Valve equipment

Abstract

The improved stopcock valve includes a valve body and a rotatable interference body having a bore therethrough. The valve body has at least one inlet port, at least one outlet port, and an internal cavity in communication with the at least one inlet port and the at least one outlet port. The rotatable body has an exterior surface. The bore has a first opening relative to the exterior surface and a second opening relative to the exterior surface. The interference body is disposed within the internal cavity of the valve body. The exterior surface includes a first tapered groove in communication with the first opening and a second tapered groove in communication with the second opening. The grooves are disposed to communicate with the at least one inlet port and the at least one outlet port upon rotation of the body.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit under Articles 4 and 8 of the Stockholm Act of the Paris Convention for the Protection of Industrial Property of U.S. Non-Provisional Application No. 17 / 657,505, filed March 31, 2022, which is hereby incorporated by reference in its entirety. [Background technology]

[0002] FIELD OF THE INVENTION The present invention relates generally to valve structures, preferably valve structures designed for medical infusion devices to control the flow of fluids therethrough.

[0003] Infusion devices are well known in the art and encompass multiple variations, designs, and methods for administering and controlling a selected fluid to a patient. One design uses a single camera system to capture droplets passing through a droplet chamber. The captured droplet images are processed to determine individual droplet size, droplet growth, and droplet volume. The combination of these measurements, processed by an on-board computer, calculates the flow rate. Summary of the Invention [Problem to be solved by the invention]

[0004] In these devices, precision in the valve design that controls the flow of fluid from the infusion to the patient is an issue. Conventional stopcock valves, while well known in the art, do not provide the precision needed to finely regulate the flow rate of a particular therapeutic agent, drug, fluid, etc., administered by the infusion device.

[0005] Additionally, there is a long-standing need for specialized flow valves having structural configurations that provide precise fluid control over the liquids flowing therethrough. [Means for solving the problem]

[0006] The present invention generally includes an improved stopcock valve comprising a valve body and a rotatable interference body having a through bore. The valve body has at least one inlet port, at least one outlet port, and an internal cavity communicating with the at least one inlet port and the at least one outlet port. The rotatable body has an outer surface, and the through bore has a first opening relative to the outer surface and a second opening relative to the outer surface. The interference body is disposed within the internal cavity of the valve body, and the outer surface includes a first tapered groove communicating with the first opening and a second tapered groove communicating with the second opening, the grooves arranged to communicate with the at least one inlet port and the at least one outlet port upon rotation of the body. The body is rotatably arranged to either occlude fluid flow through the valve or adjustably control fluid flow through the valve via the through bore.

[0007] In some configurations, the present invention includes an improved stopcock valve. The improved stopcock valve includes a valve body and a rotatable interference body having a through bore. The valve body has at least one inlet port, at least one outlet port, and an internal cavity communicating with the at least one inlet port and the at least one outlet port. The rotatable body has an outer surface, and the through bore has a first opening on the outer surface and a second opening on the outer surface. The interference body is disposed within the internal cavity of the valve body, and the outer surface includes at least one tapered groove communicating with at least one of the first opening and the second opening, the at least one tapered groove being arranged to communicate with at least one of the at least one inlet port and the at least one outlet port upon rotation of the body. The interference body may further include a second tapered groove communicating with the second opening.

[0008] In another configuration, the body of the improved stopcock valve is rotatably arranged to either occlude fluid flow through the valve or adjustably control fluid flow through the valve via the through bore.

[0009] In some embodiments, at least one groove-shaped aperture of the improved stopcock valve has a tip and an end, the tip having an increasing width towards the end.

[0010] In another embodiment, the rotatable interfering body of the improved stopcock valve has a rotation control member. The valve has a pair of rotation control members, and the rotation control member of the rotatable interfering body is disposed to move between the pair of rotation control members of the valve.

[0011] In a further embodiment, the rotatable interference body of the improved stopcock valve is arranged to be actuated via a motor.

[0012] In an embodiment of the interferometer having a pair of groove-shaped apertures, the groove-shaped apertures each have a tip and an end, with the width of the tip increasing towards the end.

[0013] In another configuration, the present invention may comprise an infusion device for delivering a fluid, the infusion device comprising a control system, a motor, and the improved stopcock valve. The control system is arranged to receive at least one user input. The at least one user input initiates the control system to communicate a programmable protocol to the motor, which operates the improved stopcock valve in accordance with the programmable protocol.

[0014] In another configuration, the present invention may generally comprise an infusion device for delivering a fluid, the infusion device comprising a motor and the improved stopcock valve described above.

[0015] Various embodiments are illustrated with reference to the drawings, in which corresponding reference characters indicate corresponding parts. [Brief explanation of the drawings]

[0016] [Figure 1]FIG. 1 is a cross-sectional view of an infusion device including a valve device of the present invention. [Figure 2A] FIG. 2A is a perspective view of the valve device 500. [Figure 2B] FIG. 2B is a right side view of the valve device 500. [Figure 2C] FIG. 2C is a top view of the valve device 500. [Figure 2D] FIG. 2D is a front view of the valve device 500. [Figure 3] FIG. 3 is an alternative perspective view of the valve device 500. [Figure 4A] FIG. 4A is a perspective view of the valve body 501. [Figure 4B] FIG. 4B is a left side view of the valve body 501. [Figure 4C] FIG. 4C is a top view of the valve body 501. [Figure 5A] FIG. 5A is a perspective view of a valve 550. [Figure 5B] FIG. 5B is a front view of the valve 550. [Figure 6A] FIG. 6A is a perspective view of flow control section 552 of valve 550. [Figure 6B] FIG. 6B is a right side view of flow control section 552 of valve 550. [Figure 6C] FIG. 6C is a front view of flow control section 552 of valve 550. [Figure 6D] FIG. 6D is a perspective cross-sectional view of flow control section 552 of valve 550 taken along line 6D-6D in FIG. 6A. [Figure 7] FIG. 7 is a cross-sectional view of flow control section 552 of valve 550 taken along line 7-7 in FIG. 6B. [Figure 8] FIG. 8 is an enlarged view of flow control section 552 of valve 550 of FIG. 6B. [Figure 9A] FIG. 9A is a cross-sectional view of the valve device 500 taken along line 9-9 in FIG. 2B. [Figure 9B]FIG. 9B is a cross-sectional view of the valve apparatus 500 taken along line 9-9 in FIG. 2B, showing the valve rotated from the position in FIG. 9A. [Figure 9C] FIG. 9C is a cross-sectional view taken along line 9-9 in FIG. 2B, showing the valve rotated from the position in FIG. 9B. [Figure 9D] FIG. 9D is a cross-sectional view taken along line 9-9 in FIG. 2B, showing the valve rotated from the position in FIG. 9C. DETAILED DESCRIPTION OF THE INVENTION

[0017] It should be understood that like figure numbers on different drawing figures identify identical or functionally similar structural elements, and it should be understood that the claims are not limited to the disclosed embodiments.

[0018] Furthermore, it is to be understood that this invention is not limited to the particular methods, materials, and modifications described, as such may, of course, vary. Also, it is to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the claims.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will be understood that methods, devices, or materials similar or equivalent to those described herein may be used in the practice or testing of the exemplary embodiments.

[0020] The term "substantially" is synonymous with terms such as "approximately," "approximate," "about," "approximately," "generally," "adjacent," "near," "essentially," "vicinity," and the like, and it is understood that such terms may be used interchangeably as they appear in this specification and claims. The term "proximal" is synonymous with terms such as "neighborhood," "adjacent," "neighborhood," "vicinity," "adjacent," and the like, and it is understood that such terms may be used interchangeably as they appear in this specification and claims.

[0021] It should also be understood that the terms "liquid" and "fluid" can be used interchangeably and both refer to substances that move through the present invention. Liquids or fluids may include water, saline, medicinal substances, combinations thereof, or other types of liquids or fluids that one skilled in the art of medical devices, medical care management, medical procedures, diagnostics, etc. would readily recognize as being usable in an infusion device. However, it should be understood that the present invention is not limited to use in medical infusion devices; that is, the present invention may be used in a number of applications requiring precise fluid control between two bodies or containers.

[0022] Turning now to the figures, FIG. 1 is a cross-sectional view of an exemplary infusion device 100. Infusion device 100 includes a case 101 that houses a droplet chamber 400. The droplet chamber 400 is configured to receive fluid from an IV bag attached to the top of the droplet chamber 400. Fluid 425 collects at the distal end of the droplet chamber 400 from a drop former 410. The fluid 425 is a pool of fluid that collects from individual droplets of fluid. A specialized valve device 500 is disposed at the distal end of the droplet chamber 400 in fluid communication with the droplet chamber 400. The specialized valve device 500 controls the flow rate of the fluid 425 delivered to a patient in fluid communication with the distal end of the specialized valve device 500. The specialized valve device 500 is preferably driven by the motor shaft of a motor 600. In a preferred embodiment, the motor shaft of motor 600 actuates specialized valve assembly 500 according to a programmed protocol corresponding to the fluids and / or substances selected for delivery to the patient.

[0023] 2A-9D, described below, generally illustrate the components of a specialty valve of an infusion device. The specialty valve device 500 is the flow control mechanism for the fluids and / or liquids of the infusion device 100. The specialty valve device 500 is driven by a motor (shown in FIG. 1) according to a programmable protocol communicated from a control system in response to selected user input, i.e., the selection of a particular medication, liquid, or fluid protocol entered into the infusion device 100. The actuation of the specialty valve device 500 by the motor is further controlled by the control system such that the actuation of the specialty valve device 500 varies in response to calculations determined by the control system.

[0024] 2A-2D, the specialized valve device 500 generally includes a specialized valve body 501 and a specialized valve 550. The specialized valve body 501 is configured to receive the specialized valve 550 therein. In a preferred embodiment, snap-fit ​​elements on both the specialized valve body 501 and the specialized valve 550 interact to rotatably secure the specialized valve 550 within the specialized valve body 501. The specialized valve 550 includes a flow restriction 552 (shown in FIG. 3), which is a rotatable interference element disposed within the specialized valve body 501. The flow restriction 552 is positioned such that rotation of the valve 500 completely prevents the flow of liquid through the specialized valve device 500, decreases or increases the flow of liquid through the specialized valve device 500, or only slightly or not at all interferes with the flow of liquid through the specialized valve device 500. These positions are described in more detail below with reference to FIGS. 9A-9D.

[0025] 3 is another perspective view of the specialized valve device 500. The specialized valve body 501 includes a valve housing 502. The valve housing 502 is positioned to rotatably secure the specialized valve 550 therein, particularly the flow control portion 552 of the specialized valve 550. The specialized valve body 501 also includes a flow body portion 503 defined by an inlet end 504 and an outlet end 505. The valve housing 502 is positioned between the inlet end 504 and the outlet end 505. In a preferred embodiment, the valve housing 502 is positioned closer to the inlet end 504 than to the outlet end 505.

[0026] Specialized valve 550 generally comprises a rotary control section 551 and a flow control section 552. In a preferred embodiment, rotary control section 551 and flow control section 552 are integral. However, rotary control section 551 and flow control section 552 may also be two separate components that are securely fastened together, such as by a snap fit or screw fastening.

[0027] 3 further illustrates the rotation control members 506, 507 of the specialized valve apparatus 500. The rotation control members prevent the specialized valve 550 from over-rotating within the specialized valve body 501. That is, the specialized valve 550 rotates only between the rotation control members of the specialized valve body 501. The specialized valve body 501 has two rotation control members: an upper rotation control member 506 and a distal rotation control member 507. The upper rotation control member 506 is fixedly secured to the exterior surface of the valve housing 502 near the inlet end 504 and near the rotation control portion 551 of the specialized valve 550. The distal rotation control member 507 is fixedly secured to the exterior surface of the valve housing 502 proximal to the outlet end 505 and near the rotation control portion 551 of the specialized valve 550. The specialized valve 550 also includes a rotation control member 553. The rotation control member 553 is preferably located on the distal face 551a of the rotation control section 551 of the specialized valve 550. When the specialized valve 550 is properly engaged within the specialized valve body 501, the rotation control member 553 is located between the upper rotation control member 506 and the distal rotation control member 507. In a preferred embodiment, the amount of rotation of the specialized valve 550 before the rotation control member 553 contacts either the upper rotation control member 506 or the distal rotation control member 507 is less than approximately 180 degrees.

[0028] The following description will be made with reference to Figures 4A-4C. Figures 4A-4C are various views illustrating specialized valve body 501 without specialized valve 550 inserted. As shown, flow control section 552 of specialized valve 550 is positioned to snap-fit ​​within valve aperture 509. Flow control section 552 of specialized valve 550 includes attachment means (described below). As shown in Figure 6, attachment means is arranged to interact with valve attachment means 509a, e.g., via a snap fit such as a tongue and groove or other snap-fit ​​attachment means known in the art, to secure flow control section 552 within valve aperture 509. Attachment body 508 is positioned adjacent to and defines inlet end 504 of flow body 503. Attachment body 508 is positioned to mate with the distal end of a drip chamber of the infusion device, thereby allowing flow from the drip chamber to enter upper flow channel 510. The upper flow passage 510 is located above the valve housing 502 and near the inlet end 504. That is, the upper flow passage begins at the inlet end 504 and terminates at an opening to the valve housing 502. The specific location of the upper flow passage 510 is described in more detail below.

[0029] The following description will be made with reference to Figures 5A and 5B, which are perspective and front views, respectively, of specialized valve 550. Flow control section 552 extends from distal surface 551a of rotation control section 551 of specialized valve 550. Outer surface 552a of flow control section 552 of specialized valve 550 is provided with valve attachment means 509b of flow control section 552. As shown in Figure 3, valve attachment means 509b is arranged to mate, engage, etc. with valve attachment means 509a of valve aperture 509 (shown in Figure 4A), for example, via a snap fit, such as a tongue and groove, or other snap-fit ​​type attachment means known in the art, to secure flow control section 552 within valve aperture 509. Additionally, a first opening 561 of an intermediate flow path 560 is disposed on the outer surface 552a of the flow control portion 552, and a second opening 562 (shown in FIG. 6D) is disposed on the opposite outer surface 552a of the flow control portion 552. The intermediate flow path 560 is a channel, tube, etc., and is configured to connect the upper flow path 506 (shown in FIG. 9A) and the distal flow path 507 (shown in FIG. 9A) when the specialized valve 550 is rotated to a specific angle within the valve aperture 509.

[0030] FIG. 5B shows a first space 551b and a second space 551c provided in the rotation control section 551. The first space 551b and the second space 551c are voids, spaces, or gaps within the rotation control section 551 and are arranged to receive a motor shaft end member. To rotate the valve 550 (shown in various positions in FIGS. 9A-9D), the engaged motor shaft end member applies force to the outer surfaces of the first space 551b and the second space 551c, thereby changing the position of the first opening 561 and the second opening 562 of the intermediate flow passage 560 (shown in dashed lines in FIG. 5B) and controlling the flow of liquid therethrough. The central through-bore in which the intermediate flow passage 560 is located may be used as an engagement position so that the motor shaft engages with the specialized valve 550 for actuation.

[0031] Alternatively, the rotary control 551 may be a lever mechanism such as a gate valve or stock-cock. Alternatively, the rotary control 551 may be in the shape of a handle or a crutch head from which the flow control 552 may extend. In these alternative examples of the rotary control 551, the valve 550 may be manually rotated for alternative uses of the valve 550.

[0032] The following description will be made with reference to Figures 6A-6D. Figures 6A-6C illustrate flow control section 552 removed from specialized valve 550. Figure 6D is a cross-sectional view of flow control section 552 taken along line 6D-6D shown in Figure 6A. As can be best seen in Figures 6C and 6D, intermediate flow path 560 intersects a substantially central portion of flow control section 552. Intermediate flow path 560 has two oppositely disposed openings, first opening 561 and second opening 562.

[0033] 7 is a cross-sectional view of flow control portion 552 taken along line 7-7 in FIG. 6B. First opening 561 and second opening 562 of flow control portion 552 have first tapered groove 561a and second tapered groove 562a extending from their respective openings. First tapered groove 561a extends from first groove opening 561b at first groove end 561b to first groove tip 561c. First tapered groove 561a opens at outer surface 552a of flow control portion 552 and extends to first groove floor 561d and first groove opening 561e. The first tapered groove 561a merges with the intermediate channel 560 at a first groove opening 561e, thereby placing the first tapered groove 561a in fluid communication, i.e., placing the first tapered groove 561a and the intermediate channel 560 in liquid communication. The second tapered groove 562a extends from a second opening 562 at a second groove end 562b to a second groove tip 562c. The second tapered groove 562a opens at an outer surface 552a of the flow control portion 552 and extends to a second groove floor 562d and a second groove opening 562. The second tapered groove 562a merges with the intermediate flow path 560 at the second groove opening 562e, thereby placing the second tapered groove 562a in fluid communication, i.e., the second tapered groove 562a and the intermediate flow path 560 in liquid communication.

[0034] The following description will be made with reference to FIGS. 7 and 8. The following description will focus on the first opening 561 and the first tapered groove 561a, but also applies to the second opening 562 and the second tapered groove 562a. FIG. 8 is a partial enlarged view of the flow control portion 552 shown in FIG. 6B. As previously described, the first tapered groove 561a extends from the first groove end 561b and terminates at the first groove tip 561c. The first tapered groove 561a is defined by a varying depth and width. The depth of the first groove end 561b, i.e., the distance from the outer surface 552a to the first groove opening 561e, is greater than the depth of the first groove tip 561c, i.e., the distance from the outer surface 552a to the end of the first groove floor 561d near the first groove tip 561. The depth of the first tapered groove 561a gradually decreases from the first groove end 561b toward the first groove tip 561c. The first groove floor 561d is disposed to terminate at the first groove tip 561c and is flush with the outer surface 552a. The first groove opening 561b has a width W1. The width W1 is greater than the width W2 of the first tapered groove 561a near the first groove tip 561c. The width of the first tapered groove 561a gradually decreases from the first groove end 561b toward the first groove tip 561c, and the first tapered groove 561a terminates at the first groove tip 561c, i.e., has no width at the first groove tip 561c. In particular, as best shown in FIG. 8 , first groove opening 561 e of first opening 561 of intermediate flow channel 560 is defined by a substantially V-shaped opening 563 that meets inner surface 560 a of intermediate flow channel 560, with the bottom of the “V” curving in a direction toward second opening 562 of intermediate flow channel 560. This is illustrated schematically in FIG. 7 . Similarly, second groove opening 562 e of second opening 562 of intermediate flow channel 560 is defined by a substantially V-shaped opening 564 that meets inner surface 560 a of intermediate flow channel 560, with the bottom of the “V” curving in a direction toward first opening 561 of intermediate flow channel 560. This is illustrated schematically in FIG. 7 .

[0035] 9A-9D, which illustrate various positions of the flow control section 552 of a valve 550 as it rotates within the valve body 501. It should be understood that the illustrated positions of the flow control section 552 are merely exemplary. The flow control section 552 may be rotated in finer increments to accommodate a particular flow rate of liquid. The liquid flows from the upper flow passage 510 through the intermediate flow passage 560 to the distal flow passage 511 and then out of the distal flow passage 511 at respective openings near the outlet end 505 of the valve body 501.

[0036] 9A shows the valve device 500 in a closed position, i.e., no liquid flows from the upper flow path 510 through the intermediate flow path 560 to the distal flow path 511. Specifically, the outer surface 552a of the flow control portion 552 of the valve 500 seals the second opening 510b of the upper flow path 510 and the first opening 511a of the distal flow path 511.

[0037] 9B illustrates a partially open position of the valve device 500. That is, there is minimal flow from the upper flow channel 510 through the intermediate flow channel 560 to the distal flow channel 511. In the partially open position, liquid may flow into the first opening 510a of the upper flow channel 510, through the second opening 510b of the upper flow channel 510, and into the second tapered groove 262a. Specifically, liquid flows into the region of the second tapered groove 562a near the second groove apex 562c, and the liquid enters the intermediate flow channel 560 through the second groove opening 562b. The liquid then travels within the intermediate flow channel 560 in a direction toward the first opening 561, where the liquid enters the distal flow channel 511 at the first opening 511a and exits the distal flow channel 511 through the second opening 511b. Specifically, liquid flows out of the intermediate flow path 560 through the first opening 561b of the first tapered groove 561a, moves toward the first groove tip 561a, and the liquid flows into the distal flow path 511 at the first opening 511a.

[0038] 9C shows the valve device 500 in a substantially open position. That is, a moderate amount of liquid flows from the upper flow channel 510 through the intermediate flow channel 560 to the distal flow channel 511. In the substantially open position, liquid may flow into the first opening 510a of the upper flow channel 510, through the second opening 510b of the upper flow channel 510, and into the second opening 562 of the second tapered groove 562a of the intermediate flow channel. Specifically, the liquid flows into a region that partially includes the second tapered groove 562a near the second groove end 562b, and then flows partially and directly into the intermediate flow channel 560. The liquid then flows in the intermediate flow channel 560 in a direction toward the first opening 561, enters the distal flow channel 511 at the first opening 511a, and exits the distal flow channel 511 via the second opening 511b. Specifically, liquid flows out of the intermediate flow path 560 partially through the first opening 561b of the first tapered groove 561a, partially through the first groove opening 561b, and into the distal flow path 511 at the first opening 511a.

[0039] Figure 9D shows the valve device 500 in a fully open position. That is, the arrangement shown in Figure 9D maximizes the flow of liquid from the upper channel 510 through the intermediate channel 560 to the distal channel 511 because all of the respective channels are unrestrictedly aligned, as shown in Figure 9D.

[0040] It should be understood that the first tapered groove 561a or the second tapered groove 562b and the inner surface of the valve aperture 509 form a sealed tunnel to prevent the escape of liquid flowing through the flow control section 522 to the first opening 561 or the second opening 562.

[0041] In this way, the objects of the present invention can be effectively achieved. Those skilled in the art will easily envision modifications and variations of the present invention, which are intended to be encompassed within the scope of the appended claims. [Explanation of symbols]

[0042] 100: Infusion device 101: Case of infusion device 100 400: Droplet chamber 410: Droplet forming portion of droplet chamber 400 425:Fluid 500: Special valve device 501: Special valve body of special valve device 500 502: Valve housing of valve body 501 503: Flow body portion of the valve body 501 504: Inlet end of flow body 503 505: Outlet end of flow body 503 506: Upper rotation control member 507: Distal rotation control member 508: Mounting body of valve body 501 509: Bulb Aperture 509a: Valve mounting means of valve aperture 509 509b: Valve mounting means of flow control section 552 510: Upper flow channel 510a: First opening of upper channel 510 510b: second opening of upper channel 510 511: Distal channel 511a: First opening of distal flow channel 511 511b: second opening of distal channel 511 550: Special valve 551: Rotation control section of special valve 550 551a: Distal surface of rotation control section 551 551b: First space of rotation control section 551 551c: Second space of rotation control section 551 552: Flow control section of special valve 550 552a: Outer surface of flow control section 552 553: Rotation control member of special valve 550 560: Intermediate flow path 560a: inner surface of intermediate flow path 560 561: First opening of intermediate flow channel 560 561a: First tapered groove of the first opening 561 561b: First groove end of the first tapered groove 561a 561c: First groove tip of the first tapered groove 561a 561d: First groove floor of the first tapered groove 561a 561e: First groove opening of the first tapered groove 561a 562: Second opening of intermediate flow channel 560 562a: second tapered groove of second opening 562 562b: second groove end of second tapered groove 562a 562c: second groove tip of second tapered groove 562a 562d: second groove floor of second tapered groove 562a 562e: second groove opening of second tapered groove 562a 563: V-shaped opening to inner surface 560a 564: V-shaped opening to inner surface 560a 600: Gearbox / Motor W1: First width of the first tapered groove 561a W2: second width of the first tapered groove 561a

Claims

1. 1. An improved stopcock valve for a low pressure device, comprising: A valve body; a rotatable interference body; Equipped with the valve body having at least one inlet port, at least one outlet port, and a first through bore communicating with the at least one inlet port and the at least one outlet port; the first through bore has a first annular snap-fit ​​portion; the rotatable interference body has a second through bore and an outer surface; the second through bore has a first opening relative to the outer surface and a second opening relative to the outer surface; the outer surface of the rotatable interference body has a second annular snap-fit ​​portion configured to secure the rotatable interference body to the first annular snap-fit ​​portion of the first through bore of the valve body; the outer surface includes a first tapered groove communicating with the first opening and a second tapered groove communicating with the second opening; the first and second tapered grooves are disposed to communicate with the at least one inlet port and the at least one outlet port upon rotation of the body; the first tapered groove and the second tapered groove each have a leading end and an end that define a curved groove bottom; the ends have a V-shaped opening to the inner surface of the second through bore, the curved groove bottom of each end being curved in a direction toward the opening on the opposite side; the rotatable interference body is rotatably disposed to either block fluid flow through the valve body or adjustably control fluid flow through the valve body via the second throughbore.

2. 2. The improved stopcock valve of claim 1, wherein said tip increases in width toward said end.

3. the rotatable interference body has a rotation control member; The improved stopcock valve has a pair of rotary control members, 2. The improved stopcock valve of claim 1, wherein the rotation control member of the rotatable interference body is disposed to move between the pair of rotation control members of the improved stopcock valve.

4. 2. The improved stopcock valve of claim 1, wherein the distal ends of the first and second tapered grooves increase in depth toward the ends of the first and second tapered grooves.

5. 10. An infusion device comprising the improved stopcock valve of claim 1.

6. 1. An improved stopcock valve for a low pressure device, comprising: A valve body; a rotatable interference body; Equipped with the valve body having a proximal throughbore, a collinear distal throughbore, and an intermediate throughbore in fluid communication with the proximal and distal throughbores; the intermediate throughbore has an inner surface and is disposed perpendicularly between the proximal throughbore and the distal throughbore; the rotatable interference body comprises a rotation control portion and a flow control portion extending from the rotation control portion; the flow restrictor has a through bore, the through bore having a first opening and a second opening; the first opening and the second opening each extend into a tapered groove; the tapered groove has a tip and an end that define a curved groove bottom; the end has a V-shaped opening to the inner surface of the through bore, the curved groove bottom of the end being curved in a direction toward the opening on the opposite side; 1. An improved stopcock valve for low-pressure equipment, characterized in that the rotatable interference body is rotatably fixed within the intermediate throughbore, and the flow restriction is snap-fit ​​within the intermediate throughbore of the valve body such that the inner surface of the intermediate throughbore substantially surrounds the flow restriction.

7. 7. The improved stopcock valve for low pressure equipment of claim 6, wherein the rotatable interference body has an outer surface, and the first and second openings extend through the outer surface.

8. 7. An improved stopcock valve for low-pressure equipment according to claim 6, wherein said tapered groove increases in width from said tip to said end.

9. 9. An improved stopcock valve for low-pressure equipment according to claim 8, wherein said tapered groove increases in depth from said tip end to said end end.

10. the rotatable interference body has a rotation control member, the valve body has a pair of rotation control members, 7. An improved stopcock valve for low pressure equipment as defined in claim 6, wherein said rotation control member of said rotatable interference body is disposed to move between said pair of rotation control members.

11. 11. The improved stopcock valve for low pressure equipment according to claim 10, wherein the rotation control member has at least one space, the at least one space being adapted to engage with a device for actuating the rotatable interference body.

12. the first and second tapered grooves are disposed to communicate with the proximal and distal throughbores upon rotation of the rotatable interference body; 7. The improved stopcock valve for low pressure equipment according to claim 6, wherein the rotatable interference body is rotatably disposed to either occlude fluid flow through the valve body or adjustably control fluid flow through the valve body via the through bore.

13. 13. An infusion device comprising the improved stopcock valve of claim 12.

14. 1. A rotatable interference body for a stopcock valve, comprising: A rotation control unit; a flow control portion extending from the rotation control portion; Equipped with the flow restrictor has a through bore, the through bore having a first opening and a second opening; the first opening and the second opening each extend into a tapered groove; the tapered groove has a tip and an end that define a curved groove bottom; 1. A rotatable interference body for a stopcock valve, wherein the end has a V-shaped opening to the inner surface of the through bore, and the curved groove bottom of the end curves in a direction toward the opening on the opposite side.

15. 1. An improved stopcock valve, comprising: A valve body; A rotatable interference body according to claim 14; Equipped with the valve body having a proximal throughbore, a collinear distal throughbore, and an intermediate throughbore in fluid communication with the proximal and distal throughbores; the intermediate throughbore has an inner surface and is disposed perpendicularly between the proximal throughbore and the distal throughbore; 10. The improved stopcock valve, wherein the flow restriction is snap-fit ​​within the intermediate throughbore of the valve body such that the rotatable interference body is rotatably fixed within the intermediate throughbore.

16. 16. The improved stopcock valve of claim 15, wherein the interior surface of the intermediate throughbore substantially surrounds the flow restrictor.

17. the tip is configured to increase in depth towards the end and the tip is configured to increase in width towards the end, or 15. The rotatable interference body for a stopcock valve of claim 14, wherein the tip is configured to increase in depth toward the end or the tip is configured to increase in width toward the end.

18. 16. An infusion device comprising the improved stopcock valve of claim 15.

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