WO2003047668A1 - A medical delivery system - Google Patents

A medical delivery system Download PDF

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Publication number
WO2003047668A1
WO2003047668A1 PCT/DK2002/000813 DK0200813W WO03047668A1 WO 2003047668 A1 WO2003047668 A1 WO 2003047668A1 DK 0200813 W DK0200813 W DK 0200813W WO 03047668 A1 WO03047668 A1 WO 03047668A1
Authority
WO
WIPO (PCT)
Prior art keywords
plunger
spherical
plunger rod
semi
back wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DK2002/000813
Other languages
French (fr)
Inventor
Lars Korsbjerg Nielsen
Lars Thougaard Kristensen
Erik Stentoft
Matias Melander
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novo Nordisk AS
Original Assignee
Novo Nordisk AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Novo Nordisk AS filed Critical Novo Nordisk AS
Priority to AU2002349298A priority Critical patent/AU2002349298A1/en
Priority to JP2003548921A priority patent/JP4401779B2/en
Priority to DE60221702T priority patent/DE60221702T2/en
Priority to EP02781170A priority patent/EP1455870B1/en
Publication of WO2003047668A1 publication Critical patent/WO2003047668A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M5/31515—Connection of piston with piston rod

Definitions

  • the invention relates to a medication delivery device for delivering medicine or other fluent material into a mammal body, and especially to a medication delivery device where a plunger located in a tubular cartridge is connected to a plunger rod.
  • Medication delivery devices are widely used throughout the health sector for delivering fluent medicine into mammal bodies through a conduit inserted in the body.
  • the first type being an injection device, which injects a predetermined dose of the fluent medicine into a mammal body whenever the injection de- vice is activated.
  • the other type being an infusion device, which delivers a constant rate of medicine into a mammal body either by gravity or by pressure, which pressure are usually generated by an electrical motor.
  • the fluent medicine is usually contained in a cartridge, which can be either a tillable cartridge or a pre-filled disposable cartridge.
  • a cartridge which can be either a tillable cartridge or a pre-filled disposable cartridge.
  • Such known cartridges are e.g. provided as a cylindrical barrel having a penetrable membrane at a distal end and a movable plunger at the opposite proximal end. A conduit penetrating the membrane is mounted at the distal end.
  • tillable cartridge which are filled with the medicament prior to use.
  • Such tillable cartridge usually has a plunger having the back wall pro- vided with an interior thread into which a pull rod is screwed.
  • the plunger can then be moved backwards inside the tillable cartridge, and the cartridge can be filled with medicine from a vial.
  • the plunger is disconnected from the pull rod and connected to the pump plunger rod.
  • the assembled cartridge and plunger rod are then inserted into the infusion pump.
  • the plunger rod is not located at the centre of the plunger, the plunger might tilt once the plunger rod is connected with the plunger rod. When the plunger tilts the sealing between the cartridge wall and the plunger will become leaky.
  • auxiliary part such as Velcro tape, a magnet or a ball and socket connection at the centre of the plunger. This will ensure that the plunger rod will always connect the plunger at the centre. It is however rather cumbersome from a manufactures point of view and will give rise to a number of failures if the auxiliary part has been disconnected from the plunger prior to use.
  • pre-filled cartridges When using pre-filled cartridges, it would be preferred if the same pre-filled cartridge can be used both for pump systems and for traditional pen syringes.
  • pen syringes there are how- ever no connection between the plunger and the plunger rod.
  • the plunger rod has a somewhat flat end, which abuts the plunger. If auxiliary parts are permanently mounted on the plunger, it will be impossible to use the cartridge in an ordinary pen syringe.
  • the plunger with an interior cavity engaged by a spherical or semi spherical portion of the plunger rod.
  • the spherical shaped portion is provided with indentations.
  • connection can be connected and disconnected using only a limited amount of force, because the indentations allow air in the plunger cavity to escape during plunger rod connection thereby avoiding a counteract pressure build up.
  • the same situation occurs during disconnection as air need to pass through the indentations to avoid counteract under pressure i.e. vacuum in the plunger cavity.
  • the diameter of a circular orifice or the minimum cross section of a non-circular orifice has the same diameter as the spherical or semi spherical shaped portion of the plunger rod, a connection, which is very easy to disconnect, is obtained.
  • the diameter of the spherical or semi spherical shaped portion of the plunger rod is larger than the minimum cross section or diameter of the open orifice of the plunger as specified in claim 2, the connection will be somewhat tighter.
  • a suitable disconnectable grip is possible if the outside diameter of the spherical or semi spherical shaped end portion of the plunger rod and the inside diameter of the interior cavity is approximately between 3 to 7 mm and preferably around 5 to 6 mm for a cartridge of 9 to 11 mm, while the diameter of the open orifice should be approximately between 3,5 to 7, mm, preferably around 4 to 5 mm.
  • the indentations are preferably made such that the spherical or semi spherical shaped portion of the plunger rod has a cross-shaped cross section perpendicular to the longitudinal axis of the plunger rod, as disclosed in claim 3. This provides a suitable connection between the plunger rod and the plunger, where the force needed to disconnect the two parts are de- termined by the width of the arms of the cross in combination with the diameter of the cross and of the open orifice.
  • bulging of a flexible plunger gives rise to either back suction or after drip when the plunger returns to its initiate form after it has been compressed, bulging should be avoided.
  • the point of contact between the plunger rod and the plunger should be located as close to the front wall of the plunger as possible.
  • the plunger rod is easier guided into the open orifice if the most distal end of the plunger rod has the shape of a spherical cap such as indicated in claim 4.
  • the open orifice can be made circular with protrusions, as specified in claim 6. This will also allow air to escape from the cavity during connection, and air to pass into the cavity during disconnection.
  • the circular cross section of the open orifice has a diameter substantially equal to or larger than the diameter of the spherical or semi spherical shaped portion of the plunger rod and the cross section formed between the protrusions are smaller than the diameter of the spherical or semi spherical shaped portion of the plunger rod it is ensured that the connection is easy disconnectable.
  • the open orifice could also be provided with a non-circular cross section as specified in claim 9, as this will also allow air to escape from the cavity during connection, and air to pass into the cavity during disconnection.
  • the minimum cross section of the open non-circular orifice should be substantially the same or smaller than the diameter of the spherical or semi spherical portion of the plunger rod, such as cited in claim 10.
  • the term "semi spherical” is used to describe an object such as a cavity or an end portion of a plunger having a three-dimensional geometry where at least a part of the surfaces has the shape of a spherical cap.
  • Figure 1 to 5 Show a sectional view of a plunger according to an embodiment of the invention.
  • Figure 6 Show a sectional view of a plunger according to an embodiment of the invention having protrusions.
  • Figure 7 to 12 Show a top view of a plunger according to an embodiment of the invention.
  • Figure 13 Show a sectional view of a plunger rod according to an embodiment of the invention
  • Figure 14 Show a sectional view of a plunger rod according to an embodiment of the invention having a cross-shaped end portion.
  • Figure 15 to 18 Show a sectional view of a plunger rod according to an embodiment of the invention having different forms of apertures.
  • Figure 19-20 Show a sectional view of a plunger rod according to an embodiment of the invention having outwardly pointing protrusions.
  • Figure 21 Show a sectional view of a plunger rod according to an embodiment of the invention having slots.
  • distal end is meant to refer to the end of cartridge where the fluid medicament is contained and where the conduit is inserted
  • proximal end is meant to refer to the opposite end where the plunger is located in its initial position.
  • Figure 1-6 shows different embodiments of a plunger 1 as seen from the side.
  • the plunger 1 illustrated in figure 1 has a front wall 2, which is in contact with the fluid medicament inside the cartridge and an opposite located back wall 3. Encapsulated in the inte- rior of the plunger 1 is a spherical cavity 4 provided. This cavity 4 is connected to the back wall 3 through an open orifice 5.
  • the cavity 4 is prolonged in the distal direction with an additional cylindrical appendix 6.
  • the cavity 4 shown in figure 3 has only a semi spherical shape, as the proximal end 7 of the cavity 4 has the shape of a spherical cap, while the distal end of the cavity has a cylindrical form.
  • Figure 4 also shows a semi spherical cavity 4 having the shape of a spherical cap at the distal end 8, while the proximal end has a cylindrical shape.
  • the proximal end of the open orifice 5 could be provided with an inlet 22, which makes it easier to load the plunger rod 6 into the open orifice 5.
  • the plunger illustrated in figure 5 has a cavity 4 similar to the cavity 4 shown in figure 4, however the open orifice has a diameter equal to the diameter of both the cylindrical part and the spherical cap part.
  • the open orifice 5 could be provided with protrusions 9 as illustrated in figure 6.
  • the number and size of the protrusions 9 can be chosen randomly in order to provide the grip needed for a particular injection or infusion system.
  • Figure 7 shows a top view of a plunger with two such protrusions 9, and figure 8 shows a plunger with four protrusions 9.
  • the open orifice 5 could have a substantially circular cross section 10 as shown in figure 9, or the cross section could be four-sided 11 as shown in figure 10 and figure 11.
  • the non- circular cross section of the open orifice 5 could in fact be any kind of polygon 12 as indi- cated in figure 12, or even any other shape e.g. shaped like a four-leaf.
  • the plunger rod 6 of the connection is shown in figure 13-20. When the spherical or semi spherical end portion 13 of the plunger rod 6 is inserted into the cavity 4 of the plunger 1 a hipbone connection is established.
  • a plunger rod 6 with a diameter substantially smaller than the diameter of the cartridge can be used without tilting the plunger 1 if the plunger rod 6 is pressed towards the side of the cartridge.
  • the plunger 1 and the plunger rod 13 are connected in a stiff or permanent connection, the plunger might tilt and cause leakage if the plunger rod 13 is not kept in the centre of the cartridge, a hipbone connection however solves this problem.
  • Figure 13 illustrates a plunger rod 6 with a spherical shaped end portion 13 located at the distal end of the plunger rod 6.
  • this spherical shaped portion 13 is preferably provided with tracks, slots, apertures or similar indentations as illustrated in figure 14-18.
  • the spherical shaped end portion 13 of the plunger rod 6 has a cross-shaped cross section when viewed perpendicular to the longitudinal axis of the plunger rod 6.
  • the cross 14 has four arms, which arms each abuts the imaginary diameter of the spherical end portion 13.
  • the space 15 between the arms can off cause vary in size, which is also the case for the number of arms.
  • figure 14 and figure 14a shows a schematic view of the cross section of the spherical part 13.
  • the space 15 needs not extend through the full longitudinal diameter of the spherical shaped portion 13, but could end at a line 16 leaving a spherical cap 17 at the most distal end of the spherical end portion 13, as shown in figure 14a.
  • plunger rods 6 A number of different plunger rods 6 are disclosed in figure 15-17. These plunger rods 6 has a spherical portion 13 at the distal end with indentations 18. These indentations all leave a spherical cap 17 at the most distal end of the plunger rod 6.
  • Figure 18 shows a plunger rod 6 where the spherical portion 13 is provided with indentations leaving a spherical cap 17 at the proximal end of the spherical end portion 13
  • the distal end of the plunger rod 6 could also, as shown in figure 19, be provided with a semi spherical end portion 19 which could be provided with outwardly pointing protrusions 20 in order to enhance the grip.
  • Such protrusions 20 could also be provided at the spherical end portion 13 of the plunger rod 6 as shown in figure 20.
  • Figure 21 shows a plunger rod 6 with a spherical end portion 13 having two slots 21.
  • a schematic view of the cross section of the spherical part 13 is also included.

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  • Health & Medical Sciences (AREA)
  • Hematology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
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  • Infusion, Injection, And Reservoir Apparatuses (AREA)
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Abstract

A disconnectable connection between a plunger and a plunger rod in a medical delivery system is provided. The plunger comprises a spherical or semi spherical shaped cavity, which is fully encapsulated in the interior of the plunger and connected to the back wall of the plunger through an open orifice. The Plunger rod has a spherical or semispherical portion provided at the distal end, which portion enters into the plunger cavity when the two parts are connected. In order to allow air in the plunger cavity to escape during plunger rod connection, is either the distal portion of the plunger rod or the open orifice in the plunger back wall provided with tracks, slots, apertures or similar geometries.

Description

A Medical Delivery System
The Technical field of the invention:
The invention relates to a medication delivery device for delivering medicine or other fluent material into a mammal body, and especially to a medication delivery device where a plunger located in a tubular cartridge is connected to a plunger rod.
Description of related art:
Medication delivery devices are widely used throughout the health sector for delivering fluent medicine into mammal bodies through a conduit inserted in the body. In general two types of medication delivery devices exist. The first type being an injection device, which injects a predetermined dose of the fluent medicine into a mammal body whenever the injection de- vice is activated. The other type being an infusion device, which delivers a constant rate of medicine into a mammal body either by gravity or by pressure, which pressure are usually generated by an electrical motor.
The fluent medicine is usually contained in a cartridge, which can be either a tillable cartridge or a pre-filled disposable cartridge. Such known cartridges are e.g. provided as a cylindrical barrel having a penetrable membrane at a distal end and a movable plunger at the opposite proximal end. A conduit penetrating the membrane is mounted at the distal end.
When the plunger is moved towards the membrane the fluent medicament contained in the cartridge is pressed out through the conduit. When the conduit is mounted it is however possible for the medicament to escape out through the conduit and for the plunger to move towards the distal end only by the influence of gravity. In delivery systems such as pump systems, where the conduit is in contact with the fluid medicament for a substantial period of time, it is normal procedure to connect the plunger to the plunger rod in order to provide a controlled forward movement of the plunger thereby preventing the cartridge from emptying itself.
Some infusions pumps available today have a tillable cartridge, which are filled with the medicament prior to use. Such tillable cartridge usually has a plunger having the back wall pro- vided with an interior thread into which a pull rod is screwed. The plunger can then be moved backwards inside the tillable cartridge, and the cartridge can be filled with medicine from a vial. Once the reusable cartridge has been filled, the plunger is disconnected from the pull rod and connected to the pump plunger rod. The assembled cartridge and plunger rod are then inserted into the infusion pump.
It is however desirable to use pre-filled cartridges in pump systems. A major problem in fulfilling this desire is to obtain a suitable connection between the plunger rod of the pump system and the plunger of such pre-filled cartridge.
Different ways of connecting a plunger in a pre-filled cartridge with a plunger rod is disclosed in WO 98.11927.
If the plunger rod is not located at the centre of the plunger, the plunger might tilt once the plunger rod is connected with the plunger rod. When the plunger tilts the sealing between the cartridge wall and the plunger will become leaky.
One way of preventing tilting is, as also disclosed in WO 98/11927, by providing an auxiliary part such as Velcro tape, a magnet or a ball and socket connection at the centre of the plunger. This will ensure that the plunger rod will always connect the plunger at the centre. It is however rather cumbersome from a manufactures point of view and will give rise to a number of failures if the auxiliary part has been disconnected from the plunger prior to use.
When using pre-filled cartridges, it would be preferred if the same pre-filled cartridge can be used both for pump systems and for traditional pen syringes. In pen syringes there are how- ever no connection between the plunger and the plunger rod. Usually the plunger rod has a somewhat flat end, which abuts the plunger. If auxiliary parts are permanently mounted on the plunger, it will be impossible to use the cartridge in an ordinary pen syringe.
An infusion system into which a pre-filled syringe is mounted is disclosed in US 5.928.202. The plunger rod shown in this system is at the distal end provided with a ball-shaped portion and the plunger is provided with a spherical cavity into which the ball-shaped portion can be loaded. The channel of the pre-filled syringe has at the proximal end a funnel-shaped part, which closes the cavity of the plunger around the ball-shaped portion of the plunger rod as the plunger rod is advanced forward. The presence of the funnel-shaped part makes it im- practicable to use this solution for a glass cartridge, since these are normally produced with a constant inside diameter, thus it is generally considered an inconvenience to have an uneven outer diameter on a cartridge. The design disclosed in US 5.928.202 does not allow plunger rod disconnection when the plunger is located outside the funnel-shaped zone, and the size of the disconnection force is depended on the exact position of the plunger in the funnel- shaped zone.
In ordinary syringes the plunger is drawn backwards both when the medicament is drawn into the syringe from a vial, and when the injection is being performed to ensure that the needle has not struck a blood vessel. It is therefore a major concern for these types of sy- ringes to ensure that the connection between the plunger and the plunger rod is permanent. Such a connection involving a ball and socket connection which cannot be disconnected is disclosed in EP 395.211 , figure 12.
If a ball-shaped portion of a plunger rod is pressed into an interior spherical cavity in a plunger through a circular orifice having a diameter smaller than the diameter of the ball- shaped portion it will be very difficult to disconnect the two parts, and such a connection would henceforth be characterized as permanent.
Description of the invention:
It is an object of the present invention to provide a disconnectable ball and socket connection which can be used for pre-filled cartridges of the types having a constant inside diameter and which pre-filled cartridges can be used both in pump systems and in ordinary pen type injection systems.
In order to overcome the drawbacks of the prior art it is herein suggested to provide the plunger with an interior cavity engaged by a spherical or semi spherical portion of the plunger rod. According to claim 1 the spherical shaped portion is provided with indentations.
By providing the ball-shaped portion with a number of suitable indentations it has surprisingly been found that the connection can be connected and disconnected using only a limited amount of force, because the indentations allow air in the plunger cavity to escape during plunger rod connection thereby avoiding a counteract pressure build up. The same situation occurs during disconnection as air need to pass through the indentations to avoid counteract under pressure i.e. vacuum in the plunger cavity. If the diameter of a circular orifice or the minimum cross section of a non-circular orifice has the same diameter as the spherical or semi spherical shaped portion of the plunger rod, a connection, which is very easy to disconnect, is obtained. If however the diameter of the spherical or semi spherical shaped portion of the plunger rod is larger than the minimum cross section or diameter of the open orifice of the plunger as specified in claim 2, the connection will be somewhat tighter.
A suitable disconnectable grip is possible if the outside diameter of the spherical or semi spherical shaped end portion of the plunger rod and the inside diameter of the interior cavity is approximately between 3 to 7 mm and preferably around 5 to 6 mm for a cartridge of 9 to 11 mm, while the diameter of the open orifice should be approximately between 3,5 to 7, mm, preferably around 4 to 5 mm.
The indentations are preferably made such that the spherical or semi spherical shaped portion of the plunger rod has a cross-shaped cross section perpendicular to the longitudinal axis of the plunger rod, as disclosed in claim 3. This provides a suitable connection between the plunger rod and the plunger, where the force needed to disconnect the two parts are de- termined by the width of the arms of the cross in combination with the diameter of the cross and of the open orifice.
Since bulging of a flexible plunger gives rise to either back suction or after drip when the plunger returns to its initiate form after it has been compressed, bulging should be avoided. In order to minimize bulging of the plunger, which is preferably made from a resilient material such as an elastomeric rubber composition, the point of contact between the plunger rod and the plunger should be located as close to the front wall of the plunger as possible.
It has also been fund that the plunger rod is easier guided into the open orifice if the most distal end of the plunger rod has the shape of a spherical cap such as indicated in claim 4.
Instead of providing the spherical or semi spherical shaped portion of the plunger rod with indentations, the open orifice can be made circular with protrusions, as specified in claim 6. This will also allow air to escape from the cavity during connection, and air to pass into the cavity during disconnection. When as disclosed in claim 7, the circular cross section of the open orifice has a diameter substantially equal to or larger than the diameter of the spherical or semi spherical shaped portion of the plunger rod and the cross section formed between the protrusions are smaller than the diameter of the spherical or semi spherical shaped portion of the plunger rod it is ensured that the connection is easy disconnectable.
The open orifice could also be provided with a non-circular cross section as specified in claim 9, as this will also allow air to escape from the cavity during connection, and air to pass into the cavity during disconnection.
In order to obtain a good grip, the minimum cross section of the open non-circular orifice should be substantially the same or smaller than the diameter of the spherical or semi spherical portion of the plunger rod, such as cited in claim 10.
The connection between the plunger and the plunger rod as such is claimed in claim 5, 8 and 11.
Definitions
In the present context, the term "semi spherical" is used to describe an object such as a cavity or an end portion of a plunger having a three-dimensional geometry where at least a part of the surfaces has the shape of a spherical cap.
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:
Figure 1 to 5 Show a sectional view of a plunger according to an embodiment of the invention.
Figure 6 Show a sectional view of a plunger according to an embodiment of the invention having protrusions. Figure 7 to 12 Show a top view of a plunger according to an embodiment of the invention.
Figure 13 Show a sectional view of a plunger rod according to an embodiment of the invention
Figure 14 Show a sectional view of a plunger rod according to an embodiment of the invention having a cross-shaped end portion.
Figure 15 to 18 Show a sectional view of a plunger rod according to an embodiment of the invention having different forms of apertures.
Figure 19-20 Show a sectional view of a plunger rod according to an embodiment of the invention having outwardly pointing protrusions.
Figure 21 Show a sectional view of a plunger rod according to an embodiment of the invention having slots.
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.
Detailed Description of Embodiment:
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.
Initially it may be convenient to define that the term "distal end" is meant to refer to the end of cartridge where the fluid medicament is contained and where the conduit is inserted, whereas the term "proximal end" is meant to refer to the opposite end where the plunger is located in its initial position. Figure 1-6 shows different embodiments of a plunger 1 as seen from the side.
The plunger 1 illustrated in figure 1 has a front wall 2, which is in contact with the fluid medicament inside the cartridge and an opposite located back wall 3. Encapsulated in the inte- rior of the plunger 1 is a spherical cavity 4 provided. This cavity 4 is connected to the back wall 3 through an open orifice 5.
In the embodiment disclosed in figure 2, the cavity 4 is prolonged in the distal direction with an additional cylindrical appendix 6.
The cavity 4 shown in figure 3 has only a semi spherical shape, as the proximal end 7 of the cavity 4 has the shape of a spherical cap, while the distal end of the cavity has a cylindrical form.
Figure 4 also shows a semi spherical cavity 4 having the shape of a spherical cap at the distal end 8, while the proximal end has a cylindrical shape. The proximal end of the open orifice 5 could be provided with an inlet 22, which makes it easier to load the plunger rod 6 into the open orifice 5.
The plunger illustrated in figure 5 has a cavity 4 similar to the cavity 4 shown in figure 4, however the open orifice has a diameter equal to the diameter of both the cylindrical part and the spherical cap part.
In order to enhance the grip between the plunger 1 and the plunger rod 6 in the embodiment shown in figure 5, the open orifice 5 could be provided with protrusions 9 as illustrated in figure 6. The number and size of the protrusions 9 can be chosen randomly in order to provide the grip needed for a particular injection or infusion system.
Figure 7 shows a top view of a plunger with two such protrusions 9, and figure 8 shows a plunger with four protrusions 9.
The open orifice 5 could have a substantially circular cross section 10 as shown in figure 9, or the cross section could be four-sided 11 as shown in figure 10 and figure 11. The non- circular cross section of the open orifice 5 could in fact be any kind of polygon 12 as indi- cated in figure 12, or even any other shape e.g. shaped like a four-leaf. The plunger rod 6 of the connection is shown in figure 13-20. When the spherical or semi spherical end portion 13 of the plunger rod 6 is inserted into the cavity 4 of the plunger 1 a hipbone connection is established. Due to this hipbone connection a plunger rod 6 with a diameter substantially smaller than the diameter of the cartridge can be used without tilting the plunger 1 if the plunger rod 6 is pressed towards the side of the cartridge. When the plunger 1 and the plunger rod 13 are connected in a stiff or permanent connection, the plunger might tilt and cause leakage if the plunger rod 13 is not kept in the centre of the cartridge, a hipbone connection however solves this problem.
Figure 13 illustrates a plunger rod 6 with a spherical shaped end portion 13 located at the distal end of the plunger rod 6. In order to obtain a disconnectable connection this spherical shaped portion 13 is preferably provided with tracks, slots, apertures or similar indentations as illustrated in figure 14-18.
In the embodiment disclosed in figure 14, the spherical shaped end portion 13 of the plunger rod 6 has a cross-shaped cross section when viewed perpendicular to the longitudinal axis of the plunger rod 6. The cross 14 has four arms, which arms each abuts the imaginary diameter of the spherical end portion 13. The space 15 between the arms can off cause vary in size, which is also the case for the number of arms.
Both figure 14 and figure 14a shows a schematic view of the cross section of the spherical part 13.
The space 15 needs not extend through the full longitudinal diameter of the spherical shaped portion 13, but could end at a line 16 leaving a spherical cap 17 at the most distal end of the spherical end portion 13, as shown in figure 14a.
A number of different plunger rods 6 are disclosed in figure 15-17. These plunger rods 6 has a spherical portion 13 at the distal end with indentations 18. These indentations all leave a spherical cap 17 at the most distal end of the plunger rod 6.
Figure 18 shows a plunger rod 6 where the spherical portion 13 is provided with indentations leaving a spherical cap 17 at the proximal end of the spherical end portion 13 The distal end of the plunger rod 6 could also, as shown in figure 19, be provided with a semi spherical end portion 19 which could be provided with outwardly pointing protrusions 20 in order to enhance the grip. Such protrusions 20 could also be provided at the spherical end portion 13 of the plunger rod 6 as shown in figure 20.
Figure 21 shows a plunger rod 6 with a spherical end portion 13 having two slots 21. A schematic view of the cross section of the spherical part 13 is also included.
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.

Claims

Claims:
1. A medical delivery system comprising:
A cartridge with a distal end closed by a flexible membrane and a proximal end connected by a wall forming a vessel containing a liquid medicament,
A plunger received in the proximal end of the vessel and moved along the vessel in order to expel the fluid medicament, the plunger having a front wall in contact with the fluid medicament and an opposite back wall, which back wall is provided with a spherical or semi spheri- cal shaped cavity fully encapsulated in the interior of the plunger and connected to the back wall of the plunger through an open orifice,
A plunger rod which can be moved forward inside the vessel in order to move the plunger forward and which plunger rod is disconnectable connected to the plunger,
the disconnectable connection between the plunger and the plunger rod being obtained by a spherical or semi spherical portion provided at a distal end of the plunger rod engaging the spherical or semi spherical shaped cavity of the plunger,
characterized in that,
the spherical or semi spherical shaped portion is provided with tracks, slots, apertures or similar geometries.
2. A medical delivery system according to claim 1 , characterized in that, the diameter of the spherical or semi spherical shaped portion of the plunger rod is larger than the minimum cross section or diameter of the open orifice of the plunger.
3. A medical delivery system according to claim 1 or 2, characterized in that, the spherical or semi spherical shaped portion has a cross-shaped cross section perpendicular to the longitudinal axis of the plunger rod.
4. A medical delivery system according to anyone of the claims 1 to 3, characterized in that, the most distal end of the spherical or semi spherical shaped portion has the shape of a spherical cap.
5. A connection between a plunger and a plunger rod, which comprises in combination
a plunger with a front wall and a back wall, the plunger having an interior spherical or semi spherical shaped cavity connected to the back wall through an open orifice,
a plunger rod with a spherical or semi spherical shaped end portion, which end portion disconnectable engages the cavity of the plunger, such that the plunger and the plunger rod moves together,
characterized in that, the spherical or semi spherical shaped end portion of the plunger rod is provided with tracks, slots, apertures or similar geometries.
6. A medical delivery system comprising:
A cartridge with a distal end closed by a flexible membrane and a proximal end connected by a wall forming a vessel containing a liquid medicament,
A plunger received in the proximal end of the vessel and moved along the vessel in order to expel the fluid medicament, the plunger having a front wall in contact with the fluid medicament and an opposite back wall, which back wall is provided with a spherical or semi spherical shaped cavity fully encapsulated in the interior of the plunger and connected to the back wall of the plunger through an open orifice,
A plunger rod which can be moved forward inside the vessel in order to move the plunger forward and which plunger rod is disconnectable connected to the plunger,
the disconnectable connection between the plunger and the plunger rod being obtained by a spherical or semi spherical portion provided at a distal end of the plunger rod engaging the spherical or semi spherical shaped cavity of the plunger,
characterized in that, the open orifice has a substantially circular cross section provided with protrusions.
7. A medical delivery system according to claim 6, characterized in that, the circular cross section of the open orifice has a diameter substantially equal to or larger than the diameter of the spherical or semi spherical shaped portion of the plunger rod and that the cross section formed between the protrusions are smaller than the diameter of the spherical or semi spherical shaped portion of the plunger rod.
8. A connection between a plunger and a plunger rod, which comprises in combination
a plunger with a front wall and a back wall, the plunger having an interior spherical or semi spherical shaped cavity connected to the back wall through an open orifice,
a plunger rod with a spherical or semi spherical shaped end portion, which end portion disconnectable engages the cavity of the plunger, such that the plunger and the plunger rod moves together,
characterized in that the open orifice has a substantially circular cross section provided with protrusions.
9. A medical delivery system comprising:
A cartridge with a distal end closed by a flexible membrane and a proximal end connected by a wall forming a vessel containing a liquid medicament,
A plunger received in the proximal end of the vessel and moved along the vessel in order to expel the fluid medicament, the plunger having a front wall in contact with the fluid medicament and an opposite back wall, which back wall is provided with a spherical or semi spherical shaped cavity fully encapsulated in the interior of the plunger and connected to the back wall of the plunger through an open orifice,
A plunger rod which can be moved forward inside the vessel in order to move the plunger forward and which plunger rod is disconnectable connected to the plunger,
the disconnectable connection between the plunger and the plunger rod being obtained by a spherical or semi spherical portion provided at a distal end of the plunger rod engaging the spherical shaped cavity of the plunger, characterized in that, the open orifice has a non-circular cross section.
10. A medical delivery system according to claim 9, characterized in that, the minimum cross section of the orifice is substantially the same or smaller than the diameter of the spherical shaped or semi spherical portion of the plunger rod.
11. A connection between a plunger and a plunger rod, which comprises in combination
a plunger with a front wall and a back wall, the plunger having an interior spherical shaped cavity connected to the back wall through an open orifice,
a plunger rod with a spherical or semi spherical shaped end portion, which end portion disconnectable engages the cavity of the plunger, such that the plunger and the plunger rod moves together,
characterized in that, the open orifice has a non-circular cross section.
PCT/DK2002/000813 2001-12-06 2002-12-03 A medical delivery system Ceased WO2003047668A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU2002349298A AU2002349298A1 (en) 2001-12-06 2002-12-03 A medical delivery system
JP2003548921A JP4401779B2 (en) 2001-12-06 2002-12-03 Medical dosing system
DE60221702T DE60221702T2 (en) 2001-12-06 2002-12-03 MEDICAL DISTRIBUTION DEVICE
EP02781170A EP1455870B1 (en) 2001-12-06 2002-12-03 A medical delivery system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200101814 2001-12-06
DKPA200101814 2001-12-06

Publications (1)

Publication Number Publication Date
WO2003047668A1 true WO2003047668A1 (en) 2003-06-12

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PCT/DK2002/000813 Ceased WO2003047668A1 (en) 2001-12-06 2002-12-03 A medical delivery system

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US (1) US20030120219A1 (en)
EP (1) EP1455870B1 (en)
JP (1) JP4401779B2 (en)
AT (1) ATE369162T1 (en)
AU (1) AU2002349298A1 (en)
DE (1) DE60221702T2 (en)
WO (1) WO2003047668A1 (en)

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Also Published As

Publication number Publication date
DE60221702D1 (en) 2007-09-20
JP4401779B2 (en) 2010-01-20
ATE369162T1 (en) 2007-08-15
JP2005511158A (en) 2005-04-28
AU2002349298A1 (en) 2003-06-17
US20030120219A1 (en) 2003-06-26
DE60221702T2 (en) 2008-04-30
EP1455870B1 (en) 2007-08-08
EP1455870A1 (en) 2004-09-15

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