JP3034694U - IV injection device - Google Patents

Abstract

(57) An object of the present invention is to provide a device for drip injection which prevents backflow of blood. A needle tube 6, a non-return tube 7 and a connecting tube 8 are formed. Non-return tube 7
Is a closed, tapered tube integrally formed of soft rubber and having a thickness at its end, the upper end of which is extended to a flange 71 having a larger diameter.
When the distal end 72 of the non-return tube 7 is cut longitudinally from top to bottom, a suitable tear hole is formed extending into the tube hole 73. When performing an intravenous drip injection under the same atmospheric pressure, the liquid pressure in the drip bottle is higher than the blood pressure. Therefore, if the drip liquid is introduced into the tube hole 73, it is possible to open a broken hole and put it in the needle tube 6. is there. When the drip solution is used up, the fluid pressure is lowered to a level smaller than that of blood, and the hole torn is automatically closed by the action force of the wall pressure and the fluid pressure, so that the transmission from the drip connection tube 8 is prevented. , Help the effect of making a safe injection.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a drip injection device.

[0002]

[Prior art]

 Traditionally, infusion devices provide nutrition through a drip bottle or are mixed with another drug and then infused into the patient's body with a device that includes parts such as needles, transport tubes, flow controllers, and injection needles. Is. Due to its simple structure and low cost, all sets must be unplugged and discarded or discarded after use once in order to ensure the safety of the injection.

A drip injection device can sustain an injection when the pressure of the injection liquid is higher than the vascular pressure of the patient. Conversely, if the drug volume is too low or the drip bottle is hung too low, the increasing vascular pressure will always cause blood to flow back into the delivery tube. Such a blood reflux phenomenon is not dangerous, but when a general patient sees blood stains in a blood transfusion vessel, he is in a state of depression and anxiety, which is a problem for medical treatment.

To solve such a phenomenon, the market has a device for adding a one-way active valve piece in the central part of an infusion tube. Hereinafter, a description will be given with reference to FIG. Its main structure includes the following parts: The non-return seat 2 connects the joint 21 and the hollow hemisphere 22 and joins the convex ring 221 and the circular valve piece 222 at the inner end of the sphere 22 and is attached to the needle tube 4 and positioned by the joint 21.

The partition isolation seat 3 also connects the joint 31 and the hollow hemisphere 32, and the age of the sphere 32 is provided with a septum plate 33 in which a through hole 331 is machined in the middle. Installs a convex ring 332. The convex ring 332 is fitted into the convex ring 221 of the non-return seat 2 and adhered thereto, and then molded. It should be noted that the joint 31 is connected to the connecting tube 5 of the drip bottle.

With the above parts, the needle tube 4 is connected to the connecting tube 5 via the non-return seat 2 and the partition isolation seat 3. Due to the rotation biasing action of the valve piece 222 in the check seat 2, the drip fluid flows in the passage in only one direction of the injection, so that the septal plate 33 immediately passes through the septum 33 at the moment when the liquid medicine returns or the blood flows backward. This helps to close the hole 331 and prevent the backflow phenomenon.

[0007]

[Problems to be solved by the device]

 However, such a structure has the following drawbacks. Molding is difficult. At the inner ends of the check seat 2 and the partition isolation seat 3 in the hollow hemisphere, the valve ring 222 and the septum plate are vertically connected by the convex rings 221 and 332. Since the structure is complicated, not only is it difficult to manufacture a mold for molding, but the cost is relatively high. However, since there are differences in the thickness of the spherical wall, valve piece, septum, etc. during injection molding, phenomena such as non-uniformity and shrinkage deformation occur, making it difficult to mold appropriate and good parts. .

The chemical liquid spills out. Adhesion between the non-return seat 2 and the partition isolation seat utilizes the convex rings 221 and 332, and the adhesion range is narrow and small, so the strength becomes poor. Therefore, the medicinal liquid always seeps from the adhesive seam and is wasted. In severe cases, the loss of stickiness may separate the non-return seat from the compartment-separating seat, resulting in interruption of drug injection and massive leakage, as well as depression of the sick and family members. That is a big flaw.

Unstable drug solution transfer Since the valve piece 222 covers the through hole 331 of the septum plate 33 and the vertical force is too large, the pressure of blood and the valve piece are not enough for normal drug solution transfer. Must overcome the gravity of. After all, when the pressure inside the drip bottle is gradually reduced, the transportation of the drug solution becomes unstable and unsatisfactory, which is inconvenient for the user.

The main object of the present invention is to provide a device for infusion injection which prevents the backflow of blood.

[0011]

[Means for Solving the Problems]

 The structure forms an integrally molded tapered check tube. It has a closed structure with a thick end, and a thin knife cuts the non-return tube up to the tube hole in a vertically inclined manner to form a normally closed tear hole. To do. Then, due to the pressure difference between the liquid medicine and blood, there is no possibility that the split hole will flow only one way (that is, in the injection direction of the liquid medicine), the liquid medicine will return, or the blood will regurgitate. In particular, it has practical effects such as molding economy, injection safety, and stable and smooth drug solution transportation.

The check tube is provided with a concave arc-shaped wire ring near the flange. Since the liquid stop line is projected and placed on the surface of the annular rib on the inner wall of the needle tube, when the check tube is put in the needle tube and the flange is positioned by the annular rib, There is a line loop, and the liquid-stopping line is well bonded closely to improve the effect of preventing leakage of chemical liquid transport.

Further, when only the non-return tube is added, the action of preventing the backflow of blood can be exerted. The integral molding method simplifies the parts of the structure, and at the same time, because of the elasticity of the rubber, it also has a tightening connection action, so there is no need for adhesive processing, and there is an economic benefit of molding.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, referring to FIGS. 1 and 2, the present invention is mainly formed of elements such as a needle tube 6, a check tube 7 and a connecting tube 8. On the other hand, the needle tube 6 is connected from the needle head 61 and the soft tube 62. The soft tube 62 is provided with an annulus 621 projecting along the inner wall towards the end.

The non-return tube 7 is a closed rubber taper tube which is integrally formed of soft rubber and has a thickness at its end, and a flange having a larger diameter with its upper end extended. 71. A thin knife is used to cut the end 72 of the non-return tube 7 from top to bottom in a longitudinal slope to form a suitable tear hole 721 extending to the tube hole 73.

The connecting tube 8 is extended from a thin and long tube to form a joint 81 having a larger diameter. Then, the non-return tube 7 is fitted from one end of the soft tube 62, and the flange 71 is stopped to the outside of the annular rib 621. It should be noted that when the soft tube 62 is connected to the joint 81 of the connection tube 8 of the drip bottle so that the same end is tightened, the edge of the joint 81 is good and the non-return tube 7 is stretched well, so slide outward. To prevent (as in the assembly diagram shown in Figure 2).

Further, the check tube 7 is provided with a concave arc-shaped wire ring 74 near the flange 71. On the surface of the annular rib 621 on the inner wall of the needle tube 6, the liquid stop line 63 is projected and arranged, so that the check tube 7 is inserted into the needle tube 6 and the flange is positioned by the annular rib 621. At this time, the above-mentioned wire ring 74 is provided so that the liquid stop line 63 is closely adhered and the effect of preventing leakage of the chemical liquid transport is improved.

Referring to FIG. 3, under normal pressure conditions, a thin split hole 721 at the distal end 72 of the non-return tube 7 is compressed by the thickness of the tube wall to become a closed state, but a drip injection is performed. In this case, since the liquid pressure in the drip bottle 9 is higher than the blood pressure, when the drip liquid W is guided to the tube and the hole 73 via the connecting tube 8, it is possible to open a torn hole and put it in the needle tube 2. It is possible. When the drip solution W is used up, the fluid pressure is lowered to a level smaller than the blood pressure, and the design of the hole that has been cut like an inclination is used, and the wall pressure and the fluid pressure are reduced at the moment when the liquid medicine returns or regurgitates. Since the torn hole 721 is automatically closed by the action force P of, there is a safe injection effect of preventing infection from the drip connection tube.

[Brief description of the drawings]

FIG. 1 is a three-dimensional exploded view of the structure of the present invention.

FIG. 2 is a combined sectional view of the structure of the present invention.

FIG. 3 is a view showing a state in which a split hole is opened when a drug solution is injected according to the present invention.

FIG. 4 is a cross-sectional explanatory view of a conventional structure.

[Explanation of symbols]

 6 Needle tube 7 Non-return tube 8 Connection tube 61 Needle head 62 Soft tube 71 Flange 72 End 73 Tube hole 81 Joint 1-A End of non-return tube 3-A Opening a torn hole

Claims (2)

[Utility model registration claims] 1. A non-return tube, a needle tube, and a connecting tube, wherein the non-return tube is integrally molded of soft rubber, and is a closed tapered tube whose end has a thickness, When the upper end is extended into a flange with a large diameter and a thin knife is used to cut the end of the non-return tube longitudinally from top to bottom, a suitably teared hole is formed extending to the tube, The soft tube of the needle tube is provided with an annular rib projecting along the inner wall near the distal end, and the check tube is fitted from one end of the soft tube so that the flange stops outside the annular rib, When connected to the fitting of the connecting tube of the drip bottle so that the same end of the tube is tightened, the edge of the fitting will taut the check tube. To prevent slipping out, and at the same atmospheric pressure, the thin tear hole at the end of the non-return tube is compressed by the thickness of the tube wall into a closed shape, and when the drip injection is performed, the liquid in the drip bottle is closed. The pressure is higher due to the blood pressure, and when the drip solution is guided to the tube hole, it is possible to open the torn hole and put it in the needle tube.When the drip solution is used up, the fluid pressure becomes smaller due to the blood pressure. Low yielding, utilizing the split hole design,
At the moment of return or backflow of the drug solution, the split hole is automatically closed by the action force of the wall pressure and the liquid pressure, the transmission of the drip from the connecting tube is prevented, and the safe injection can be sustained. A drip injection device characterized by the above. 2. The check tube is provided with a concave arc-shaped wire ring near the flange, and a liquid stop line is arranged so as to project on the surface of the annular rib on the inner wall of the needle tube. , When the non-return tube is put in a needle tube and a flange is positioned by the annular rib, the wire ring is closely joined to a liquid stop line to prevent leakage of liquid chemical transport. The infusion injection device according to 1.