HK1223580B - Injector for administering a liquid or pasty substance, in particular a drug - Google Patents

Description

A syringe used to administer liquids or pastes, especially medicines

Technical Field

The present invention relates to a syringe for administering a first or second liquid or paste. The first and/or second liquid or paste may in particular be a drug or a substance containing one or more drugs.

Summary of the Invention

The syringe comprises an outer syringe body, an inner syringe body, and a piston. A first volume for a first liquid or paste is formed in the outer syringe body. A second volume for a second liquid or paste is formed in the inner syringe body. The inner syringe body is longitudinally displaceably guided in the outer syringe body, thereby allowing it to be longitudinally guided in a rotational or non-rotational manner. The piston is longitudinally displaceably guided in the inner syringe body, thereby allowing it to be longitudinally guided in a rotational or non-rotational manner.

In the outer syringe body, the inner syringe body is first moved by the movement of the piston. The first liquid or paste is thus dispensed through an opening in the bottom wall area of the outer syringe body. When the inner syringe body has reached its end position in the outer syringe body, the piston can be moved in the inner syringe body. Then the second liquid or paste can be dispensed.

A syringe according to the preamble of claim 1 is known from DD 210 386 B.

US Pat. No. 2,157,503 A discloses a syringe into which an ampoule filled with a liquid can be introduced. A tablet containing a pharmaceutical preparation can be mixed with the liquid in the ampoule.

A blood removal and blood isolation system is known from DE 695 31 774 T2, which comprises a syringe barrel, a main piston and a dispensing piston.

It is an object of the present invention to provide an improved syringe of the type initially named.

According to the present invention, this object is achieved by the features of claim 1. The inner syringe body comprises a sleeve that sealingly contacts the inner wall of the outer syringe body. The sleeve sealingly contacts the inner wall of the outer syringe body, particularly during movement of the inner syringe body within the outer syringe body. When the sleeve is in its end position within the outer syringe body, a second liquid or paste can flow around it. This ensures that the second liquid or paste can be dispensed after the first liquid or paste has been dispensed.

Advantageous further developments of the invention are described in the dependent claims.

It is advantageous if the outer syringe body has one or more channels in its end region. The one or more channels can be located in the inner wall of the end region of the outer syringe body. Since the second liquid or paste flows through the one or more channels, the second liquid or paste can flow around the envelope when the envelope is in the end position in the outer syringe body.

The sleeve preferably has one or more grooves on its underside through which the second liquid or paste can flow when the sleeve is in its end position in the outer syringe body.

Another advantageous further development is characterized in that the envelope is deformed in such a way that a flow can flow around it when it is in the end position in the outer syringe body. A channel can be formed by the deformation of the envelope, which channel is flowed through by the second liquid or paste when the envelope is in the end position in the outer syringe body.

It is advantageous if webs are provided in the end region of the outer syringe body. These webs are preferably arranged in the bottom wall of the outer syringe body. The envelope can be deformed by the webs. The second liquid or paste can flow through the region between the webs. It is advantageous if there are more than two webs. The webs are preferably evenly distributed around the circumference.

The syringe according to the present invention can preferably be used to administer one or more liquids and/or one or more pastes and/or one or more medications into the udder of an animal. Thus, it can be used in particular as a udder syringe.

Advantageously, the envelope is releasably connectable to the inner syringe body.

However, it may also be advantageous for the envelope to be formed integrally with the inner syringe body.

According to another advantageous further development, one or more channels are provided in the inner syringe body, in particular in its bottom wall.

The one or more channels may extend at least partially in a radial direction.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the accompanying drawings:

FIG1 is a cross-sectional view of a syringe in a first embodiment of the present invention at a starting position;

FIG2 is a diagram of the syringe of FIG1 after dispensing a first liquid or paste;

FIG3 is a diagram of the syringe of FIG1 and FIG2 after dispensing a second liquid or paste;

FIG4 is an enlarged detail view of FIG3 ;

FIG5 is a cross-sectional view of a syringe in a second embodiment of the present invention at a starting position;

FIG6 is a diagram of the syringe of FIG5 after dispensing a first liquid or paste;

FIG7 is a view of the syringe of FIG5 and FIG6 after dispensing a second liquid or paste;

FIG8 is an enlarged detail view of FIG7;

FIG9 is a diagram of a modified embodiment of the first embodiment of the present invention, in which the envelope is formed integrally with the inner syringe body;

FIG10 is an enlarged detail view of FIG9; and

FIG. 11 is a diagram of a modification of the embodiment according to FIG. 9 and 10 , in which the channel extends radially in part in the inner syringe body.

DETAILED DESCRIPTION

The syringe according to the first embodiment of the present invention shown in Figures 1 to 4 comprises an outer syringe body 1, an inner syringe body 2 and a piston 3. The outer syringe body 1 comprises an upper edge 4 directed outward, a jacket portion 5, a bottom wall 6, and a dispensing spout 7. The jacket portion 5 is cylindrical. It has an inner wall 8 along which the inner syringe body 2 is longitudinally movably guided. The bottom wall 6 has a dispensing opening 9 at its center, which is connected to a dispensing channel 10 in the dispensing spout 7. The outer syringe body 1 is formed in one piece.

The inner syringe body 2 comprises a sheath body 11, a bottom wall 12, and a sleeve 13. The sheath portion 11 is cylindrical. Its outer wall is longitudinally movably guided along the inner wall 8 of the sheath portion 5 of the outer syringe body 1. To this end, the sheath portion 11 has a sealing surface 11a at its lower end, the diameter of which is greater than the remaining diameter of the sheath portion 11. The sealing surface 11a contacts the inner wall 8. The main function of the sealing surface 11a is to ensure sealing. In addition, it also fulfils a guiding function.

The jacket part 11 has an inner wall 14 in which the piston 3 is guided longitudinally displaceably. Channels 15 are present in the bottom wall 12 of the inner syringe body 2. The channels 15 are evenly distributed around the circumference.

The bottom wall 12 has a projection 16 on its underside facing the bottom wall 6 of the outer syringe body 1, onto which the sleeve 13 is inserted. The sleeve 13 is releasably connected to the projection 16 in this way. The projection 16 has a bead 17 with an enlarged diameter in its lower end region facing the bottom wall 6 of the outer syringe body 1. The bead 17 is rounded outward. The sheath portion 11, the bottom wall 12, and the projection 16 of the inner syringe body 2 are formed as one piece.

The piston 3 comprises an upper edge 18 guided outwards, a piston body 19, a guiding surface 20 and a sealing portion 21. The piston body 19 has a cross-shaped cross section. However, it can be configured in a different way and can be cylindrical in particular. The diameter of the inner wall 14 of the jacket portion 11 of the inner syringe body 2 is larger than the outer diameter of the piston body 19. The guiding surface 20 of the piston 3 is in contact with the inner wall 14 of the jacket portion 11 of the inner syringe body 2. It is guided at the inner wall 14. The sealing portion 21 sealingly contacts the inner wall 14 of the jacket portion 11 of the inner syringe body 2. The diameter of the lower sealing portion 21 facing the bottom wall 12 of the inner syringe body 2 is larger than the diameter of the upper sealing portion 21 facing the upper edge 18 of the piston 3. The lower sealing portion 21 forms the main seal and the upper sealing portion 21 forms an additional seal.

During operation, the syringe is initially positioned as shown in FIG1 . The envelope 13 of the inner syringe body 2 is spaced apart from the bottom wall 6 of the outer syringe body 1 . This creates a first volume 22 for a first liquid or paste. The lower end face 23 of the piston 3 is spaced apart from the bottom wall 12 of the inner syringe body 2. This creates a second volume 24 for a second liquid or paste.

At the start of the dispensing process, the piston 3 moves downward in the direction of arrow 25. In this respect, the piston 3 and the inner syringe body 2 move downward together relative to the outer syringe body 1. The volume 24, the channel 25, and the annular space between the bottom wall 12 of the inner syringe body 2 and the envelope 13 form a space that is sealed as a whole, which is sealed via the seal 21 and the envelope 13. This space, which is sealed as a whole, ensures that the unit formed by the piston 3 and the inner syringe body 2 first moves downward together relative to the outer syringe body 1.

As a result, the piston 3 and the inner syringe body 2 move downwards together relative to the outer syringe body 1. The sleeve 13 is thereby moved towards the bottom wall 6 of the outer syringe body 1, so that the size of the first volume 22 is reduced and the first liquid or paste located in the first volume is pressed out through the dispensing opening 9 and the dispensing channel 10.

This process is carried out until the position shown in Figure 2 is reached, in which the envelope 13 is in its end position in the outer syringe body 2. In this lower end position, the envelope 13 contacts the bottom wall 6 of the outer syringe body 1.

The outer syringe body 1 has a plurality of channels 26 in its end region. The channels 26 are located in the inner wall 8 of the jacket part 5 of the outer syringe body 1. The channels begin at the bottom wall 6 of the outer syringe body 1 and extend upwards from there. The channels are long enough so that they extend beyond the upper end face of the cuff 13 when the cuff 13 is in its end position as shown in Figures 2 and 4. In addition, the depth dimension of the channels 26 is set so that they extend further outwards in the circumferential direction than the outer diameter of the cuff 13. In this way, the channels 26 form a path for the flow around the cuff 13. The channels 26 are evenly distributed around the periphery of the jacket part 5 of the outer syringe body 1.

The envelope 13 has a plurality of grooves 26a on its underside. The grooves 26a extend in a radial direction. They extend from inward and downward to outward and upward. The grooves 26a are evenly distributed around the circumference of the envelope 13. The grooves 26a prevent the underside of the envelope 13 from completely and sealingly resting on the upper boundary of the outlet opening 9. In this way, the grooves 26a form a path for flow around the envelope 13.

When the syringe has reached the position shown in FIG2 , the piston 3 moves further downward. Its lower end surface 23 moves toward the bottom wall 12 of the inner syringe body 2. This causes the size of the second volume 24 to decrease. Due to this movement, the second liquid or paste located therein bypasses the envelope 13 and is pressed into the dispensing opening 9 and the dispensing channel 10 through the channels 15 and 26 and the groove 26a. The piston 3 continues to move until it reaches the end position shown in FIG3 . In this position, the lower end surface 23 of the piston 3 contacts the bottom wall 12 of the inner syringe body 2.

In the syringe according to the second embodiment of the invention shown in Figures 5 to 8, in which identical parts are provided with the same reference numerals, no further description will be given. Here, the outer syringe body 1 has a web 27 in its end region. The web 27 is connected to the bottom wall 6 of the outer syringe body 1. The web 27 protrudes upward from the bottom wall 6 toward the envelope 13. The web 27 is integrally connected to the bottom wall 6. The web 27 extends from downward to inward toward outward to upward. The webs 27 are evenly distributed around the periphery. In this embodiment, there are six webs 27.

Between the two webs 27 there are raised portions 28. They face upwards, i.e. towards the envelope 13. The raised portions 28 are located near the dispensing opening 9 in the bottom wall 6 of the outer syringe body 1. The raised portions 28 are evenly distributed around the circumference. The raised portions 28 form an abutment for the envelope 13.

The envelope 13 is deformable. It is deformable at least in its outer region. When the envelope 13 is moved toward its end position shown in Figures 6, 7, and 8, its outer region is deformed upward by the webs 27, that is, toward the bottom wall 12 of the inner syringe body 2. The outer edge of the envelope 13 is thus separated from the inner wall 8 of the outer syringe body 1. The envelope 13 is therefore no longer in sealing contact with the inner wall 8. The second liquid or paste can flow around it in the area between the webs 27.

The path of the envelope 13 towards the bottom wall 6 is defined by the raised portion 28, which forms an abutment for the lower end face of the envelope 13. This ensures that the lower end face of the envelope 13 does not completely contact the upper boundary of the dispensing opening 9, so that the second liquid or paste can flow out from the area of the bottom wall 6, pass through the lower end face of the envelope 13 and enter the dispensing opening 9.

The two-component syringe (also referred to as a 2C syringe) provided by the present invention can give two different components in sequence. The two different components are stored separately in the 2C syringe, i.e., in its volumes 22 and 24. They will not mix or affect each other.

During operation, the inner syringe body 2 of the syringe 2C is moved in the outer syringe body 1 by pressing the piston 3, whereby the first component is pressed out through the dispensing channel 10 of the dispensing spout 7. As shown in Figures 2 and 6, when the first component has been completely pressed out of the outer syringe body 1, the inner syringe body 2 is in the end position in the outer syringe body 1. According to the first embodiment of Figures 1 to 4, in this end position, the envelope is exposed in the outer syringe body 1 by the channel 26. The second component can flow through the channel 15 of the inner syringe body 2 and through the channel 26 in the outer syringe body 1, and can be pressed into the dispensing spout 7 through the dispensing channel 10.

In the second embodiment according to Figures 5 to 8, the end position of the envelope 13 can be formed in the outer syringe body 1 by a raised portion 28, which can be formed as a web. A corresponding free space or channel is formed between the outer syringe body 1 and the envelope 13 by the raised portion 28 or web. In this end position, the envelope 13 is deformed by the web 27 in the outer syringe body, causing it to leak. The second component can then move through the channel 15 of the inner syringe body 2 and through the deformed, leaking envelope 13 into the outer syringe body 1 and be expelled through the dispensing spout 7.

9 and 10 show a modification of the first embodiment according to FIGS. 1 to 4 , in which the envelope 13 is formed in one piece with the inner syringe body 2 .

In another variant according to FIG11 , the envelope 13 is likewise formed integrally with the inner syringe body 2. Here, the channel 15 comprises a common portion 15 and a radial portion 15′ extending from the volume 24 to the annular gap between the bottom wall 12 of the inner syringe body 2 and the envelope 13. The common portion 15 is located in the center of the bottom wall 12. Here, it extends axially downwards. The radial portion 15′ extends radially outwards from the lower end of the common portion 15 to the annular gap. The embodiment according to FIG11 can also be used in the case where the envelope 13 is releasably connected to the inner syringe body 2.

Claims (12)

1. A syringe for dispensing first and second liquids or pastes, comprising an outer syringe body (1) in which an inner syringe body (2) is longitudinally displaceable, and in which a piston (3) is longitudinally displaceable. Its features are, The inner syringe body (2) has a sheath body (11), a bottom wall (12), and a cover (13), the cover (13) sealingly contacting the inner wall (8) of the outer syringe body (1), and the second liquid or paste can flow around it when it is in the end position in the outer syringe body (1), the outer syringe body (1) having one or more channels (26) in its end region, and the cover (13) having one or more grooves (26a) on its underside. The sheath body (11) is cylindrical and has a sealing surface (11a) at its lower end. The diameter of the sealing surface is larger than the remaining diameter of the sheath body (11). The sealing surface (11a) contacts the inner wall (8). At least one channel is formed in the bottom wall of the inner syringe body (2) to connect the interior of the inner syringe body (2) with the annular space between the bottom wall (12) of the inner syringe body (2) and the sheath (13). 2. The syringe according to claim 1, characterized in that it has a raised portion (28) in the bottom wall (6) of the outer syringe body (1). 3. The syringe according to claim 1 or 2, wherein the sleeve (13) is releasably connected to the inner syringe body (2). 4. The syringe according to claim 1 or 2, wherein the sleeve (13) is integrally formed with the inner syringe body (2). 5. The syringe according to claim 1 or 2, wherein the first and second liquids or pastes are drugs. 6. The syringe according to claim 5, wherein the channel formed in the bottom wall of the inner syringe body (2) extends at least partially in the radial direction. 7. A syringe for dispensing first and second liquids or pastes, comprising an outer syringe body (1) in which an inner syringe body (2) is longitudinally displaceable, and in which a piston (3) is longitudinally displaceable. Its features are, The inner syringe body (2) has a sheath body (11), a bottom wall (12), and a sleeve (13), the sleeve (13) sealingly contacting the inner wall (8) of the outer syringe body (1), and the second liquid or paste can flow around it when it is located at the end position in the outer syringe body (1). The sleeve (13) at the end position in the outer syringe body (1) can be deformed by the web (27) in the end region of the outer syringe body (1), so that the flow can bypass the sleeve (13) when the sleeve (13) is located at the end position in the outer syringe body (1). The sheath body (11) is cylindrical and has a sealing surface (11a) at its lower end. The diameter of the sealing surface is larger than the remaining diameter of the sheath body (11). The sealing surface (11a) contacts the inner wall (8). At least one channel is formed in the bottom wall of the inner syringe body (2) to connect the interior of the inner syringe body (2) with the annular space between the bottom wall (12) of the inner syringe body (2) and the sheath (13). 8. The syringe according to claim 7, characterized in that it has a raised portion (28) in the bottom wall (6) of the outer syringe body (1). 9. The syringe according to claim 7 or 8, wherein the sheath (13) is releasably connected to the inner syringe body (2). 10. The syringe according to claim 7 or 8, wherein the sleeve (13) is integrally formed with the inner syringe body (2). 11. The syringe according to claim 7 or 8, wherein the first and second liquids or pastes are drugs. 12. The syringe according to claim 11, wherein the channel formed in the bottom wall of the inner syringe body (2) extends at least partially in the radial direction.