Safety cap for medical devices

Abstract

A cap for medical fluid lines and the like includes a hollow body within which a male or female connector accessible at one end of the body is coaxially housed. The connector is configured to inviolably obstruct the passage through the body. A unidirectional coupling locks in rotation the connector with respect to the body in the direction corresponding to the screwing of the connector, and a complementary connector, and to enable free rotation of the connector in the opposite direction. The connector can be possibly locked in rotation with respect to the body in the unscrewing direction, only following a positive command.

Claims

1. A cap for medical fluid lines, comprising: a hollow body within which a connector accessible at one end of the body is coaxially housed; unidirectional coupling means to lock the connector in rotation with respect to the body in a direction corresponding to a screwing of said connector and a complementary connector to be coupled therewith, and to enable free rotation of said connector in the opposite direction; and said connector having a wall closing a free end thereof to inviolably obstruct a passage through said body permanently to avoid fluid communication with an interior of said hollow body when said connector is coupled to said complementary connector.

2. A cap according to claim 1, further comprising locking means designed to be positively operated to lock said connector in rotation with respect to the body in said opposite direction.

3. A cap according to claim 1, wherein said unidirectional coupling means comprise ratchet teeth.

4. A cap according to claim 2, wherein said locking means comprise elastically yielding segments of the body, suitable for engaging corresponding peripheral teeth of said connector.

5. A cap according to claim 1, wherein the connector is a male luer lock connector, having an internally threaded outer hollow element and an inner hollow element having a transverse partition for closing the flow through the cap.

6. A cap according to claim 1, wherein the connector is a female luer lock connector having an externally threaded hollow element and a transverse partition for closing the flow through the cap.

7. A cap according to claim 1, wherein the connector is integrally formed with a sleeve, axially locked within said body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will now be described in detail with reference to the accompanying drawings, provided purely by way of non-limiting example, in which:

(2) FIG. 1 is a schematic elevational side view of a safety cap according to a first embodiment of the invention,

(3) FIG. 2 is an axial section view according to the line C-C of FIG. 1,

(4) FIG. 3 is a cross sectional view according to the line B-B of FIG. 1,

(5) FIG. 4 is a cross sectional view according to the line A-A of FIG. 1,

(6) FIG. 5 is a cross sectional view according to the line D-D of FIG. 2,

(7) FIG. 6 is a cross sectional view according to the line E-E of FIG. 2,

(8) FIG. 7 is an elevational side view of a second embodiment of the cap according to the invention,

(9) FIG. 8 is an axial section view according to the line C-C of FIG. 7,

(10) FIG. 9 is a cross sectional view along line B-B of FIG. 7,

(11) FIG. 10 is a cross sectional view along line A-A of FIG. 7,

(12) FIG. 11 is a cross sectional view along line D-D of FIG. 8,

(13) FIG. 12 is a cross sectional view along line E-E of FIG. 8,

(14) FIG. 13 is an elevational side view of a third embodiment of the cap according to the invention,

(15) FIG. 14 is an axial section view according to the line C-C of FIG. 13,

(16) FIG. 15 is a cross sectional view along line B-B of FIG. 14,

(17) FIG. 16 is a cross sectional view along line A-A of FIG. 13,

(18) FIG. 17 is a cross sectional view along line D-D of FIG. 14,

(19) FIG. 18 is a cross sectional view along line E-E of FIG. 14,

(20) FIG. 19 is an elevational side view of a fourth embodiment of the cap according to the invention,

(21) FIG. 20 is an axial section view according to the line C-C of FIG. 19,

(22) FIG. 21 is a cross sectional view along line B-B of FIG. 19,

(23) FIG. 22 is a cross sectional view along line A-A of FIG. 19,

(24) FIG. 23 is a cross sectional view along line D-D of FIG. 20, and

(25) FIG. 24 is a cross sectional view along line E-E of FIG. 20.

DETAILED DESCRIPTION OF THE INVENTION

(26) Referring initially to FIGS. 1 to 6, the safety cap according to a first embodiment of the invention is indicated with I and comprises an outer hollow body 1 of a generally cylindrical shape, within which a male connector 2 of the luer lock type and analogues is coaxially housed.

(27) The male connector 2 is rotatably mounted relative to the body 1, with the limitations which will be discussed, and has a partly conventional structure. In detail, the male connector 2 comprises an inner tubular element 4 with a conical outer surface protruding from one end of the body 1, and an internally threaded outer hollow element 5, which extends towards the inside of the body 1 with a integral hollow sleeve-shaped appendage 6, locked axially within the body 1, which is conveniently formed from two half-shells joined together in an interlocking manner.

(28) During use, the male connector 2 is intended to be coupled to a complementary female connector of the luer lock type or the like and, according to a first aspect of the invention, the inner tubular element 4 is closed at its free end by a transverse wall 7. Consequently, the flow passage through the cap I is permanently obstructed in an inviolable manner.

(29) According to another aspect of the invention, the composite formed by the male connector 2 and the sleeve 6 is coupled in rotation in one direction with the body 1, and is freely rotatable in the opposite direction. However, as will become evident, the rotation in the opposite direction may also possibly be locked, but only following a positive command imparted manually.

(30) In detail, and referring now to FIG. 6, the hollow body 1 is internally formed, on the side of the male connector 2, of a crown of elastically yielding ratchet teeth 12, cooperating by unidirectional coupling with corresponding projecting teeth 13 formed on the outside of the hollow element 5 of the male connector 2. The arrangement is such so that the hollow element 5, and therefore the entire male connector 2, is coupled in rotation with the hollow body 1 in the direction indicated by the arrow F in FIG. 6, due to the effect of the engagement between the teeth 12 and 13. The direction of rotation F corresponds to the screwing of the male connector 2 and a complementary female connector, assuming the hollow body 1 is kept stationary, and then the complementary female connector is rotated to screw it into the male connector 2. In the opposite direction of rotation, or rather, the unscrewing direction, the male connector 2 is freely rotatable with respect to the hollow body 1, due to the bounce of the yielding teeth 12 on the teeth 13, so that the complementary female connector cannot unscrew itself.

(31) Obviously, in the case in which the hollow body 1 rotates and the complementary female connector is kept stationary, the situation is reversed, i.e. the direction of screwing is opposite to that of the arrow F, and the unscrewing direction is that of the arrow F.

(32) In this way, during use, an accidental disengagement or due to incorrect operation, between the male connector 2 and the complementary female connector is prevented.

(33) The variant of the safety cap represented in FIGS. 7 to 12, indicated by II, is analogous to the embodiment shown previously, and only the differences will now be described in detail, using the same numerical references for identical or similar parts.

(34) This variant is configured to allow rotation of the male connector 2 corresponding to the unscrewing direction with respect to the complementary female connector but, as mentioned, only following a positive, or rather, voluntary operation. To this effect, the wall of the hollow body 1 is formed with a pair of elastically yielding locking segments 14, whose free ends 15 are suitable for engaging, as a result of a thrust applied to the segments 14, respective peripheral teeth formations 16 of the hollow appendage 6 (FIG. 10), so as to lock the rotation of the male connector 2 with respect to the body 1.

(35) The variants of the cap according to the invention illustrated in FIGS. 13-18 and in FIGS. 19-24, and indicated with III and IV, respectively, correspond to the embodiments previously described with reference to FIGS. 1-6 and 7-12, respectively, with the only difference that the connector consists of a female connector 3, also of the luer-lock type and the like, instead of the male connector 2.

(36) The female connector 3 is formed, in the usual manner, by an externally threaded tubular element with a conical inner surface, protruding from one end of the body 1 and, during use, is intended to be coupled to a complementary male connector of the luer-lock type or the like.

(37) The female connector 3 is internally closed by a transverse wall 7, so that the flow passage through the cap III is, in this case as well, permanently obstructed in an inviolable manner. Moreover, the female connector 3 is integrally formed with a sleeve 9, analogous to the sleeve 6 of the preceding embodiments, locked axially in the body 1.

(38) In a completely analogous manner to the embodiment already described, the composite formed by the female connector 2 and the sleeve 9 is coupled in rotation in one direction with the body 1 and is freely rotatable in the opposite direction. However, as will become evident, the rotation in the opposite direction may also possibly be locked, but only following a positive command imparted manually.

(39) In detail, and with reference to FIG. 17, the female connector 3 is coupled in rotation with the hollow body 1 in the direction indicated by the arrow F, corresponding to the screwing of this female connector 3 with a complementary male connector, rotating the hollow body 1, while it is normally freely rotatable in the opposite direction, or rather, in the unscrewing direction. To this effect, the hollow body 1, as for the embodiments previously described, is formed with a series of elastically yielding ratchet teeth 12, cooperating by unidirectional coupling with corresponding projecting teeth 13 formed outside the female connector 3.

(40) The variant illustrated in FIGS. 19 to 24 is configured, in a manner corresponding to the embodiment of FIGS. 7 to 12, for possibly locking in rotation the female connector 3, with respect to the hollow body 1, in the direction opposite to that indicated by the arrow F, in this case as well, by a positive command imparted manually. To this effect, the hollow body 1 of the cap IV is therefore formed with one or two pairs of elastically yielding locking segments 19, analogous to the yielding locking sectors 14, the free ends 20 of which are suitable for engaging respective peripheral teeth formations 21 of the sleeve 9 (FIGS. 21 and 22).

(41) Of course, the details of construction and the embodiments may be widely varied with respect to those described and illustrated, without departing from the scope of the present invention as defined in the following claims.