Intravenous line flush device

Abstract

The present invention relates to a flushing device that can be used to efficiently flush an IV line and can be coupled to an IV set between an IV tubing or drip chamber and a fluid source. Medication flows from the fluid source, through a flow chamber of the flushing device, and into the remainder of the IV line. The flushing device can also include or be coupled to a saline source that fills a saline chamber of the flushing device with saline. The saline chamber is connected to the flow chamber such that saline only enters the flow chamber after the medication enters the IV line and thus the IV line.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to U.S. Application No. 19 / 197,788, filed May 2, 2025, entitled “INTRAVENOUS LINE FLUSHING DEVICE”. The entire contents of U.S. Application No. 19 / 197,788 are incorporated herein by reference. Technical Field

[0003] The present invention generally relates to apparatus and methods for flushing intravenous (IV) lines, and in particular to a flushing device that can be coupled to an IV kit to selectively guide one or more fluids through it. Background Technology

[0004] Medical treatments typically involve infusing a patient with medical fluids (such as saline solution or liquid medications) using an IV catheter. This intravenous catheter is connected to a source of the fluid, such as an IV bag, via an arrangement of flexible tubing and fittings commonly referred to as an “IV kit.”

[0005] During IV fluid delivery, approximately 10% to 32% of the medical fluid may remain within the IV kit due to dead space within the IV device. Consequently, the medical fluid cannot reach the patient, increasing the risk of treatment failure due to underdosing, increasing average hospital stays (which places a burden on caregivers), accelerating antimicrobial resistance, and resulting in medication waste. For example, in some cases, at least 20% of the medical fluid may remain within the IV kit and be discarded as clinical waste. Summary of the Invention

[0006] In conventional IV fluid delivery, caregivers manually flush the IV line to remove medical fluid retained in the IV kit. However, this is very time-consuming for caregivers who are often overburdened. Therefore, an IV line flushing device that limits the amount of medical fluid retained in the IV kit is ideal for mitigating health risks to patients receiving injectable treatments, reducing the workload of caregivers managing patients' injectable treatments, and limiting wasted medical fluid. Based on this understanding, some embodiments of this disclosure relate to a flushing device that automatically flushes the IV line after the full dose of medical fluid has been introduced into the IV line for delivery to the patient. Other embodiments of this disclosure relate to a flushing device that, in addition to flushing the IV line after fluid delivery, can also be used to pre-fill the IV line before fluid delivery. Furthermore, this disclosure also relates to a flushing device that limits the mixing of medical fluid (i.e., pharmaceuticals) with flushing fluid (i.e., saline), which reduces dilution and facilitates efficient IV fluid delivery.

[0007] Therefore, some embodiments of this disclosure relate to a flushing device for an intravenous (IV) line, the flushing device including an inlet port configured to fluidly connect the flushing device to a fluid source, an outlet port configured to fluidly connect the flushing device to the IV line, a flow chamber fluidly connected to the inlet and outlet ports, a saline chamber separated from the flow chamber by a wall and configured to be filled with saline solution, one or more openings located in the wall, and one or more baffles covering each of the one or more openings from inside the flow chamber and movably coupled to the wall, wherein when the pressure in the flow chamber is greater than the pressure in the saline chamber, the one or more baffles close each of the one or more openings, and wherein when the pressure in the flow chamber is less than the pressure in the saline chamber, the one or more baffles expose each of the one or more openings such that each of the one or more openings fluidly connects the flow chamber and the saline chamber.

[0008] In some embodiments, the outlet port is configured to be connected to the drip chamber of the IV line.

[0009] In some embodiments, each of one or more openings is configured to facilitate the flow of saline from the saline chamber to the flow chamber when the pressure in the flow chamber is less than the pressure in the saline chamber.

[0010] In some embodiments, when the flow chamber is empty and the saline chamber contains at least a portion of saline, the pressure in the flow chamber is less than the pressure in the saline chamber.

[0011] In some embodiments, a saline chamber is formed between a wall and the outer wall of the flushing device. Optionally, the flushing device further includes a stop that presses one or more baffles against the wall inside the flow chamber, wherein the stop is slidably coupled to the wall such that the stop is configured to slide away from one or more baffles and toward the inlet port when the IV line is connected to the outlet port. Optionally, the outer wall comprises an elastic material such that when the pressure in the flow chamber is less than the pressure in the saline chamber, the outer wall is configured to arch inward toward the flow chamber.

[0012] In some embodiments, the flow chamber is adjacent to the saline chamber. Optionally, the flushing device further includes a saline inlet in the saline chamber and a saline source filled with saline, wherein the saline inlet is configured to fluidly connect the saline source to the saline chamber. Optionally, the saline source includes a collapsible bag configured to collapse as saline flows from the saline source to the saline chamber when the pressure in the flow chamber is less than the pressure in the saline chamber. Optionally, the flushing device further includes a clamp coupled to the saline inlet, wherein the clamp is configured to fluidly disconnect the saline source and the saline chamber when the IV line is pre-filled.

[0013] Some embodiments of this disclosure relate to a flushing device for an intravenous (IV) line, the flushing device comprising: a Y-connector including a first inlet leading to a flow lumen and configured to be connected to a fluid source and a second inlet leading to a saline lumen intersecting the flow lumen; and a Tesla valve including a downstream end connected to the second inlet and an upstream end configured to be connected to the saline source, wherein the flow lumen is configured to deliver fluid from the fluid source to the IV line, and wherein the Tesla valve is configured to block the flow of fluid toward the saline source and restrict the mixing of fluid with the saline.

[0014] In some embodiments, the flushing device further includes a saline source, wherein the saline source is configured to be located at a first height, the fluid source is configured to be located at a second height, and the first height is at or below the second height, such that the saline flows through the Tesla valve when the fluid level is at or below the first height.

[0015] In some embodiments, the saline lumen is configured to transport saline from the saline source to the IV line after the fluid source has been emptied.

[0016] In some embodiments, the flow lumen has a first diameter, the flow path in the Tesla valve has a second diameter, and the first diameter is larger than the second diameter, such that the Tesla valve is configured to slow the flow of saline toward the IV line.

[0017] Other embodiments of this disclosure relate to a flushing device for an IV line, the flushing device including an inlet port configured to fluidly connect the flushing device to a fluid source, an outlet port configured to fluidly connect the flushing device to the IV line, a flow channel fluidly connected to the inlet port and the outlet port, a saline channel fluidly connected to the flow channel at an intersection, a saline chamber fluidly connected to the saline channel, and a knob connected to the flow channel and the saline channel at an intersection and including a no-flow setting, a flow setting, and a saline setting, wherein when the knob is switched to the no-flow setting... When the knob is switched to the flow setting, it blocks the flow channel to prevent fluid from the fluid source from flowing through the flow channel and blocks the saline channel to prevent saline from flowing into the flow channel from the saline chamber. When the knob is switched to the flow setting, it allows fluid from the fluid source to flow through the flow channel and to the outlet port, and blocks the saline channel to prevent saline from flowing into the flow channel. When the knob is switched to the saline setting, it blocks the flow channel to prevent fluid from the fluid source from flowing through the flow channel and to the outlet port, and allows saline to flow into the flow channel and to the outlet port from the saline channel.

[0018] In some embodiments, the knob includes a connection channel. Optionally, when the knob is switched to the no-flow setting, the connection channel is misaligned with the flow channel and the saline channel. Optionally, when the knob is switched to the flow setting, the connection channel fluidly connects the flow channel and the outlet port. Optionally, when the knob is switched to the saline setting, the connection channel fluidly connects the saline channel and the outlet port.

[0019] Further features and advantages of this subject matter will be set forth in the description which follows, and some features and advantages will become 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, as well as the structures specifically pointed out in the accompanying drawings.

[0020] It should be understood that the general description above and the detailed description below are exemplary and illustrative, and are intended to provide further explanation of the technical subject matter. Attached Figure Description

[0021] 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, not limit, the invention. The drawings include the following figures:

[0022] Figure 1 An IV fluid delivery kit connected to a patient is shown according to various aspects of this disclosure.

[0023] Figure 2A-2H Embodiments of a rinsing apparatus according to various aspects of this disclosure are shown.

[0024] Figures 3A-3E Another embodiment of a rinsing apparatus according to various aspects of this disclosure is shown.

[0025] Figures 4A-4E Another embodiment of a rinsing apparatus according to various aspects of this disclosure is shown.

[0026] Figures 5A-5C Another embodiment of a rinsing apparatus according to various aspects of this disclosure is shown. Detailed Implementation

[0027] In the following detailed description, numerous specific details are set forth 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 to avoid obscuring the subject matter.

[0028] 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 contemplated that although specific embodiments of this disclosure may be disclosed or illustrated in the context of intravenous (IV) fluid delivery kits, these embodiments may be used in other fluid delivery systems. Moreover, various applications and modifications of such embodiments that may occur to those skilled in the art are also included within the general concepts described herein.

[0029] Flushing the IV line is a critical step performed after medication has been delivered to the patient via intravenous infusion. For example, after a medication (hereinafter referred to as medical fluid or fluid) is in the IV line, caregivers often flush the IV line with saline. However, manual flushing is time-consuming and can result in the medical fluid being diluted by the saline. Therefore, a device that keeps the medical fluid and saline separate can be valuable. This can be achieved with a device having separate chambers, channels, lumens, etc., for the medical fluid and saline, wherein saline flows into the IV line provided that all medical fluid has been delivered into the IV line.

[0030] Now refer to the attached diagram, Figure 1 An IV fluid delivery kit connected to a patient according to various aspects of this disclosure is shown. The IV kit 10 includes a medical fluid bag 12, an IV line flushing device 100, an infusion chamber 14, a first tube 16, a fluid connector assembly 18, a second tube 20, and a catheter 22. Tube 16 extends between the infusion chamber 14 and the fluid connector assembly 18. Tube 20 extends between the fluid connector assembly 18 and the catheter 22, which is inserted into the patient's arm 50.

[0031] The flushing device 100 is designed for use in medical applications, such as IV kit 10 and other IV medical fluid delivery applications using infusion pumps, as non-limiting examples. After the medical fluid bag 12 is emptied (i.e., after the patient has received the full dose of medication from the medical fluid bag 12), the flushing device 100 automatically flushes the IV tubing (which includes fitting 16, connector 18, fitting 20, and catheter 22) with saline.

[0032] This disclosure illustrates and describes several embodiments of a flushing device. For example, the flushing device may include a flow chamber. The flow chamber has an inlet port for connecting the flushing device to a fluid source (e.g., fluid source). Figure 1 The infusion pump, IV bag, or medical fluid bag 12 in the flow chamber. The flow chamber also has an outlet port for connecting a flushing device to the drip chamber or IV line (e.g., Figure 1(Infusion chamber 14 or fitting 16). The flow chamber of the flushing device receives medical fluid from a fluid source via an inlet port, and the medical fluid flows through the flow chamber and out of the outlet to the patient.

[0033] The flushing device may also include a saline chamber filled with physiological saline. The saline chamber is separated from the flow chamber by a wall. The wall has at least one opening, and each opening is covered by a baffle. Each baffle is movably coupled to the wall from the interior of the flow chamber, such that each baffle covers its corresponding opening to close it, and can be removed from its corresponding opening to expose it, allowing physiological saline to flow out of the saline chamber and into the flow chamber via the opening. Whether the baffle covers or moves away from its corresponding opening depends on the relative pressure in the flow chamber and the saline chamber. When the pressure in the flow chamber is greater than the pressure in the saline chamber, each baffle presses against the wall to cover and close the opening. On the other hand, when the pressure in the flow chamber is less than the pressure in the saline chamber, the movement of each baffle is unrestricted. Furthermore, because the pressure in the flow chamber is less than the pressure in the saline chamber, the physiological saline will flow towards the flow chamber. As a result, the physiological saline will push each baffle away from its corresponding opening and into the flow chamber.

[0034] When the amount of medical fluid in the flow chamber is less than the amount of saline in the saline chamber, the pressure in the flow chamber is lower than the pressure in the saline chamber, which typically occurs after the fluid source has been emptied. Therefore, the flushing device automatically flushes the IV line because when the fluid source is emptied (i.e., after IV fluid delivery is complete), the pressure in the flow chamber is lower than the pressure in the saline chamber, causing the saline to flow towards the flow chamber. After the saline enters the flow chamber, it flows out of the outlet port and towards the rest of the IV line to flush it. Figures 2A-3E Two examples of embodiments of the rinsing device are depicted.

[0035] Figure 2A-2H A first example of a flushing apparatus according to various aspects of this disclosure is shown. Figure 2A As shown, the flushing device 200 can be coupled to the IV line between the medical fluid bag 12 and the infusion chamber 14. The flushing device 200 has an inlet port 202 that fluidly connects the flushing device 200 to the medical fluid bag 12. In some embodiments, the inlet port 202 is a puncture device configured to puncture the medical fluid bag 12. Fluid 210 from the medical fluid bag 12 can flow through the inlet port 202 into the flushing device 200 and exit from an outlet 204 on the other side of the flushing device 200. In the illustrated embodiment, the outlet 204 is configured to connect the flushing device 200 to the infusion chamber 14. In some embodiments, the outlet 204 can be directly coupled to the IV tubing 16.

[0036] Figure 2B A flushing device 200 connected to the infusion chamber 14 is depicted. The flushing device 200 has a flow chamber 206 and a saline chamber 212. As shown, the flow chamber 206 is located within the saline chamber 212. In some embodiments, the flow chamber 206 and the saline chamber 212 are concentric cylinders. In other embodiments, the flow chamber 206 and the saline chamber 212 are nested rectangular containers. Optionally, the flow chamber 206 and the saline chamber 212 have different shapes (e.g., the flow chamber 206 is cylindrical, while the saline chamber 212 is rectangular).

[0037] The saline chamber 212 is fluidly separated from the flow chamber 206 by a wall 218. As described above regarding the wall, opening, and baffle, the wall 218 includes an opening 220 covered by a baffle 208 movably abutting against the wall 218 to allow or prevent fluid movement between the saline chamber 212 and the flow chamber 206. In some embodiments of this disclosure, the baffle 208 may be coupled to the wall 218 and may be movable toward or away from the inner surface of the flow chamber 206 to allow or prevent fluid movement between the saline chamber 212 and the flow chamber 206. In some embodiments, the baffle 208 abuts against the wall 218 to block the opening 220, thereby preventing fluid movement between the saline chamber 212 and the flow chamber 206.

[0038] Figure 2A-2H The flushing device 200 shown also includes a stop 250 located within the flow chamber 206 and configured to slide relative to the baffle 208 within the flow chamber 206. Before the flushing device 200 is coupled to the drip chamber 14, the stop 250 is in a first position, as shown... Figure 2B As shown, the stop 250 is axially aligned with the baffle 208. In the first position, the stop 250 presses the baffle 208 against the wall 218, thereby preventing any movement of the baffle 208 away from the opening 220 and keeping the opening 220 closed. However, when the flushing device 200 is coupled to the infusion chamber 14, the puncture member 15 of the infusion chamber 14 causes the stop 250 to slide to a second position, as shown. Figure 2C As shown. In the second position, the stop 250 is axially offset from the baffle 208, allowing the baffle 208 to move away from the opening 220, thereby fluidly connecting the saline chamber 212 and the flow chamber 206.

[0039] In some embodiments, the flushing device 200 further includes a sleeve 215 within the flow chamber 206, and a stop 250 is slidably coupled to the sleeve 215 instead of to the wall 218. In those embodiments, a baffle 208 may be movably coupled to the sleeve 215, and an opening 220 extends through both the wall 218 and the sleeve 215.

[0040] Figure 2CA baffle 208 covering opening 220 is shown, and Figure 2D A perspective view of a cross-section of the flushing device 200 is shown, depicting one of the openings 220 in the wall 218. Figure 2E The image shows that the baffle 208 is in a free-moving state, at which point the opening 220 is exposed.

[0041] Figure 2F-2H The flushing device 200 is shown at different stages of use. Figure 2F In this process, fluid 210 (from a fluid source) flows into inlet port 202 and fills flow chamber 206. Fluid 210 flows through the puncture member 15 of infusion chamber 14 and into the rest of the IV line. Specifically, fluid 210 in flow chamber 206 enters the opening 17 of puncture member 15 and flows through the lumen 19 of puncture member 15 to enter infusion chamber 14. At this stage, because flow chamber 206 is filled with medical fluid 210 (and the fluid source may contain more medical fluid 210 than the saline chamber 212 contains saline 214), the pressure in flow chamber 206 is greater than the pressure in saline chamber 212. The pressure from fluid 210 pushes baffle 208 against wall 218 and closes opening 220. Therefore, saline 214 does not enter flow chamber 206.

[0042] exist Figure 2G In this phase, flow chamber 206 contains no fluid 210, which occurs when the fluid source is emptied (and fluid delivery is complete). At this stage, the pressure in flow chamber 206 is lower than the pressure in saline chamber 212, causing saline 212 to move toward the opening 220 in wall 218. Saline 212 pushes aside baffle 208 and enters flow chamber 206. Saline 212 then flows through puncture fitting 15 and into infusion chamber 14, as... Figure 2H As shown.

[0043] Figure 2G and Figure 2H The elastic properties of the outer wall 252 of the flushing device 200 and the saline chamber 212 are shown. Figure 2G In the process, when the saline solution 212 just begins to enter the flow chamber 206, the outer wall 252 begins to arch inward (towards the flow chamber 206). As more saline solution 212 flows into the flow chamber 206 and out of the flushing device 200, the degree of inward arching of the outer wall 252 intensifies, such as... Figure 2H As shown.

[0044] Figures 3A-3E A second example of a flushing apparatus according to various aspects of this disclosure is shown. Figure 3AAs shown, the flushing device 300 can be coupled to an IV kit between the medical fluid bag 12 and the infusion chamber 14. The flushing device 300 has an inlet port 302 that fluidly connects the flushing device 300 to the medical fluid bag 12. In some embodiments, the inlet port 302 is a puncture device (e.g., puncture point) configured to puncture the medical fluid bag 12. Figure 3B (As shown). Fluid 310 from the medical fluid bag 12 can flow through the inlet port 302 into the flushing device 300 and exit from the outlet port 304 on the other side of the flushing device 300. In the illustrated embodiment, the outlet port 304 is configured to receive a puncture device from the infusion chamber 14. In other embodiments, the outlet port 304 may include a puncture device (e.g., for directly connecting the flushing device 300 to the IV line 16). In embodiments where the outlet port 304 is a puncture device, the flushing device 300 may also include a cap covering the puncture device, wherein the cap is configured to be removed when the flushing device 300 is connected to the IV line.

[0045] Figure 3B A flushing device 300 is shown attached before being connected to the IV kit. Figure 3B In this embodiment, two walls of the rinsing device 300 are transparent, making the internal features of the rinsing device 300 visible. The rinsing device 300 has a flow chamber 306 and a saline chamber 312. As shown, the flow chamber 306 is adjacent to the saline chamber 312. In the embodiment shown in this disclosure, the flow chamber 306 and the saline chamber 312 are rectangular. However, other shapes are also possible. In some embodiments, the flow chamber 306 and the saline chamber 312 have different shapes.

[0046] The saline chamber 312 is separated from the flow chamber 306 by a wall 318. According to the above description of the wall, opening, and baffle, the wall 318 includes an opening 320 covered by a baffle 308 (e.g., Figure 3D and Figure 3E (As shown). In the embodiment shown here, baffle 308 forms the lower half of wall 318, and opening 320 extends across the entire width of flushing device 300. In some embodiments, baffle 308 is a cut-out portion of wall 318, and opening 320 occupies only a portion of the lower portion of wall 318. In other embodiments, baffle 308 forms the lower half of wall 318, and opening 320 occupies only a portion of the lower portion of wall 318. Optionally, baffle 308 forms the entire wall 318.

[0047] The saline chamber 312 includes a saline inlet 354 configured to fluidly connect the saline chamber 312 to a saline source, such as... Figure 3A and Figure 3C-3E The physiological saline source 356 is shown in the figure. Figure 3A and Figure 3C-3E A clamp 358 connected to a saline inlet 354 is also depicted. The clamp 358 has a slot with a notch at one end, wherein the slot and notch are sized to fit around the saline inlet 354. A caregiver can slide the clamp 358 relative to the saline inlet 354 to control the flow of saline 314 from the saline source 356 to the saline chamber 312. The slot is narrower than the notch, so when the saline inlet 354 is within the slot, the saline inlet 354 does not connect the saline source 356 to the saline chamber 312. On the other hand, when the saline inlet 354 is within the notch, the saline inlet 354 is open, so the saline 314 can exit the saline source 356 and fill the saline chamber 312. In use, nurses can use clamp 358 to open saline inlet 354 after the IV line has been prefilled and fluid 310 has begun to be delivered from medical fluid bag 12 (but before medical fluid bag 12 is emptied).

[0048] Figure 3C The flushing device 300 is shown in cross-section as fluid 310 is delivered from the medical fluid bag 12 to the IV line and the patient. Fluid 310 flows from the medical fluid bag 12 through inlet 302 and into flow chamber 306. Fluid 310 then flows out of outlet 304 and into the IV line (i.e., infusion chamber, IV fitting, or another fluid connector).

[0049] The baffle 308 of the flushing device can be configured as a one-way valve to allow fluid to move from the saline inlet 354 toward the flow chamber 306 and to prevent fluid from moving from the flow chamber 306 toward the saline inlet 354. In some embodiments, such as Figure 3B-3E As shown, the bottom plate of the saline chamber 312 is slightly higher than the bottom plate of the flow chamber 306, and when the baffle 308 is in the closed position (e.g. Figure 3B and Figure 3C As shown), the bottom of baffle 308 rests against a stepped portion formed by two base plates. Therefore, baffle 308 is a one-way baffle, which can only be rotated into flow chamber 306. Figure 3C During the fluid delivery phase shown, fluid 310 presses against baffle 308 and keeps opening 320 closed, which restricts the flow of saline into the flow chamber.

[0050] When fluid source 12 is emptied, such as Figure 3DAs shown, fluid 310 does not apply pressure to baffle 308. As a result, saline 314 in saline chamber 312 pushes against baffle 308 and exposes opening 320. Saline 314 can then flow from saline chamber 312 to flow chamber 306. In other words, when the pressure in flow chamber 306 is less than the pressure in saline chamber 312, saline 314 can open baffle 308 to expose opening 320. After saline 314 enters saline chamber 312, saline 314 flows out of outlet 304 and into IV line to flush IV line.

[0051] In some embodiments, the saline source 356 includes a collapseable bag (e.g., a plastic bag) that collapses as saline 314 is discharged from the saline source 356. The collapseable bag helps to lock the saline 314 in the IV line and limits the possibility of backflow in the IV line.

[0052] In conventional methods and devices used to flush IV lines after fluid delivery, some medical fluid is wasted because when the medical fluid is at the same level as the saline solution (i.e., the level of medical fluid in the IV kit is the same as the level of saline solution), the saline solution begins to flow into the main delivery line and dilutes the medical fluid. This wastes medical fluid and prolongs the time required to infuse the medical fluid. On the other hand, with the device described herein, saline solution does not enter the IV line before all medical fluid has entered the IV line.

[0053] Figure 1 The flushing device 100 shown does not require a one-way baffle to control the flow of saline solution. Other features of the flushing device 100 are as follows: Figures 4A-5B It is shown in the figure and described in more detail below. Figures 4A-4E A third example of a flushing apparatus according to various aspects of this disclosure is shown. Figure 4A The illustration shows an irrigation device 400 that can be coupled to an IV kit between a medical fluid bag 12 and an infusion chamber 14. The irrigation device 400 includes a Y-connector 460 and a Tesla valve 466 coupled to the Y-connector 460 (described below). Figure 4E (Discussed in more detail), and optionally, a saline source 456 connected to the Tesla valve 466.

[0054] like Figure 4BAs shown, the Y-connector 460 includes two inlets leading to two lumens, which converge and lead to an outlet. Specifically, the Y-connector 460 has a first inlet 402 leading to a flow lumen 406 (also referred to as a flow channel 406) and an outlet 404 located on the opposite side (downstream) of the flow lumen 406. The Y-connector 460 also has a second inlet 462 leading to a saline lumen 412 (or saline channel 412), which converges with the flow lumen 406 at an upstream point of the outlet 404. The first inlet 402 is configured to connect to a fluid source, such as a medical fluid bag 12, and fluid 410 can flow from the medical fluid bag 12 into the first inlet 402, through the flow lumen 406, and out of the outlet 404, reaching the IV line and the patient. The saline lumen 412 is configured to deliver saline 414 from the saline source 456 and the Tesla valve 466 to the downstream end of the flow lumen 406 and into the IV line to flush the IV line after fluid delivery.

[0055] Before the fluid delivery is complete, saline 414 remains in saline source 456. This is because the flushing device 400 is configured such that when saline source 456 is connected to flushing device 400, saline source 456 is at the same height 464 as the bottom of medical fluid bag 12. (Optionally, saline source 456 is lower than the bottom of medical fluid bag 12.) Due to the pressure difference caused by the relative height and size of saline source 456 and medical fluid bag 12 (i.e., medical fluid bag 12 is higher than saline source 456, and in most cases, larger than saline source 456), saline 414 will not be able to flow out of saline source 456 until the fluid level of fluid 410 is below line 464. Therefore, saline 414 will not be able to flow out of saline source 456 until medical fluid bag 12 is emptied.

[0056] exist Figure 4C In this stage, the medical fluid bag 12 is empty, and the fluid level 410 is at line 464. At this stage, saline 414 begins to flow out of the saline source 456, into the Tesla valve 466, and into the saline lumen 412. Due to the aforementioned pressure difference, the saline 414 automatically begins to flow at this point.

[0057] As will be discussed in more detail below, the fluid path through Tesla valve 466 is smaller than the flow lumen 406, so that saline 414 does not reach saline lumen 412 before all fluid 410 flows out of saline lumen 412. This prevents mixing of saline 414 and fluid 410, and thus prevents dilution of fluid 410.

[0058] exist Figure 4DIn this process, all fluid 410 has left the flushing device 400, leaving only saline 414. The saline 414 will flow out of the saline source 456 and the flushing device 400 until all the saline 414 is in the IV line, thus flushing the IV line with saline 414 after the delivery of fluid 410.

[0059] It is worth noting that, since the medical fluid bag 12 is typically larger than the saline source 456, fluid 410 may flow upwards into the saline lumen 412 and mix with the saline 414 in the saline source 456. For this reason, the flushing device 400 also includes a Tesla valve 466 located between the saline lumen 412 and the saline source 456. The Tesla valve 466 has a downstream end 468 connected to a second inlet 462 and an upstream end 470 connected to the saline source 456. The Tesla valve 466 restricts the flow of fluid 410 into the saline source 456 and transports saline 414 from the saline source 456 to the saline lumen 412 (after fluid delivery is complete).

[0060] Figure 4E This is a diagram depicting the fluid path 480 inside a Tesla valve (such as Tesla valve 466, which is part of flushing device 400) and the fluid flow patterns 484, 486, and 488 through the Tesla valve. Figure 4E As shown, fluid path 480 is a repeating pattern of alternating recesses 482. The left-hand fluid path 480A depicts fluid flowing upstream through the Tesla valve (i.e., in...). Figure 4B-4D In this configuration, fluid flows from the downstream end 468 of the adjacent saline lumen 412 towards the upstream end 470 connected to the saline source 456. Before the first recess, the fluid splits into two streams: a main stream 484 and a secondary stream 486 passing through the recess 482. The fluid in the secondary stream 486 loses momentum at the bend around the recess 482. Subsequently, the fluid in the secondary stream 486 converges with the fluid in the main stream 484, thus blocking the upstream flow of fluid. Therefore, the Tesla valve restricts the upstream flow of fluid. Figure 4B-4D In the application scenario of the flushing device 400, the Tesla valve 466 restricts the flow of fluid 410 toward the saline source 456, which limits the mixing of fluid 410 with saline 414. On the other hand, as shown in the fluid path 480B on the right, fluid can easily flow downstream through the Tesla valve (i.e., in...). Figure 4B-4D The fluid flows from the saline source 456 toward the saline lumen 412. Most of the fluid remains in the main flow 488, which means that the Tesla valve experiences very little resistance in the downstream direction. Therefore, with respect to the flushing device 400, the Tesla valve 466 facilitates the downstream flow of saline 414 toward the saline lumen 412.

[0061] Another reason why the Tesla valve 466 restricts the flow of fluid 410 into the saline source 456 is the relative diameter of the fluid path in the Tesla valve 466 and the flow lumen 406. Specifically, the flow lumen 406 (and the path between the Y-connector 460 and the medical fluid bag 12) has a larger diameter than the fluid path in the Tesla valve 466. As a result, the fluid 410 travels upward along the Tesla valve 466 more slowly than it travels through the flow lumen 406 toward the IV line.

[0062] Figures 5A-5C A fourth example of a flushing apparatus according to various aspects of this disclosure is shown. Figure 5A As shown, the flushing device 500 can be connected to the IV kit between the medical fluid bag 12 and the infusion chamber 14. Figure 5B As shown, the flushing device 500 has an inlet port 502 for fluidly connecting the flushing device 500 to a medical fluid bag 12. In some embodiments, the inlet port 502 is a puncture device configured to puncture the medical fluid bag 12. Fluid 510 from the medical fluid bag 12 can flow through the inlet port 502 into the flushing device 500 and exit from an outlet port 504 on the other side of the flushing device 500. In the illustrated embodiment, the outlet port 504 is configured to receive a puncture device from the infusion chamber 14. In other embodiments, the outlet port 504 may include a puncture device (e.g., for directly connecting the flushing device 500 to an IV tube).

[0063] Now for reference Figure 5C The flushing device 500 includes a flow channel 506 that is fluidly connected to an inlet port 502 and an outlet port 504, which will be discussed in more detail below, depending on the setting of a knob 572. In some embodiments, the flow channel 506 is a channel or tube extending between the inlet port 502 and the outlet port 504. The flushing device 500 also includes a saline chamber 512 filled with saline solution and fluidly connected to the flow channel 506 and the outlet port 504 via a saline channel 580. In some embodiments, the saline chamber 512 includes an opening. Figure 5B and Figure 5C The opening is located at the top of the saline chamber 512. Nursing staff can refill the saline chamber 512 with saline through the opening, allowing the flushing device 500 to be reused even after the saline chamber 512 has been emptied.

[0064] The saline channel 580 is transverse to the flow channel 506 and intersects with the flow channel 506 at an intersection point, where the knob 572 is located to control the fluid connection between the flow channel 506 and the saline channel 580. Therefore, the knob 572 also controls the fluid source (i.e., Figure 5AThe fluid connection between the medical fluid bag 12, the saline chamber 512, and the outlet port 504 (which ultimately leads to the patient) is defined. Knob 572 includes three settings: a first ("no flow") setting 574, a second ("flow") setting 576, and a third ("saline") setting 578. Therefore, caregivers can use knob 572 to switch the flushing device 500 between different workflow modes.

[0065] In some embodiments of this disclosure, knob 572 is a three-way valve. For example, knob 572 may have a connection channel that fluidly connects or blocks the flow channel 506, the saline channel 580, and the outlet port 504 based on the setting switched by knob 572.

[0066] When knob 572 is set to "No Flow" 574, knob 572 blocks or prevents fluid from flowing from flow channel 506 toward outlet port 504 and from saline channel 580 toward outlet port 504. This can be achieved by misaligning the connecting channels relative to flow channel 506 and saline channel 580. Therefore, fluid 510 from fluid source 12 and saline from saline chamber 512 are blocked from moving toward outlet port 504. The "No Flow" setting 574 can be useful before the flushing device 500 is connected to the medical fluid bag 12 and infusion chamber 14. For example, when puncturing the medical fluid bag 12 using the flushing device 500, a caregiver might want to use the "No Flow" setting 574 to prevent fluid 410 and saline from spilling from the flushing device 500 before fluid delivery begins.

[0067] When knob 572 is set to "Flow" 576, such as at the start of fluid delivery, knob 572 allows fluid to flow from flow channel 506 to outlet port 504 while preventing or blocking fluid flow from saline channel 580 to outlet port 504. This can be achieved by aligning the connecting channel relative to flow channel 506 and misaligning the connecting channel relative to saline channel 580. Therefore, fluid 510 can flow through flow channel 506, to outlet port 504, and to the patient. When the flushing device 500 is in the "Flow" setting 576, saline is maintained in saline chamber 512 to limit the mixing of fluid 510 and saline.

[0068] When knob 572 is set to "Saline" 578, such as when all fluid 510 is in the IV line (i.e., the medical fluid bag 12 is empty), knob 572 allows fluid to flow from the saline chamber 512 to the outlet port 504, and knob 572 prevents or blocks fluid from flowing from the flow channel 506 to the outlet port 504. This can be achieved by misaligning the connection channel relative to the flow channel 506 and aligning the connection channel relative to the saline channel 580, thereby fluidly connecting the saline channel 580 and the outlet port 504. Therefore, when knob 572 can be set to "Saline" 578, the saline channel 580 is opened, allowing saline to exit the saline chamber 512 and flow toward the flow channel 506 and the outlet port 504. After all medical fluid 510 has entered the IV line, caregivers can use the "Saline" setting 578 to flush the IV line with saline after fluid delivery. In traditional flushing workflows, some medical fluids are diluted with saline and require a longer infusion time. However, using the flushing device described herein, saline is introduced into the IV line only after the full dose of medical fluid is in place, limiting dilution and fluid waste. Alternatively, caregivers can pre-fill the IV line with "saline" setting 578 before administering the medical fluid.

[0069] While this disclosure describes the use of a flushing device comprising a liquid medicine and saline solution, the flushing device described herein can also be used to facilitate the continuous delivery of two liquid medicines. For example, in any of the embodiments described herein, the saline source can be replaced with a fluid source containing a different medicine. As a result, after the first fluid source containing the first medicine is emptied, the flushing device will facilitate the flow of the second medicine from the second fluid source into the IV line.

[0070] Description of this technical topic

[0071] For example, the subject matter technique is illustrated according to the various aspects described below. For convenience, various examples of the various aspects of the subject matter technique are described according to numbered articles (1, 2, 3, etc.). These are provided by way of example only 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, such as article 1, article 9, or article 16. Other articles can be presented in a similar manner.

[0072] Item 1 A flushing device for an IV line, the flushing device comprising an inlet port configured to fluidly connect the flushing device to a fluid source, an outlet port configured to fluidly connect the flushing device to the IV line, a flow chamber fluidly connected to the inlet port and the outlet port, a saline chamber separated from the flow chamber by a wall and configured to be filled with saline solution, one or more openings located in the wall, and one or more baffles covering each of the one or more openings from inside the flow chamber and movably coupled to the wall, wherein when the pressure in the flow chamber is greater than the pressure in the saline chamber, the one or more baffles close each of the one or more openings, and wherein when the pressure in the flow chamber is less than the pressure in the saline chamber, the one or more baffles expose each of the one or more openings such that each of the one or more openings fluidly connects the flow chamber and the saline chamber.

[0073] Clause 2 of the flushing apparatus according to Clause 1, wherein the outlet port is configured to be connected to the drip chamber of the IV line.

[0074] Clause 3 of the flushing apparatus according to Clause 1, wherein each of the one or more openings is configured to facilitate the flow of saline from the saline chamber to the flow chamber when the pressure in the flow chamber is less than the pressure in the saline chamber.

[0075] Clause 4 of the flushing apparatus according to Clause 1, wherein when the flow chamber is empty and the saline chamber contains at least a portion of saline, the pressure of the flow chamber is less than the pressure of the saline chamber.

[0076] Clause 5 of the flushing device according to Clause 1, wherein the saline chamber is formed between the wall and the outer wall of the flushing device.

[0077] Clause 6 of the flushing apparatus according to Clause 5 further includes a stop that presses the one or more baffles against the wall of the flow chamber, wherein the stop is slidably coupled to the wall such that when the IV line is coupled to the outlet port, the stop is configured to slide toward the inlet port and away from the one or more baffles.

[0078] Clause 7 of the flushing apparatus according to Clause 5, wherein the outer wall comprises an elastic material such that when the pressure in the flow chamber is less than the pressure in the saline chamber, the outer wall is configured to arch inward toward the flow chamber.

[0079] Clause 8 of the flushing apparatus according to Clause 1, wherein the flow chamber is adjacent to the saline chamber.

[0080] Clause 9, the flushing apparatus according to Clause 8, further includes a saline inlet in the saline chamber and a saline source filled with the saline, wherein the saline inlet is configured to fluidly connect the saline source to the saline chamber.

[0081] Clause 10, the flushing apparatus according to Clause 9, wherein the saline source includes a collapsible bag configured to collapse as the saline flows from the saline source to the saline chamber when the pressure in the flow chamber is less than the pressure in the saline chamber.

[0082] Clause 11 of the flushing apparatus according to Clause 9 further includes a clamp coupled to the saline inlet, wherein the clamp is configured to fluidly disconnect the saline source and the saline chamber when the IV line is pre-filled.

[0083] Clause 12 A flushing device for an IV line, the flushing device comprising: a Y-connector including a first inlet leading to a flow lumen and configured to be connected to a fluid source and a second inlet leading to a saline lumen intersecting the flow lumen; and a Tesla valve including a downstream end connected to the second inlet and an upstream end configured to be connected to a saline source, wherein the flow lumen is configured to deliver fluid from the fluid source to the IV line, wherein the Tesla valve is configured to block the flow of fluid toward the saline source and restrict the mixing of the fluid with the saline.

[0084] Clause 13, the flushing apparatus according to Clause 12, further includes the saline source, wherein the saline source is configured at a first height, the fluid source is configured at a second height, and the first height is at or below the second height, such that the saline flows through the Tesla valve when the fluid level is at or below the first height.

[0085] Clause 14 of the flushing apparatus according to Clause 12, wherein the saline lumen is configured to transport the saline from the saline source to the IV line after the fluid source has been emptied.

[0086] Clause 15 of the flushing apparatus according to Clause 12, wherein the flow lumen has a first diameter, the flow path in the Tesla valve has a second diameter, and the first diameter is greater than the second diameter, such that the Tesla valve is configured to slow the flow of the saline toward the IV line.

[0087] Item 16 A flushing device for an IV line, the flushing device comprising an inlet port configured to fluidly connect the flushing device to a fluid source, an outlet port configured to fluidly connect the flushing device to the IV line, a flow channel fluidly connected to the inlet port and the outlet port, a saline channel fluidly connected to the flow channel at an intersection, a saline chamber fluidly connected to the saline channel, and a knob coupled to the flow channel and the saline channel at the intersection and including a no-flow setting, a flow setting, and a saline setting, wherein when the knob is switched to the no-flow setting, the knob blocks the flow channel. To prevent fluid from the fluid source from flowing through the flow channel and to block the saline channel to prevent saline from flowing into the flow channel from the saline chamber, wherein when the knob is switched to the flow setting, the knob allows fluid from the fluid source to flow through the flow channel and toward the outlet port, and blocks the saline channel to prevent saline from flowing into the flow channel, wherein when the knob is switched to the saline setting, the knob blocks the flow channel to prevent fluid from the fluid source from flowing through the flow channel and toward the outlet port, and allows saline to flow into the flow channel and toward the outlet port from the saline channel.

[0088] Clause 17 The flushing device according to Clause 16, wherein the knob includes a connection channel.

[0089] Clause 18 of the flushing apparatus according to Clause 17, wherein when the knob is switched to the no-flow setting, the connecting channel is misaligned with the flowing channel and the saline channel.

[0090] Clause 19 of the flushing apparatus according to Clause 17, wherein when the knob is switched to the flow setting, the connection channel fluidly connects the flow channel and the outlet port.

[0091] Clause 20, the flushing device according to Clause 17, wherein when the knob is switched to the saline setting, the connection channel fluidly connects the saline channel and the outlet port.

[0092] Further consideration

[0093] In some embodiments, any of the clauses herein may depend on any of the independent clauses or any of the dependent clauses. In one aspect, any of the clauses (e.g., dependent or independent clauses) may be combined with one or more other clauses (e.g., dependent or independent clauses). In one aspect, a claim may include some or all of the words (e.g., steps, operations, means, or components) recited in a clause, sentence, phrase, or paragraph. In one aspect, a claim may include some or all of the words recited in one or more clauses, sentences, phrases, or paragraphs. In one aspect, some of the words in each of the clauses, sentences, phrases, or paragraphs may be removed. In one aspect, additional words or elements may be added to a clause, 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.

[0094] This disclosure is provided to enable any person 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 apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects.

[0095] Unless otherwise specified, references to elements in the singular form 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.

[0096] 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 being better or more advantageous than other aspects or designs. In one aspect, the various alternative configurations and operations described herein may be considered at least equivalent.

[0097] For example, phrases such as "aspect" do not imply that such aspect is necessary for the present subject matter or that such 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, phrases such as "aspect" may refer to one or more aspects, and vice versa. For example, phrases such as "embodiment" do not imply that such embodiment is necessary for the present subject matter or that such 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, phrases such as "embodiment" may refer to one or more embodiments, and vice versa. For example, phrases such as "configuration" do not imply that such configuration is necessary for the present subject matter or that such 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, phrases such as "configuration" may refer to one or more configurations, and vice versa.

[0098] In one respect, unless otherwise stated, all measurements, numerical values, ratings, positions, grades, sizes, 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 address and with custom in the field to which they belong.

[0099] In one respect, the term "link" or similar terms can refer to a direct connection. In another respect, the term "link" or similar terms can refer to an indirect connection.

[0100] Terms such as “top,” “bottom,” “front,” and “rear” used in this disclosure should be understood to refer to any frame of reference, rather than a conventional 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.

[0101] Various items may be arranged differently (e.g., in different orders or divided in different ways), all of which do not depart from the scope of the subject matter. All structural and functional equivalents of elements throughout the various aspects of this disclosure that are known 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, the disclosure herein is not intended to be offered to the public, whether or not such disclosure is expressly recited in the claims. No element of a claim may be construed under paragraph 6 of 35 USC §112 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 “steps for…”. Furthermore, with regard to the use of the terms “comprising,” “having,” or similar terms, 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.

[0102] The title, background art, summary of the invention, brief description of the drawings, and abstract of this disclosure are hereby incorporated into this disclosure and are provided as illustrative examples rather than limiting descriptions. It should be understood upon filing this application that they are not intended to limit the scope or meaning of the claims. Furthermore, as will be apparent from the detailed description, it provides illustrative examples and, for the purpose of simplification, brings together various features in various embodiments. The methods disclosed should not be construed as reflecting an intention to include more features than expressly stated in each claim to reflect the subject matter required. Rather, as reflected in the appended claims, the subject matter of the invention lies in fewer than all features of a configuration or operation as disclosed in a single claim. The appended claims are hereby incorporated into the detailed description, wherein each claim stands independently as a separately claimed subject matter.

[0103] 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 include all legal equivalents. Nevertheless, none of the claims are intended to cover subject matter that fails to satisfy the requirements of 35 U.S.SC § 101, 102, or 103, nor should they be interpreted in this manner.

Claims

1. A flushing device for an intravenous infusion line, the flushing device comprising an inlet port configured to fluidly connect the flushing device to a fluid source, an outlet port configured to fluidly connect the flushing device to the intravenous infusion line, a flow chamber fluidly connected to the inlet port and the outlet port, a saline chamber separated from the flow chamber by a wall and configured to be filled with saline solution, one or more openings located in the wall, and one or more baffles covering each of the one or more openings from inside the flow chamber and movably coupled to the wall. When the pressure in the flow chamber is greater than the pressure in the saline chamber, the one or more baffles close each of the one or more openings. When the pressure in the flow chamber is less than the pressure in the saline chamber, the one or more baffles expose each of the one or more openings such that each of the one or more openings fluidly connects the flow chamber and the saline chamber.

2. The rinsing device according to claim 1, wherein, The outlet port is configured to connect to the infusion chamber of the intravenous infusion line.

3. The rinsing device according to claim 1, wherein, Each of the one or more openings is configured to facilitate the flow of saline from the saline chamber to the flow chamber when the pressure in the flow chamber is less than the pressure in the saline chamber.

4. The rinsing device according to claim 1, wherein, When the flow chamber is empty and the saline chamber contains at least a portion of saline solution, the pressure in the flow chamber is less than the pressure in the saline chamber.

5. The rinsing device according to claim 1, wherein, The saline chamber is formed between the wall and the outer wall of the flushing device.

6. The flushing apparatus of claim 5, further comprising a stop that presses the one or more baffles against the wall of the flow chamber, wherein the stop is slidably coupled to the wall such that when the intravenous line is coupled to the outlet port, the stop is configured to slide away from the one or more baffles and toward the inlet port.

7. The rinsing device according to claim 5, wherein, The outer wall comprises an elastic material such that when the pressure in the flow chamber is less than the pressure in the saline chamber, the outer wall is configured to arch inward toward the flow chamber.

8. The rinsing device according to claim 1, wherein, The flow chamber is adjacent to the saline chamber.

9. The flushing apparatus of claim 8, further comprising a saline inlet in the saline chamber and a saline source filled with the saline, wherein the saline inlet is configured to fluidly connect the saline source to the saline chamber.

10. The rinsing apparatus according to claim 9, wherein, The saline source includes a collapsible bag configured to collapse as the saline flows from the saline source to the saline chamber when the pressure in the flow chamber is less than the pressure in the saline chamber.

11. The flushing apparatus of claim 9, further comprising a clamp coupled to the saline inlet, wherein the clamp is configured to fluidly disconnect the saline source and the saline chamber when the intravenous line is pre-filled.

12. A flushing device for intravenous infusion lines, the flushing device comprising: A Y-shaped connector includes a first inlet leading to a flow lumen and configured to connect to a fluid source, and a second inlet leading to a saline lumen intersecting with the flow lumen; as well as A Tesla valve includes a downstream end connected to the second inlet and an upstream end configured to connect to a source of physiological saline. The flow lumen is configured to deliver fluid from the fluid source to the intravenous infusion line. The Tesla valve is configured to block the flow of fluid toward the saline source and restrict the mixing of the fluid with the saline.

13. The flushing apparatus of claim 12, further comprising the saline source, wherein the saline source is configured at a first height, the fluid source is configured at a second height, and the first height is at or below the second height, such that the saline flows through the Tesla valve when the fluid level is at or below the first height.

14. The rinsing apparatus according to claim 12, wherein, The saline lumen is configured to transport the saline solution from the saline source to the intravenous injection line after the fluid source has been emptied.

15. The rinsing apparatus according to claim 12, wherein, The flow lumen has a first diameter, the flow path in the Tesla valve has a second diameter, and the first diameter is larger than the second diameter, such that the Tesla valve is configured to slow the flow of the saline solution toward the intravenous line.

16. A flushing device for an intravenous injection line, the flushing device comprising an inlet port configured to fluidly connect the flushing device to a fluid source, an outlet port configured to fluidly connect the flushing device to the intravenous injection line, a flow channel fluidly connected to the inlet port and the outlet port, a saline channel fluidly connected to the flow channel at an intersection, a saline chamber fluidly connected to the saline channel, and a knob coupled to the flow channel and the saline channel at the intersection and including a no-flow setting, a flow setting, and a saline setting. When the knob is switched to the no-flow setting, the knob blocks the flow channel to prevent fluid from the fluid source from flowing through the flow channel, and also blocks the saline channel to prevent saline from flowing from the saline chamber into the flow channel. When the knob is switched to the flow setting, the knob allows fluid from the fluid source to flow through the flow channel and toward the outlet port, while blocking the saline channel to prevent saline from flowing into the flow channel. When the knob is switched to the saline setting, the knob blocks the flow channel to prevent fluid from the fluid source from flowing through the flow channel to the outlet port, while allowing the saline solution to flow from the saline channel into the flow channel and to the outlet port.

17. The flushing apparatus according to claim 16, wherein, The knob includes a connection channel.

18. The flushing apparatus according to claim 17, wherein, When the knob is switched to the no-flow setting, the connection channel is misaligned with the flow channel and the saline channel.

19. The flushing apparatus according to claim 17, wherein, When the knob is switched to the flow setting, the connection channel fluidly connects the flow channel and the outlet port.

20. The rinsing apparatus according to claim 17, wherein, When the knob is switched to the saline setting, the connection channel fluidly connects the saline channel and the outlet port.

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