MEDICAL DEVICE, FUNCTIONAL PART FOR A MEDICAL DEVICE AND METHOD FOR STERILIZING AND/OR PRODUCING STERILIZATION RESISTANCE OF A MEDICAL DEVICE OR FUNCTIONAL PART

Abstract

A medical device, an elastically deformable functional part for a medical device, and a method for sterilizing and/or for establishing sterilization resistance of a medical device or an elastically deformable functional part. The elastically deformable functional part has an openable slit arrangement that widens or opens upon elastic deformation of the elastically deformable functional part and recloses upon cessation of the elastic deformation. The slit wall faces of the slit arrangement are coated with a composition that includes a silicone oil and a thickener.

Claims

1. A medical device comprising an elastically deformable functional part having a slit arrangement that is openable, wherein the slit arrangement widens or opens upon an elastic deformation of the elastically deformable functional part and recloses upon cessation of the elastic deformation, wherein slit wall faces of the slit arrangement are coated with a composition, wherein the composition comprises a silicone oil and a thickener.

2. The medical device according to claim 1, wherein the silicone oil is a fluorinated silicone oil.

3. The medical device according to claim 1, wherein the silicone oil has a proportion of 0.1% by weight to 99.9% by weight based on the total weight of the composition.

4. The medical device according to claim 1, wherein the thickener is selected from the group consisting of: aluminium soap, aluminium complex soap, barium soap, barium complex soap, calcium soap, calcium complex soap, lithium soap, lithium complex soap, sodium soap, sodium complex soap, polytetrafluoroethylene (PTFE), inorganic thickener, in particular bentonite, polyurea, silica, glucose, ascorbic acid, starch and mixtures of at least two of the aforementioned thickeners.

5. The medical device according to claim 1, wherein the thickener is polytetrafluoroethylene (PTFE), silica or a mixture of polytetrafluoroethylene (PTFE) and silica.

6. The medical device according to claim 1, wherein the thickener has a proportion of 0.1% by weight to 99.9% by weight based on the total weight of the composition.

7. The medical device according to claim 1, wherein the composition further comprises a solid which is not a thickener.

8. The medical device according to claim 7, wherein the solid is selected from the group consisting of salts, saccharides, vitamins and mixtures of at least two of the aforementioned solids.

9. The medical device according to claim 7, wherein the solid has a proportion of 0.01% by weight to 99.99% by weight based on the total weight of the composition.

10. The medical device according to claim 1, wherein the composition is a viscous or pasty composition.

11. The medical device according to claim 1, wherein the elastically deformable functional part is at least sectionally transparent or light-transmissive.

12. The medical device according to claim 1, wherein the elastically deformable functional part is made of an elastically deformable material.

13. The medical device according to claim 12, wherein the elastically deformable material is an elastomer.

14. The medical device according to claim 1, wherein the slit arrangement is formed as a longitudinal slit arrangement.

15. The medical device according to claim 1, wherein the elastically deformable functional part is formed as a valve body.

16. The medical device according to claim 1, wherein the elastically deformable functional part has a head region, wherein the slit arrangement is formed along a transverse extent of the head region and extends centrally along a central longitudinal axis through the head region.

17. The medical device according to claim 1, wherein the medical device is a medical device for infusion therapy.

18. A method for sterilizing and/or for establishing sterilization resistance of the medical device according to claim 1, wherein the method comprises the steps of: a) coating or loading the slit wall faces of the slit arrangement with the composition; and b) sterilizing the medical device or the elastically deformable functional part.

19. An elastically deformable functional part for a medical device, the elastically deformable functional part comprising a slit arrangement that is openable, wherein the slit arrangement widens or opens upon an elastic deformation of the elastically deformable functional part and recloses upon cessation of the elastic deformation, wherein slit wall faces of the slit arrangement are coated with a composition, wherein the composition comprises a silicone oil and a thickener.

20. A method for sterilizing and/or for establishing sterilization resistance of the elastically deformable functional part according to claim 19, wherein the method comprises the steps of: a) coating or loading the slit wall faces of the slit arrangement with the composition; and b) sterilizing the medical device or the elastically deformable functional part.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0074] FIG. 1 shows a plan view of one embodiment of a medical device according to the present disclosure in the form of a connection device;

[0075] FIG. 2 shows a section through the medical device according to FIG. 1 along the section line II-II in FIG. 1;

[0076] FIG. 3 shows a view from below of a functional part of the medical device according to FIG. 2 in the form of a valve body;

[0077] FIG. 4 shows a longitudinal section through the valve body according to FIG. 3 along the section line IV-IV in FIG. 3;

[0078] FIG. 5 shows a further longitudinal section through the valve bodies along the section line V-V in FIG. 3;

[0079] FIG. 6 shows a plan view of the valve body according to FIGS. 3 to 5;

[0080] FIGS. 7 to 9 show sectional views of different steps during connection of a component to the medical device according to FIG. 2; and

[0081] FIGS. 10a and 10b show one embodiment of a method according to the present disclosure.

DETAILED DESCRIPTION

[0082] FIG. 1 shows schematically one embodiment of a medical device according to the present disclosure in the form of a connection device 1 of a medical infusion system. The connection device 1 may, for example, be in the form of a three-way valve, as shown in FIG. 1. It will be appreciated, however, that the connection device 1 may deviate from this, in particular may be in the form of a one-way or two-way valve or in the form of a valve manifold, i.e. in the form of a unit or system having or composed of one-way valves connected in series, i.e. one after the other.

[0083] The connection device 1 comprises a housing 2, a connection nozzle 3 and two connection regions 4, 5. Rotatably mounted in the housing 2 is an actuator 6. Further provided in the housing 2 are a total of three connection channels which are blocked or connected to each other depending on the position of the actuator 6. One connection channel of the housing 2 leads to the connection nozzle 3. A further connection channel arranged at a right angle leads to the connection region 4 and, opposite to this, a third connection channel leads to the connection region 5. One of the two connection regions 4, 5 is intended for the connection of a patient line. The other connection region 4, 5 is used to connect a connection line to a fluid container. The connection nozzle 3 is preferably provided for temporary connection of a component of the medical infusion system, such as in particular a syringe, in order to supply the patient line with, for example, (additional) medicaments or the like. Additionally or alternatively, the connection nozzle 3 may be provided for connection, in particular continuous connection (permanent connection), of an additional line.

[0084] The connection nozzle 3 will be more particularly elucidated with reference to FIGS. 3 to 5 that follow.

[0085] The connection nozzle 3 may have a dimensionally stable cap 8 which, at its end face that faces the housing 2, is connected, preferably fixedly connected, to a dimensionally stable base section 7 of the housing 2. The cap 8 is sleeve-shaped and has, on the side facing the base section 7, a thickened edge region which is fixedly connected to the base section 7, for example by welding. The base section 7 is dish-shaped and protrudes radially outwards relative to a central longitudinal axis L of the connection nozzle 3. The base section 7 surrounds a channel section which conically tapers or non-conically tapers towards an interior of the housing 2. Alternatively, the channel section may be cylindrical or non-cylindrical.

[0086] At its end region that is remote from the base section 7, the cap 8 is provided with a passage 10 which is closable by a valve body 11 of the connection device 1 that will be described in greater detail below. The passage 10 is enclosed by a thickened edge region which is provided with connection profiling 9 in the form of Luer-lock profiling.

[0087] The valve body 11 is preferably cup-shaped or bell-shaped and in particular made of an elastically deformable material as a single piece. The elastically deformable material is preferably an elastomer or thermoplastic elastomer. Particularly preferably, the elastically deformable material is a silicone elastomer, such as silicone rubber. Preferably, the elastically deformable material is moreover transparent, i.e. light-transmissive.

[0088] The valve body 11 preferably has an outer contour which, in an unloaded, i.e. non-deformed, initial state, is in flush and planar contact with the inner contour of the cap 8 over a total height of the cap 8. The valve body 11 has a head region 12, in particular a head region in lid form. The head region 12 may have a rotationally symmetrical, in particular circular, or, as depicted, a rotationally unsymmetrical, in particular oval, main face (see in particular FIGS. 3 and 6). The valve body 11 further comprises a valve casing 15. The valve casing 15 adjoins the head region 12, preferably directly. Preferably, the valve casing 15 is provided with a base ring 16 at a lower end-face region. The head region 12 is provided with a slit arrangement 14. A surface 13 of the head region 12 is preferably smooth and flat.

[0089] From FIG. 7, it can be seen that, in an unloaded initial state of the valve body 11, the surface 13 of the head region 12 can be flush in the cap 8 with a marginal edge of the passage From said marginal edge of the passage 10, an oblique chamfer extends outwards up to an end face of the edge region of the cap 8 that defines the passage 10. Consequently, in the unloaded initial state of the valve body 11, the end face of the edge region of the cap 8 including the surface 13 of the head region 12 of the valve body 11 can be cleaned and disinfected in a simple manner, for example by means of a disinfectant cloth or the like, by medical personnel.

[0090] The valve casing 15 of the valve body 11 is preferably rotationally symmetrical relative to the central longitudinal axis L. Preferably, the valve casing 15 has a wall which thickens starting from the head region 12 up to the base ring 16. Said thickening may occur discontinuously and non-linearly, as can be seen from the two visible edges shown. The edges are preferably annularly circumferential. The valve casing 15 may have a first wall section of constant thickness that adjoins the head region 12 and expands like a truncated cone. Adjoining said first wall section, in the direction of the base ring 16, may be a second wall section, the inner wall of which runs cylindrically and coaxially in relation to the central longitudinal axis L and the outer wall of which runs bulgingly further outwards towards the base ring 16. Adjoining said wall section, in particular central wall section, may be a base-side wall section. Preferably, the base-side wall section comprises the base ring 16. Preferably, in this region, the inner wall tapers towards the base section starting from the cylindrical central region, thereby yielding an inner wall section which conically tapers downwards.

[0091] The inner wall may conically expand again towards the end face of the base ring 16 to form a contact surface 18. Consequently, an egg-shaped or O-shaped inner contour 17 can result over the height of the valve casing 15 (see FIGS. 4 and 5).

[0092] An inner face of the head region 12 pointing into the interior of the valve casing 15 may be a dome-shaped contour 19, as shown in FIG. 5.

[0093] The passage 10 of the cap 8 may be rotationally symmetrical or rotationally unsymmetrical. In the case of a rotationally unsymmetrical head region 12, the passage 10 is preferably also rotationally unsymmetrical in a complementary manner.

[0094] As can be seen from FIGS. 2 and 7 to 9, the conical contact surface 18 of the base ring 16 of the valve body 11 is assigned a complementarily conical support face 20 in the region of the base section 7, as a result of which the valve body 11 is planarly supported on the base section 7 in the region of the base ring 16 over its entire radial width.

[0095] The slit arrangement 14 is oriented transversely to a longitudinal extent of the head region 12, as can be seen from FIGS. 4 to 6. The slit arrangement 14 preferably extends centrally along the central longitudinal axis L through the head region 12. The slit arrangement 14 has two slit wall faces 21, 22 which close, preferably tightly, the slit arrangement 14 in an unloaded initial state of the valve body 11.

[0096] The slit wall faces 21, 22 of the slit arrangement 14 are provided with a composition 23. The slit wall faces 21, 22 may be provided, in particular coated, with the composition 23 only partially or completely, i.e. across the entire surface.

[0097] Preferably, the composition 23 is present only on the slit wall faces 21, 22 of the slit arrangement 14. In other words, especially the head region 12 remaining and the valve casing are preferably composition-free, i.e. free of the composition.

[0098] The composition 23 can advantageously prevent radiation-induced crosslinking of the elastically deformable material of the valve body 11, for example during gamma sterilization, beta sterilization, X-ray sterilization or electron beam sterilization (E-beam sterilization) of the connection device 1. This can significantly reduce or even completely avoid the risk of closing up of the slit arrangement 14.

[0099] The composition 23 comprises an oil and a thickener, preferably a biocompatible oil and a biocompatible thickener, or consists of an oil and a thickener, preferably a biocompatible oil and a biocompatible thickener. The oil is preferably a silicone oil, in particular a partially fluorinated or perfluorinated silicone oil. Alternatively, the oil may also be a fluorine-free silicone oil. The thickener is preferably polytetrafluoroethylene (PTFE) and/or silica. Preferably, the composition is in the form of a viscous or pasty composition. Particularly preferably, the composition is a lubricating grease composition.

[0100] The aforementioned composition has been found to be particularly suitable with respect to avoiding closing up or healing of the slit arrangement 14 during radiation sterilization, such as in particular gamma radiation sterilization. In particular, a further advantage of these substances is that they do not affect any transparency of the valve body 11. In addition, the aforementioned substances can advantageously contribute to an increase in the ageing resistance of the valve body 11.

[0101] Once a tip of a component K to be connected to the connection nozzle 3 is brought from the outside to the connection nozzle 3, the tip comes into planar contact with the outer surface of the head region 12 and pushes the head region 12 into the interior of the cap 8. In this case, the slit arrangement 14 widens, and elastically deformed sections of the head region 12 are placed against the outside of the tip of the component K on further penetration of said tip. When the tip is disconnected and consequently removed outwardly, the head region 12 returns to the initial position according to FIG. 7.

[0102] FIGS. 10a and b show schematically one embodiment of a method according to the present disclosure.

[0103] The method first comprises coating the slit wall faces 21, 22 of the slit arrangement 14 with the composition. To this end, a valve body 11 is placed in a receptacle or directly on a nozzle 24. At the same time, the nozzle 24 can be brought closer using a hold-down device and/or a compression overlay until the valve body 11 is compressed. Furthermore, the valve body 11, as shown in FIGS. 10a and b, can be pressed against a Luer-like or cylindrical component 25, bringing about an at least partial opening of the valve body 11. In this case, the component 25, as shown in FIG. 10b, can enter somewhat.

[0104] Preferably, the nozzle 24 has a diameter of 0.1 mm to 10 mm, preferably 0.9 mm to 2 mm. The aforementioned nozzle diameters are particularly well suited for coating the slit wall faces 21, 22 of the slit arrangement 14 with the composition and for preventing closing up of the slits by the composition according to the present disclosure. Furthermore, the aforementioned nozzle diameters can advantageously prevent segregation of the composition, i.e. separation of the composition into oil and thickener.

[0105] Furthermore, the nozzle 24 may be elliptic or in the form of a slotted nozzle. If necessary, an orientation in relation to the slit wall faces 21, 22 of the slit arrangement 14 may be expedient.

[0106] Alternatively or in combination, the slit wall faces 21, 22 of the slit arrangement 14 may be subjected to spreading or smearing of the composition with the aid of a spreading element, in particular a doctor blade.

[0107] Alternatively or in combination, the composition may be applied by an air stream or mist, in particular a damp or dry mist. Preferably, the air stream or mist is conducted through the partially or fully open valve body 11 in such a way that the air stream or mist floods the slit wall faces 21, 22 of the slit arrangement 14 with the composition. The composition is transported by the air stream or mist in the direction of the arrow (see FIG. 10b). The air or mist pressure for transporting the composition to the slit wall faces 21, 22 of the slit arrangement 14 may be selected from 0.1 bar to 7 bar, preferably 0.5 bar to 3 bar. Furthermore, a volume flow time of 1 ms to 5 s, in particular 50 ms to 1 s, may be selected.

[0108] Preferably, the valve body 11 is compressed and thus opened in such a way that the inner lumen of the valve body 11 is not coated.