KR970008116B1 - Assembly composed of hard member - Google Patents

Abstract

No summary.

Description

Assembly consisting of medical soft tube and hard member

1 is a side view of an assembly composed of a hard member and a medical soft tube inserted on the hard member according to the first embodiment of the present invention in a disassembled state;

2 is an end view of the assembly shown axially in FIG.

3 is a partially exploded side view of the assembly of FIG.

4 is a side view of an assembly composed of a hard member and a medical flexible tube inserted on the hard member according to the second embodiment of the present invention in a disassembled state;

5 is a side view of an assembly composed of a hard member and a medical soft tube inserted on the hard member according to the third embodiment of the present invention in disassembled form;

6 is a side view of a conventional assembly consisting of a hard member and a medical soft tube inserted over the hard member, and

7 is a partially exploded side view of the conventional assembly of FIG.

* Explanation of symbols for main parts of the drawings

1: soft tube, 2: hard tube,

3: Insertion part, 4: Flange.

The present invention relates to an assembly consisting of a hard member and a medical soft tube inserted over the hard member.

More particularly, the present invention relates to the improvement of conventional assemblies used as an essential component of medical devices such as blood transfusion sets, agitation sets and the like.

Soft synthetic resins, that is, flexible tubes molded from a material such as polyvinyl chloride, have been used in a field such as a male set, a immersion set, and the like.

Each soft tube is used by connecting each soft member to other components in the shape of a hard member in a medical device, in particular to provide an assembly consisting of the hard member and the soft member.

When a flexible tube molded from a material such as soft polyvinyl chloride or the like is connected to a hard member made of a material such as polyethylene or polypropylene, a suitable adhesive for use in combination of a soft synthetic resin and a hard synthetic resin is currently available. Since it is not valid, a solid connection will achieve simple insertion by hand.

In practice, the inserting operation includes the steps of dimensioning the inner diameter of the soft tube slightly smaller than the outer diameter of the hard member, and the step of strongly inserting the soft tube over the insertion position of the hard member in the face of the contracting force and the friction force caused by the contraction of the soft tube. Physically by way of doing so.

Over time, a slight range of slack appears between the soft tube and the hard member.

This leads to a failure in which the soft tube is undesirably separated from the insertion position of the hard member due to the reduction in the clamping force generated therebetween.

In order to eliminate the above-mentioned problem, the inventors have experimentally observed the above-mentioned problem of separation.

As a result derived from the observation, it was found that separation occurs easily in the soft tube when the close area between the soft tube and the hard member is lost.

FIG. 6 is a side view of a typical assembly consisting of a hard member 2 and a soft tube 1 inserted over an insertion portion 3 of a medical hard member 2, and FIG. 7 is a partially exploded side view of the assembly of FIG.

When the constant strength of the distribution force is transferred to the soft tube inserted over the insertion portion of the hard member 2 under the influence of the reduced pressing force, the tip of the soft tube 1 remains in close contact with the side wall of the flange 4 and is soft. The diameter of the tip of the tube 1 is enlarged by the axial compressive force (see FIG. 7).

As a result, the tight region between the soft tube 1 and the hard member 2 is lost. If the soft tube 1 is pulled backwards small and at the same time maintained in this state, separation occurs easily in the soft tube 1 because there is no compressive force.

In particular, when the conventional assembly is heated during the sterilization process, separation of the soft tube 1 occurs remarkably.

In this problem mentioned above, this proposal was made such that the diameter of the insertion part 3 of the hard member 2 is further enlarged toward the flange so that the pressing force correspondingly increases.

In particular, the compressive force slightly increased but with this alternative a significant improvement failed to prevent separation from occurring in the soft tube 1.

In addition, another proposal is disclosed in Japanese Patent Laid-Open No. 283651/1988.

According to this conventional invention, the filtration lower cap of the agitation set is connected to a flexible tube with an improved structure for the purpose of overcoming the problem of undesired separation of the soft tube.

However, the improved structure is complex, so that the composite assembly consisting of the lower cap and the soft tube is made difficult.

In addition, this discloses that a member made of polyvinyl chloride is adhered to a member made of polyolefin by using an adhesive based on chlorided polyolefin.

However, once the hard member is covered with this adhesive, it is very difficult to insert the hard member into the soft member because of the increased frictional force.

Therefore, this proposal cannot be used in practice.

In general, in order to improve the conventional assembly consisting of a hard member and a medical soft tube inserted over the hard member in this manner, the inventors have found that a plurality of protrusions formed on the hard member are extremely effective to prevent separation from the soft member. Found.

In addition, the inventors have found that the particular shape used in the soft tube is likewise very effective for this purpose.

The present invention has been accomplished by the above background.

It is an object of the present invention to provide an assembly consisting of a hard member and a soft member inserted over a medical hard member wherein no problem of separation of the soft member from the hard member occurs in the assembly.

Another object of the present invention is to provide an assembly consisting of a hard member and a medical soft tube inserted over the hard member, wherein the assembly is easily manufactured at low cost.

In order to achieve the above object, there is provided an assembly composed of a hard tube and a soft tube inserted over a medical hard member in accordance with one aspect of the present invention, the hard member is formed of a hard synthetic resin and comprises a flange and the soft tube is soft It is formed of a synthetic resin, the flange is formed of a plurality of protrusions arranged along a common circumference in a spaced apart relationship, the protrusions, the soft tube is inserted over the insertion portion of the hard member so that the front surface of the soft tube is a flange of the soft member When in close contact with the side wall of the projection, it projects toward the flexible tube side in order to firmly hold the tip portion of the flexible tube between the protrusion and the insertion portion of the hard member in the clamped state.

Furthermore, according to another feature of the invention, there is provided an assembly consisting of a soft tube inserted into a hard member and a medical hard member, the hard member comprising an insert portion formed of hard synthetic resin and having a flange and a soft tube inserted therein, The soft tube is formed of soft synthetic resin, and part or all of the tip surface of the soft tube does not extend parallel to the side wall of the flange of the hard member.

In fact, the tip surface is cut at an angle to form a constant angle of inclination with respect to the central axis of the assembly.

The flexible tube may be formed of a plurality of cuts along the leading surface in spaced relation.

Each cut preferably forms a V-shaped curve that forms a constant opening angle symmetrically about the mid-axis of the assembly.

Other objects, features and advantages of the present invention will be described in detail below with reference to the accompanying drawings.

1 is a side view of an assembly of a hard member according to a first embodiment of the present invention in an exploded state and an assembly composed of a medical tube (hereinafter simply referred to as an assembly) inserted over the hard member.

2 is an end view of the assembly shown axially.

The assembly of the present invention is made of the same soft tube (1) molded of soft synthetic resin, for example, soft polyvinyl chloride, ethylene vinyl acetate copolymer and the like, and a hard synthetic material, for example, polyethylene polypropylene. It is composed of a molded hard member (2).

The hard member 2 has an insertion portion 3 such that the tip of the soft tube 1 is in close contact with the side wall of the flange 4 in the same manner as the conventional assembly described above with reference to FIGS. 6 and 7. And a flange (4).

According to the invention, the flange 4 is formed of a plurality of protrusions 5 (two protrusions are shown in the embodiment).

As is apparent from FIG. 3, when the soft tube 1 is inserted over the insertion portion 3 of the hard member 2, the tip of the soft tube 1 has more protrusions 5 than the conventional assembly. It cooperates and remains in close contact with the side wall of the flange 4.

In particular, as the strength of the pressing force is transmitted to the soft tube 1, the tip of the soft tube 1 is closely clamped between the insertion portion 3 and the protrusion 5 of the hard member 2, the soft tube ( 1) It causes a frictional contact state which prevents separation from the insertion portion of the hard member 2.

In the embodiment shown, the flange 4 is formed in two projections 5. However, the present invention is not only limited to this.

The number of protrusions 5 and the size of each protrusion 5 may be suitably determined as desired.

If a single protrusion is formed on the flange, the clamp force is greatly reduced. Therefore, it is preferable that the flange 4 is formed of at least two protrusions 5 arranged along a common circle in spaced relation.

4 is a side view showing the assembly composed of a hard member and a soft tube inserted over the hard member in the disassembled state according to the second embodiment of the present invention.

The same components as those in the first embodiment are denoted by the same reference numerals.

Therefore, repeated description will not be given.

In the second embodiment, the tip of the soft tube is cut at an angle.

In fact, the inclination of the tip of the flexible tube 1 and the central axis of the assembly forms an angle of α.

In contrast to the first embodiment, the flange 4 is not provided with any protrusion.

However, the insertion function of the assembly according to the second embodiment is substantially the same as that of the first embodiment of the present invention.

Indeed, as the soft tube 1 is inserted above the insertion portion 3 of the hard member 2, the tip of the soft tube 1 is inclined greatly along the side wall of the flange 4 and at the same time in close contact therewith. Will be.

Therefore, tight insertion is achieved in the soft tube 1.

5 is a side of the embodiment of the assembly consisting of a hard member and a flexible tube inserted on the hard member according to the third embodiment of the present invention.

The same components as in the first and second embodiments are likewise denoted by the same numbers.

In this embodiment, the tip of the soft tube 1 is cut into a V shape when viewed from the symmetrical side with respect to the central axis of the soft tube 1 and forms an open angle of β.

The insertion function induced in the third embodiment is completely the same as in the second embodiment.

Indeed, as the soft tube 1 is inserted above the insertion portion 3 of the hard member 2, the two forked ends of the soft tube 1 are inclined greatly along the side wall of the flange 4 and at the same time the opening angle. Zoom in on β.

Thus, increased liquid adhesion and insertion function are obtained in the assembly according to the third embodiment of the present invention.

In the illustrated embodiment, two V-shaped cuts are formed along the outer surface of the soft tube 1 at the tip of the soft tube.

Alternatively, three or more V-shaped cuts may be formed on the leading surface of the soft tube 1 in spaced relation.

In addition, the shape of each cut is not limited to the V shape. The number of cuts, the size of each cut, and the shape of each cut may be appropriately determined as desired.

A common fact about the second and third embodiments of the present invention is that some or all of the tip of the flexible tube 1 does not extend parallel to the side wall of the flange 4.

As will be apparent from the above description, the present invention has the advantageous effect that the assembly function is easily manufactured at low cost since the insertion function is reliably ensured.

While the invention has been described above with respect to three preferred embodiments, it is to be understood that the invention is not limited to these embodiments and that various changes or modifications can be made without departing from the invention as defined by the appended claims. will be.

Claims (5)

The hard member is formed of a hard synthetic resin and the flange and the soft tube includes an insertion portion, the soft tube is formed of a soft synthetic resin, the assembly consisting of the medical soft member inserted on the hard member and the hard member, the flange Is formed in a plurality of protrusions arranged along a common circle in a spaced apart relationship, wherein the protrusions are inserted into the insertion portion of the hard member so that the front end surface of the soft tube is in close contact with the side wall of the flange of the hard member. And when present, protrudes toward the flexible tube to securely hold the leading end of the flexible tube between the protrusion and the leading end of the hard member in the clamped state. The hard member includes an insert portion formed of a hard synthetic resin and inserted into a flange and a soft tube, wherein the soft tube is formed of a soft synthetic resin and is composed of a hard member and a medical soft member inserted on the hard member. At least part of the tip surface of the flexible tube does not extend parallel to the sidewall of the flange of the rigid member. 3. The assembly of claim 2, wherein the leading surface of the soft tube is cut at an angle to form a constant angle of inclination with respect to the central axis of the assembly. The assembly of claim 2, wherein the soft tube is formed of a plurality of cuts along the leading surface in spaced relation. 5. The assembly of claim 4, wherein each cutout forms a V-shape that defines a constant opening angle symmetrically about a central axis of the assembly.

Images