KR102005309B1 - Catheter hubs and catheters to prevent backflow of blood - Google Patents

Abstract

The present invention provides a catheter hub, which includes a body in which an inner space is formed and a rear end thereof is opened; a gasket which is made of an elastic material which is accommodated in the inner space of the body and has an incision allowing the entry and exit of a cannula needle, but is restored upon release of the cannula needle to seal the tip of the body; and a holder which is pressed after a connection tip for injecting a chemical liquid is fastened after the cannula needle is released, and opening the incision by pressing the incision in the tip direction without a tip portion stored inside the gasket penetrating through the incision. Therefore, the present invention prevents backflow of blood and allows needle reuse.

Description

[0001] CATHETER HUBS AND CATHETERS TO PREVENT BACKFLOW OF BLOOD [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catheter hub and a catheter for preventing backflow of blood and capable of replacing or reusing a drug solution to be connected after withdrawal of the catheter.

In general, patients who have difficulty in ingesting food, patients who need surgery, and patients who need to supply nutrients due to decreased function of the human body should be supplied with liquid through a set of liquids. In this case, the sap is often directly administered to the blood vessel of the patient. For this purpose, the medical practitioner usually fixes the catheter to the patient's blood vessel, and connects the supply tube of the fluid set to the catheter to supply the fluid.

The catheter may be connected to the blood vessel of the patient even when the supply tube of the set of fluid is separated in the case of necessity of replacement of the fluid, for example, so that the patient's blood may flow backward from the catheter hub. Therefore, the catheter is required to have a configuration for preventing backflow of blood.

Figures 1 and 2 show a conventional catheter in which backflow of blood is prevented. Referring to Figures 1 and 2, a conventional catheter 100 includes a catheter hub 110 having a hollow tube support tube 112 integrally formed at its tip, a catheter tube 130 inserted into a blood vessel, A cannula 140 that extends through the interior of the cannula 110 and protrudes from the distal end of the catheter tube 130 and a cannula hub 140 that is coupled to the back of the catheter hub 110, (150).

Here, the conventional catheter 100 includes a gasket 160 and a holder 170 fixed to the inside of the catheter hub 110 to prevent backflow of blood.

The catheter 100 is inserted into the blood vessel with the cannula 140 and then the blood that is refluxed in the catheter hub 130 is removed by the gasket 160 when the cannula 140 is removed from the catheter hub 110 . Then, the practitioner connects the connection tip as shown in FIG. 2 to supply the patient with blood or fluid. However, in the conventional catheter 100, when the connecting tip is connected to the catheter hub 110, when the connecting tip pushes the holder 170, the tip of the holder 170 is fastened through the gasket 160. Therefore, in the conventional catheter 100, when the connection tip is connected to the catheter hub 110 once, the distal end of the holder 170 penetrates the gasket 160, and the retaining jaw 174 of the holder 170 contacts the gasket 160. [ Since the structure is in close contact with the front surface of the base plate 160, a new connection tip can not be reinstalled. That is, the holding jaw 174 of the holder 170 is wedge-shaped and is difficult to draw out toward the rear side of the gasket 160. Even if the holding jaw 174 of the holder 170 is pulled out toward the back of the gasket 160 A new connection tip could not be installed because the patient's blood flowed back to the open portion of the gasket 160 by the latching jaw 174 of the holder 170. [

In summary, conventional catheter hubs can not be reused when they are configured to prevent backflow of blood. Therefore, if the connecting tip of liquid or blood is connected after insertion of the cannula, it can not be replaced with another type of connecting tip . The present applicant has devised a catheter hub and a catheter that can replace the connection fluid of blood or the blood, and prevent the backflow of blood during the replacement process.

Korean Patent No. 1034953

The present invention seeks to provide a catheter hub and a catheter that can prevent the backflow of blood.

Another object of the present invention is to provide a catheter hub and a catheter which can detach and attach the connecting tip for injecting a liquid such as liquid or blood, and prevent the backflow of blood even when the connecting tip is detached.

According to an aspect of the present invention, there is provided a catheter hub comprising: a body having an inner space formed therein and an open rear end; A gasket of an elastic material accommodated in an inner space of the body and having an incision for receiving and withdrawing the cannula needle and restoring the cannula needle when the cannula needle is released to close the tip of the body; And a connection tip for injecting a chemical solution after releasing the cannula needle is fastened and pressed so that a distal end housed inside the gasket does not penetrate through the incision so as to press the incision in the direction of the tip, and a holder for opening the needle so that blood can be prevented from flowing backward and the needle can be reused.

Preferably, the gasket further comprises: an upper disc formed with the incision; And a lower disk into which a distal end of the holder is inserted, wherein the upper disk pushes the tip of the holder when the cannula needle or the connection tip is released to close the incision And may have a predetermined thickness so as to have a restoring force.

Advantageously, the holder can have a drive range that is advanced in the direction of the upper disc by a distance from the stationary state in which the tip is received in the lower disc to the extent that the incision can be opened.

Preferably, the holder includes a stopper that defines a region to be advanced in a tip direction of the body, and can be driven in a range where the gasket does not penetrate.

Preferably, the holder may be defined as a tip portion in which a first step protruding to the proximal side functions as the stopper, and a region from the first step to the tip end is housed inside the gasket.

Preferably, the holder comprises: a first step projecting proximal; And a second step is formed at the tip end to be housed inside the gasket, and the width of the groove formed by the first step and the second step can define the driving range of the tip end.

Preferably, the gasket further comprises: an upper disc formed with the incision; And a lower disk for receiving the tip of the holder through a fastener for holding the groove, wherein the width of the groove is longer than the thickness of the fastener.

Further, the present invention provides a backflow prevention catheter, comprising: a catheter hub having a tube extending at a predetermined length at a distal end thereof; A cannula having a cannula needle penetrating into the interior of the catheter hub and inserted into a blood vessel with the tube; And a blood cut-off portion provided inside the catheter hub to block backflow of blood, wherein the blood cut-off portion includes a gasket having an incision for restoring the distal end of the catheter hub when the cannula needle is released, And a holder which is housed inside the gasket and which is driven forward and backward to be driven forward and backward and which is retracted by the restoring force of the gasket while opening the incision opening at the time of advancing and the holder can be advanced so as not to pass through the incision opening.

According to the present invention, there is disclosed a configuration of a gasket and a holder that are mutually interlocked so that the incision can be opened and closed when the cannula or the connecting tip fastened to the catheter hub is detached or attached. According to the present invention, the driving range of the holder is limited so that the stopper of the holder does not penetrate the gasket when the connection tip is fastened, and the incision is opened and the incision is closed naturally even when the connection tip is removed .

Therefore, the catheter hub according to the present invention is not consumed with replacement of the connecting tip, the connecting tip can be replaced, and the backflow of blood can still be prevented even when the connecting tip is replaced. In addition, the patient receiving the fluid using the catheter according to the present invention can prevent the blood from flowing back even if the connection tip of the fluid is separated, so that the patient can separate the connection tip in a situation where a predetermined activity such as a toilet is required , It is possible to easily rejoin the later connection tips.

Figure 1 shows a conventional anti-reflux catheter.
Figure 2 shows a view of a catheter in which the fluid connection tip is fastened after withdrawal of the cannula in the catheter of Figure 1;
Figure 3 shows a catheter hub according to an embodiment of the present invention.
Fig. 4 shows a configuration of a blood cut-off unit according to an embodiment of the present invention.
5 shows a driving state of a gasket and a holder according to an embodiment of the present invention.
Figure 6 shows a holder according to another embodiment of the present invention.
FIG. 7 shows a catheter according to an embodiment of the present invention. FIG.
8 is a perspective view of a catheter according to an embodiment of the present invention.
FIG. 9 illustrates a connection tip replacement of a backflow prevention catheter according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the exemplary embodiments. Like reference numerals in the drawings denote members performing substantially the same function.

The objects and effects of the present invention can be understood or clarified naturally by the following description, and the purpose and effect of the present invention are not limited by the following description. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Figure 3 shows a catheter hub 10 in accordance with an embodiment of the present invention.

Referring to FIG. 3, the catheter hub 10 may include a body 11, a tube 13, and a blood barrier 14. The catheter hub 10 introduces the tube 13 into the patient's blood vessel with a puncture procedure of the cannula 50 (FIG. 7). Thereafter, when the connection tip 30 for drug solution injection is fastened to the catheter hub 10, the continuous drug solution can be supplied through the tube 13 inserted into the blood vessel. The drug solution referred to in the present specification is generically referred to as a therapeutic drug for patients, including sap, blood, and the like.

The supply of the single-dose drug to the blood vessel is completed by the single-dose puncture of the syringe. On the other hand, when it is necessary to continuously administer medication such as blood transfusion or ringer, the catheter hub 10 similar to the present embodiment is used, and the connection tip 30 of the medicament must be mediated into the blood vessel. In this process, the catheter hub 10 is provided with an infusion of cannula 50 (FIG. 7) for initial vascular invasion and removal of the cannula 50 (FIG. 7) to fasten the connecting tip 30 after inflation is complete Process. At this time, when the cannula 50 (FIG. 7) is removed, the blood can be backwashed into the catheter hub 10 inserted into the blood vessel. Accordingly, it is desirable that the catheter hub 10 be capable of blocking the backflow of blood during withdrawal of the cannula 50 (FIG. 7). For a clearer description of this embodiment, blocking the backflow of blood during withdrawal of the cannula 50 (FIG. 7) is referred to as primary blockage.

Meanwhile, after the connection tip 30 is connected to the catheter hub 10 without the backflow of the blood due to the primary blockage, the patient is supplied with a sufficient amount of the drug solution and the connection tip 30 is temporarily separated or replaced A situation occurs frequently. When the connection tip 30 is detached, it should be able to block the reverse flow of blood back to the catheter hub 10 as in the first occlusion. For a clearer description of this embodiment, blocking the backflow of blood during withdrawal of the connecting tip 30 is referred to as secondary blockage.

The catheter hub 10 according to the present embodiment is configured to be capable of both primary interception and secondary interception of blood, so that the connection tip 30 can be replaced or removed. Hereinafter, the detailed structure of the catheter hub 10 will be described.

The body 11 is formed with an inner space and its rear end is opened. The cannula 50 (FIG. 7) or the connecting tip 30 can be fastened to the open rear end of the body 11. The inner space of the body 11 communicates with the tube 13 connected to the tip of the body 11. [ Therefore, it is preferable that the needle 11 is closed so that the blood flowing backward from the tube 13 is blocked. A blood cut-off portion 14 is provided in the inner space of the body 11 for blocking the blood flowing backward. Fig. 4 shows a configuration of the blood cut-off portion 14 according to the embodiment of the present invention.

Referring to FIG. 4, the blood blocking portion 14 may include a gasket 141 and a holder 143. The gasket 141 is accommodated in the inner space of the body 11 and restored when the cannula needle 51 (Fig. 7) is released while the cannula needle 51 (Fig. 7) A cutting tool 1411 may be formed. In this embodiment, the gasket 141 may be provided as a synthetic material of a rigid silicone rubber capable of securing a predetermined elasticity and restoring force.

The gasket 141 may be composed of an upper disc 1413 and a lower disc 1414. The upper disk 1413 and the lower disk 1414 can be formed integrally. The upper disk 1413 has a function of a valve that is fixedly coupled to the tip end of the body 11 to close the tip of the body 11 to block the reverse flow of the blood.

A cutout 1411 is formed in the upper disc 1413 and a function of a valve for blocking the reverse flow of blood by opening and closing the cutout 1411 can be performed. In this embodiment, the incision opening 1411 may be formed by cutting through the upper disc 1413. Cutting of the cutout 1411 may be performed once, but in FIG. 4, three cuts having a center contact point of 120 ° are illustrated for the flexible opening and closing of the cutout 1411.

The upper disc 1413 is disengaged from the upper disc 1413 when the cutout 1411 pushes the tip end 1430 of the holder 143 when the cannula needle 51 (Fig. 7) or the connecting tip 30 is released and the cutter 1411 is closed closing of the valve body. In this embodiment, the upper disc 1413 preferably has a thickness of 0.5 mm to 1.2 mm.

The lower disk 1414 refers to the rear end configuration of the gasket 141 into which the tip end portion 1430 of the holder 143 is inserted. The lower disk 1414 accommodates the tip portion 1430 of the holder 143 through the fastener 1410 (FIG. 5). The lower disk 1414 is held in close contact with the inner surface of the fastener 1410 (FIG. 5) by the second step 1431 of the holder 143 to be described later so that the leading end 1430 of the holder 14 is not pulled out So that it is housed in the inner space of the lower disk 1414.

The height of the inner space of the lower disk 1414 is preferably designed to correspond to the distance from the tip of the tip end 1430 of the holder 14 to the lower surface of the second step 1431. Therefore, when there is no external force, the tip of the holder 143 is provided in the lower disk 1414 in a collapsed state in close contact with the lower surface of the upper disk 1413 without clearance.

The holder 143 is fastened with the connection tip 30 for injecting the chemical solution after the cannula needle 51 (Fig. 7) is released and the tip end 1430 accommodated inside the gasket 141 is inserted into the incision opening 1411 The cutout 1411 can be opened by pressing the cutout 1411 in the tip direction without passing through the cutout 1411. [

The holder 143 has a chemical solution injection path penetrating the inside thereof, and has a structure in which the tip is wedge-shaped. The distal end of the holder 143 is tapered to gradually expand its inner diameter and the connection tip 30 is pressed against the rear end of the holder 143 so that the connection tip 30 is fastened to the catheter hub 10 Can be achieved.

The holder 143 is formed with a stopper 1433 that defines a region to be advanced in the tip direction of the body 11 so that the gasket 141 can be driven in a range where the gasket 141 is not penetrated. The holder 143 has a first step 1433 protruding to the proximal side and a second step 1431 formed at the tip end so as to be housed inside the gasket 141. The first step 1433 and the second step 1433, The width of the groove 145 formed by the front end portion 1431 can define the driving range of the front end portion 1430.

The width of the groove 145 may be longer than the thickness of the fastener 1410. The width of the groove 145 is longer than the thickness of the fastener 1410 so that a predetermined clearance G (FIG. 5) exists in the tip portion 1430 housed in the lower disk 1414. This will be described later in conjunction with FIG. 5 as an important design element in the driving range of the holder 143.

The holder 143 can be defined as a tip end 1430 in which the first step 1433 functions as the stopper and the region from the first step 1433 to the tip is housed inside the gasket 141.

The holder 143 is driven such that the distal end of the connecting tip 30 presses the rear end of the holder 143 to advance a predetermined distance when the connecting tip 30 is fastened to the catheter hub 10. When the connecting tip 30 is detached from the catheter hub 10, the holder 143 is driven so that the external force for pressing the rear end of the holder 143 is released and retracted by the restoring force of the top disk 1413. In this specification, the distance that the holder 143 is advanced or retracted according to the attachment / detachment of the connecting tip 30 is collectively referred to as the driving range.

The holder 143 has a driving range in which the distal end portion 1430 is advanced in the direction of the upper disc 1413 by a distance from the stop state in which the distal end portion 1430 is accommodated in the lower disc 1414 to the extent that the incision opening 1411 can be opened .

5 shows a driving state of the gasket 141 and the holder 143 according to the embodiment of the present invention. 5, the shape of the blood cut-off portion 14 before the connection tip 30 is tightened in order and the blood that the holder 143 is pressed while the connection tip 30 is fastened and the incision opening 1411 is opened The shape of the blocking portion 14 and the shape of the blood blocking portion 14 where the holder 143 is retracted and the incision port 1411 is closed while the connection tip 30 is separated can be confirmed.

 Referring to the state of the blood blocking portion 14 before the connection tip 30 is fastened, the incision opening 1411 of the gasket 141 is closed with the holder 143 being stored in the lower disk 1414 and stopped . In this case, the distal end of the catheter hub 10 is closed to prevent backflow of blood. The blood cut-off portion 14 is driven by the state of the catheter hub 10 before the catheter 50 (FIG. 7) of the initial cannula 50 (FIG. 7) It is the same. Therefore, in the present state, the incision opening 1411 is closed to perform the primary cut-off of the above-described reverse blood flow. The holder 143 has a gap G from the first step 1433 corresponding to the stopper to the lower surface of the lower disc 1413 because the width of the groove 145 is longer than the thickness of the fastener 1410. [ . The gap G provides a driving distance at which the front end portion 1430 of the holder 143 can be further advanced toward the gasket 141. [

Referring to the state of the blood blocking portion 14 in which the holder 143 is pressed while the connection tip 30 is fastened and the incision 1411 is opened, it can be seen that the holder 143 is driven forward by a pressing force. When the holder 143 is advanced, the upper disc 1413 receives the advancing drive of the holder 143 while the incision opening 1411 is opened. On the other hand, the range in which the holder 143 advances is limited due to the first step 1433, which is a stopper. The range in which the holder 143 is driven forward is determined by the gap G which is the clearance formed by the groove 145. The gap G is formed within a range in which the holder 143 does not exceed the upper disc 1413 through the cutout 1411. [ In this state, the chemical solution can be introduced from the connection tip 30 connected to the rear end of the holder 143 by communicating the hollow of the cutout 1411 and the holder 143. The distal end portion 1430 of the advancing holder 143 is spaced from the inner side of the lower disc 1413 from the fastener 1410 of the lower disc 1414 by the distance of the gap G. [

Referring to the state of the blood cut-off portion 14 in which the holder 143 is retracted and the incision 1411 is closed while the connection tip 30 is dismounted, the connection tip 30 is detached and the external force Is removed. When the external force that presses the holder 143 is removed, the upper disc 1413 having a sufficient restoring force with a sufficient thickness retracts the holder 143 by the elastic force. The holder 143 is retracted to the initial retracted state, and the incision opening 1411 of the upper disc 1413 is also closed. As the incision 1411 is closed, the distal end of the catheter hub 10 is closed to block the backflow of blood. Therefore, in this state, even when the connection tip 30 is detached, a secondary cutoff in which the backflow of blood is blocked can be achieved.

As described above, the catheter hub 10 according to the present embodiment includes the structure of the blood cut-off portion 14 for blocking the backflow of blood, and the valve mechanism for opening / And separation is possible. Also, since the second tip of the catheter hub 10 can be blocked by preventing the backflow of the blood, the connection tip 30 can be reused without being consumed.

6 shows a holder 143 'according to another embodiment of the present invention.

Referring to FIG. 6, the holder 143 'according to the present embodiment performs the same function as the holder 143 illustrated in FIG. 4, but is an example in which the design is modified according to manufacturing convenience. The holder 143 'has a first step 1433' protruding in the proximal direction and a second step 1431 'formed in the tip end so as to be housed inside the gasket 141. The first step 1433' The width of the groove 145 'formed by the second step 1431' can define the driving range of the tip end 1430 '.

Unlike the holder 143 of FIG. 4, the holder 143 'according to the present embodiment is provided with a reduced-length proximal portion as a body. The proximal portion of the holder 143 'refers to the body of the holder 143' and refers to the component that is in contact with the connecting tip 30. The proximal portion of the holder 143 'is compatible with the length of the connection tip 30 and may be formed as shown in FIG. 4 or may be formed as short as shown in FIG. The second step 1431 'engages the fastener 1410 of the gasket 141 to accommodate the holder 143' in the lower disc 1414. The first step 1433 'is provided with a holder 143 on the lower surface of the fastener 1410 so that the holder 143' does not penetrate the gasket 141 even if the holder 143 ' '). The width of the groove 145 'formed by the first step 1433' and the second step 1431 'determines the driving range of the holder 143'. The width of the groove 145 'may be designed in consideration of the thickness of the upper disc 1413 of the gasket 141.

Fig. 7 shows a catheter 1 according to an embodiment of the present invention. 7, the anti-reflux catheter 1 includes a catheter hub 10, a cannula 50 having a cannula needle 51 which is inserted into the interior of the catheter hub 10 and inserted into the blood vessel with the tube 13, (50), and a blood barrier (14). The catheter 1 according to the embodiment of FIG. 7 discloses an embodiment in which the catheter hub 10 and the blood cutoff portion 14 described above in FIGS. 1-5 are fastened together with the cannula 50. The blood backflow prevention function of the backflow preventive catheter 1 according to the present embodiment omits the redundant use as described above.

Fig. 8 shows a puncture of the anti-reflux catheter 1 according to the embodiment of the present invention. 8 is a view showing a state in which the catheter 1 is punctured into the vein of the patient in order and the connecting tip 30 for withdrawing the cannula 50 from the catheter hub 10 and injecting the drug solution 3, To the hub (10). In a state before the cannula 50 is drawn out and the connecting tip 30 is connected to the catheter hub 10, the incision opening 1411 is closed as shown in Fig.

FIG. 9 shows a modification of the connection tip 30 of the backflow prevention catheter 1 according to the embodiment of the present invention. 8 is a view showing a state in which the connection tip 30 is connected to the catheter hub 10 and the patient is supplied with the medicament solution 3 after the connection tip 30 is detached from the catheter hub 10, 3 '. < / RTI >

In the state before the connection tip 30 is disconnected from the catheter hub 10 and then the other connection tip 30 'for supplying another drug solution 3' is fastened, as shown in FIG. 5, So that the backflow of the blood is blocked secondarily.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. will be. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by all changes or modifications derived from the scope of the appended claims and equivalents of the following claims.

1: Anti-reflux catheter
3: Solution
10: catheter hub
11: Body
13: Tube
14:
141: Gasket
1410: Fastener
1411: incision
1413: upper disk
1414:
143: Holder
145: Groove
1430:
1433: 1st step
1431: Second step
30: Connection Tips
50: cannula
51: cannula needle

Claims (8)

In a catheter hub,
A body formed with an inner space and a rear end opened;
A gasket of an elastic material accommodated in an inner space of the body and having an incision for receiving and withdrawing the cannula needle and restoring the cannula needle when the cannula needle is released to close the tip of the body; And
And a connecting tip for injecting a chemical solution after releasing the cannula needle is fastened and pressed so that a distal end housed inside the gasket does not penetrate through the incision so as to press the incision in the distal direction to open the incision open,
Wherein the holder comprises:
The tip end portion is maintained in a state of being engaged with the gasket under the clearance of the driving range,
The gasket
The distal end portion is gripped such that the inner side surface on which the incision is formed abuts on the distal end portion,
Wherein the holder includes a first step formed at a tip of the second step held by the gasket and spaced a predetermined distance below the second step, Wherein the first step is located at a distance spaced from a lower end of the gasket by a drive range (G) of the holder,
Wherein the gasket and the holder are assembled into a blood cut-off portion that blocks backflow of blood in a state where the gasket and the holder are engaged with each other, and is fitted into the inner space of the body.
The method according to claim 1,
The gasket
An upper disc having the incision; And
And a lower disk into which the tip of the holder is inserted,
The upper disk includes:
Wherein the cutter has a predetermined thickness such that when the cannula needle or the connection tip is detached, the cutter pushes the tip of the holder to have a restoring force to close the cutter.
delete delete delete delete The method according to claim 1,
The gasket
An upper disc having the incision; And
And a lower disc for accommodating a tip end of the holder through a fastener for holding a groove formed by the first step and the second step,
Wherein a width of the groove is greater than a thickness of the fastener and a length greater than a length of the fastener defines a drive range G of the holder.
A catheter hub having a tube extending a predetermined length at its tip;
A cannula having a cannula needle penetrating into the interior of the catheter hub and inserted into a blood vessel with the tube; And
And a blood blocking portion provided inside the catheter hub to block backflow of blood,
The blood-
A gasket restored when the cannula needle is released to seal the distal end of the catheter hub;
And a holder which is housed inside the gasket and which is driven forward and backward to be retracted and driven, and which is retracted by the restoring force of the gasket to open the incision port when advancing,
The holder being advanced so as not to penetrate the incision,
Wherein the holder comprises:
Wherein the holder is held at the tip by a second step held by the gasket, and a predetermined portion of the holder is formed in a lower position than the second step And a second step formed on the gasket so as to be spaced apart from the lower end of the gasket so as to be spaced from the lower end of the gasket by a driving range G of the holder, A first step is located,
The gasket
Wherein the gasket and the holder are coupled with each other to block the backflow of the blood in the state where the gasket and the holder are fastened to each other, Assembled into an interior space of the catheter hub.

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