CN110354334A - Transfusion port puncture needle head and its manufactured transfusion port puncture needle - Google Patents

Abstract

A puncture needle for an infusion port. The whole needle is in the cylindrical space wrapped by the outer surface of the puncture needle. The needle tube where the whole needle is located is a bent section. The axis is a curved axis, the main edge surface is an annular plane, and the closed figure surrounded by the outer contour of the main edge surface has no intersection with the puncture needle axis; the main edge surface and the puncture needle tube wall form two cutting edges. The invention also discloses a puncture needle for an infusion port made by using the above-mentioned puncture needle for an infusion port. Compared with the prior art, the technical effect of the present invention is that, due to the unique design of the present invention, the radial distance between the two blade tips is very small, and when the puncture needle punctures the septum, the trajectory of the two cutting blades is approximately One, to avoid the strip diaphragm, reducing the probability of the diaphragm being cut.

Description

Puncture needle for infusion port and the puncture needle for infusion port made therefrom

technical field

The invention relates to an infusion port component.

Background technique

Implantable venous infusion port (also known as infusion port) is currently clinically indispensable. The infusion port is a fully implanted vascular access system that can provide long-term blood treatment access, especially for targeted therapy .

Contents of the invention

The technical problem to be solved in the present invention:

The product technical requirements of the infusion port state that the puncture window must withstand more than 1,000 operations of the puncture needle during use without leakage. appears to be crucial.

However, referring to Fig. 1 for a common puncture needle, the blade surface of the needle 50 of the puncture needle has two cutting edges at the needle 50: one is the outer cutting edge 51 at the far end, and this cutting edge is mostly located on the outer wall of the puncture needle tube; The other is the inner cutting edge 52 at the proximal end, which is located on the inner wall of the puncture needle tube; the radial distance d (that is, the distance between their projections on the cross-sectional plane of the needle tube) of the two cutting edges is greater than the inner diameter of the puncture needle tube.

When the puncture needle passes through the puncture window, the trajectories of the above two cutting edges should be two independent ones. Generally, the traces left by the outer cutting edge are similar to V-shaped, while the traces left by the inner cutting edge generally cannot be compared with The traces left by the outer cutting edge coincide, so that the inner cutting edge will inevitably form another incision besides the kerf formed by the outer cutting edge on the puncture window, although the puncture window will rely on its own material properties to elastically deform to resist the inner incision. However, the damage to the material is obvious, especially after multiple punctures, the material will be cut off, resulting in damage to the puncture window, which will affect its sealing performance and end its use early life.

For this reason, there are different technical solutions to obtain protection for the puncture window by changing the tip of the puncture needle. There are specific patents: the patent number is CN201380003571.4, and the patent number is CN201810323891.2. The needle is reversely bent and then forwardly bent to form a specific needle tip shape in which the blade surface of the outer cutting edge and the blade surface of the inner cutting edge of the puncture needle coincide with the axis of the puncture needle, so as to reduce the impact on the puncture during use. The degree of damage of the window; the latter discloses a special puncture needle in the form of a trocar, which protects the puncture window in the form of a sleeve.

Technical scheme of the present invention is specifically:

A puncture needle for an infusion port. The whole needle is in the cylindrical space wrapped by the outer surface of the puncture needle. The needle tube where the whole needle is located is a bent section. The axis is a curved axis, and the main blade surface is an annular plane. The closed figure formed by the outer contour of the main blade surface has no intersection with the puncture needle axis; the main blade surface and the puncture needle tube wall form two cutting edges: The cutting edge, the second cutting edge at the proximal end, the tip of the first cutting edge is the first tip, the middle of the second cutting edge is the second tip, the distance between the first tip and the second tip The radial distance d≤the wall thickness P of the needle tube.

The radial distance d is zero.

The first cutting edge is a three-edged edge, one side of which is the main edge surface, and the other two sides are two secondary edge surfaces. The two secondary edge surfaces are arranged on the left and right. The edge of the first cutting edge is formed at the junction of the blade surface and the main blade surface.

A puncture needle for an infusion port made by using the above-mentioned puncture needle for an infusion port, including a lower support, an upper support, a puncture needle, a connecting pipe and a hose; the lower support includes two upper and lower parts fixed together, and the lower part is the lower large The upper part is small cone-shaped, the upper part is a screw with external thread, and the middle is provided with a hole through the upper and lower sides; the upper support is a tube with internal thread, the upper part of which extends out to the side of the flat plate, and the upper surface of the flat plate is provided with a connecting pipe The groove between the center and the outside, the cross section of the groove is a circular arc, the upper support and the lower support are connected by threads; protruding inside, so that the needle of the puncture needle is exposed under the lower support, wherein the "axis of the puncture needle" in claim 1 is the axis of the front section of the axis of the puncture needle, and the aforementioned "needle as a whole is positioned at the center of the outer surface of the puncture needle." "Inside the wrapped columnar space" means "the needle as a whole is in the columnar space wrapped by the outer surface of the front section of the puncture needle"; the connecting tube is fixed in the groove, and the other end of the connecting tube is fixed to the flexible tube.

The connecting pipe is a medical plastic pipe.

The hose is a medical transparent tube.

The fixation between the puncture needle, the hose and the connecting tube is bonding.

The connecting pipe is bonded in the groove of the upper support.

Compared with the prior art, the technical effect of the present invention is that, due to the unique design of the present invention, the radial distance between the two blade tips is very small, and when the puncture needle punctures the septum, the trajectory of the two cutting blades is approximately One, to avoid the strip diaphragm, reducing the probability of the diaphragm being cut.

Description of drawings

Fig. 1 is a schematic diagram of a needle in the prior art.

Fig. 2 is an exploded schematic view of the present invention.

Fig. 3 is a schematic cross-sectional view of the present invention.

FIG. 4 is an enlarged schematic view of the needle in FIG. 2 .

FIG. 5 is an enlarged cross-sectional view of the needle in FIG. 2 .

Detailed ways

As shown in Figure 2-5, a puncture needle needle for infusion ports, the needle as a whole is in the columnar space wrapped by the outer surface of the puncture needle, the needle tube where the needle as a whole is located is a bent section 3A, and the bent section 3A faces the main blade surface of the needle 3C is bent on one side, and the axis of the bending section 3A is the bending axis 3B. The main edge surface 3C is similar to the edge surface of a common puncture needle, and is an annular plane (see Figure 4). The outer contour of the main edge surface 3C The resulting closed figure (similar to an ellipse) has no intersection with the puncture needle axis 30, which means that the main edge surface 3C is entirely on one side of the puncture needle axis 30, see FIG. 4 .

The main edge surface 3C should be flat in theory, but because the current processing technology is grinding wheel grinding, in fact, the inner side of the main edge surface is slightly concave, but it is also regarded as a plane in engineering. The meaning of "plane" in "the main edge surface 3C is an annular plane" includes an absolute plane and also includes an engineering plane.

The main edge surface 3C and the lancet tube wall form two cutting edges: the first cutting edge 3C1 at the distal end (similar to the outer cutting edge of the prior art), and the second cutting edge 3C2 at the proximal end (similar to the inner cutting edge of the prior art). ), the cutting edge of the first cutting edge 3C1 is the first cutting edge 3F (which is the farthest end of the outer cutting edge 51 in the background technology), and the edge of the second cutting edge 3C2 is the second cutting edge 3E (its Similar to the inner cutting edge 52 in the background technology), the radial distance d between the first blade tip 3F and the second blade tip 3E (that is, the distance between their projections on the needle tube section plane)≤needle tube The wall thickness P.

See Figure 5. When the puncture needle pierces the diaphragm, the distance between the trajectories of the two blade tips is very narrow. Because of the material, when the distance is narrow enough to a certain extent, the material cannot be cut, which avoids the appearance of a strip diaphragm and reduces the diaphragm. probability of being cut. Even if the material can be cut, compared with the prior art, the thickness of the strip-shaped diaphragm will be reduced, and the damage to the material will be reduced, which can prolong the service life of the diaphragm.

d is preferably zero. When the puncture needle punctures the septum, the trajectories of the two blade tips overlap into one, which avoids the occurrence of a strip-shaped septum and reduces the probability of the septum being cut.

Because the septum is relatively thick, as shown in Figure 1, the outer cutting edge 51 is bent, and the bent part forms a barb. If the barb is bent inward, the damage is less because of the protection of the needle tube; if the barb is bent inwardly and outwardly, because The protection of the needle tube is lost, and the damage is relatively large. In the needle of the present invention, the barb is formed at the first cutting edge 3C1, no matter the barb is bent inward or outward, it can be protected by the needle tube, and the damage will be small. From this point of view, the present invention also has progress.

In order to avoid the above-mentioned barbs, see Fig. 4, the first cutting edge 3C1 is a three-edged edge, one side of which is the main edge surface 3C, and the other two sides (the back of the main edge surface) are two secondary edge surfaces 3D, two The secondary blade surface 3D is set left and right (only one secondary blade surface 3D can be seen in Figure 4), the junction of the two secondary blade surfaces 3D forms the back edge 3D1, and the junction of the two secondary blade surfaces 3D and the main blade surface 3C forms First cutting edge 3C1. The 3D side of the secondary blade is also ground with a grinding wheel.

This triangular edge has stronger penetration and avoids barbs.

As shown in Fig. 2-3, a puncture needle for an infusion port made of the above-mentioned puncture needle for an infusion port includes a lower support 1, an upper support 2, a puncture needle 3, a connecting pipe 4 and a hose 5.

The lower support 1 includes upper and lower parts fixed together, the lower part is a tapered shape with a large lower part and a smaller upper part, and the upper part is a screw rod provided with an external thread 1A, and a hole through the upper part is provided in the middle of it.

The upper support 2 is a pipe with an internal thread 2B, and its upper section protrudes from the flat plate 2A to the side. The upper surface of the flat plate 2A is provided with a groove 2A1 connecting the center of the pipe and the outside world. The cross section of the groove 2A1 is a circular arc. The upper support 2 and Lower support 1 threaded connection.

The whole puncture needle 3 is bent at 90 degrees and L-shaped. One end of the connecting pipe 4 is fixed at its rear section (straight section), and its front section protrudes from the upper support 2 and the lower support 1, so that the needle head of the puncture needle 3 is exposed to the lower support. 1 below, wherein the "axis of the puncture needle" mentioned above is the "axis of the front section of the puncture needle", and the above-mentioned "the needle as a whole is in the columnar space wrapped by the outer surface of the puncture needle" means "the needle as a whole is in the center of the puncture needle". Inside the columnar space wrapped by the outer surface of the front section".

The connecting pipe 4 is a medical plastic pipe.

The flexible tube 5 is a medical transparent tube.

The fixation between the puncture needle 3, the flexible pipe 5 and the connecting pipe 4 is bonding.

The connecting pipe 5 is bonded in the groove 2A1 of the upper support 2 .

The inner thread of the upper support matches the outer thread of the lower support, and the exposed length of the needle head of the puncture needle 3 can be adjusted by rotation.

Its working principle is:

When needed, screw the upper support to adjust the exposed length of the needle of the puncture needle 3, and then make the lower support fit on the patient's skin surface. The subsequent use method is the same as the puncture needle for the existing infusion port, and will not be repeated here.

Other content joins prior art.

What has been described above is only the preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, some changes and improvements can be made without departing from the overall concept of the present invention, and these should also be regarded as the present invention. scope of protection.

Claims (8)

1. A puncture needle for an infusion port, characterized in that: the needle as a whole is in the cylindrical space wrapped by the outer surface of the puncture needle, the needle tube where the needle as a whole is located is a bent section (3A), and the bent section (3A) faces the needle One side of the main edge surface (3C) is curved, the axis of the bending section (3A) is the bending axis (3B), and the main edge surface (3C) is an annular plane, which is surrounded by the outer contour of the main edge surface (3C). The closed figure of has no intersection with the puncture needle axis (30); The main cutting edge (3C) and the needle tube wall form two cutting edges: the first cutting edge (3C1) at the distal end, the second cutting edge (3C2) at the proximal end, and the tip of the first cutting edge (3C1) is the second cutting edge One cutting edge (3F), the middle of the second cutting edge (3C2) is the second cutting edge (3E), the radial distance between the first cutting edge (3F) and the second cutting edge (3E) d≤ needle tube The wall thickness P. 2. The puncture needle head for an infusion port according to claim 1, wherein the radial distance d is zero. 3. The puncture needle head for infusion port according to claim 1, characterized in that: the first cutting edge (3C1) is a triangular edge, one side of which is the main edge surface (3C), and the other two sides are two secondary edges. Blade surface (3D), two secondary blade surfaces (3D) are arranged on the left and right, the junction of the two secondary blade surfaces (3D) forms the back edge (3D1), the two secondary blade surfaces (3D) and the main blade surface (3C) The junctions of both form the edge of the first cutting edge (3C1). 4. A puncture needle for an infusion port made of the puncture needle for an infusion port according to claim 1, comprising a lower support (1), an upper support (2), a puncture needle (3), and a connecting tube (4) and hose (5); The lower support (1) consists of upper and lower parts fixed together, the lower part is a cone with a large lower part and a smaller upper part, and the upper part is a screw with external thread (1A), and a hole through the upper and lower parts is provided in the middle; The upper support (2) is a pipe with an internal thread (2B), the upper part of which protrudes from the flat plate (2A) to the side, and the upper surface of the flat plate (2A) is provided with a groove (2A1) connecting the center of the pipe with the outside world, and the groove ( The section of 2A1) is a circular arc, and the upper support (2) and the lower support (1) are threaded; The puncture needle (3) is bent at 90 degrees (L) as a whole, one end of the connecting pipe (4) is fixed at its rear section, and its front section protrudes from the upper support (2) and the lower support (1), so that the puncture needle ( 3) The needle head is exposed under the lower support (1), wherein the "puncture needle axis" in claim 1 is the axis of the front section of the puncture needle axis, and the aforementioned "needle as a whole is wrapped on the outer surface of the puncture needle "Inside the columnar space" means "the whole needle is in the columnar space wrapped by the outer surface of the front section of the puncture needle"; The connecting pipe (4) is fixed in the groove (2A1), and the other end is fixed to the hose (5). 5. The puncture needle for infusion port according to claim 4, characterized in that: the connecting tube (4) is a medical plastic tube. 6. The puncture needle for infusion port according to claim 4, characterized in that: the flexible tube (5) is a medical transparent tube. 7. The puncture needle for infusion port according to claim 4, characterized in that: the fixation between the puncture needle (3), the hose (5) and the connecting pipe (4) is bonding. 8. The puncture needle for infusion port according to claim 4, characterized in that: the connecting tube (5) is bonded in the groove (2A1) of the upper support (2).