Stopcock

Abstract: A stopcock comprises a tubular outer body having at least two radial openings being on the same transverse cross-sectional plane of said body; and a hollow core member snugly fitting into said outer body and having a first open end and a second, closed end, said member being connected to or integral with a handle at said second end; said member having at least one radial bore; and being rotatable within said body between a first state in which said bore is in register with a first of said at least two openings and a second state in which said bore is in register with a second of said at least two openings.

Description: The present invention relates to a stopcock for a medical infusion system. GB 2 005 807 A discloses a stopcock of the above-mentioned type, having the features cited in the preamble of claim 1 for use in connection with a urimeter. The hollow core member has three radial passages, two of them located 180° opposite to each other. The third passage is located at a right angle between these passages at a side of the core member. All passages have the same diameter. Conventional stopcocks may be made of plastic, glass or metal and typically comprise an outer tubular body provided with two or more luer-type connectors and, rotatable therein, a solid core member provided with bores adapted to come into register with a lumen of the luer connectors and allowing transfer of fluid from one connector to another. The core member is connected or integral with a handle which allows the user to select between different states. Luer connectors in medical devices must conform with international standards with regard to their inner and outer dimensions. This limits their lumen diameter to a maximum of about 3.0 mm. In laparoscopic surgery, for example, a body cavity, e.g. the peritonium, is first inflated with a gas such a CO2 which process is termed insufflation". Insufflation is a rather slow process, in contrast the release of the gas from the body cavity, which process is termed disufflation", which is usually a very fast process, lasting a few seconds. In conventional stopcocks, the connector is connected to the duct leading to the body cavity (the body duct"), being linked to a connector connected to the duct leading to the gas source (the gas duct") during insufflation, and switched so as to be linked to an opening from which the gas is discharged (the gas discharge opening"), during disufflation. Due to the limits of the lumen diameter, conventional stopcocks are not used or are used only to a limited extent in such a procedure. It is the object of the present invention to provide a stopcock of the above-mentioned type which is better applicable in connection with medical infusion equipment, especially of international standard, and in connection with laparoscopic surgery. This object is attained by a stopcock for a medical infusion system, having the features cited in claim 1. The diameter of the lumen of the hollow core member can be any chosen diameter and is not limited to the diameter of the luer connector as in conventional stopcocks. This may be used to advantage in allowing a differential flow rate at different operational states of the stopcock. For example, the first opening may be fitted with a luer connector of a conventional type, permitting flow of fluids in or from the lumen of the core member which connect to a duct at its open end at a rate limited by the diameter of the luer connector, and the second opening is of a substantially larger diameter. In order to achieve this feat, the radial bore in said core member has a diameter at least that of said second opening. The maximal flow rate is obviously limited by the diameter of the lumen of the hollow core which should thus also be the same or larger than that of the second opening. A preferred embodiment of the invention, as pointed out above, is a stopcock adapted for use in a laparoscopic surgery system. The invention will at times be described with specific reference to this preferred embodiment it being understood that the invention is not limited thereto. In accordance with this preferred embodiment, a first of said openings in the tubular outer body is fitted with a radially extending luer connector having typically an inner diameter of about 2-3 mm, and a second of said openings is a discharge opening, of a larger diameter than the inner diameter of the luer connector. In this preferred embodiment, the duct to the opening at said one end of the hollow core member is connected to the body duct, and the luer connector is connected to the gas duct. In the insufflation state of the device according to the preferred embodiment, said bore is in register with the luer connector whereupon gas flows into the hollow lumen of the core member and from there into the body duct, i.e. leading gas to a body cavity such as the peritoneum, whereupon the body cavity is inflated. In the disufflation state, the bore is brought to be in register with the discharge opening (which, as pointed out above has a larger diameter than the luer connector) and thus gas expressing from the body cavity through the body duct enters the lumen of the hollow core member, and then escapes out of this gas discharge opening. In the following, the invention will be illustrated by a description of some non-limiting specific embodiments, with reference to the annexed drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a stopcock according to one embodiment of the invention; Fig. 2 is a cross-sectional view along line II-II in Fig. 1, showing the stopcock in a first position; Fig. 3 is a cross-section similar to that of Fig. 2 showing the stopcock in a second position; Fig. 4 is a perspective view of a stopcock according to another embodiment of the invention; Fig. 5 is a cross-sectional view along line III-III in Fig. 4 showing the stopcock in a first position; Fig. 6 is a cross-section similar to that of Fig. 5 showing the stopcock in a second position; Fig. 7 shows a longitudinal cross-section through a specific embodiment of a stopcock of the invention; Fig. 8 is a view from the direction of arrow VIII in Fig. 7 showing the stopcock in three operational states: insufflation state (Fig. 8a), an intermediate, "OFF" state (Fig. 8b), and a disufflation state (Fig. 8c) and Fig. 9 is a partial cross-section of a stopcock according to another embodiment of the present invention. DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS Stopcock 10 shown in Figs. 1-3 comprises a tubular outer body 12 and a core member 14 having a lumen 15, snugly fitting into said outer body. Lumen 15 is open at end 16 and closed at the other end which is fitted with an integral handle 18. Core member 14 is rotatable within tubular body 12 by means of handle 18. Tubular body 12 has two radial openings opposite one another, one being a female luer type connector 20 and a discharge opening 22 having a substantially larger diameter than the inner diameter of the luer connector. Connector 20 and opening 22 are on the same transverse cross-sectional plane. Typically, the lumen of the luer connector has a diameter of about 2-3 mm whereas the diameter of the discharge opening is about 5 mm. Core member 14 has a radial bore 24 extending out from lumen 15 and having a diameter essentially the same as that of the discharge opening 22. In accordance with a preferred embodiment of the invention, the stopcock is used in a laparoscopic surgery system. In this kind of application, lumen 15 is connected to a body duct whereas luer connector 20 is connected to a gas duct. By rotation of core member 14, the lumen may be connected either to the luer connector 20 or to the discharge opening 22 for insufflation or disufflation, respectively. In the disufflation state, shown in Fig. 2, bore 24 is in register with opening 22 whereupon gas can flow through lumen 15 out of opening 22, as represented by the arrows in Fig 1. For insufflation, the handle is rotated by 180° whereupon bore 24' comes to be in register with luer connector 20 and gas can flow into lumen 15 from the gas duct (not shown), thus inflating the body cavity. Reference is now being made to Figs. 4 and 5 showing another embodiment of a stopcock of the invention. This stopcock is very similar to that shown in the embodiment of Figs. 1-3 and the same reference numerals were used with a prime indicator for like elements; the reader is thus referred to the description of the embodiment of Figs. 1-3 for their explanation. The difference between the stopcock of the embodiment shown in Figs. 4-6 versus that of Figs. 1-3 in that that rather than a single bore 24 in the core member the core member 14' in the embodiment of Figs. 4-6 has two bores, one 24' of a diameter essentially the same as discharge opening 22' and another, 26 of a diameter essentially the same as that of the inner diameter of luer connector 20'. Bores 26 and 24 are angularly disposed from one another on the same transverse cross-sectional plane, e.g. by about 90°. Thus, the switching between the disufflation state, shown in Fig. 5, to the insufflation state shown in Fig. 6, and vice versa, requires turning of handle 18' by less than 180°, e.g. by about 90°. As can be seen in Fig. 5, in the disufflation state, bore 24' is in register with opening 22', whereby gas coming from gas duct and entering lumen 15' can egress through discharge opening 22'. In the insufflation state, shown in Fig. 6, radial bore 26 is in register with the lumen of connector 20' whereupon gas can flow from the gas duct (not shown) through lumen 15' and into the body cavity. Reference is now being made to Fig. 7 showing a longitudinal cross-sectional view through a stopcock according to a specific embodiment of the invention. Stopcock 30 shown in Fig. 7 comprises a tubular outer body 32 and a core member 34 having a lumen 36. Tubular body 32 has shoulder means 38 and core member 34 has corresponding shoulder means 40 whereby body 32 and member 34 snap into engagement with one another. The longitudinal displacement of body 32 and member 34 versus one another is limited at the other end by means of matching ridge 40 and groove 42 in body 32 and member 34, respectively. Member 34 snugly fits into the lumen of body 32 and is rotatable about the longitudinal axis with respect thereto. Tubular body 32 has two openings, one 44 fitted with a luer type connector 46 and another 48 which has a much wider diameter than opening 44. Core member 34 has a radial opening 50. The lumen 36 of core member 34 is open at its one end 52 and closed at its other end where core member 34 is fitted with an integral handle 54. The entire stopcock 30 is suitably made of a plastic material such as polyethylene or polypropylene. In use, end 52 is connected to a body duct (not shown) which has an adapter which fits around shoulders 56. A luer connector 46 is in turn connected to a gas duct. In the position as shown in Fig. 7, opening 44 is in register with bore 50 whereupon gas can flow from the gas duct into lumen 36 and from there through the body duct into the body cavity. This state of the device, the insufflation state, is also shown in Fig. 8a. Following insufflation, the handle is rotated by 90° to the "OFF" position shown in Fig. 8b, in which it is retained during the performance of the laparoscopic surgery. Following the performance of the surgery, the handle may be rotated by another 90° to the position shown in Fig. 8c, whereupon bore 50 comes to be in register with opening 48 whereupon gas egressing from the body cavity can then be discharged through this opening. Fig. 9 illustrates another embodiment of a stopcock 30' according to the present invention, differing from the embodiment of Fig. 7 only in that it comprises a luer "locknut" type connect 60 for connecting a suitable line (not shown) to a discharge opening 22' and a luer "slip" connector 62 for connecting a line (not shown) to the opening 52' of lumen 15' of the stopcock. Fitting the stopcock with connectors at all its inlet and outlet openings permits its use in a plurality of applications as known per se . It should be obvious to a person skilled in the art that connections other than those shown in the drawings and specifically described herein may be used for various applications.

Claims: A stopcock for a medical infusion system, comprising: a tubular outer body (12) having at least two radial openings (20, 22) being on the same transverse cross-sectional plane of said body; and a hollow core member (14) snugly fitting into said outer body and having a first open end (16) and a second closed end, said member being connected to or integral with a handle (18) at said second end; said member (14) having at least one radial bore (24) and being rotatable within said body between a first state in which said radial bore (24) is in register with a first of said at least two openings (20, 22) and a second state in which said radial bore (24) is in register with a second of said at least two openings; the second opening (22) having a larger diameter than the first opening (20), characterised in that the radial bore (24) in said hollow core member (14) has a diameter essentially the same or larger than that of said second opening (22). A stopcock according to claim 1, wherein said first opening (20) is fitted with a radially extending luer connector and the second opening (22) is a discharge opening for the discharge of fluids in said second state. A stopcock according to claims 1 or 2, wherein a lumen of said core member (14) has a diameter which is the same or larger than said second opening (22). A stopcock according to any one of claims 1 to 3, wherein the core member (14) comprises two radial bores (24, 26) being on the same transverse cross-sectional plane, one having a diameter the same or more than that of said first opening (20) and the other having a diameter the same or more than that of said second opening (22). A stopcock according to claim 1, wherein each of said at least two radial openings (20, 22) and said core member (14) are fitted with a luer connector.

Inventors: ZINGER FREDDI, ZINGER, FREDDI
Applicants: UNITED STATES SURGICAL CORP, UNITED STATES SURGICAL CORPORATION
Application year: 1995
Main classification: A61M39
IPC codes: F16K11, A61B17, A61M39