Patent Application
20240042190
The present invention relates to the delivery of medical fluids to patients by syringes and, more particularly, to a valve for the selected delivery of medical fluids to a patient from two or more syringes by a single-handed operation.
Delivery of medication to a target space or tissue in the body is required for management of the symptoms and treatment of various disease processes, for example the delivery of injectable medication used to treat the symptoms of osteoarthritis. Delivery of medication into the target space is essential for optimal function of the medication and for optimal clinical benefit to the patient. Delivery of medication into a target space/tissue in the body can be achieved through the skin with a needle and syringe combination for superficial targets. For superficial target medication injection, the miss rate can be up to 20% using clinical landmarking for needle guidance.
The accuracy of injection can be improved with image guidance for the placement of the needle. Deeper targets in the body typically require imaging guidance with CT, fluoroscopy or less commonly MM. Access to deep tissues in the body can also be achieved through the vascular system with the use of a catheter and wire combination, for example during the delivery of chemotherapeutic medication for the treatment of liver cancer. Almost any target space in the body can be reached accurately, safely, and rapidly with the use of medical imaging guidance of a needle or catheter/wire combination. Superficial spaces are typically well visualized with ultrasound, while deeper spaces can be accessed with fluoroscopy, CT, or MM.
A rate limiting step during any type of medication injection procedure is the need to switch syringes attached to the needle or catheter. Typically, several medications are injected during a procedure. Initially, the operator will inject a local anesthetic under the skin, then advance the needle into the target space or tissue and switch the syringe containing anesthetic for another syringe containing the medication of interest. This is then injected into the target space or tissue.
For certain procedures, the operator may need to inject another medication or a contrast agent to confirm the position of the needle or catheter within the target. This generally requires another syringe exchange and adds to the length of the procedure. For some procedures, serial syringe exchanges are required to complete the procedure as for example during trans-vascular trans-catheter embolization of a liver tumor. The syringe exchanges add to the time required for the procedure, which is known to be inversely related to patient satisfaction with a procedure. In addition, serial syringe exchanges can add to the risk of a procedure.
For image guided procedures, the operator may require the use of one hand for the operation of the imaging device, for example an ultrasound probe. The requirement to switch syringes or use the second hand to operate a valve switching between syringes necessitates the operator to put down the transducer probe, thus losing sight of the needle and target. The time required for switching the syringe or a valve with the other hand not only delays the completion of the procedure but introduces the potential for displacement or misplacement of the needle, which had been carefully positioned into a target. For trans-vascular procedures, this syringe switching introduces additional risk to the procedure.
This is related to the fact that the catheter connection with the syringe must be without air, which can be a source of unwanted embolization. There is always a small chance of air bubbles collecting in the system when a syringe exchange is performed. A careful purging of the system must be performed and a carefully performed “wet to wet” connection of the syringe and catheter, limiting the chance for air bubbles but adding to the technical complexity and introducing the potential for error. Should the needle or catheter become dislodged from the target while the syringe is being exchanged, which can occur when the scale of the target is small and very subtle motion introduced during the handling of the needle or catheter/syringe combination during a syringe exchange could dislodge the needle or catheter. In such a case, the target will need to be acquired again under image guidance before the target is injected with the desired medication, prolonging the procedure, and increasing the risk to the patient.
Embodiments of invention are designed to benefit the operator and the patient regarding the risks described above. The benefits arise from the fact that embodiments of the invention provide a valve and assembly system that can be held and operated with one hand to switch between syringes and to deposit the contents of the syringes or use a syringe for aspiration. This enables the operator freedom to use the other hand to hold for example an ultrasound probe enabling image guidance during the procedure, or to manipulate a catheter.
The ability to continuously monitor the position of the needle or catheter during the procedure is thus enabled—the operator may switch between syringes attached to the valve to select the desired syringe for operation with the same hand that he or she holds the entire assembly. The procedure can thus be performed faster and safer.
In embodiments, the invention is designed such that it enables operation of the valve with the thumb of the hand holding the entire assembly, including the valve and the syringes connected to the valve. The ability to control the valve position while holding the entire assembly in one hand is a unique feature not available with any of the prior devices. This feature is essential for the benefits of the current valve and system in embodiments of the invention.
In embodiments, the design feature of the valve that enables one handed control of the assembly (needle-valve-syringe or catheter-valve-syringe) and operation of the valve handle is that the handle extends to the base of the syringes, where the operator holds the assembly by the syringe finger tabs with the index and middle fingers. With this design, the operator can use the thumb for either operation of the syringe plunger for injection of the liquid contained in the syringe cylinder or alternatively for the operation of the valve handle to select which syringe will be operational.
Numerous objects, features and advantages of the present invention will be readily apparent to those of ordinary skill in the art upon a reading of the following detailed description of presently preferred, but nonetheless illustrative, embodiments of the present invention when taken in conjunction with the accompanying drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of descriptions and should not be regarded as limiting.
As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods, and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.
For a better understanding of the invention, its operating advantages and the specific objects attained by its uses, reference should be had to the accompanying drawings and descriptive matter in which there are illustrated embodiments of the invention.
The following drawings illustrate by way of example and are included to provide further understanding of the invention for the purpose of illustrative discussion of the embodiments of the invention. No attempt is made to show structural details of the embodiments in more detail than is necessary for a fundamental understanding of the invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the invention may be embodied in practice. Identical reference numerals do not necessarily indicate an identical structure. Rather, the same reference numeral may be used to indicate a similar feature of a feature with similar functionality. In the drawings:
The detailed embodiments of the present invention are disclosed herein. It should be understood, however, that the disclosed embodiments are exemplary of the invention, which may be embodied in various forms. Therefore, the details disclosed herein are not to be interpreted as limiting, but merely as a basis for teaching one skilled in the art how to make and/or use the invention.
Reference throughout this specification to “one embodiment” or “an embodiment” means that particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearance of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The valve body 14 further includes, as representatively shown in this embodiment, two inlet orifices or ports 20a and 20b to which syringes 22 are removably connected. The syringe ports 20a and 20b may be formed by or part of a Luer-Lock connector or coupling. For example, the syringe ports 20a and 20b may each be part of a female Luer-Lock portion and the syringes 22 may include a male Luer-Lock portion that detachably rotatingly couples the with the female Luer-Lock portion.
Importantly, each of the syringe ports 20a and 20b are configured such that the barrels 24 of the syringes 22, when the syringes are connected to a respective syringe port, are disposed in a spaced, parallel relation to each other. Further, the syringe ports 20a and 20b are disposed on a diametrically opposite side of the valve body 14 from the needle port 16.
As best seen in
The stop cock 26 is rotatable between various states or positions to selectively align only one syringe port 20a or 20b at a time with the needle port 16, while isolating the other syringe port from the needle port. Specifically, with reference to
The valve 12 further includes a handle 34 that is connected to the stop cock 26 and manipulable to rotate the stop cock. Importantly, the handle 34 is configured to be operated at a distance from axis 36 of the valve 12, such that a thumb or finger can manipulate the valve into the intended position in a patient, opening one port and closing another and depressing or retracting the plunger syringe as needed. Specifically, handle 34 extends outwardly from the valve 12 in the direction in which the syringes 22 extend and terminates at a free end 36. The length of the handle 34 is selected such that the free end 36 thereof is disposed adjacent or in proximity to the finger tabs 38 of the syringes. To this end, valve 12 enables one handed control of the assembly 10 (needle-valve-syringe or catheter-valve-syringe) and operation of the valve handle 34 is that the handle extends to the base of the syringes 22, where the operator holds the assembly by the syringe finger tabs 38 with the index and middle fingers. In the simplest embodiment, the valve handle 34 is positioned such that its long axis travels along the minimum excursion arc along the circumference of the valve body between openings of the individual syringe ports 20a and 20b. With this design, the operator can use the thumb for either operation of the syringe plunger 40 for injection of the liquid contained in the syringe cylinder or alternatively for the operation of the valve handle 34 to select which syringe will be operational.
In embodiments, the arrangement of the syringe ports 20a and 20b for syringe attachment has specific requirements which enable its intended use to be achieved. The limitation on the position of the syringe ports 20a and 20b along the circumference of the valve body 14 must be opposite to the needle port 16 and arranged such that the closest position of the needle ports relative to one another is limited by the cross-sectional diameter of the syringe cylinders 24 attached to the ports (i.e., larger volume syringes have by design larger cross section diameter with limits the position of ports to the distance between the longitudinal axis of the syringe cylinders).
Therefore, the valve can be provided with various configurations of the syringe ports for the use with various diameter syringes. Smaller diameter syringes will be able to be placed closed together while larger caliber syringes will be accommodated by further spacing of the syringe ports along the circumference of the valve body.
In
Further, in this embodiment, stop cock 26 includes a single flow passage 40 that is frustoconical shaped at its distal end and cylindrically shaped at is proximal end to be aligned with syringe ports upon turning the stop cock. The stop cock 26 is rotatable between various states or positions to selectively align only one syringe port 20b, or 20c at a time with the needle port 16, while isolating the other syringe ports from the needle port.
The valve body 42 and stop cock 44 are configured such that the stop cock is movable in two axes of motion as compared to a single axis of motion of the previously described embodiments. Particularly, with reference to
As shown in
As shown in
While the invention has been particularly shown and described with respect to the illustrated embodiments thereof, it will be understood by those skilled in the art that the foregoing and other changes in form and details may be made therein without departing from the spirit and scope of the invention.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IB2021/053617 | 4/30/2021 | WO |
