HK1051329B - Syringe barrel and cylinder holder - Google Patents

Description

Syringe tube and cylinder holder

Technical Field

The present invention relates to syringes and barrel holders adapted for injection at high injection pressures using a gearing mechanism such as an automatic injection device.

Background

The syringe is used for liquid injection in various fields including medical fields. The injection of chemical solutions with high viscosity, such as contrast agents for X-ray CT imaging and contrast agents for MRI (magnetic resonance imaging apparatus), requires high pressure, is difficult to manually operate, and the injection work is very cumbersome. Therefore, mechanical injection actuators, such as automatic injection devices, are commonly used to perform injections. Fig. 13 shows the syringe 20 mounted on such an automatic injection device 10. The automatic injection device 10 includes a barrel holder 11, a plunger holder 12, and an internal motor (not shown), the barrel holder 11 holding a syringe barrel 21 by a holding flange 22, the plunger holder 12 holding a plunger flange 24. The plunger 23 is moved relative to the syringe barrel 21 by motor advancement or retraction of the plunger holder 12 to effect injection (discharge of fluid from the syringe) and aspiration of fluid. Fig. 14 shows syringe barrel 20 mounted on automatic injection device 10.

Further, as shown in fig. 15, when a syringe of a smaller size is mounted on the automatic injection device, the syringe tube 21 is mounted on the detachable adapter 13 (functioning as a syringe cylinder holder), and the adapter 13 is further mounted on the automatic injection device 10. Fig. 16 shows the syringe 20 mounted on the automatic injection device 10.

Fig. 18 shows a detailed view of the adaptor 13 ((a) is a plan view and (b) is a rear view). Syringe barrel 21 may be held by fitting flange 22 of syringe barrel 21 into flange insertion slot 14 of adapter 13. As shown in fig. 17(a), the flange 22 is installed in the flange groove 14 while keeping the flange cut portion 25 vertically oriented. The flanges are then fixed by rotation through 90 so that they cannot be separated. Fig. 17(b) is a view showing a rotation process, and fig. 17(c) is a view showing a use position.

In the operating position, the arc of the flange is engaged with the arc of the flange insertion slot so as not to slip out in the upward direction. However, in order to prevent the slipping-out, it is necessary to secure a certain arc length of the flange insertion groove, and thus not to increase the opening length of the flange insertion groove. When the syringe is mounted, if the opening length L' and the length of the flange cut portion W cannot be increased as shown in fig. 17(a), the mounting operation takes time and labor.

In addition, the flange thickness and flange insertion slot width are designed to create a slight gap between the flange and the flange slot to facilitate smooth installation of the syringe barrel. The reason for this is that since the syringe barrel and the cylinder holder (including the adapter) are usually made of different materials, if the clearance is designed to be zero, the mounting cannot be performed in consideration of a range of manufacturing errors. Therefore, it is inevitable to generate a slight offset and play in the mounted state. However, if there is no error in the mounting process, the syringe sometimes rises from the vertical position. If the contrast medium and the chemical solution are to be injected instead at the time of mounting with such a slight clearance, the plunger will be pushed in a state where the flange 22 is inclined with respect to the flange insertion groove 14 as shown in fig. 19, and all the pressure is concentrated on only a part of the flange, and in the worst case, there will be a result that the flange is broken from the base.

Disclosure of Invention

The present invention is designed to solve the above problems, and an object of the present invention is to provide a syringe tube and a cylinder holder, in which a syringe is not easily damaged and is easily mounted when a high-viscosity liquid is injected at high pressure.

One aspect of the present invention is to provide a syringe barrel including a guide projection on a forward face of a flange.

The syringe barrel further comprises: a pressing projection provided on the rear face of the flange; when the flange is inserted into a flange insertion groove formed in the cylinder holder and held at the use position, the top of a pressing projection can be compressed to press the flange against the front side of the flange insertion groove.

In another aspect of the present invention, there is provided a barrel holder for holding a syringe barrel having a flange, the syringe barrel including a guide projection on a front face of the flange, the barrel holder comprising: a flange insertion groove for clamping a flange of a syringe barrel, and a guide groove provided on a front side surface of the flange insertion groove, the guide groove being capable of guiding a guide projection provided on a front surface of the flange of the syringe barrel.

In the present invention, the guide projection is preferably arc-shaped. And the guide groove is also preferably curved. "arcuate" generally means that a portion of at least one outer shape line is a portion of a circular arc. In a preferred embodiment, the portions of the two mutually opposite lines are portions of concentric circles. These examples are illustrated by the embodiments shown.

The combination of the syringe barrel and the cylinder holder may be used in a chemical solution injection system.

The syringe barrel described above may be used in combination with a syringe plunger as a pre-filled syringe filled with a chemical solution. The chemical solution may include a contrast agent.

In the present invention, the term "cylinder holder" means a member that can hold a syringe barrel through a groove, and when the syringe barrel is mounted on an adapter before being set in an injection device, the configuration of the term "cylinder holder" includes such an adapter. The cylinder holder is typically incorporated in or integrated with the automatic injection device.

Drawings

Fig. 1 shows a state in which a syringe tube is mounted in a cylinder holder.

Fig. 2 shows the adapter (cylinder holder) in which (a) is a plan view seen from the syringe mounting direction and (b) is a side cross-sectional view in which (a) is a cross-sectional view along a-a seen from the rear.

FIG. 3 is a cross-sectional view of the flange insertion slot of the adapter.

FIG. 4 is a side view of the flanged face of the syringe barrel as seen from the front side, where

(a) A front view (full view) showing the flange, an

(b) An enlarged view of part B in (a) is shown.

FIG. 5 is a cross-sectional view of the syringe, wherein

(a) Showing the cross-section F-F of figures 4 and 11,

(b) the cross-section C-C of figure 4 and the cross-section E-E of figure 11 are shown.

FIG. 6 is a schematic view showing a state where the syringe is mounted on the adapter, in which

(a) Shows a pre-installation state, an

(b) Showing the post-installation state with the portion rotated to the secured position.

FIG. 7 shows a comparison of the opening length of the adapter of the present invention with the conventional opening length, wherein

(a) Shows an adapter of the invention, and

(b) a generic adapter is shown.

FIG. 8 shows an embodiment of the syringe of the present invention, wherein

(a) Is a side view of the syringe, an

(b) Is a rear view of the flange from the rear side of the syringe.

Fig. 9(a) and (b) are examples of the pressing projection.

Fig. 10 shows a state where the flange is inserted into the flange insertion groove and fixed.

FIG. 11 is a front side view of a flange face showing another embodiment of a syringe barrel wherein

(a) Is a front view (full view) of the flange, an

(b) Is an enlarged view of section D of (a).

Fig. 12 shows another embodiment of the adapter (corresponding to cross section a-a in fig. 2).

Fig. 13 shows the syringe mounted on the automatic injection device.

Fig. 14 shows the syringe mounted on the automatic injection device.

Fig. 15 shows the syringe mounted on the automatic injection device using the adapter.

Fig. 16 shows the syringe mounted on the automatic injection device.

Fig. 17 is a schematic view of the syringe being held and in place by the cylinder holder (adapter) of the automatic injection device of fig. 3 and 5.

Fig. 18 is an enlarged view of the adapter.

Fig. 19 is a schematic view showing a state in which the flange of the syringe barrel is moved to float by the cylinder holder.

Description of reference numerals:

10 automatic injection device

11 cylindrical support

12 piston support

13 adapter

14 flange insertion groove

21 syringe tube

22 flange

23 piston

24 piston flange

25 flange cut-off part

31 syringe tube

32 Flange

33. 33a, 33b guide projection

34. 34a to 34d guide projection

40 adapter

41 guide groove

42 guide groove

51 push projection

52 stiffening ribs

52a stiffening rib radial

52b reinforcement rib concentric portion

Detailed Description

Fig. 1 shows a state in which the flange 32 of the syringe barrel 31 is fitted in the flange insertion groove 14 of the adapter 40 (cylinder holder). Fig. 2 shows an adapter 40, in which fig. 2(a) is a plan view seen from the syringe barrel mounting direction, and fig. 2(b) is a side cross-sectional view taken along a-a cross-section seen from the rear side of fig. 2 (a).

Fig. 3 is an enlarged cross-sectional view of a portion of the flange insertion groove 14. The guide groove 41 is curved and is located on the front side of the flange insertion groove 14 provided in the adapter.

Fig. 4 shows the syringe barrel flange used with the adapter as seen from the upper side of the syringe ((a) is a full view of the front and (B) is an enlarged view of part B of (a)). As can be seen in the figure, the front face of the flange 32 has arcuate guide projections 33(33a, 33 b). The cross-section F-F of FIG. 4 is shown in FIG. 5(a) and the cross-section C-C is shown in FIG. 5 (b). As shown in the cross-sectional view of fig. 5(a), the guide projection 33 of the present embodiment has a cross-sectional shape and an arc shape in the length direction adapted to the guide groove 41 of the adapter, and is adapted to rotate along the guide groove 41 of the adapter. Preferably, the end of the guide projection in the longitudinal direction is tapered as shown in fig. 5(b) to provide smooth guiding in the guide groove.

FIG. 6 is a cross-sectional view of the flange insertion slot from the rear side showing the mounting of the syringe on the adapter. First, as shown in fig. 6(a), the flange 32 is inserted into the flange insertion groove 14 while keeping the flange cut part 25 substantially vertical. Therefore, as shown in fig. 6(b), the guide projection 33 rotates while being fitted in the guide groove 41 until it reaches the use position.

Referring to fig. 7, the opening length of the flange groove is explained. FIG. 7(b) is a generic adapter; since it has no guide slot, the arcuate portion of the slot needs to be enlarged to prevent the flange from sliding upward. For this reason, the opening L' can be only slightly larger than the flange length in the flange cut-off direction W (see fig. 17). In addition, since the adapter of the present invention shown in fig. 7(a) can prevent the upward sliding out of the following guide groove 41, the arc-shaped portion of the groove is shortened. As a result, the opening length L can be enlarged and thus the syringe can be easily mounted. Naturally, the adapter of the present invention may be arranged so that the arcuate portion of the flange insertion groove is as long as the arcuate portion of the conventional type, in order to more securely and reliably prevent the syringe from slipping out. However, for general purposes, it is preferable to extend the length of the opening, giving priority to ease of handling and workability.

There is no particular limitation on the cross-sectional shapes of the guide projection and the adapter guide groove as long as they are easy to install each other and the syringe does not slide upward. In the case of the trapezoidal cross section shown in FIG. 5(a), for example, the structure is such that the height h is 1 to 3mm, the lower surface width t1 is 1 to 3mm, and the upper surface width t2 is 0.5 to 2.5 mm. The guide groove may be formed in this shape. Also, the dimension of the guide projection in the longitudinal direction (circumferential direction) may be generally smaller than the opening length of the flange insertion groove while remaining within a range effective to prevent upward floating when the syringe is mounted. For example, for a syringe barrel having an outer diameter of 30 to 40mm, the guide projection may have a dimension in the longitudinal direction of 20 to 120 degrees, preferably 30 to 90 degrees, with the center of the syringe barrel as an angular center.

Although the cross section is trapezoidal in this embodiment, it may be square, triangular, or the like.

Preferably, in the present invention, the flange has a pressing projection on a rear surface thereof. Also in the present invention, by providing a reinforcing rib on the rear face of the flange, the flange is further prevented from being damaged.

Fig. 8 shows an example of the flange 32 having the pushing projection 51 and the reinforcing rib 52. When the flange is mounted at the use position by inserting the flange into the flange insertion groove, the top of the push projection is pressed to generate an elastic force to push the flange forward, thereby firmly fixing the flange. As shown in fig. 9(a), the pressing projection 51 preferably has a narrow width toward the top to be more easily deformed by pressing. The outer cylinder of the syringe is typically constructed of a resin such as polypropylene and the adapter is constructed of ABS, polycarbonate or the like. Depending on the material selected, the cylinder holder sides can be arranged to be compressible. When using the above materials, the bulge of the syringe barrel is compressed. At this time, although the convex top portion is plastically deformed by compression, the flange is firmly fixed by the elastic force because a certain degree of compression force is retained.

The shape and height of the protrusions may be determined according to these materials. Generally, it is preferred that the distance from the front face of the flange to the pushing projection is about 0.1 to about 2.5mm, preferably about 0.2 to about 1.0mm, greater than the width of the flange insertion groove. The pressing projection may have a conical shape as shown in fig. 9 (b).

Fig. 10 shows the flange 32 installed in the flange groove. The pressing projection 51 is deformed, whereby the flange 32 is pressed against the front of the flange groove 14. The position where the pressing projection 51 is provided is preferably a position near the rear side of the guide projection formed on the front face of the flange as shown in fig. 8.

The shape of the reinforcing rib is not particularly limited, and may include a combined shape of the concentric portion 52b and the radial portion 52a as shown in fig. 8. In this embodiment, since the pressing projection 51 is formed on the extended portion of the radial portion, the radial portion is deformed accordingly. The pressing projection may be provided elsewhere.

Other embodiments of the guide projection are given below.

In the example shown in fig. 11, the guide projection 34 is formed in four places, which is shorter than the guide projection shown in fig. 4. As shown in the enlarged view of fig. 11(b), the end-to-end distance including the adjacent two guide projections 34a and 34b is preferably set to be the same as the length of the guide projection 33 in the longitudinal direction, as shown in fig. 4. The cross-sectional view E-E is the same as that shown in fig. 5, and the structure may be the same as that of the example of the guide projection in fig. 4. In fig. 11, the pressing projection and the reinforcing rib are shown to be formed on the rear surface.

The guide projection may have a plurality of truncated cones placed on a line in the circumferential direction; thus, a plurality of truncated cones may be provided at positions having the guide projections of fig. 4.

As described above, in the preferred embodiment of the present invention, the number of the arc-shaped guide projections may be an even number, and half the number is located at a symmetrical position on the flange without the two-flange cutoff portion.

Although in the above-described example, the guide projections are formed on each side of the flange cut-off portion (upper and lower portions in fig. 4 and 11), the guide projections may be formed only on one side. The adapter guide groove used in combination with the guide projection is opened at the upper portion like the guide groove 41 shown in fig. 2 or closed like the guide groove 42 shown in fig. 12. When the upper part is closed, the flange can be inserted into the adapter keeping its guide projection down and then be rotated until the use position is reached.

The above-described embodiment is an example of the present invention, and it should be noted that various changes may be made without departing from the scope of the present invention.

As described above, according to the present invention, a syringe barrel can be provided with a cylinder holder, so that the syringe is not easily damaged when injecting a high-speed liquid at a high pressure and is easily mounted.

Claims (18)

1. A syringe barrel for an injection device with a cylindrical holder, wherein:

the syringe tube has:

a body fittingly disposed on the cylinder holder,

a front end as a dispensing end of a syringe barrel and a rear end opposite the dispensing end, an

A flange extending outwardly from the body proximate the rear end;

and

the cylinder holder has a flange insertion slot for receiving a syringe tube;

the method is characterized in that:

the syringe barrel has a guide projection extending outwardly from a front face of the flange toward the dispensing end, whereby the guide projection engages with a guide groove formed on a front side of the insertion groove of the flange when the syringe barrel is fitted in the cylinder holder.

2. The syringe barrel of claim 1, wherein the guide projection is arcuate.

3. The syringe barrel of claim 1, wherein the flange has two flange cutouts symmetrically disposed at flange edges opposite to each other.

4. The syringe barrel according to claim 2, wherein at least one pair of guide projections of circular arc shape are provided such that two guide projections of each pair of guide projections are provided symmetrically to each other on the flange where there are no two flange cutouts.

5. The syringe barrel according to claim 1, wherein the guide projection is a plurality of guide portions aligned on a line in a circumferential direction on the flange front surface.

6. The syringe barrel of claim 5, wherein the flange has two flange cutouts symmetrically disposed at flange edges opposite to each other.

7. The syringe barrel according to claim 6, wherein at least one pair of guide projections having a frustoconical shape is provided such that the two guide projections of each pair are disposed symmetrically to each other on the flange where there are no two flange cutouts.

8. The syringe barrel according to any of claims 1-7, further comprising:

a pressing projection provided on the rear surface of the flange;

and a top portion of the pressing projection which is capable of being compressed to press the flange toward a front side surface of the flange insertion groove when the flange is inserted into the flange insertion groove formed in the cylinder holder and held at the use position.

9. A cylinder holder for holding a syringe barrel according to any one of claims 1 to 7, the cylinder holder comprising:

a flange insertion groove for holding a flange of a syringe barrel, and

a guide groove provided on a front side surface of the flange insertion groove; the guide groove can guide a guide projection provided on a front surface of a flange of the syringe tube.

10. A cylinder holder for holding a syringe barrel according to claim 8, the cylinder holder comprising:

a flange insertion groove for holding a flange of a syringe barrel, and

a guide groove provided on a front side surface of the flange insertion groove; the guide groove can guide a guide projection provided on a front surface of a flange of the syringe tube.

11. The cylinder stand of claim 9 wherein the guide slot is arcuate.

12. The cylinder stand of claim 10 wherein the guide slot is arcuate.

13. A chemical solution injection system comprising:

(a) the syringe barrel of any of claims 1-7; and

(b) the cylinder stand of claim 9;

thereby preventing the syringe barrel from slipping off the cylinder holder.

14. A chemical solution injection system comprising:

(a) the syringe barrel of claim 8; and

(b) the cylinder stand of claim 11;

thereby preventing the syringe barrel from slipping off the cylinder holder.

15. A pre-filled syringe comprising:

a syringe having a syringe barrel according to any of claims 1-7, and

a chemical solution filled in the syringe barrel.

16. A pre-filled syringe comprising:

a syringe having the syringe barrel of claim 8, and

a chemical solution filled in the syringe barrel.

17. The pre-filled syringe of claim 15, wherein the chemical solution comprises a contrast agent.

18. The pre-filled syringe of claim 16, wherein the chemical solution comprises a contrast agent.