and do not limit the subject matter technique. It should be noted that any subordinate articles can be combined in any combination and placed in corresponding independent articles (e.g., article 1, article 9, or article 16). Other articles can be presented in a similar manner.

[0067] Clause 1. A pre-charge accessory for a vacuum injector, the pre-charge accessory comprising: (a) a proximal cap including one or more engagement features configured to engage with a plunger flange of the vacuum injector; and (b) a stop extending distally from at least one of the one or more engagement features, wherein each stop includes: an alignment section projecting from the corresponding engagement feature and extending radially inward, the alignment section being configured to align the stop with a recess in the plunger of the vacuum injector; an arm extending distally from the alignment section, the arm being configured to extend along the recess and fit into the barrel of the vacuum injector and radially outwardly supported against the barrel; and a lip projecting from a distal portion of the arm, the lip being configured to restrict the plunger from re-entering the barrel after the plunger and the stop have been withdrawn from the barrel.

[0068] Clause 2. The pre-charge accessory according to Clause 1, wherein the proximal cap is flat and round.

[0069] Clause 3. The pre-filled accessory according to Clause 1, wherein the one or more engagement features are positioned on the outer periphery of the proximal cap.

[0070] Clause 4. The pre-charge accessory according to Clause 1, wherein the one or more engagement features are configured to snap onto the plunger flange.

[0071] Clause 5. The pre-charged accessory according to Clause 1, wherein each of the one or more engagement features is at least about 90° away from the adjacent engagement feature.

[0072] Clause 6. The pre-charge accessory according to Clause 1, wherein the angle between the alignment section and the arm is between approximately 150° and 160°.

[0073] Clause 7. The pre-charge accessory according to Clause 1, wherein the arm of each stop further includes at least one sub-arm, wherein each sub-arm extends distally from the arm and radially away from the arm, and has a corresponding lip protruding from the distal portion of the respective additional arm, wherein each sub-arm is configured to be compressed onto the arm for fitting into the barrel of the vacuum injector, wherein each sub-arm is configured to radially outwardly support against the barrel, and wherein each corresponding lip is configured to restrict the plunger from re-entering the barrel.

[0074] Clause 8. The pre-filled accessory according to Clause 7, wherein each sub-arm is positioned at a different location along the corresponding arm to accommodate different volumes of fluid inside the cylinder.

[0075] Clause 9. The pre-charged accessory according to Clause 7, wherein each sub-arm extends distally from the arm at an angle between approximately 155° and 165° and extends radially away from the arm.

[0076] Clause 10. The pre-charge accessory according to Clause 1, wherein the lip includes a sloping edge and a flat end, the flat end being configured to abut a proximal end of the cylinder when the sloping edge is withdrawn from the cylinder, so as to restrict the plunger from re-entering the cylinder after the plunger and the stop have been withdrawn from the cylinder.

[0077] Clause 11. The pre-charge accessory according to Clause 10, wherein the flat end is perpendicular to the arm.

[0078] Clause 12. A pre-charge accessory for a vacuum injector, the pre-charge accessory comprising:

[0079] A proximal cap includes one or more engagement features configured to engage with the plunger flange of the vacuum injector; and one or more stops including one or more arms, each of which is configured to extend along a recess in the plunger of the vacuum injector and radially outwardly support the barrel of the vacuum injector while the plunger and the one or more stops are located inside the barrel, wherein the distal portion of each arm includes a lip configured to restrict the plunger from re-entering the barrel after the plunger and the stops have been withdrawn from the barrel.

[0080] Clause 13. The pre-charge accessory according to Clause 12, wherein each of the one or more stops comprises three arms.

[0081] Clause 14. The pre-charge accessory according to Clause 12, wherein each of the one or more stops extends distally from the engagement feature of the one or more engagement features.

[0082] Clause 15. The pre-charge accessory according to Clause 12, wherein the lip includes a sloping edge and a flat end, the flat end being configured to abut a proximal end of the cylinder when the sloping edge is withdrawn from the cylinder, so as to restrict the plunger from re-entering the cylinder after the plunger and the stop have been withdrawn from the cylinder.

[0083] Clause 16. A pre-filling system for a vacuum injector, the pre-filling system comprising:

[0084] A pre-charge attachment configured to engage with the barrel flange of the vacuum injector and including one or more keys; and a plunger including one or more notches, the plunger being configured to rotate relative to the pre-charge attachment between a free position and a locked position, wherein in the free position the plunger is configured to reciprocate within the barrel, and in the locked position the plunger is unable to reciprocate within the barrel, wherein in the free position the one or more notches are not aligned with any of the one or more keys, and wherein in the locked position at least one of the one or more notches is aligned with at least one of the one or more keys.

[0085] Clause 17. The pre-charge system according to Clause 16, wherein the pre-charge attachment is configured to at least partially cover the barrel flange and surround the proximal barrel opening of the vacuum injector, and the one or more keys protrude from the pre-charge attachment and are configured to extend partially over the proximal opening.

[0086] Clause 18. The pre-charge system according to Clause 16, wherein the pre-charge accessory includes one or more engagement features configured to snap onto the cylindrical flange.

[0087] Clause 19. The pre-charge system according to Clause 16, wherein each of the one or more keys protrudes radially inward, is at least as deep as each of the one or more recesses, and is wider than each of the one or more recesses.

[0088] Clause 20. The pre-charge system according to Clause 16, wherein the one or more notches are located at different positions along the length of the plunger, wherein the different positions along the length of the plunger are configured to correspond to different volumes of fluid inside the barrel of the vacuum injector.

[0089] Other considerations:

[0090] In some embodiments, any item in this document may be subordinate to any item in an independent item or a dependent item. In one aspect, any item (e.g., a dependent or independent item) may be combined with any other one or more items (e.g., dependent or independent items). In one aspect, a claim may include some or all of the text (e.g., steps, operations, means, or components) recited in an item, sentence, phrase, or paragraph. In one aspect, a claim may include some or all of the text recited in one or more items, sentences, phrases, or paragraphs. In one aspect, some of the text in each of an item, sentence, phrase, or paragraph may be removed. In one aspect, additional text or elements may be added to an item, sentence, phrase, or paragraph. In one aspect, the subject matter may be implemented without utilizing some of the components, elements, functions, or operations described herein. In one aspect, the subject matter may be implemented using additional components, elements, functions, or operations.

[0091] This disclosure is provided to enable those skilled in the art to practice the various aspects described herein. This disclosure provides various examples of the subject matter, and the subject matter is not limited to these examples. Various modifications to these aspects will be readily understood by those skilled in the art, and the general principles defined herein can be applied to other aspects.

[0092] Unless otherwise specified, references to singular elements are not intended to mean "one and only one," but rather "one or more." Unless otherwise specified, the term "some" refers to one or more. Masculine pronouns (e.g., his) include feminine and neuter pronouns (e.g., her and its), and vice versa. Titles and subtitles (if any) are used for convenience only and do not limit the invention.

[0093] The term “exemplary” is used herein to mean “serving as an example or illustration.” Any aspect or design described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects or designs. In one respect, the various alternative configurations and operations described herein may be considered at least equivalent.

[0094] For example, the phrase "aspect" does not imply that such an aspect is essential to the present subject matter or that such an aspect is applicable to all configurations of the present subject matter. Disclosure relating to an aspect may apply to all configurations or one or more configurations. An aspect may provide one or more examples. For example, the phrase "aspect" may refer to one or more aspects, and vice versa. For example, the phrase "embodiment" does not imply that such an embodiment is essential to the present subject matter or that such an embodiment is applicable to all configurations of the present subject matter. Disclosure relating to an embodiment may apply to all embodiments or one or more embodiments. An embodiment may provide one or more examples. For example, the phrase "embodiment" may refer to one or more embodiments, and vice versa. For example, the phrase "configuration" does not imply that such a configuration is essential to the present subject matter or that such a configuration is applicable to all configurations of the present subject matter. Disclosure relating to a configuration may apply to all configurations or one or more configurations. A configuration may provide one or more examples. For example, the phrase "configuration" may refer to one or more configurations, and vice versa.

[0095] In one respect, unless otherwise stated, all measurements, values, ratings, locations, sizes, dimensions, and other specifications set forth in this specification (including in the appended claims) are approximate, not precise. In another respect, they are intended to have a reasonable range consistent with the functions they pertain to and with the custom of the art to which they belong.

[0096] In one respect, the term "linkage" can refer to a direct connection. In another respect, the term "linkage" can refer to an indirect connection.

[0097] For example, the terms “top,” “bottom,” “front,” and “rear” used in this disclosure should be understood to refer to any frame of reference, rather than a general gravitational frame of reference. Therefore, the top surface, bottom surface, front surface, and rear surface can extend upward, downward, diagonally, or horizontally in a gravitational frame of reference.

[0098] Various items may be arranged differently (e.g., in different orders or divided in different ways), all without departing from the scope of the subject matter. All structural and functional equivalents of the elements throughout the various aspects described in this disclosure (that are known to or will be known hereafter by one of ordinary skill in the art) are expressly incorporated herein by reference and are intended to be covered by the claims. Furthermore, nothing disclosed herein is intended to be offered to the public, whether or not such disclosure is expressly recited in the claims. Without a description of a structure, material, or action supporting it, no claim element should be construed as a means or step for performing a particular function, unless the element is expressly stated using the phrase “means for…” or, in the case of a method claim, the element is stated using the phrase “step for…”. Moreover, with regard to the use of terms such as “comprising,” “having,” etc., such terms are intended to be inclusive in a manner similar to the term “including,” as interpreted when “comprising” is used as a transitional word in a claim.

[0099] The title, background art, summary of the invention, description of the drawings, and abstract of this disclosure are hereby incorporated into this disclosure and are provided as illustrative examples rather than as limiting descriptions. This application is filed on the understanding that they are not intended to limit the scope or meaning of the claims. Furthermore, in the detailed description, it will be apparent that the description provides illustrative examples, and various features are combined in various embodiments to simplify the disclosure. The methods disclosed should not be construed as reflecting an intention that the claimed subject matter requires more features than expressly recited in each claim. Rather, as reflected in the appended claims, the inventive subject matter lies in all features of fewer than those in a single disclosure configuration or operation. The appended claims are thus incorporated into the detailed description, each claim being an independent, separately claimed subject matter.

[0100] The claims are not intended to be limited to the aspects described herein, but rather to conform to the full scope consistent with the language claims and to cover all legal equivalents. Nevertheless, all claims are intended to include subject matter that does not satisfy patent requirements, and they should not be interpreted in this manner.

Claims

1. A pre-charging accessory for a vacuum syringe, the pre-charging accessory comprising: (a) A proximal cap comprising one or more engagement features configured to engage with the plunger flange of the vacuum injector; and (b) a stop that extends distally from at least one of the one or more engagement features, wherein each stop comprises: An alignment section, which protrudes from a corresponding engagement feature and extends radially inward, is configured to align the stop with a recess in the plunger of the vacuum injector. An arm extending distally from the alignment section, the arm being configured to extend along the recess and fitting into the barrel of the vacuum injector, and radially supported against the barrel; and A lip that protrudes from the distal portion of the arm is configured to restrict the plunger from re-entering the cylinder after the plunger and the stop have been withdrawn from the cylinder.

2. The pre-charging accessory of claim 1, wherein, The proximal cap is flat and round.

3. The pre-charging accessory of claim 1, wherein, The one or more engagement features are positioned on the outer periphery of the proximal cap.

4. The pre-charging accessory of claim 1, wherein, The one or more engagement features are configured to snap onto the plunger flange.

5. The pre-charge accessory according to claim 1, wherein, Each of the one or more joining features is at least about 90° away from the adjacent joining feature.

6. The pre-charge accessory according to claim 1, wherein, The angle between the alignment section and the arm is between approximately 150° and 160°.

7. The pre-charge accessory according to claim 1, wherein, Each stop arm further includes at least one sub-arm. Each sub-arm extends distally from the arm and radially away from the arm, and has a corresponding lip protruding from the distal portion of the respective sub-arm. Each sub-arm is configured to be compressed onto the arm for assembly within the barrel of the vacuum injector. Each sub-arm is configured to support the cylinder radially outward, and Each corresponding lip is configured to restrict the plunger from re-entering the cylinder.

8. The pre-charged accessory according to claim 7, wherein, Each sub-arm is positioned at a different location along the corresponding arm to accommodate different volumes of fluid inside the cylinder.

9. The pre-charge accessory according to claim 7, wherein, Each subarm extends distally from the arm at an angle between approximately 155° and 165° and extends radially away from the arm.

10. The pre-charge accessory according to claim 1, wherein, The lip includes a sloping edge and a flat end, the flat end being configured to abut a proximal end of the cylinder when the sloping edge is withdrawn from the cylinder, so as to restrict the plunger from re-entering the cylinder after the plunger and the stop have been withdrawn from the cylinder.

11. The pre-charge accessory according to claim 10, wherein, The flat end is perpendicular to the arm.

12. A pre-charge accessory for a vacuum injector, the pre-charge accessory comprising: A proximal cap, comprising one or more engagement features configured to engage with the plunger flange of the vacuum injector; and One or more stops, each comprising one or more arms, each of which is configured to extend along a recess in the plunger of the vacuum injector and to radially outwardly support the cylinder of the vacuum injector while the plunger and the one or more stops are located inside the cylinder. The distal portion of each arm includes a lip configured to restrict the plunger from re-entering the cylinder after the plunger and the stop have been withdrawn from the cylinder.

13. The pre-charge accessory according to claim 12, wherein, Each of the one or more stops comprises three arms.

14. The pre-charge accessory according to claim 12, wherein, Each of the one or more stops extends distally from one of the engagement features.

15. The pre-charge accessory according to claim 12, wherein, The lip includes a sloping edge and a flat end, the flat end being configured to abut a proximal end of the cylinder when the sloping edge is withdrawn from the cylinder, so as to restrict the plunger from re-entering the cylinder after the plunger and the stop have been withdrawn from the cylinder.

16. A pre-charge system for a vacuum injector, the pre-charge system comprising: A pre-charge accessory, configured to be coupled to the barrel flange of the vacuum injector and including one or more keys; and A plunger, including one or more notches, is configured to rotate relative to the precharge attachment between a free position and a locked position. In the free position, the plunger is configured to reciprocate within the cylinder, and in the locked position, the plunger is unable to reciprocate within the cylinder. In the free position, the one or more notches are not aligned with any of the one or more keys. In the locked position, at least one of the one or more notches is aligned with at least one of the one or more keys.

17. The pre-charge system according to claim 16, wherein, The precharge attachment is configured to at least partially cover the barrel flange and surround the proximal barrel opening of the vacuum injector, and the one or more keys protrude from the precharge attachment and are configured to extend partially over the proximal opening.

18. The pre-charge system according to claim 16, wherein, The pre-charge accessory includes one or more engagement features configured to snap onto the cylinder flange.

19. The pre-charge system according to claim 16, wherein, Each of the one or more keys protrudes radially inward, being at least as deep as each of the one or more notches, and wider than each of the one or more notches.

20. The pre-charge system according to claim 16, wherein, The one or more notches are located at different positions along the length of the plunger, wherein the different positions along the length of the plunger are configured to correspond to different volumes of fluid inside the barrel of the vacuum injector.

Images