TWM519523U - Positive pressure needle-free injection cap - Google Patents

Description

Positive pressure needle-free injection cap

This creation relates to an intravenous infusion injection device, particularly to a positive pressure needle-free injection cap.

According to the intravenous infusion of the patient (the infusion may be blood, physiological saline, drugs, nutrients, etc.), in addition to the use of syringes, the use of needle-free syringes, catheters for patients who need to infusion repeatedly And indwelling needles for infusion. In the process of infusion, the injection cap is usually used in combination to reduce the number of times the caregiver performs subcutaneous puncture, and to alleviate the pain of patients who need infusion for a long time.

However, when the needle-free syringe is injected and the needle is pulled out from the injection cap, the pressure in the catheter and the indwelling needle is affected by the negative pressure of the syringe from the injection cap, causing the venous blood or infusion to recirculate. Infusion and venous return can easily cause panic and scare to the patient, or even cause the indwelling needle to be blocked due to blood return. It is necessary to re-puncture the patient after manual cleaning, which not only causes pain to the patient. It also increases medical expenses and the workload of nursing staff.

Therefore, the purpose of the present invention is to provide a positive pressure needle-free injection cap for preventing infusion and blood return during intravenous injection by gravity to avoid the problem of occlusion of the indwelling needle.

The technical means for solving the problems of the prior art is to provide a positive pressure needle-free injection cap, comprising: a cap body having a needle-free injection interface on one side and an output connection on the other side, The needle-free injection interface portion and the output connection portion have an accommodating space, and the needle-free injection interface portion has a syringe interface substantially matching a needle-free injector, and the output connection portion has a limiting portion, the limit a portion of the base extending toward the center of the base and forming an injection inlet for connecting an injection delivery tube; and an elastic sealing member disposed in the cap. The elastic sealing member has a pressure receiving head, a pressing body and a pressure receiving seat in sequence. The pressure receiving head has a closet portion, and the sealing portion substantially closes the syringe interface, and the pressure receiving head a side of the pressing body is formed with a gap between the outer surface of the pressing body and the inner surface of the injection tube portion, the pressure seat has a recess to form a compression space, and the recess is disposed at the limit Department Covering the injection inlet, and forming a fluid passage connecting the flow space and the injection inlet at a boundary between the pressure seat and the limit portion, wherein when the needle-free injector is inserted from the syringe interface, the The pressure head of the elastic sealing member is pressed and bent by the notch portion, and is retracted inwardly by the pressure of the pressure receiving seat, so that the close portion of the pressure receiving head is separated from the injection liquid Forming a gap between the outer surface of the pressure head and the inner surface of the cap body, so that the syringe interface communicates to the injection liquid inlet through the notch space, the flow space and the fluid passage. When the needle-free injector is removed from the syringe interface, the elastic sealing member elastically returns to the original shape, and a liquid volume difference is generated with respect to the pressure, and the liquid volume difference causes a positive pressure to the liquid to flow to the injection inlet. .

In an embodiment of the present invention, a positive pressure needle-free injection cap is provided, the pressure seat being formed as a hollow hemispherical structure.

In an embodiment of the present invention, a positive pressure needle-free injection cap is provided, the outer diameter of the compression body being tapered in a direction of the injector interface toward the injection fluid inlet.

In an embodiment of the present invention, a positive pressure needle-free injection cap is provided, and the junction of the pressure body and the pressure seat forms an angle greater than 90 degrees.

In an embodiment of the present invention, a positive pressure needle-free injection cap is provided, and a hollow space is formed in the interior of the pressure body, and the hollow space is connected to the compression space.

In an embodiment of the present invention, a positive pressure needle-free injection cap is provided, wherein an inner annular surface of the needle-free injection interface portion is formed with a reduced diameter inner edge portion, and the pressure body has a diameter corresponding to the reduction a radially outer edge portion of the inner edge portion, the inner diameter of the reduced diameter inner edge portion being smaller than the outer diameter of the radially outer edge portion, such that the radially outer edge portion is limited by the inner diameter portion of the reduced diameter portion .

In an embodiment of the present invention, a positive pressure needle-free injection cap is provided, the cap body includes a cover member and a base that are sleeved with each other, the cover member has the injection portion, and the base has the The output portion, the cover member is combined with the base system to form the accommodating space.

In an embodiment of the present invention, a positive pressure needle-free injection cap is provided, the notch being a notch formed by a recess at one side of the pressure head.

In an embodiment of the present invention, there is provided a positive pressure needle-free injection cap having an engagement ring that is spaced apart from the injection inlet and extends annularly, the inner annulus of the engagement ring being disposed There is an internal thread.

In an embodiment of the present invention, a positive pressure needle-free injection cap is provided, and the outer diameter surface of the pressure seat is provided with a plurality of convex ring portions protruding radially.

In an embodiment of the present invention, a positive pressure needle-free injection cap is provided, the notch being curved.

The positive pressure needle-free injection cap of the present invention has the following effects. By the structural design of the elastic sealing member and the cap body, when the needle-free injector is pulled out from the syringe interface, the elastic sealing member can quickly rebound back to the original shape, and due to the deformation of the elastic sealing member The volume in the cap body is made smaller, and the effect of positive pressure can be generated, thereby strengthening the force of the infusion to push the indwelling needle, so that the infusion does not remain in the indwelling needle, and the blood is not easily recirculated, thereby preventing the indwelling needle from being clogged. The problem.

Embodiments of the present creation will be described below based on Figs. 1 to 7 . This description is not intended to limit the implementation of the present invention, but is one of the embodiments of the present invention.

As shown in FIGS. 1 to 4, a positive pressure needle-free injection cap 100 according to an embodiment of the present invention comprises: a cap body 1 and an elastic sealing member 2.

The cap body 1 includes a cover member 11 and a base 12 that are sleeved with each other, and the cover member 11 is coupled with the base 12 to form an accommodation space S. The cover member 11 has a needleless injection interface portion 111, and the needleless injection interface portion 111 has a syringe interface 112 that substantially matches a needleless syringe I (as in Fig. 5). The base 12 has an output connection portion 121. The output connecting portion 121 has a limiting portion 122. The limiting portion 122 is formed to extend around an inner wall of the base 12 and surrounds an injection inlet 123 for connecting an injection delivery tube member 300.

The elastic sealing member 2 is disposed in the cap body 1. The elastic sealing member 2 has a pressure receiving head 21, a pressing body 22 and a pressure receiving seat 23 in sequence. The pressure receiving head 21 has a contact portion 211 that substantially closes the syringe interface 112. Specifically, the diameter of the contact portion 211 is slightly larger than the syringe interface 112. A notch portion 212 is formed on a side of the pressure receiving head 21. Specifically, the notch portion 212 is a notch formed by a recess at one side of the pressure receiving head 21 . In detail, in the embodiment, the notch portion 212 is curved, and the arc formed by the arc makes the notch portion 212 easy to bend and deform, and the needle-free injector 1 can be further reduced to be inserted into the syringe interface 1111. The strength required. Of course, the present invention is not limited to the arc shape of the notch portion 212. As shown in Fig. 7, the notch portion 212a of the elastic sealing member 2a is substantially V-shaped to be suitable for other use conditions. A flow space S1 is formed between the outer surface of the pressing body 22 and the inner surface of the cap body 1. The pressure seat 23 is formed as a hollow hemispherical structure. The pressure receiving seat 23 has a recess 231 to form a compression space S2. The recessed portion 231 is disposed in the limiting portion 122 to cover the injection liquid inlet 123, and a junction between the pressure receiving seat 23 and the limiting portion 122 is formed to communicate the flow space S1 and the injection liquid inlet 123. Fluid path P. In this embodiment, the outer surface of the pressure receiving seat 23 has a plurality of convex ring portions 232 protruding radially, and the plurality of convex ring portions 232 are used to increase the elastic restoring force of the pressure receiving seat 23, and When the needle-free injector I is pulled out from the syringe port 126, the elastic sealing member 2 can be quickly rebounded to restore the original shape. Of course, the present invention is not limited to the pressure receiving seat 23 in which the plurality of convex ring portions 232 are formed. As shown in Fig. 7, the outer diameter surface of the pressure receiving seat 23a of the elastic sealing member 2a can be made smooth without protrusion for manufacturing.

Preferably, the inside of the pressing body 22 is formed with a hollow space S3, and the hollow space S3 is connected to the compression space S2.

As shown in FIG. 2 and FIG. 3, in the embodiment, the limiting portion 122 is provided with two or more bumps 124 arranged at intervals, and each of the two adjacent bumps 124 is formed. The fluid passage P. The pressure seat 23 is received by the plurality of bumps 124. The fluid passage P and the flow space S1 are kept in communication by the plurality of bumps 124. Of course, this creation is not limited to this. The fluid passage P may be a passage provided in the stopper portion 122 to communicate the flow space S1 and the injection liquid inlet 123.

In actual use, as shown in FIGS. 4 to 6, the positive pressure needle-free injection cap 100 is connected to a blood vessel inserted into a living body 400 by a tube body 301 of an injection delivery tube member 300. An indwelling needle 500 in (eg, a hand vein).

As shown in FIG. 4, when the needle-free injector 1 is inserted from the syringe port 112, the elastic sealing member 2 is pressed by the needle-free injector 1 to disengage the contact portion 211 of the pressure receiving head 21 a syringe interface 112 and a gap between the outer surface of the pressure head 2 and the inner surface of the cap 1 is formed, so that the syringe interface 112 passes through the syringe interface 112, the notch space, the flow space S1, and the fluid The passage P is connected to the injection inlet 123 for the purpose of injection. At this time, since the elastic sealing member 2 is pressed by the needle-free injector 1, the pressure receiving head 21 is bent by the notch portion 212, and the pressing body 22 and the pressure receiving seat 23 are deformed. The compressed space S2 and the hollow space S3 are reduced, and at this time, the flow space S1 is also enlarged. As shown in FIG. 5, when the needle-free injector I is pulled out from the syringe port 112, the elastic sealing member 2 rebounds to restore the original shape, so that the compressed space S2 and the hollow space S3 are restored to their original size. And generating a liquid volume difference with respect to the pressure, the liquid volume difference causing a positive pressure to the liquid to the injection inlet 123, so that the infusion liquid L in the flow space S1 is subjected to positive pressure propulsion through the The injection inlet 123 and the tube 301 flow into the indwelling needle 500 and are injected into the living body 500.

In this embodiment, the inner annular surface of the needle-free injection interface portion 111 is convexly formed with a reduced-diameter inner edge portion 113, and the pressing body 22 has a radially outer portion corresponding to the reduced-diameter inner edge portion 113. The inner diameter of the reduced diameter inner edge portion 113 is smaller than the outer diameter of the radially outer edge portion 221, and the radially outer edge portion 221 is restricted by the reduced diameter inner edge portion 113. Of course, this creation is not limited to this. The radially outer edge portion may be provided on the pressure receiving head, and the reduced diameter inner edge portion 113 is provided corresponding to the radially outer edge portion to restrict the elastic sealing member 2 to the cap body 1.

As shown in FIG. 2, according to the positive pressure needle-free injection cap 100 of the embodiment of the present invention, the outer diameter of the pressing body 22 is tapered toward the injection port 123 toward the injection port 123. The resistance of the elastic sealing member 2 to deformation when pressed is reduced.

As shown in FIG. 2, according to the positive pressure needle-free injection cap 100 of this embodiment of the present invention, the junction of the pressing body 22 and the pressure receiving seat 23 is formed with an angle θ greater than 90 degrees.

As shown in FIGS. 2 and 5, according to the positive pressure needle-free injection cap 100 of this embodiment of the present invention, the output connecting portion 121 has an engaging ring 125 which is spaced apart from the injection inlet 123. And extending in an annular shape, the inner ring surface of the joint ring 125 is provided with an internal thread, and the output connecting portion 121 is assembled to a joint member 302 of the injection liquid conveying pipe member 300.

As shown in FIG. 2 and FIG. 5, according to the positive pressure needle-free injection cap 100 of the embodiment of the present invention, an outer ring surface of the needle-free injection interface portion 111 is provided with an external thread 114 for profit and Intravenous infusion injection members (not shown) are assembled.

The above description and description are only illustrative of the preferred embodiments of the present invention, and those having ordinary skill in the art may make other modifications in accordance with the scope of the patent application as defined below and the above description, but such modifications are still It is the creative spirit of this creation and is within the scope of this creation.

100‧‧‧ Positive pressure needle injection cap
1‧‧‧Cap
11‧‧‧Cover parts
111‧‧‧ Needle-free injection interface
112‧‧‧Syringe interface
113‧‧‧Reducing the inner edge of the diameter
114‧‧‧ External thread
12‧‧‧Base
121‧‧‧Output connection
122‧‧‧Limited
123‧‧‧Injection inlet
124‧‧‧Bumps
125‧‧‧ joint ring
2, 2a‧‧‧ elastic sealing member
21‧‧‧Indented head
211‧‧‧ 密部
212, 212a‧‧‧ gap
22‧‧‧Compressed body
221‧‧‧radial outer edge
23, 23a‧‧‧ under pressure seat
231‧‧‧ recess
232‧‧‧ convex ring
300‧‧‧Injection delivery fittings
301‧‧‧pipe body
302‧‧‧Connector components
400‧‧‧ organisms
500‧‧ ‧ indwelling needle
I‧‧‧ needleless syringe
L‧‧‧ Infusion
P‧‧‧ fluid pathway
S‧‧‧ accommodating space
S1‧‧‧ mobile space
S2‧‧‧Compressed space
S3‧‧‧ hollow space θ‧‧‧ angle

Fig. 1 is a front elevational view showing a positive pressure needle-free injection cap according to an embodiment of the present invention. Fig. 2 is a cross-sectional view showing the positive pressure needle-free injection cap and a catheter according to the embodiment of the present invention. Fig. 3 is a cross-sectional view showing the positive pressure needle-free injection cap of this embodiment according to the present creation in another angle of view. Fig. 4 is a view showing the positive pressure needle-free injection cap and the catheter inserted into the syringe according to the embodiment of the present invention. Fig. 5 is a schematic view showing the positive pressure needle-free injection cap and the catheter when the syringe is pulled out according to the embodiment of the present invention. Fig. 6 is a view showing the positive pressure needle-free injection cap according to the embodiment of the present invention. Schematic diagram of the time. Fig. 7 is a schematic view showing an elastic sealing member according to another embodiment of the present creation.

100‧‧‧ Positive pressure needle injection cap

1‧‧‧Cap

11‧‧‧Cover parts

111‧‧‧ Needle-free injection interface

112‧‧‧Syringe interface

113‧‧‧Reducing the inner edge of the diameter

114‧‧‧ External thread

12‧‧‧Base

121‧‧‧Output connection

122‧‧‧Limited

123‧‧‧Injection inlet

124‧‧‧Bumps

125‧‧‧ joint ring

2‧‧‧Elastic sealing member

21‧‧‧Indented head

211‧‧‧ 密部

212‧‧‧ gap

22‧‧‧Compressed body

23‧‧‧ Pressure seat

231‧‧‧ recess

232‧‧‧ convex ring

300‧‧‧Injection delivery fittings

301‧‧‧pipe body

302‧‧‧Connector components

S‧‧‧ accommodating space

S1‧‧‧ mobile space

S2‧‧‧Compressed space

S3‧‧‧ hollow space

P‧‧‧ fluid pathway

Claims (11)

A positive pressure needle-free injection cap comprises: a cap body having a needle-free injection interface portion on one side and an output connection portion on the other side, and a capacity between the needle-free injection interface portion and the output connection portion a needle-free injection interface portion having a syringe interface substantially matching a needle-free injector, the output connection portion having a limiting portion formed by an inner wall of the base extending toward the center Enclosing an injection inlet for connecting an injection delivery tube; and an elastic sealing member disposed in the cap, the elastic sealing member sequentially having a pressure head and a pressure a moving body and a pressure receiving seat, the pressure receiving head has a sealing portion, the sealing portion is substantially close to the syringe interface, and a side of the pressure receiving head is formed with a notch portion, and the outer surface of the pressing body is a flow space is formed between the inner surfaces of the injection tube portion, the pressure seat has a concave portion to form a compression space, the concave portion is disposed at the limiting portion to cover the injection liquid inlet, and the pressure receiving seat is Junction of the limit Forming a fluid passage connecting the flow space and the injection inlet, wherein when the needle-free injector is inserted from the syringe interface, the pressure head of the elastic sealing member is pressed and bent by the notch And inwardly retracting by compression of the pressure receiving seat, the adhesion portion of the pressure receiving head is separated from the injection liquid inlet, and an outer surface of the pressure receiving head and an inner surface of the cap body are formed. Having a notch space for the syringe interface to communicate with the injection port through the gap space, the flow space and the fluid passage, and when the needle-free injector is detached from the syringe interface, the elastic sealing member elastically returns to the original shape And, when a volume difference of the liquid is generated with respect to the pressure, the volume difference of the liquid causes a positive pressure to the liquid to the inlet of the injection. The positive pressure needle-free injection cap according to claim 1, wherein the pressure seat is formed into a hollow hemispherical structure. The positive pressure needle-free injection cap of claim 1, wherein the outer diameter of the pressure body is tapered toward the injection port of the syringe. The positive pressure needle-free injection cap of claim 1, wherein the connection between the pressure body and the pressure seat forms an angle greater than 90 degrees. The positive pressure needle-free injection cap according to claim 1, wherein a hollow space is formed in the interior of the pressure body, and the hollow space is connected to the compression space. The positive pressure needle-free injection cap according to claim 1, wherein the inner ring surface of the needle-free injection interface portion is convexly formed with a reduced diameter inner edge portion, and the pressure body has an inner edge portion corresponding to the reduced diameter A radially outer edge portion, the inner diameter of the reduced diameter inner edge portion is smaller than the outer diameter of the radially outer edge portion, such that the radially outer edge portion is limited by the inner diameter portion of the reduced diameter. The positive pressure needle-free injection cap according to claim 1, wherein the cap body comprises a cover member and a base that are sleeved with each other, the cover member has the injection portion, and the base has the output portion. The cover member is combined with the base to form the accommodating space. The positive pressure needle-free injection cap according to claim 1, wherein the notch portion is a notch formed by a recess at one side of the pressure head. The positive pressure needle-free injection cap according to claim 1, wherein the output connecting portion has an engaging ring that is spaced apart from the injection inlet and extends annularly, and the inner ring surface of the engaging ring is provided with a screw tooth. The positive pressure needle-free injection cap according to claim 1, wherein the outer diameter surface of the pressure receiving seat is provided with a plurality of convex ring portions protruding radially. The positive pressure needle-free injection cap according to claim 1, wherein the notch portion is curved.