WO2014183271A1 - Pull positive pressure type medical infusion connector connected to extracorporal indwelling catheter - Google Patents

Abstract

A pull positive pressure type medical infusion connector connected with an extracorporal indwelling catheter comprises a connection seat (1), a connector body (2), and a connector base (3). A front end of the connection seat (1) is connected to an extension pipe (6) of the indwelling catheter. A rear end of the connector body (2) is connected to an infusion device. The connector base (3) is integrally formed with the connection seat (1) or is fixedly connected to the connection seat (1). A front segment of the connector body (2) is inserted in an inner cavity of the connector base (3) in a telescopic and sliding manner. An inner cavity of the connector body (2) communicates with an inner cavity of the connection seat (1) by using a stop valve (4). The infusion connector can prevent and eliminate negative pressure by using a simple and convenient operation. The stop valve (4) structurally ensures that the connector body (2) must be receded first when infusion is carried out again, so that after the infusion is completed, the connector body (2) has push space to eliminate the negative pressure; and due to the stop valve (4), cut-off is gradually performed as the connector body (2) pushes, and accordingly, the stop valve (4) functions as a flow regulating valve.

Description

Drawn positive pressure medical infusion connector connected to extracorporeal indwelling catheter  Instruction manual

 Technical field

 The present invention relates to a device for introducing a medium into a body, and more particularly to a pumping positive pressure medical infusion connector that is coupled to an indwelling catheter in vitro.

 Background technique

In clinical medicine, when a patient needs multiple infusions, an in vitro indwelling catheter is usually used, and the external indwelling catheter and the infusion set are connected in a needle-and-needle-free manner. One of the prior art has a needle connection method as shown in FIG. 1 As shown, the medical infusion connector is composed of a connector 1 and a connector body 2 fixed thereto, which is also commonly referred to as a heparin cap. Infusion set needle from connector body 2 The top sealant plug is inserted. At the same time that the infusion tube is pulled out of the infusion set, the original space occupied by the needle tube is close to the vacuum, and a recompression occurs in the indwelling catheter. The blood will flow back from the blood vessel into the indwelling catheter, and the blood will be blocked by the blood to block the indwelling catheter, and the infusion can not be re-infused. It may cause a blood clot that can cause harm to the patient. Therefore, the medical staff usually needs to take a sealed syringe with a puncture needle to rinse the indwelling catheter. When the sealing operation is performed, the syringe needle penetrates from the heparin cap rubber plug and enters the heparin cap lumen, which must occupy the heparin cap. The cavity space, and at the end of the sealing tube, the medical staff needs to withdraw the sealing tube liquid while withdrawing the syringe needle, and fill the space occupied by the needle tube to avoid recompression in the indwelling catheter. This kind of operation is cumbersome and still leaves the space that the sealing liquid can not be filled. The negative pressure will still be generated. In order to make up for this deficiency, it is customary to clamp the extension tube to the tube after the flow clamp is clamped. The component slides in the direction, so that the extension tube is gradually squeezed, and the liquid in the extension tube is squeezed into the inner cavity of the indwelling catheter to drive out the backflow blood, but the sliding resistance is large when the stop clamp and the extension tube are clamped, and the extension tube is easily extended. The tube is elongated and thinned. During the indwelling, the catheter assembly is pulled repeatedly, and the extension tube is severely broken to cause hemorrhage. In addition, the catheter assembly is left and attached to the patient's body, and the length of the extension tube is limited. Be cautious, the catheter assembly will be pulled out of the patient's body. In order to avoid the above accidents, the medical staff should be cautious when operating. Sometimes the length of the stop clip is not enough, or the blood in the catheter can not be completely cleaned, so this operation is invisible. Increased the workload and psychological burden of medical staff.

 Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art and to provide a pull-positive positive pressure medical infusion connector that can eliminate negative pressure and is convenient to operate and is connected to an indwelling catheter.

 The object of the present invention is achieved by the following route.

The pull-positive positive pressure medical infusion joint connected with the extracorporeal indwelling catheter comprises a connecting seat and a joint body, the front end of the connecting seat is connected with the extension tube of the indwelling catheter, and the rear end of the joint body is connected with the infusion set, and the main points of the composition are: The utility model further comprises a joint base which is integrally formed with the connecting seat or is separately constructed but fixed to the connecting seat, and the front part of the joint body is inserted into the inner cavity of the joint base in a telescopic sliding manner, the joint body The front section and the joint base inner cavity are provided with a damped fitting connection by a seal ring between the joint body, the joint body and the joint base inner cavity or between the joint body and the joint seat inner cavity or the joint body and the joint base The inner cavity of the seat and the inner cavity of the connecting seat have a space in which the joint body is axially displaced, and the inner cavity of the joint communicates with the inner cavity of the connecting seat.

In this way, the inner cavity of the joint base and the connecting seat form a closed cavity, and the volume of the closed cavity is changed by the advancement and retreat of the axial displacement of the joint body. After the joint body is retracted, the closed cavity is enlarged; the joint body is advanced, and the closed cavity is reduced. During the infusion work, the joint body is retracted first, the closed cavity is enlarged, which is convenient for accommodating more liquid; when the infusion is finished, the needle tube is withdrawn, the joint body is advanced, and the closed cavity is enlarged from large to small, thereby filling the space occupied by the original needle tube and preventing negative Press or drain blood from the catheter into the blood vessel to eliminate negative pressure. This method of preventing negative pressure and eliminating negative pressure is simple, effective, and convenient to operate.

 The medical infusion connector of the present invention can be used in either a needleless connection or a needle connection.

 The posterior segment of the connector body is typically used to set the heparin cap or other configuration that interfaces with the infusion set.

 The object of the present invention can also be achieved by the following means.

Also included is a snap device for defining a slip-in position of the joint body that is difficult to axially displace, the snap device being mounted between the joint body and the joint base cavity.

Whether it is a retracted or propelled joint body, once slipped into position, it is desirable to no longer slide the joint body before the next infusion operation, and the snap device can be used to position the joint body so that it is not easily axially displaced.

 The snap device has a variety of specific configurations to choose from, two of which are disclosed below, one of which is:

The buckle device is an elastic buckle, which is composed of a buckle, a spring, and a corresponding card slot disposed on the side wall of the joint body, and is buckled and slipped by the preload of the spring. The card slot that is moved into place is stuck.

 The elastic buckle can realize the positioning and can be disengaged under the action of the pushing and pulling force.

 The other is:

The front part of the joint body is retractably slipped and rotatably inserted into the inner cavity of the joint base, and the buckle device is composed of a bayonet and a sliding groove, and the latch is exposed on the side wall of the joint body, and the sliding groove is correspondingly disposed on the joint On the side wall of the inner cavity of the base, the sliding groove is composed of an axial groove and a transverse groove, and the protruding pin head is sleeved in the sliding groove, and the joint body which is moved in the axial groove is inserted into the transverse groove by rotating the sliding sleeve In the middle, it is axially engaged with the joint base.

 The transverse grooves have a slope, but the oblique angle is smaller than the self-locking angle.

 The inclination facilitates the introduction of the axial groove, and the smaller than the self-locking angle prevents it from sliding by itself under the action of the axial force.

 Further optimizations for the technical solution of the present invention are:

The body cavity of the joint communicates with the inner cavity of the connecting seat through a shut-off valve, and the shut-off valve is disposed in the joint body pushing space and is closed and contacted with the corresponding inner cavity retaining wall by pushing the joint body in position.

 Further optimization of the shut-off valve is:

 The valve flap of the shut-off valve is located at the end of the joint body, and the sealing surface is either located on the inner wall of the joint base or on the inner wall of the joint.

 Thus, the joint body is again a valve stem.

 Further optimization can be as follows:

The inner cavity of the joint comprises a vertical passage and a transverse passage, and the transverse passage is located in the inner core of the joint body, the end of the joint body is smaller than the inner cavity of the joint base, and the gap between the two is used as the infusion passage to communicate with the transverse passage, and the joint body end In a pointed shape, the joint base cavity or the joint cavity inner wall is a truncated cone corresponding to the pointed cone, and the conical opening of the truncated step is an infusion passage port.

When the tapered end of the joint body is in contact with the corresponding tapered step, the shut-off valve is closed; and when the joint body is retracted, the shut-off valve is opened, and the infusion enters the taper through the vertical passage of the joint body, the transverse passage, and the radial gap. The inside of the step is shrinking.

The inner cavity of the joint includes a vertical passage, and the valve flap is a plurality of elastic flaps covering the end of the joint body, and the inner cavity of the joint base or the inner wall of the joint cavity is a plurality of elastic tongue flaps The step corresponding to the closed shape, the inner mouth of the step is an infusion channel, and by the contact with the step, a plurality of elastic tongues close and block the vertical passage opening of the joint body.

In this way, the joint body is pushed into position, the elastic tongue is closed, the shut-off valve is closed; the joint body is lifted back, the elastic tongue is opened by its own elasticity, and the shut-off valve is opened.

The inner cavity of the joint includes a vertical passage, the valve flap is located at the vertical passage opening of the joint body end, and the joint base cavity or the joint cavity inner wall is a sharp cone or circle protruding from the center toward the joint body. a table shape, the retaining wall is distributed with a plurality of infusion channels at a circumferential position around the vertical passage opening, and the tip or the truncated wall of the truncated wall protrudes into the joint body by the advancement of the joint body The channel is blocked and blocked at the vertical channel port.

Since the infusion passage on the retaining wall is located at the periphery of the vertical passage opening, that is, in the region outside the diameter of the vertical passage opening, such that when the central portion of the retaining wall is blocked in the vertical passage opening, the retaining wall The infusion channel cannot be connected to the vertical channel and is thus blocked.

In summary, the present invention has the following advantages over the prior art: the method of preventing negative pressure and eliminating negative pressure is simple, effective, and convenient to operate. The intervention of the stop valve eliminates the negative pressure and cuts off the infusion channel, which is not only more sanitary and safe, but also ensures that the connector body must be retracted before re-infusion (otherwise the valve is closed and cannot be infused). After the infusion, the joint body has a space for advancement to eliminate the negative pressure. The process of gradually intercepting as the joint body advances makes the shut-off valve also function as a flow regulating valve.

 DRAWINGS

 1 is a schematic structural view of an indwelling needle in the prior art

 2 is a schematic view showing the structure of an indwelling needle of a drawn positive pressure medical infusion connector connected to an indwelling catheter according to the present invention;

 3 is a schematic view showing the structure of a pull-positive positive pressure medical infusion joint connected to an indwelling catheter according to a preferred embodiment of the present invention;

 Figure 4 is the A direction view of Figure 3.

 Label description

 1 connector 2 connector body 23 vertical channel 24 bayonet 25 transverse channel 26 clearance 3 connector base 33 sliding slot 4 Globe valve 41 Disc 42 Sealing surface 5 Sealing plug 6 Extension tube 7 Stopper clip 8 Conduit assembly 9 Connector housing.

 detailed description

 Best embodiment:

 Referring to FIG. 2, an indwelling needle of a drawn positive pressure medical infusion connector connected to an indwelling catheter according to the present invention is provided by a connecting seat 1 and a joint body. 2, joint base 3, sealant plug 5, extension tube 6, stop clip 7 and catheter assembly.

 Referring to Figure 3, a pull-positive positive pressure medical infusion connector connected to an indwelling catheter, including a connector 1, a connector body 2, and a connector base 3 , the connecting seat 1 is connected with the extension tube 6 of the indwelling conduit, the rear end of the joint body 2 is connected with the infusion set, the joint base 3 and the connecting seat 1 are separated, but through a screwing device 32 and the connecting seat 1 Secured. Between the joint body 2 and the joint base 3, there is a space for the joint body 2 to advance. The inner body of the joint body 2 communicates with the inner cavity of the joint through a shut-off valve 4, and the shut-off valve 4 is disposed at the joint body 2 It is pushed into the space and is closed by contact with the corresponding cavity stop wall by pushing the joint body 2 in place. Joint base 3 The inner cavity is a stepped cavity with a small front and a large front, and the joint body 2 The front section is telescopically slidably and rotatably inserted into the large cavity, and a damped mating connection is made by a seal ring therebetween. The step of the large small cavity joint is the aforementioned stop wall. Valve flap of shutoff valve 4 41 Located at the end of the joint body, the sealing surface 42 is the stop wall, and the joint body 2 is the valve stem. The body of the joint body 2 includes a vertical passage 23 and a transverse passage 25, and the transverse passage 25 is located at the joint body 2 In the inner core of the end, the end of the joint body 2 is smaller than the inner cavity of the joint base, and the gap 26 between the two serves as an infusion passage communicating with the transverse passage 25, and the joint body 2 The tip has a pointed shape, and the stopping wall is a truncated cone corresponding to the pointed cone, and the constricted opening of the truncated step is an infusion passage opening.

 When the joint body 2 When the tapered end is in contact with the corresponding tapered step, the shut-off valve is closed; and when the joint body is retracted, the shut-off valve is opened, and the infusion is via the joint body vertical passage 23, the transverse passage 25, and the radial clearance 26 And enter the conical step inside the shrinkage.

 Referring to FIG. 4, the buckle device is composed of a bayonet 24 and a sliding slot 33, and the latch 24 is exposed on the side wall of the joint body 2, and the sliding slot 33 correspondingly disposed on the side wall of the joint base 3 and extending through the side wall, the sliding groove 33 is composed of an axial groove and a transverse groove, and the protruding bayonet 24 is sleeved in the sliding groove 33 along the axial groove Push-over joint body 2 Abut the joint base 3 axially by turning the sliding sleeve into the transverse groove. The transverse grooves have a slope, but the oblique angle is smaller than the self-locking angle.

 The parts not described in this embodiment are the same as the prior art.

Claims (10)

1. The pull-positive positive pressure medical infusion joint connected with the extracorporeal indwelling catheter comprises a connecting seat and a joint body, the front end of the connecting seat is connected with the extension tube of the indwelling catheter, and the rear end of the joint body is connected with the infusion set, and is characterized in that The utility model comprises a joint base, which is integrated with the connecting seat or is separately constructed but fixed to the connecting seat, and the front part of the joint body is inserted into the inner cavity of the joint base in a telescopic sliding manner, and the front part of the joint body Damped mating connection with the inner cavity of the joint base by a seal ring between the joint body, between the joint body and the joint base cavity or between the joint body and the joint cavity or the joint body and the joint base The inner cavity and the inner cavity of the connecting seat have a space in which the joint body is axially displaced, and the inner cavity of the joint communicates with the inner cavity of the connecting seat.
2. According to claim 1 The pull-positive positive pressure medical infusion joint connected to the extracorporeal indwelling catheter is characterized in that the utility model further comprises a buckle device for defining that the joint body which is slipped in position is difficult to be axially displaced, the buckle The device is mounted between the connector body and the interior of the connector base.
3. According to claim 2 The pull-type positive pressure medical infusion joint connected with the extracorporeal indwelling catheter is characterized in that the buckle device is an elastic buckle, and the buckle, the spring and the corresponding are embedded on the side wall of the joint base The card slot is disposed on the side wall of the connector body, and is fastened by the preload of the spring to engage with the slot that slides into position.
4. According to claim 2 The pumping positive pressure type medical infusion joint connected with the extracorporeal indwelling catheter is characterized in that the front part of the joint body is retractably slipped and rotatably inserted in the inner cavity of the joint base, and the buckle device is card The pin and the sliding slot are formed, the bayonet pin is exposed on the side wall of the joint body, and the sliding groove is correspondingly disposed on the side wall of the inner cavity of the joint base, the sliding groove is composed of the axial groove and the transverse groove, and the protruding pin head sliding sleeve In the sliding groove, the joint body that is pushed into position along the axial groove is axially engaged with the joint base by rotating the sliding sleeve into the transverse groove.
5. According to claim 4 The pull-positive positive pressure medical infusion joint connected to the extracorporeal indwelling catheter is characterized in that the transverse groove has a slope, but the oblique angle is smaller than the self-locking angle.
6. According to claim 1 The pull-positive positive pressure medical infusion joint connected with the extracorporeal indwelling catheter is characterized in that the joint internal cavity communicates with the inner cavity of the connecting seat through a shut-off valve, and the shut-off valve is disposed in the joint body pushing space and borrows The joint body pushed into position is closed and contacted with the corresponding inner cavity retaining wall.
7. According to claim 6 The pull-positive positive pressure medical infusion joint connected to the extracorporeal indwelling catheter is characterized in that the valve flap of the shut-off valve is located at the end of the joint body, the sealing surface of the shut-off valve or the inner wall of the joint base or It is located on the inner wall of the connecting seat.
8. According to claim 7 The pull-positive positive pressure medical infusion joint connected with the extracorporeal indwelling catheter is characterized in that the joint inner cavity comprises a vertical passage and a transverse passage, and the transverse passage is located in the inner core of the joint body, and the joint body end is smaller than the joint The inner cavity of the pedestal, the gap between the two serves as an infusion channel communicating with the lateral channel, the tip end of the connector body has a pointed cone, and the inner cavity of the joint base or the inner wall of the connecting seat is a kind of tip a corresponding truncated step, the constricted opening of the truncated step is an infusion passage opening, and when the tapered end of the joint body is in contact with the corresponding tapered step, the shutoff valve is closed, and when the joint body is retracted, the shutoff valve When it is opened, the infusion enters the conical step through the vertical channel, the lateral channel and the radial gap of the joint body.
9. According to claim 7 The pull-positive positive pressure medical infusion joint connected to the extracorporeal indwelling catheter is characterized in that the joint inner cavity comprises a vertical passage, and the valve flap is a plurality of elastic tongue flaps wrapped around the end of the joint body. The joint base cavity or the joint cavity inner wall is a step corresponding to the closed shape of the plurality of elastic tongues, and the inner mouth of the step is an infusion channel, and the plurality of elastic tongues are connected by the step Close and block the vertical passage opening of the joint body.
10. According to claim 7 The pull-positive positive pressure medical infusion joint connected with the extracorporeal indwelling catheter is characterized in that the joint inner cavity comprises a vertical passage, the valve flap is located at the vertical passage opening of the joint body end, the joint base cavity or The inner cavity of the connecting seat is a pointed cone or a truncated cone which protrudes in the direction of the joint body. The retaining wall is distributed with a plurality of infusion channels at a circumferential position around the vertical passage opening, by the joint body. The advancement of the tapered or truncated-shaped retaining wall projecting into the vertical passage of the joint body and blocking the cut-off at the vertical passage opening.

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