JP2003116994A - Syringe for thrombus prevention treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a syringe with which the safety of a patient is secured and thrombus prevention treatment can be carried out without imposing stress and mental burden to an operator. SOLUTION: In the syringe 10 for the thrombus prevention treatment, the rear end of a holder 15 is extended backward from the rear end of a cylinder 12 and the rear end of the holder 15 is pushed by a flange 13 of the pushed-in plunger 14 (1). A thrust 16b is extended from the flange 13 of the plunger 14 to the holder 15 and the rear end of the holder 15 is pushed by this thrust 16b (2). A thrust rod 16c is extended from the flange 13 of the plunger 14 to the holder 15, a groove 19 is provided in the axial direction of the holder 15, the thrust rod 16c is fitted into this groove 19, and a dead end 19t of the groove 19 is pushed by the top end of the thrust rod 16c (3).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a means for preventing thrombus from occurring in an infusion needle to be indwelled when intermittently collecting blood or when infusion is suspended for a certain period of time, for example, thrombus prevention treatment.

[0002]

2. Description of the Related Art When infusion is continuously performed for a long time,
The patient's movements are restrained and painful, and infusion may be temporarily interrupted to alleviate this.
In addition, there is a case where blood is intermittently collected as one of the examinations.

When the infusion is temporarily interrupted or blood is intermittently collected as described above, a heparin solution diluted with physiological saline in the needle is used so that a thrombus cannot be formed in the injecting / collecting needle to be indwelled, or There is a medical technique for filling physiological saline.

To explain this thrombosis preventing procedure in more detail, when the infusion is temporarily interrupted, the catheter connected to the infusion needle (blood collection needle) is removed from the needle, and 1 to 1000 units of heparin per 1 ml of physiological saline. Solution 5-10
flush (ml) with a syringe to expel blood remaining in the needle and fill it with heparin solution, remove the syringe from the needle and plug, or keep the heparin solution filled with an active three-way valve I am trying.

When the blood sampling interval is short, or when the infusion suspension time is short, thrombosis can be prevented with only physiological saline.

[0006]

In the above thrombus-preventing treatment, when the syringe is removed from the needle, it must be removed while maintaining a positive pressure state. The reason is that when the pressure is lower than the blood pressure, the blood flows back into the needle and causes a thrombus.

[0007] The operation of removing the syringe from the needle while maintaining the positive pressure state as described above requires skill and
Since it is related to human life, the practitioner will be strained and mentally burdened.

In view of the above situation, the present invention intends to provide a syringe which can ensure the safety of the patient and can perform the thrombosis prevention treatment without straining or practicing the operator.

[0009]

In order to solve the above problems, the present invention provides a syringe comprising a plunger / cylinder and a holder slidably arranged on the outer periphery of the cylinder, wherein the holder comprises: With the addition of the function to disconnect the connecting member from the discharge cylinder of the cylinder from the end of the plunger's pushing stroke.
The front end of the holder comes into contact with or fits into the discharge cylinder, and the plunger is pushed in so that the holder moves forward relative to the cylinder. The holder starts to move forward when the remaining amount of the liquid medicine in the cylinder is 0.2 to 1 ml. If necessary, the syringe can be filled with 5 to 10 ml in advance.

As a mechanism for moving the holder relative to the cylinder, the rear end of the holder extends rearward from the rear end of the cylinder so that the flange of the plunger to be pushed pushes the rear end of the holder. The plunger extends from the flange of the plunger toward the holder, and the protrusion pushes the rear end of the holder.The plunger extends from the flange of the plunger toward the holder and the axial direction of the holder. Groove on the
The thrust bar may be inserted into the groove so that the tip of the thrust bar pushes the end of the groove.

According to the present invention constructed as described above, at the end of the pushing stroke of the plunger, the holder advances (slides) and the connecting member put on the discharge cylinder is pushed out and released. Therefore, the needle can be removed while maintaining the positive pressure state, and blood does not flow backward and there is no risk of causing thrombus.

As another means for solving the problem, there is provided means for absorbing a pushing pressure into a plunger including a flange of a syringe composed of a plunger and a cylinder and releasing the absorbed pushing pressure at the end of the pushing stroke. It is also possible to have an attached structure. It should be noted that the absorbed pushing pressure is released when the remaining amount of the chemical liquid in the cylinder is 0.2.
Start at ~ 1 ml. If necessary, the syringe can be filled with 5 to 10 ml in advance.

According to the present invention configured as described above, when the pushing operation is stopped at the end of the pushing stroke of the plunger, the absorbed pushing pressure is released and the plunger advances to maintain the positive pressure state. It is possible to remove the connecting member covering the discharge tube.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. In the first embodiment, a holder 15 is axially slidably mounted on the outer circumference of a syringe 10, which is composed of a cylinder 12 having a liquid medicine discharge tube 11 at its front end and a plunger 14 having a flange 13 at its rear end. It is fitted.

Holder 15 of the first embodiment (FIGS. 1 and 2)
Is integrally provided with a protruding piece 16a extending rearward from the rear end of the cylinder 12, and when the plunger 14 is pushed in to reach the end of the stroke, the flange 13 of the plunger 14 abuts against the protruding piece 16a and pushes it. It is like this.

When the flange 13 of the plunger 14 abuts the protruding piece 16a and starts pushing the holder 15, the holder 15 slides along the surface of the cylinder 12 in the axial direction, and the front end of the holder 15 moves to the discharge tube 11. The covered connection cylinder 17 (connection cylinder of the injection needle) is pushed out so as to be released, and the injection needle 18 is removed from the injector 10 while maintaining the positive pressure state.

The second embodiment (FIG. 3) has a plunger 14
16b from the flange 13 toward the holder 15
When the plunger 14 is pushed in and the end of the stroke is reached, the protruding piece 16b abuts the rear end of the holder 15 and pushes the holder 15.

When the protruding piece 16b begins to push the holder 15, the holder 15 slides axially along the surface of the cylinder 12, and the front end of the holder 15 is connected to the discharge tube 11 by a connecting tube 17 (injection needle The syringe 1 will be pushed out so that the connecting tube) is released, and the syringe 1
The injection needle 18 is removed from 0.

The third embodiment (FIG. 4) has a plunger 14
16d from the flange 13 to the holder 15
And the holder 15 is provided with a groove 19 in the axial direction,
The thrust rod 16c is inserted into this groove 19 and the plunger 1
At the end of the fourth stroke, the end 19t of the groove 19 is pushed by the tip of the thrust rod 16c.

The tip of the thrust rod 16c is the end 19t of the groove 19.
When you start pressing, the holder 15 slides along the surface of the cylinder 12 in the axial direction, and the front end of the holder 15 is at the discharge tube 1.
The connection cylinder 17 (connection cylinder of the injection needle) covered with 1 is pushed out so as to be released, and the injection needle 18 is removed from the injector 10 while maintaining the positive pressure state.

In the above first to third embodiments,
The remaining amount of the chemical solution in the cylinder 12 when the protruding piece 16a, the protruding piece 16b, and the protruding rod 16c contact the holder 15 is 0.2 to 1 ml. When the amount is too small, it is difficult to operate the positive pressure. Intermittent blood sampling requires only a small residual amount, and transfusion requires a large amount because a catheter intervenes.

In the second embodiment (FIG. 5), the plunger 1 is used.
The flange 13 provided at the rear end of the plunger 14 of the syringe 10 composed of the four-cylinder 12 is the main flange 13
It has a two-layer structure in which a is covered with a movable flange 13b, and a coil spring S is inserted between the main flange 13a and the movable flange 13b.

A slit X is cut in the hem of the movable flange 13b to form a bending portion Y, and a hook Z1 is formed at the end of the bending portion Y.

On the other hand, the flange 12 at the rear end of the cylinder 12
At f, the hook Z is placed at a position corresponding to the hook Z1 of the flexible portion Y.
Two are formed so that they can be hooked together.

In this embodiment, when the plunger 14 is pushed in, the coil spring S in the double-layered flange 13 bends to absorb the pushing pressure. Further, when the plunger 14 is pushed in and the end of the stroke is reached, the hook Z1 is pressed.
, Z2 are caught by each other and locked.

When locked, the pushing pressure absorbed by the coil spring S is released, during which the injection needle 18 is removed from the discharge tube 11. Therefore, the injection needle 18 can be removed from the injector 10 while maintaining the positive pressure state.

In the above embodiment, the flange 13 of the plunger 14 and the cylinder 12 are locked by the hooks Z1 and Z2, but when this mechanism is not provided and the flange and the rear end of the cylinder are brought into contact with each other. , It is also possible to leave the stroke of the plunger.

With this configuration, when the flange and the rear end of the cylinder come into contact with each other, the absorbed pushing pressure is released and the plunger is pushed in. Therefore, if the needle is removed from the syringe during this time, a positive pressure state is obtained. Can be removed.

In the above embodiment, the flange has a two-layer structure and the coil spring is inserted between them. However, instead of the spring, an elastic body such as a sponge or an air ball may be inserted, and the flange has two layers. Plunger has a double structure instead of a layered structure, in which springs, sponges, air balls, etc. are interposed to absorb the pushing pressure.
It can also be a discharging means.

A spring, sponge, air ball or the like is selected so that the amount of the chemical liquid pushed out by the release of the pushing pressure is 0.2 to 1 ml.

Further, if the above syringe is filled with 5 to 10 ml of a heparin / physiological saline diluting solution or physiological saline in advance and is packaged in a sterilized state, workability is further improved.

When the infusion is interrupted, the three-way stopcock 21 shown in FIG. 6 can be used. In the figure (a), the stopper 23 is inserted into the syringe mounting portion 22 while the infusion is in progress, and the catheter 24 Is in communication with the patient side from the tank, (b) is a state where the heparin / saline diluting solution is flushed, and the syringe 20 is inserted so that the heparin diluting solution can be flushed, and (c) is the patient side. The catheter is completely closed and the syringe mount 22 has a stopper 2
3 is inserted and the infusion is suspended.

[0033]

As described above, according to the present invention,
A procedure (heparin lock) to prevent thrombus from occurring in the injection needle that is placed during infusion interruption or intermittent blood sampling.
It will be surely performed under positive pressure, the skill and mental burden of the practitioner will be reduced, and the safety of the patient will be secured.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment (during injection).

FIG. 2 is a perspective view of the first embodiment (during removal of the positive pressure maintaining needle).

FIG. 3A is a cross-sectional view showing the second embodiment during injection, and FIG. 3B during removal of the positive pressure maintaining needle.

FIG. 4 is a perspective view of a third embodiment.

5A is a sectional view of a second embodiment, FIG. 5B is an enlarged view of a flange portion, and FIG. 5C is an enlarged sectional view of a hook portion.

FIG. 6 is a cross-sectional view showing (a) infusion of a three-way stopcock, (b) flushing of heparin diluent, and (c) suspension of infusion.

[Explanation of symbols]

11 discharge tube 12 cylinders 12f Tsuba (of cylinder) 13 flange 13a Main flange 13b Movable flange 14 Plunger 15 holder 16a protruding piece 16b slug 16c cue stick 16t tip (of stick) 17 Connection tube 18 injection needle 19 groove 19t end (of groove) S coil spring X slit Y flexible part Z1 and Z2 hooks

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Keiichi Kawakami             21-21 Nishinosu, Taihama, Kitajima-cho, Itano-gun, Tokushima Prefecture (72) Inventor Fujio Inoue             41, 240 Odai, Otsu Town, Naruto City, Tokushima Prefecture F-term (reference) 4C038 TA03 UF02 UF20                 4C066 AA07 BB01 CC01 DD08 EE14                       FF05 GG01 GG11 GG15 GG20                       HH12 LL21 QQ14 QQ48

Claims (9)

[Claims] 1. A syringe comprising a plunger / cylinder and a holder slidably arranged on the outer periphery of the cylinder, wherein the holder is put on the discharge tube of the cylinder from the end of the pushing stroke of the plunger. A thrombus-preventing treatment syringe characterized by having a function of detaching a connecting member. 2. The front end of the holder comes into contact with or fits into the discharge tube, and the holder is moved forward relative to the cylinder by pushing the plunger. The thrombus-preventing treatment syringe according to claim 1. 3. The thrombus according to claim 1, wherein the rear end of the holder extends rearward from the rear end of the cylinder, and the flange of the plunger to be pushed in pushes the rear end of the holder. Syringe for preventive measures. 4. A syringe for preventing thrombosis according to claim 1 or 2, wherein a projecting piece is extended from a flange of the plunger toward the holder, and the projecting piece pushes the rear end of the holder. . 5. A thrust rod extends from the flange of the plunger toward the holder, and a groove is provided in the axial direction of the holder.
The thrombus-preventing-treatment syringe according to claim 1 or 2, wherein the thrust rod is inserted into the groove, and the end of the groove is pushed by the tip of the thrust rod. 6. The remaining amount of the chemical liquid in the cylinder is 0.2 to 1.
The syringe for thrombosis prevention treatment according to any one of claims 1 to 5, wherein the holder starts sliding in the range of ml. 7. A syringe comprising a plunger and cylinder, wherein a plunger including a flange formed at a rear end is provided with means for absorbing the pushing pressure and releasing the absorbed pushing pressure at the end of the pushing stroke. An injector for preventing thrombosis, which is characterized by being attached. 8. The thrombus preventive treatment injector according to claim 7, wherein the amount of the drug solution extruded by the release of the absorbed pushing pressure is in the range of 0.2 to 1 ml. 9. The thrombus-preventing treatment syringe according to claim 1, wherein the syringe is previously filled with 5 to 10 ml of a heparin / physiological saline solution or a saline.