CN211751520U - Non-traumatic needle for puncture transfusion port - Google Patents

Abstract

The atraumatic needle for puncturing an infusion port comprises a needle tube and a needle core, wherein the needle tube is sleeved on the needle core, the needle core is provided with a needle rod and a needle point, the near end of the needle point is connected with the far end of the needle rod, the far end of the needle point is used for puncturing a septum of the infusion port and forming a wound on the septum, the needle tube comprises a tube head and a tube body, the near end of the tube head is connected with the tube body, the far end of the tube head is tightly sleeved on the needle rod, the far end part of the tube body is used for propping open the wound, each cross section of the outer peripheral surface of the far end part of the tube body is provided with a long shaft and a short shaft which are perpendicular to each other, the long shaft has the largest size in the corresponding cross section, the short shaft of the same cross. The outer contour shape of the part of the needle tube, which is positioned at the damaged opening of the diaphragm, is similar to the shape of the damaged opening of the diaphragm, so that the needle tube can fill the damaged opening of the diaphragm as much as possible, and the liquid leakage phenomenon is prevented to a greater extent.

Description

Non-traumatic needle for puncture transfusion port

Technical Field

The utility model relates to the technical field of medical equipment, and in particular to a not damaged needle for puncturing an infusion port.

Background

Infusion therapy is a treatment means which is widely applied clinically at present, and about 80 percent of hospitalization relates to infusion. The central venous transfusion method can directly deliver medicines, blood products, nutrient substances and the like to the heart, and the medicines are quickly diluted by utilizing larger blood flow of the heart, so that the stimulation of venous transfusion to blood vessels is avoided, and the complications of transfusion are greatly reduced, so that the central venous transfusion is a more clinically common transfusion mode. The infusion port is a fully-implanted central venous infusion composite device, which consists of an injection seat and a catheter, wherein the injection seat is implanted under the skin and is provided with a cavity, and the catheter is punctured into a blood vessel and directly reaches the right atrium. In use, the septum of the injection site is punctured with an atraumatic needle and the drug is infused through the atraumatic needle and delivered to the cardiac site by the catheter.

The atraumatic needle is a specially designed infusion needle and is divided into a coring needle and a non-coring needle. The non-coring needle comprises a needle head and a needle tube, wherein the needle head is arranged on the needle tube, and the needle point of the needle head is designed not to lead the diaphragm material into the needle tube and prevent the diaphragm from being damaged. The coring needle comprises a needle tube and a needle core, and when the coring needle is used for puncture, the needle core blocks an output port at the far end of the needle tube to prevent the septum material from entering the needle tube. After the puncture is finished, the needle core is taken out, and the output port of the needle tube is used as a transfusion passage.

The outer contour of the needle tube of the coring needle near the output port is circular in cross section, and the punctured diaphragm forms a damage port in a shuttle shape, so that a large space is formed between the needle tube and the damage port of the diaphragm, and the risk of liquid leakage is high. In addition, the needle core and the needle tube share a luer connector, the core taking direction and the infusion direction are the same, the infusion tube is perpendicular to the skin surface, is connected with the atraumatic needle and is bent near the skin, and the action of a patient is inconvenient during long-term infusion.

Therefore, the prior art is still insufficient in improving the leakage phenomenon during the puncturing process.

SUMMERY OF THE UTILITY MODEL

The present invention has been made in view of the above-described state of the art. An object of the utility model is to provide a not damaged needle for puncture infusion port, it can improve the weeping phenomenon that appears at the puncture in-process effectively.

The utility model provides a not damaged needle for puncturing transfusion harbor, it includes needle tubing and nook closing member, the needle tubing suit in the nook closing member, the nook closing member has needle bar and needle point, the near-end of needle point with the distal end of needle bar is connected, the distal end of needle point forms puncture most advanced in order to be used for puncturing the diaphragm of transfusion harbor and is in form on the diaphragm and decrease the wound, the needle tubing includes tube head and body, the near-end of tube head is connected the body, the distal end cover of tube head is tight the needle bar, the distal end of body is used for strutting the wound decreases, the body each cross section of the outer peripheral face of distal end portion has mutually perpendicular's major axis and minor axis, the major axis is corresponding have the jumbo size in the cross section, same the minor axis of cross section is less than the major axis and perpendicular to the direction of major axis has maximum, each of the cross sections of the outer circumferential surface of the distal end portion of the tube body is symmetrical with respect to the respective major and minor axes.

Preferably, each cross section of the outer circumferential surface of the cartridge has a major axis and a minor axis perpendicular to each other, the major axis of the cartridge has a maximum dimension within the corresponding cross section, the minor axis of the same cross section is smaller than the major axis and has a maximum dimension in a direction perpendicular to the major axis, and each cross section of the outer circumferential surface of the cartridge is symmetrical with respect to the respective major axis and minor axis.

Preferably, the outer circumferential surface of the tube head is recessed toward the inside of the atraumatic needle when viewed perpendicularly to the axial direction of the atraumatic needle.

Preferably, each cross section of the needle tip except for the cross section where the distal end is located has a major axis and a minor axis that are perpendicular to each other, the major axis of the needle tip is coaxial with the major axis of the tube, the minor axis of the needle tip is coaxial with the minor axis of the tube, the major axis of the needle tip has a maximum size in the corresponding cross section, the minor axis of the needle tip of the same cross section is smaller than the major axis of the needle tip and has a maximum size in a direction perpendicular to the major axis of the needle tip, and each cross section of the needle tip is symmetrical with respect to the respective major axis of the needle tip and the minor axis of the needle tip.

Preferably, the outer circumferential surface of the needle tip is composed of a first half circumferential surface and a second half circumferential surface which are symmetrical about a plane where a long axis of each needle tip is located, the first half circumferential surface and the second half circumferential surface smoothly transition from a proximal end of the needle tip to a distal end of the needle tip, and the first half circumferential surface and the second half circumferential surface are recessed towards the inner side of the needle tip in a direction where a short axis of the needle tip is located.

Preferably, the needle rod is provided with a transition section and a main body section, the proximal end of the transition section is connected with the distal end of the main body section, the distal end of the transition section is connected with the needle tip, the distal end of the tube head is tightly sleeved on the transition section, and the peripheral surface of the transition section smoothly transits from the distal end of the tube head to the proximal end of the needle tip.

Preferably, the proximal end of the needle cannula is provided with a seal capable of sealing the proximal end of the needle cannula after the hub is removed.

Preferably, the sealing member includes a sealing seat and a silicone sheet, the sealing seat is embedded in the proximal end of the tube body, the silicone sheet is mounted on the sealing seat and perpendicular to the puncture direction of the atraumatic needle, and the silicone sheet has a notch which can be opened when the stylet passes through and closed after the stylet is taken out.

Preferably, the proximal end of the tube body is provided with an opening for the stylet to pass through, and the middle part of the tube body is provided with a catheter interface for connecting with an infusion catheter.

Preferably, the distal end of the tube body is located between the catheter hub and the distal end of the tube body.

The technical scheme provided by the disclosure at least has the following beneficial effects:

after the puncture is completed, the outer contour shape of the portion of the needle tube located at the damaged portion of the septum (the distal end portion of the tip) is similar to the shape of the damaged portion of the septum, so that the needle tube can fill up the damaged portion of the septum as much as possible, thereby largely preventing the occurrence of a leakage phenomenon.

Drawings

FIG. 1 is a perspective view of one embodiment of an atraumatic needle for piercing a port provided by the present disclosure.

FIG. 2 is a schematic view of the atraumatic needle of FIG. 1 used to puncture a port in an infusion port during a puncture procedure.

FIG. 3 is a schematic view of the atraumatic needle of FIG. 1 used to puncture a port for fluid infusion during a procedure.

Fig. 4a is a cross-section of the outer surface of the distal end of the tube of the atraumatic needle of fig. 1 for piercing the port.

Fig. 4b is a perspective view of the needle cannula of the atraumatic needle used to puncture the port of infusion in fig. 1.

Fig. 5 is a partially enlarged perspective view of the hub of the atraumatic needle used to puncture the port of infusion in fig. 1.

Fig. 6 is a side view of a portion of the hub of the atraumatic needle used to puncture the port of fig. 1, viewed perpendicular to the first central plane.

Fig. 7 is a side view of a portion of the hub of the atraumatic needle used to puncture the port of fig. 1, viewed perpendicular to the second central plane.

Fig. 8 is a cross-section of the needle tip of the atraumatic needle of fig. 1 used to puncture a port.

Fig. 9 is a perspective view of the sealing seat for the atraumatic needle used to puncture the port of infusion in fig. 1.

Description of reference numerals:

1 needle core, 11 needle point, 11a first semi-circumference, 11b second semi-circumference, 11c edge, 12 needle bar, 121 main body section, 122 transition section, 13 needle handle, 14 needle handle frame, 2 needle tube, 21 tube head, 22 tube body, 220 catheter interface, 221 tube body distal end part, 3 outer cover, 4 transfusion catheter, 5 transfusion port, 61 sealing seat, 62 silica gel sheet, 63 incision.

Detailed Description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the invention, and is not intended to exhaust all possible ways of practicing the invention, nor is it intended to limit the scope of the invention.

As shown in fig. 1 to 4b, the present disclosure provides an atraumatic needle (hereinafter simply referred to as a "atraumatic needle") for puncturing a port 5, which is defined such that the front side in the puncturing direction is the "distal" side and the rear side in the puncturing direction is the "proximal" side, and that the axis of the atraumatic needle is arranged along the puncturing direction at the time of puncturing, and the puncturing direction and the coring direction are separated by 180 degrees. In fig. 4B, the direction a is the direction of the major axis and the direction B is the direction of the minor axis.

The nondestructive needle comprises a needle tube 2 and a needle core 1, wherein the needle tube 2 is sleeved on the needle core 1, the needle core 1 is provided with a needle rod 12 and a needle point 11, the proximal end of the needle point 11 is connected with the distal end of the needle rod 12, and the distal end of the needle point 11 is formed into a puncture tip for puncturing a septum of the transfusion port 5 and forming a wound on the septum. A needle handle frame 14 is connected to the proximal end of the needle rod 12, and a needle handle 13 is mounted (e.g., welded, bonded) to the proximal end of the needle handle frame 14, and the needle handle 13 is used for an operator to grip to remove the needle core 1. The distal end of the needle holder 14 may be connected to the outer cover 3, and the outer cover 3 is fitted over the proximal end of the tube 22.

The needle cannula 2 includes a tubular body 22 and a tip 21, the proximal end of the tip 21 is connected to the tubular body 22, and the distal end of the tip 21 is fitted over the distal end of the needle shaft 12. During the puncture, the needle tip 11, the portion of the needle rod 12 located between the needle tip 11 and the tube head 21, and the distal end portion 221 of the tube body 22 sequentially enter the lesion site of the septum, that is, during the non-destructive needle puncture, the needle tip 11, the portion of the needle rod 12 located between the needle tip 11 and the tube head 21, and the distal end portion 221 of the tube head 21 and the tube body 22 are gradually inserted into the septum, and the lesion site is gradually spread. After the puncture is completed, the distal end 221 of the tube 22 rests within the lesion of the septum and remains distended from the lesion.

Each cross section of the outer circumferential surface of the distal end portion 221 of the tube body 22 has a major axis and a minor axis perpendicular to each other, the major axis having a maximum dimension in the corresponding cross section (i.e., where it is located), the minor axis of the same cross section being smaller than the major axis and having a maximum dimension in a direction perpendicular to the major axis, and each cross section of the outer circumferential surface of the distal end portion 221 of the tube body 22 being symmetrical about the respective major axis and minor axis.

Specifically, the shape of each cross section of the outer surface of the distal end portion 221 of the tube body 22 may be an ellipse, an oval, a shuttle, or the like, and fig. 4a shows that one cross section of the outer peripheral surface of the distal end portion 221 of the tube body 22 is an ellipse.

Thus, after completion of the puncture, the outer contour of the portion of the needle tube 2 located at the damaged portion of the septum (the distal end portion 221 of the tube body 22) is similar in shape to the damaged portion of the septum, so that the needle tube 2 can fill up the damaged portion of the septum as much as possible, thereby largely preventing the occurrence of a leakage phenomenon.

Each cross section of the outer circumferential surface of the tube head 21 may have a major axis and a minor axis perpendicular to each other, the major axis having a maximum dimension in the corresponding cross section (i.e., where it is located), the minor axis of the same cross section being smaller than the major axis and having a maximum dimension in a direction perpendicular to the major axis, each cross section of the outer circumferential surface of the tube head 21 being symmetrical about the respective major and minor axes. Thus, the tip 21 does not expand too much to damage the wound during the puncture procedure.

The cannula body 22 is tapered in the piercing direction to gradually transition to the distal end of the needle shaft 12. For example, the outer circumference of the tube 22 may smoothly transition to the proximal end of the tip 21, i.e., the outer circumference of the tube 22 may not have edges. It will be appreciated that the outer periphery of the portion of the tubular body 22 having a cross-section in the shape of a shuttle has an edge.

The outer peripheral surface of the distal end portion 221 of the tube body 22 may be smooth so that the tip 21 does not scratch the operator when the atraumatic needle is removed after completion of the infusion.

In order to minimize the expansion wound, the outer circumferential surface of the ferrule 21 may be recessed inward of the atraumatic needle when viewed perpendicularly to the axial direction of the atraumatic needle. I.e. in a side view of the intact needle (see fig. 2 and 3), the outer contour of the tip 21 comprises two concave arcs symmetrical about the axis of the intact needle.

As shown in fig. 5 to 8, each cross section of the needle tip 11 other than the cross section where the distal end is located has a major axis and a minor axis perpendicular to each other, the major axis of the needle tip 11 has a maximum dimension in the corresponding cross section, and the minor axis of the same cross section is smaller than the major axis and has a maximum dimension in a direction perpendicular to the major axis. The major axis of each cross-section of tip 11 is coaxial with the major axis of barrel 22, the minor axis of each cross-section of tip 11 is coaxial with the minor axis of barrel 22, and each cross-section of tip 11 is symmetric about the major and minor axes.

By definition, the plane in which the major axis of each cross-section lies is the first central plane, and the plane in which the minor axis of each cross-section lies is the second central plane, the tip 11 is symmetrical about the first central plane and the second central plane. In fig. 8, the a direction is the direction of the major axis, and the B direction is the direction of the minor axis.

Specifically, the cross-sections of the needle tips 11 may be oval, oblong, fusiform, etc., and the distal ends of the needle tips 11 come together to form a linear lesion site at the beginning of the piercing of the septum by the needle tips 11. fig. 8 shows that one cross-section of the needle tip 11 is oval.

Thus, when the needle tip 11 pierces the septum, the needle tip 11 follows the tendency of the septum to self-expand in the lesion, thereby causing no additional breakage of the septum.

The outer circumference of the needle tip 11 is composed of a first half circumference 11a and a second half circumference 11b that are symmetrical about a first central plane, and the first half circumference 11a and the second half circumference 11b each smoothly transition from the proximal end of the needle tip 11 to the distal end of the needle tip 11. Between the first 11a and the second 11b semi-circumferential surface, there is a butt edge 11c, which edge 11c is, for example, a curved line that protrudes outward from the needle tip 11.

When the first and second circumferential halves 11a, 11b have abutting edges 11c, the edges 11c may help to cut the septum so that the septum can be cut quickly.

Further, the first and second half circumferential surfaces 11a and 11b may be recessed inward of the needle tip 11 in the direction of the short axis. In this way, a linear lesion can be formed while the needle tip 11 penetrates the septum, and the lesion of the septum can be spread in the short axis direction as little as possible, thereby further reducing unnecessary expansion of the lesion.

The needle shaft 12 has a transition section 122 and a main body section 121, the proximal end of the transition section 122 is connected to the distal end of the main body section 121, the distal end of the transition section 122 is connected to the needle tip 11, the main body section 121 may be a cylinder, and the outer peripheral surface of the transition section 122 smoothly transitions from the distal end of the tip 21 to the proximal end of the needle tip 11. Transition section 122 ensures that after needle tip 11 enters the lesion, the distal portions of needle shaft 12 and cannula hub 21 are sequentially advanced smoothly into the lesion, allowing the atraumatic needle to penetrate smoothly and smoothly to prevent unwanted dilation of the septum.

The tube 22 includes a proximal end portion and a distal end portion 221, the proximal end of the tube 22 is provided with an opening for the needle cartridge 1 to pass through, the middle of the tube 22 is provided with a catheter hub 220, the catheter hub 220 is used for connecting with the infusion catheter 4, the proximal end portion of the tube 22 is located between the proximal end of the tube 22 and the catheter hub 220, and the distal end portion 221 of the tube 22 is located between the distal end of the tube 22 and the catheter hub 220. After the needle core 1 is removed, the liquid enters the needle tube 2 through the infusion tube 4 and the tube interface 220, and the opening of the proximal end of the tube body 22 can be sealed.

Like this, infusion pipe 4 and the direction of being connected of no damage needle, the infusion direction no longer along coring the direction promptly, and the patient can be at the convenient activity of infusion in-process, has improved use comfort.

After the puncture is completed, the catheter hub 220 may be placed substantially against the skin surface, which minimizes the amount of atraumatic needle exposed to the skin and facilitates securement of the catheter body 22 to the skin.

Specifically, the connection direction of the infusion tube 4 to the non-destructive needle may be perpendicular to the coring direction, i.e., the axis of the needle cannula 2.

A seal may also be provided at the proximal end of the barrel 2 to seal the proximal end of the barrel 2 after the hub 1 has been removed, thereby preventing dust, impurities, etc. from entering the interior of the barrel 2.

As shown in fig. 9, the sealing member may include, for example, a sealing seat 61 (which may be a silicone sealing seat) and a silicone sheet 62, the sealing seat 61 is embedded in the proximal end of the needle tube 2 (the tube body 22), and the silicone sheet 62 is mounted on the sealing seat 61 and perpendicular to the coring direction. The silicone sheet 62 has a slit 63, such as a cross slit, and the slit 63 can be opened when the core 1 passes through and closed after the core 1 passes through. After the removal of the core 1, the slit 63 of the silicone sheet 62 can be automatically closed, thereby automatically sealing the inside of the needle tube 2.

The proximal end of the tube 22 may have an inner diameter less than the inner diameter of the middle portion of the tube 22, i.e., the tube 22 closes off at the proximal end. The middle part of the needle tube 2 for receiving the injection has a larger caliber, so that the flow of the injection cannot be reduced, and the infusion is facilitated.

The process of puncturing with the non-invasive needle provided by the present disclosure is as follows:

when puncturing, the hand-held needle handle 13 and the membrane vertical to the subcutaneous infusion port 5 are inserted into the non-damaged needle, a linear injury opening is formed on the membrane when the needle point 11 of the non-damaged needle just punctures the membrane, then the needle point 11 enters the injury wound and gradually props open the injury wound, and in the process, no material loss exists in the membrane.

Subsequently, the needle shaft 12, the ferrule 21, and the distal end portion 221 of the tube body 22 are sequentially inserted into the lesion, and as the portion of the ferrule 21 and the distal end portion 221 of the tube body 22 inserted into the lesion becomes larger, the lesion is gradually enlarged into a fusiform shape having a major axis in the same direction as the major axis of the ferrule 21 and a minor axis in the same direction as the minor axis of the ferrule 21. Specifically, the maximum cross-sectional area of the outer peripheral surface of the tip 21 is equal to or smaller than the cross-sectional area of the outer peripheral surface of the tube body 22 after the tube body 22 passes through the lesion and opens the lesion to the target, that is, the cross-sectional area of the outer peripheral surface of the tube body 22 located at the position where the tube body 22 opens the lesion at a distance of 1 to 2mm from the base of the port 5 to be punctured.

When the puncture is completed, the needle core 1 is removed and the distal end portion 221 of the tube 22 is positioned in the lesion, so that the tube 22 can maximally fill the lesion, thereby preventing the leakage of the liquid. After the seal seals the proximal end of the body 22, the catheter hub 220 is connected to the infusion catheter 4 for normal infusion.

After the infusion is finished, the nondestructive needle is pulled out while the tube is sealed by positive pressure.

It should be understood that the above embodiments are exemplary only, and are not intended to limit the present invention. Various modifications and alterations of the above-described embodiments may be made by those skilled in the art in light of the teachings of the present invention without departing from the scope thereof.

Claims (10)

1. The utility model provides a not damaged needle for puncturing transfusion harbor, its includes needle tubing (2) and nook closing member (1), needle tubing (2) suit in nook closing member (1), nook closing member (1) has needle bar (12) and needle point (11), the near-end of needle point (11) with the distal end of needle bar (12) is connected, the distal end of needle point (11) forms to puncture most advanced in order to be used for piercing the diaphragm of transfusion harbor (5) and be in form the wound on the diaphragm, needle tubing (2) include tube head (21) and body (22), the near-end of tube head (21) is connected body (22), the distal end of tube head (21) is tightly covered needle bar (12), its characterized in that,

a distal end portion (221) of the tube (22) for expanding the lesion, each cross section of an outer circumferential surface of the distal end portion (221) of the tube (22) having a major axis and a minor axis perpendicular to each other, the major axis having a maximum dimension within the corresponding cross section, the minor axis of the same cross section being smaller than the major axis and having a maximum dimension in a direction perpendicular to the major axis, each of the cross sections of the outer circumferential surface of the distal end portion (221) of the tube (22) being symmetrical about the respective major and minor axes.

2. The atraumatic needle for a puncture port according to claim 1, characterized in that each cross section of the outer peripheral surface of the tip (21) has a major axis and a minor axis perpendicular to each other, the major axis of the tip (21) having a maximum dimension within the corresponding cross section, the minor axis of the same cross section being smaller than the major axis and having a maximum dimension in a direction perpendicular to the major axis, each of the cross sections of the outer peripheral surface of the tip (21) being symmetrical with respect to the respective major axis and minor axis.

3. The atraumatic needle for puncture ports according to claim 2, characterized in that the outer circumference of the tube head (21) is recessed towards the inside of the atraumatic needle when viewed perpendicularly to the axial direction of the atraumatic needle.

4. The atraumatic needle for a puncture port according to claim 1, characterized in that each cross section of the needle tip (11) other than the cross section where the distal end is located has a major axis and a minor axis perpendicular to each other, the major axis of the needle tip (11) is coaxial with the major axis of the tube (22), the minor axis of the needle tip (11) is coaxial with the minor axis of the tube (22), the major axis of the needle tip (11) has a maximum dimension in the corresponding cross section, the minor axis of the needle tip (11) of the same cross section is smaller than the major axis of the needle tip (11) and has a maximum dimension in a direction perpendicular to the major axis of the needle tip (11), and the other cross sections of the needle tip (11) are symmetrical with respect to the respective major axis of the needle tip (11) and the minor axis of the needle tip (11).

5. The atraumatic needle for a puncture port according to claim 4, characterized in that the outer circumferential surface of the needle tip (11) is composed of a first semi-circumferential surface (11a) and a second semi-circumferential surface (11b) which are symmetrical with respect to a plane where the major axis of each of the needle tips (11) is located, the first semi-circumferential surface (11a) and the second semi-circumferential surface (11b) each smoothly transition from the proximal end of the needle tip (11) to the distal end of the needle tip (11), and the first semi-circumferential surface (11a) and the second semi-circumferential surface (11b) are recessed inward of the needle tip (11) in the direction where the minor axis of the needle tip (11) is located.

6. The atraumatic needle for a puncture port according to claim 1, wherein the needle shaft (12) has a transition section (122) and a main body section (121), the proximal end of the transition section (122) is connected to the distal end of the main body section (121), the distal end of the transition section (122) is connected to the needle tip (11), the distal end of the tube head (21) is tightly sleeved on the transition section (122), and the outer peripheral surface of the transition section (122) smoothly transitions from the distal end of the tube head (21) to the proximal end of the needle tip (11).

7. The atraumatic needle for puncture ports according to claim 1, characterized in that the proximal end of the needle cannula (2) is provided with a seal capable of sealing the proximal end of the needle cannula (2) after the core (1) has been removed.

8. The atraumatic needle for puncture ports according to claim 7, characterized in that the sealing member comprises a sealing seat (61) and a silicone sheet (62), the sealing seat (61) is embedded at the proximal end of the tube (22), the silicone sheet (62) is mounted on the sealing seat (61) and perpendicular to the puncture direction of the atraumatic needle, the silicone sheet (62) has a cut (63), the cut (63) can be opened when the needle core (1) passes through and closed after the needle core (1) is taken out.

9. The atraumatic needle for puncture ports according to claim 1, characterized in that the proximal end of the tube (22) is provided with an opening for the passage of the needle hub (1), the middle of the tube (22) is provided with a catheter hub (220), and the catheter hub (220) is used for connecting with an infusion catheter (4).

10. The atraumatic needle for piercing ports according to claim 9 wherein the distal portion (221) of the tube (22) is located between the catheter hub (220) and the distal end of the tube (22).

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