US20030078195A1 - Cartridge and medical delivery system accommodating such cartridge - Google Patents

Abstract

A cartridge having a distal end provided with a mechanical coding. The coding has the form of a circular protrusion where the circular outer diameter is dedicated a specific concentration of insulin contained in the cartridge. The distal end of the cartridge is fitted in to a circular contour in the housing. The outer diameter of the protrusion on the distal end of the cartridge is chosen as a larger diameter for a higher concentration of insulin. In this way only a cartridge containing the correct concentration or a lower concentration fits into a delivery system designed for a specific concentration of insulin.

Description

CROSS REFERENCE OF RELATED APPLICATION
• This application claims the benefit of priority under 35 U.S.C. §119 of U.S. Provisional Application No. 60/317,307, filed on Sep. 5, 2001 and Danish Application PA 2001 01268, filed on Aug. 27, 2001; the contents of both are hereby fully incorporated by reference.[0001]
BACKGROUND OF THE INVENTION
• 1. The Technical Field of the Invention[0002]
• The invention relates to ampoules or cartridges for medical delivery systems. Such cartridges are commonly shaped as a glass or plastic tube being at one end closed by a piston, which may be pressed into the tube to expel the content of the tube at the other end of the tube. This other end is often formed as a bottleneck, the outer end of which may be pierced by a conduit such as an injection needle or a catheter through which the content is expelled. The invention furthermore relates to a medical delivery system accommodating such a cartridge.[0003]
• 2. Description of Related Art[0004]
• Cartridges are widely known for various medical delivery systems. They are especially used for insulin delivery systems, and are usually supplied pre-filled with either 1.5 ml of insulin or 3.0 ml of insulin.[0005]
• The typical diabetes patient will require a certain amount of insulin either injected or infused into their body every day. The patient loads a cartridge containing the insulin into either an injection system or a pump system and injects or infuses the insulin into their body at a prescribed rate, either through an injection needle or through a catheter having one end inserted into their body. The injection needle or the catheter is at the other end connected to the cartridge. Once the cartridge is empty it is disposed of and a new cartridge is loaded into the delivery system.[0006]
• Glass is the most preferred material for cartridges containing insulin, however cartridges moulded from plastic such as shown in WO 98.56438 is on the verge of a break through.[0007]
• A prior art glass cartridge is disclosed in EP 0 549 694. This glass cartridge has an adapter mounted on the distal end of the glass cartridge. The adapter has a bore for receiving the neck part of the glass cartridge, which neck part is closed of by a metal cover. The inner wall of the bore is provided with gripping elements for gripping behind the edge of the metal cover when the neck part is mounted in the bore.[0008]
SUMMARY OF THE INVENTION
• Traditionally, cartridges containing fluid medication have been used with medical delivery systems worldwide for invasive delivery of various types of fluid medicines. However, in typical medical delivery systems a cartridge is simply inserted into the delivery system without the system having any method of determining if the medicament contained in the cartridge is the correct type of medication for that specific delivery system. The user must manually check the cartridge to make sure that the medication is the correct one. This is quit important, since the administration of a incorrect kind of medication or of an incorrect dosage could result in injury or death.[0009]
• In order to overcome the drawbacks of the prior art it is here suggested to provide the cartridge with a mechanical coding that has to fit into a specific contour in the medical delivery system in order to allow correct mounting of the cartridge in the medical delivery system.[0010]
• By providing the cartridge with a mechanical coding it is ensured that the specific cartridge will only fit into a medical delivery system having a cartridge receiving part with a contour conforming to the shape of the mechanical coding of the cartridge.[0011]
• In some medical delivery systems however, the conduit delivering the medication into the body of the patient are connected directly to the cartridge. The connecting part of the conduit, which are usually referred to as the conduit connector can then be made with an interior contour, which fits over the specific contour of the mechanical coding of the cartridge.[0012]
• The shape of the contour of the cartridge and the corresponding part of the medical delivery system or the conduit connector can be any geometrical shape wanted, e.g. triangular, square or any other polygon.[0013]
• In this way the manufacture of the medicament can ensure that a specific medicament contained in a cartridge having a mechanical coding only can be dispensed from a specific medical delivery system and/or through a specific conduit.[0014]
• The mechanical coding can either be moulded as an integral part of the cartridge, or it can be added to the cartridge in the form of e.g. an adapter, a sleeve or a jacket connected to the cartridge. The mechanical coding could also be provided as a part of the cartridge sealing.[0015]
• The mechanical coding could also be provided as one or more depressions provided either in the cartridge or in the adapter. The medical delivery system would then be provided with a stud, which has to fit into the depression or depressions in order to allow the cartridge to be connected to the medical delivery system.[0016]
• When the mechanical coding is made as one or more protrusions extending radial outwards from the outer cartridge surface, which is cylindrical, the cartridge can perform like a key while the cartridge receiving part of the medical delivery system or the conduit connector receiving the cartridge can perform as a key hole.[0017]
• Instead of providing the outer cartridge surface with the mechanical coding, an adapter carrying the mechanical coding can be mounted on the cartridge at its distal end. This solution is to be preferred for glass cartridges.[0018]
• When the mechanical coding is made as one or more protrusions extending radial outwards from the outer adapter surface, which is cylindrical, the outer adapter mounted on the cartridge can perform like a key while the cartridge receiving part of the medical delivery system or the conduit connector receiving the cartridge can perform as a key hole.[0019]
• By letting the protrusion or protrusions located on the outer surface of the cartridge or the adapter form a substantial circular protrusion, the outer surface of either the cartridge or the adapter can be made rotational symmetrical.[0020]
• The protrusions can be formed as one circular protrusion covering substantially 360 degrees of the outer surface, or as a number of individual protrusions preferably located along a circle on the outer periphery of the outer surface of the cartridge or the adapter, such that the outer surface is rotational symmetrical, hence the location of the cartridge or the adapter in relation to the cartridge receiving part of the medical delivery system or the conduit connector receiving the cartridge is of importance.[0021]
• The mating key hole of the cartridge receiving part of the medical delivery system or the conduit connector needs in its simplest form just be a hole having an inside contour conforming to the outside diameter of the circular protrusion.[0022]
• Cartridges can then be made to fit specific delivery systems simply by mating the outside diameter of the circular protrusion with the inside contour of the cartridge receiving part of the medical delivery system or with the inside contour of the conduit connector.[0023]
• The circular protrusion can either be made as one or a few protrusions substantially covering 360 degrees of the outer cartridge surface or the outer adapter surface, or it can be made as a number of raised islands located along the outer cartridge surface or the outer adapter surface. The number of raised island can vary from one and up.[0024]
• The diameter of the circular protrusion can be utilized to indicate a parameter of the medicament contained in the specific cartridge. The parameter could e.g. be the type of medicament or it could be the concentration of the medicament.[0025]
• When the cartridge contains insulin for treating diabetes it is to be preferred that the specific diameter of the circular protrusion is dedicated a specific concentration of insulin. Most insulin sold today has a concentration of 100 International Units (IU) pr. millilitre of insulin. Recently insulin with a concentration of 200 IU pr. ml. has emerged.[0026]
• If a patient by accident loads a cartridge containing insulin with a concentration of 200 IU pr. ml. into a medical delivery system which are designed for use with insulin having a concentration of 100 IU pr. ml the patient will inject twice the number of International Units needed while the medical delivery systems normally are designed to expel a given quantity of insulin. The consequences of this could be fatal.[0027]
• It is therefore of the outmost importance that cartridges containing insulin with a concentration of 200 IU pr. ml are effectively prevented from being used in medical delivery systems designed to handle insulin with 100 IU pr. ml.[0028]
• This is done by providing cartridges containing insulin with a concentration of 200 IU pr. ml. with a circular protrusion with a larger diameter than a cartridge containing insulin with only 100 IU pr. ml. When at the same time the inside contour of the cartridge receiving part of the medical delivery system or the conduit connector for a 100 IU pr. ml system is made to fit the diameter of the circular protrusion of the adapter of a cartridge containing insulin with a 100 IU pr. ml, it is ensured that a cartridge containing insulin with a concentration of 200 IU pr. ml can not be used in such a delivery system while the diameter of the circular protrusion of this cartridge is to large to fit into the inside contour of the cartridge receiving part of the medical delivery system or the conduit connector of a 100 IU pr. ml system.[0029]
• This system can be expanded to also encompass insulin with even higher concentrations, such as 300 or 400 IU pr. ml simply by moulding the circular protrusions carried on the cartridges of these higher concentrations with larger diameters, such that the circular protrusion of a cartridge containing insulin with a specific concentration do not fit into-the cartridge receiving part of a medical delivery system and/or into a conduit connector for a medical delivery system designed for a lower concentration of insulin.[0030]
• When using cartridges with circular protrusions with larger diameters for higher concentrations of insulin it will however be possible for a patient to fit a cartridge containing insulin with a lower concentration into the cartridge receiving part of a medical delivery system and/or into a conduit connector of system designed for a higher concentration of insulin. The result of this is that the patient does not get insulin enough for the correct treatment, which is a major inconvenience for that individual patient, but which is not a fatal incident, and which the patient will discover next time the blood glucose level is measured.[0031]
• It is furthermore an object of the present invention to provide a medical delivery system accommodating a cartridge carrying a mechanical coding.[0032]
• Such a medical delivery system is described in[0033]claim 9, as having a housing for accommodating a cartridge containing a fluid medicament, which housing in at least a part of the housing has a contour with an inside shape conforming to the outside shape of the mechanical coding, such that only cartridges containing a fluid medicament suitable for the specific medical delivery system can be received in the specific medical system.
• In some medical delivery systems, the conduit delivering the fluent medicament is connected directly to the cartridge by use of a conduit connector located at one end of the conduit. This conduit connector will then have a contour conforming to the mechanical coding on the outer cartridge surface or the adapter surface, such that only cartridges containing a fluid medicament suitable for the specific medical delivery system can be connected to the conduit of that specific medical delivery system.[0034]
• The medicament contained in the cartridge is preferably insulin, the mechanical coding is a circular protrusion and the specific outside diameter of the circular protrusion is dedicated a specific concentration of insulin and the outside diameter is chosen as a larger diameter for a higher concentration.[0035]
• In this way it is ensured that only insulin with concentrations suitable for or lower than the insulin concentration a specific insulin delivery system or conduit is designed for can actually be used in that specific insulin delivery system or with that specific conduit.[0036]
• Definitions[0037]
• In the present context, the term “Medical delivery system” is taken to mean any system for invasive bringing a fluid medicament into a human body. The most commonly used medical delivery system is an injection system or an infusion system. In an injection system a predetermined quantity of the medicament are brought into the human body at one time through a conduit such as an injection needle temporarily inserted in the body. In an infusion system a quantity of the medicament is pumped via a pump system into the human body at a small constant rate through a conduit such as a catheter constantly inserted in the human body.[0038]
• Although the wording “human body” is used through out this application, the medical delivery system could as well be used on any other mammal body without dispersing from the scope of the claims.[0039]
• It is to be understood that the wording “protrusion”, refers to an element or a part that protrudes from a surface disregarding the form or the shape of the element or the part, while the term “circular protrusion” refers to a part which continuously protrudes from a circular surface substantially at all 360 degrees round the surface. The circular protrusion can however be made from a number of raised points located at a circle at the periphery of the surface without dispersing from the scope of the claims.[0040]
• In the present context, the term “Conduit connector” is taken to mean a part or an element which is connected to the conduit or moulded as an integral part of the conduit, and which can be connected directly to either the cartridge, to the adapter or to the medical delivery system.[0041]
BRIEF DESCRIPTION OF THE DRAWINGS
• The invention will be explained more fully below in connection with a preferred embodiment and with reference to the drawings in which:[0042]
• FIG. 1 Shows an adapter mounted on a cartridge.[0043]
• FIG. 2 Shows the adapter of FIG. 1 seen from above[0044]
• FIG. 3 Shows an adapter with two circular protrusions protruding from the outer adapter surface.[0045]
• FIG. 4 Shows an adapter with a number of raised islands protruding forming the outer adapter surface.[0046]
• FIG. 5 Shows an adapter where the protrusion has the same width as the extension of the outer adapter surface.[0047]
• FIG. 6 Shows an adapter, which can be horizontally mounted on the cartridge.[0048]
• The figures are schematic and simplified for clarity, and they just show details, which are essential to the understanding of the invention, while other details are left out. Throughout, the same reference numerals are used for identical or corresponding parts.[0049]
DETAILED DESCRIPTION OF THE INVENTION
• Initially it may be convenient to define that, the term “distal end” of the[0050]cartridge2 or theadapter1 is meant to refer to the end carrying the conduit through which the medicine is expelled, whereas the term “proximal end” is meant to refer to the opposite end.
• FIG. 1 shows the[0051]adapter1 mounted on acartridge2. Thecartridge2 is closed of by ametal cover3 which are folded over the bottleneck of thecartridge2 and beaded at the lower edge. Theadapter1 has adistal end surface4, aproximal end surface5 and anouter adapter surface6 there between. Theadapter1 further has a longitudinal bore conforming the outer diameter of themetal cover3. Theadapter1 is mounted on thecartridge2 simply by pushing theadapter1 over themetal cover3. This is possible since the inside bore of the adapter has a diameter larger than the outside diameter of themetal cover3. Theinside surface7 of this bore is provided with a number of gripping elements8, usually there are three such gripping elements8 located with a 120 degrees displacement. The diameter formed by these three gripping elements8 are smaller than the diameter of themetal cover3, such that the gripping elements8 will grip behind the beaded end of themetal cover3 when theadapter1 is mounted on thecartridge2.
• The[0052]outer adapter surface6 is provided with one ormore protrusions9, whichprotrusion9 extends radial outwards from the outer adapter surface. Theprotrusion9 can as shown in FIG. 2 have a circular form covering 360 degrees of theouter adapter surface6.
• The[0053]circular protrusion9 has an outer diameter, which can be different from oneadapter1 to anotheradapter1 as indicated withdotted lines10.
• The[0054]cartridge receiving part11 is provided with acircular bore13, which receives theadapter1 when thecartridge2 is mounted in thecartridge receiving part11. For other types ofcartridge receiving parts12 indicated with dotted lines, thebore14 could have a different diameter.
• Referring to FIGS. 1 and 6, a specific outside diameter of the[0055]circular protrusion9,10 is dedicated to a specific concentration of the insulin contained in thecartridge2. Thecartridge2 containing the lowest concentration is provided with anadapter1 having only a small outside diameter of thecircular protrusion9, while the larger concentrations are provided with anadapter1 having a larger diameter of thecircular protrusion10.
• The same is the case for the diameter of the bore of the[0056]cartridge receiving part11. Thecartridge receiving part11 on a medical delivery system designed for low concentrations has the smallest diameter of thebore13, while thecartridge receiving part12 on a medical delivery system for handling larger concentrations has alarger bore14.
• As illustrated in FIG. 6 a[0057]cartridge receiving part11 on a medical delivery system designed for 100 IU pr. ml can only receive theadapter1 of ancartridge2 containing insulin with a 100 IU pr. ml. concentration, which is indicated by the outside diameter of thecircular protrusion9, while thecartridge receiving part12 on a system designed for 200 IU pr. ml. can receive both theadapter1 of acartridge2 containing insulin with a concentration of 100 IU pr. ml and theadapter1 of acartridge2 containing insulin with a concentration of 200 IU pr. ml, indicated by acircular protrusion10 having a larger outside diameter.
• Although the 100[0058]IU cartridge2 of FIG. 6 is described as being acartridge2 with anadapter1 mounted thereto, it could as well be acartridge2 moulded from plastic with theprotrusion9 moulded as an integral part of thecartridge2.
• The[0059]cartridge receiving part15 of medical delivery system designed for 300 IU pr. ml is able of handle both the previous mentionedadapters1 havingcircular protrusions9,10 as well as an adapter of a cartridge having acircular protrusion16 with an even larger diameter containing insulin with a concentration of 300 IU pr. ml.
• FIGS.[0060]3 to5 show different configurations ofadapters1. Theadapter1 of FIG. 3 is provided with twoprotrusions9,17 both covering 360 degrees of theouter surface6.
• The[0061]first protrusion9 is shown as having a width W. Theadapter1 shown in FIG. 4 is provided with a number ofprotrusions18 which are shaped as a number of raised points, and which raised points are provided on a circle covering substantially 360 degrees of theouter surface6 of theadapter1.
• The circular protrusion or protrusions can have a width W that equals the longitudinal extension of the[0062]outer adapter surface6 as shown in FIG. 5, in which case there in fact is no protrusions but simply a relatively large diameter D of the entireouter adapter surface6.
• The[0063]circular protrusion9 shown in FIG. 3 is located in a specific distance L from thedistal end surface4. Instead of providing thecircular protrusion9 with different diameters, the general idea of the present invention could also be realised by providing thecircular protrusion9 in different distances L from thedistal end surface4 for different insulin concentrations. It is apparent that only onecircular protrusion9 is needed in this case. The distance L could e.g. be chosen as a little distance for an insulin with a concentration of 200 IU pr. ml. and a greater distance for an insulin with a concentration of 100 IU pr. ml. Thecartridge receiving part11,12 of the medical delivery system could then be made with an inside located neck or shoulder with a narrow diameter preventing thecartridge2 containing insulin with a concentration on 200 IU pr. ml. to fully enter the cartridge receiving part of a medical deliver system designed for insulin with a concentration on 100 IU pr. ml.
• Some preferred embodiments have been shown in the foregoing, but it should be stressed that the invention is not limited to these, but may be embodied in other ways within the subject matter defined in the following claims.[0064]

Claims (11)

We claim:

1. A cartridge containing a fluid medicament, which cartridge comprises a distal end, a proximal end and an outer cartridge surface there between,

characterized in that

the cartridge carries a mechanical coding at the distal end.

2. A cartridge according toclaim 1, characterized in that, the outer cartridge surface is cylindrical and that the mechanical coding is one or more protrusions extending radial outwards from the distal end of the outer cartridge surface.

3. A cartridge according toclaim 1, characterized in that said distal end is provided with a an adapter comprising a distal end surface, a proximal end surface and an outer adapter surface there between, and which outer adapter surface carries the mechanical coding.

4. A cartridge according toclaim 3, characterized in that, the outer adapter surface is substantial cylindrical and that the mechanical coding is one or more protrusions extending radial outwards from the outer adapter surface.

5. A cartridge according toclaim 4, characterized in that, the protrusion or protrusions together form at least one substantially circular protrusion.

6. A cartridge according toclaim 5, characterized in that, the outer diameter of the circular protrusion indicates a parameter of the medicament contained in the cartridge.

7. A cartridge according toclaim 6, characterized in that, the medicament is insulin and that a specific diameter of the circular protrusion is dedicated a specific concentration of the insulin.

8. A cartridge according toclaim 7, characterized in that, the larger concentration has the larger diameter.

9. A medical delivery system comprising a housing for accommodating a cartridge containing a fluid medicament according to anyone of theclaim 8,

characterized in that

the mechanical coding on the outer cartridge surface or the outer adapter surface is received in a contour in the housing or in a part of the housing, which contour has an inside shape conforming to the outside shape of the mechanical coding.

10. A medical delivery system comprising a housing for accommodating a cartridge containing a fluid medicament according to anyone of theclaim 8,

characterized in that,

the fluid medicament contained in the cartridge is delivered into a human body through a conduit having a first end mounted onto the cartridge or the adapter and a second end inserted into the human body, the first end of the conduit having a contour, conforming to the outside shape of the mechanical coding carried on the outer cartridge surface or the outer adapter surface.

11. A medical delivery system according toclaim 10, characterized in that, the medicament contained in the cartridge is insulin, the mechanical coding is a substantially circular protrusion and that a specific outside diameter of the circular protrusion is dedicated a specific concentration of insulin and which outside diameter is chosen as a larger diameter for a higher concentration.

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