Dilator for umbilical vein puncture

Abstract

The present invention provides a dilator for umbilical vein puncture, comprising a handheld portion and a first extension piece, one end of the first extension piece is a first insertion section for inserting into the umbilical vein, and the other end is connected to the handheld portion, and the first insertion section has a structure with a gradually increasing radial dimension from the end away from the handheld portion to the direction connected to the handheld portion; a first insertion groove is provided on the first insertion section, which is used for inserting a cannula into the umbilical vein. The dilator for umbilical vein puncture provided by the present invention has a relatively small end of the insertion section for easy insertion into the umbilical vein, and then the structure with a gradually increasing radial dimension stretches the umbilical vein, and then the cannula is inserted into the umbilical vein along the first insertion groove, which greatly facilitates the operation of inserting the cannula into the umbilical vein, reduces the difficulty of the operation, and saves time.

Description

Technical Field

[0001] The invention relates to medical instruments, in particular to a dilator used for umbilical vein puncture. Background Art

[0002] Since the 1980s, umbilical vein catheterization has been one of the best routes for administering medication for neonatal asphyxia resuscitation. The umbilical vein has the advantages of a large lumen and a high success rate of the operation method. It can also be used to administer drugs, nutrient solutions, blood products, etc. to premature infants and extremely low birth weight infants.

[0003] In the prior art, when inserting a cannula into the umbilical vein, two hemostats or sterile forceps are used to lift the edge of the reserved umbilical cord to expose the umbilical vein and umbilical artery, and then the cannula is clamped by a pair of curved fine forceps, or the cannula is held and gently and slowly rotated to be inserted into the umbilical vein. The difficulty of this operation is that the wall of the umbilical vein is usually in a collapsed state, and there is no other assistance when inserting the cannula into the umbilical vein. If there is a slight deviation, the end of the cannula will squeeze the umbilical vein to cause it to collapse further and become impossible to insert. Therefore, it often takes repeated operations to insert the cannula into the umbilical vein. Summary of the invention

[0004] The purpose of the present invention is to provide a dilator for umbilical vein puncture to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A dilator for umbilical vein puncture, comprising:

[0007] Handheld part;

[0008] A first extension piece, one end of which is a first insertion section for inserting into the umbilical vein, and the other end of which is connected to the handheld part, and the first insertion section has a structure in which the radial dimension gradually increases from the end away from the handheld part to the direction in which the handheld part is connected;

[0009] The first insertion groove is arranged on the first insertion section and is used for inserting a cannula into the umbilical vein.

[0010] In the above-mentioned expander, the end of the first insertion section away from the hand-held part is an arc-shaped end.

[0011] In the above-mentioned expander, the arc-shaped end is inclined toward the central axis of the first insertion section.

[0012] In the above-mentioned expander, the radial cross-section of the first insertion section is an arc-shaped structure, and the inner side surface of the arc-shaped structure is the insertion groove.

[0013] The above expander further comprises:

[0014] A second extension piece, one end of which is a second insertion section for inserting into the umbilical artery, and the other end of which is connected to the handheld part, and the second insertion section has a structure in which the radial dimension gradually increases from the end away from the handheld part to the direction in which it is connected to the handheld part;

[0015] The second insertion groove is arranged on the second insertion section and is used for inserting a cannula into the umbilical artery.

[0016] The above-mentioned expander has friction patterns on the handheld portion.

[0017] In the above-mentioned expander, the first insertion section comprises a plurality of connection areas with successively increasing widths connected in sequence.

[0018] The expander comprises two L-shaped spring pieces, each of which comprises a vertical section and a horizontal section. The two spring pieces are connected at the top of the vertical section to form the hand-held part, and the horizontal sections of the two spring pieces are the first extension pieces.

[0019] The first insertion groove is formed between the two horizontal sections.

[0020] In the above-mentioned expander, a resistance portion is arranged on the outer wall of the horizontal section.

[0021] In the above-mentioned expander, the depth of the inner groove is one third to two thirds of the length of the horizontal section.

[0022] In the above-mentioned expander, when the two spring sheets are in contact with each other, the first insertion groove is an inverted tapered groove.

[0023] In the above-mentioned expander, the vertical section includes a first section and a second section, the width of the first section is greater than that of the second section, a hand-held friction portion is provided on the first section, and the second section is connected to the horizontal section.

[0024] In the above-mentioned expander, the resistance portion is a wavy outer wall surface.

[0025] In the above-mentioned expander, the right end of the horizontal section is arc-shaped.

[0026] In the above technical solution, the dilator for umbilical vein puncture provided by the present invention has a relatively small end of the insertion section for easy insertion into the umbilical vein, and then the structure with gradually increasing radial dimensions stretches the umbilical vein, and then the cannula is inserted into the umbilical vein along the first insertion groove, which greatly facilitates the operation of inserting the cannula into the umbilical vein, reduces the difficulty of the operation, and saves time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0028] Figure 1 A schematic diagram of the structure of an expander provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the structure of a dilator provided in another embodiment of the present invention;

[0030] Figure 3 A partial side view of a dilator provided in accordance with another embodiment of the present invention;

[0031] Figure 4 A partial front view of a dilator provided in yet another embodiment of the present invention;

[0032] Figure 5 for Figure 4 AA section view in;

[0033] Figure 6 A radial cross-sectional view of a first extension member provided in yet another embodiment of the present invention;

[0034] Figure 7 A schematic structural diagram of a dilator provided in yet another embodiment of the present invention;

[0035] Figure 8 A schematic structural diagram of a dilator provided in yet another embodiment of the present invention;

[0036] Fig. 9 A schematic structural diagram of a dilator provided in yet another embodiment of the present invention;

[0037] Fig.10 for Fig. 9 AA section view in;

[0038] Fig.11 A schematic structural diagram of an expander in an open state provided by another embodiment of the present invention;

[0039] Fig.12 A schematic structural diagram of a dilator in a closed state provided in yet another embodiment of the present invention.

[0040] Description of reference numerals:

[0041] 1. Hand-held part; 1.1. First section; 1.2. Second section; 2. First extension piece; 2.1. First insertion section; 2.11. Arc-shaped end; 3. First insertion slot; 4. Second extension piece; 5. Second insertion slot; 6. Resistance part. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0043] In the various embodiments of the present invention, the directional words such as vertical, horizontal, left, right, top, bottom, etc. are based on the convenience of description. They are the directional relationships of the various structures provided by the present invention, such as the springs, in specific forms, rather than being limitations on the positions in any state, and certainly not being absolute limitations on the claims. More specifically, it refers to the positional relationship when the spring provided by the present invention has two arms of different lengths, and the longer of the two arms is placed vertically or substantially vertically, and the shorter end is placed horizontally or substantially horizontally, and the overall shape appears to be L-shaped. Vertical, horizontal, left, right, top, and bottom are only for this positional relationship. In this way, if it is rotated 90 degrees and flipped at this position, it forms Figure 7 The vertical section is placed horizontally, and the horizontal section is placed vertically, and the positional relationship is changed accordingly. This is common sense in daily life and will not be elaborated.

[0044] like Figure 1-12 As shown, an embodiment of the present invention provides a dilator for umbilical vein puncture, comprising a handheld portion 1 and a first extension piece 2, wherein one end of the first extension piece 2 is a first insertion section 2.1 for inserting into the umbilical vein, and the other end is connected to the handheld portion 1, and the first insertion section 2.1 is a structure with a radial dimension gradually increasing from the end away from the handheld portion 1 to the direction connected to the handheld portion 1; a first insertion groove 3 is provided on the first insertion section 2.1, which is used for inserting a cannula into the umbilical vein.

[0045] Specifically, the hand-held portion 1 is used for hand-holding, and is a structure that can be held by hand, such as a handle-shaped structure. The first extension piece 2 is used to insert into the umbilical vein and expand it to a certain extent. Here, expansion refers to opening the umbilical vein (the umbilical vein is usually in a collapsed state). One end of the first extension piece 2 is a first insertion section 2.1, and the other end is connected to the hand-held portion 1. The first insertion section 2.1 is a section inserted into the umbilical vein. From the end (i.e., the end away from the hand-held portion 1) to the connecting end (i.e., the end connected to the hand-held portion 1), the radial dimension gradually increases. That is, the end is relatively small and the connecting end is relatively wide. Its function is that the small end can be easily inserted into the umbilical vein, and as it is inserted, the wide part enters the umbilical vein to force the umbilical vein from a collapsed state to an open state. Preferably, the width of the end is 2 mm, the width of the connecting end is 4 mm, and the middle part has a smooth transition.

[0046] In this embodiment, Figure 1 and 7 As shown, preferably, the first insertion section 2.1 includes a plurality of connection areas with increasing widths connected in sequence to form a structure with gradually increasing radial dimensions. The widths of the umbilical veins of newborns of different weights are different, and connection areas of different widths are adapted to umbilical veins of different diameters. During the insertion process, the depth of the dilator insertion is adjusted according to the dilation effect of the umbilical vein.

[0047] In this embodiment, the first insertion section 2.1 can be a flat plate structure, such as a long strip, with a conical structure at its end, but preferably, the first insertion section 2.1 is an arc-shaped plate, where the radial dimension refers to the maximum dimension on both sides of the arc. The arc-shaped plate can better open the umbilical vein.

[0048] In this embodiment, the first insertion section 2.1 is also provided with a first insertion groove 3, which is arranged along the first insertion section 2.1, and the two extend in the same direction. The first insertion groove 3 is used for inserting the cannula of the umbilical vein. When the first insertion section 2.1 is a flat plate, the first insertion groove 3 is a groove-shaped structure opened on the first insertion section 2.1. When the first insertion section 2.1 is an arc-shaped plate, the first insertion groove 3 is a space naturally formed on the inner side of the arc-shaped plate.

[0049] In this embodiment, the hand-held portion 1 is provided with friction patterns, so as to increase the friction force when holding the hand.

[0050] When in use, during surgery, after the edge of the reserved umbilical cord is lifted with hemostatic forceps or sterile tweezers to expose the umbilical vein and umbilical artery, the doctor holds the dilator with the handheld portion 1, inserts the first insertion section 2.1 from the end into the umbilical vein, and opens the umbilical vein through the first insertion section 2.1, then slightly tilts the first insertion section 2.1, and inserts the umbilical vein cannula into the umbilical vein in accordance with the first insertion groove 3 on the first insertion section 2.1. When the end of the cannula is inserted into the umbilical vein to a certain depth, the power for inserting the first insertion section 2.1 into the umbilical vein can be manual pressure, or the first insertion section 2.1 can be configured to be heavier and inserted naturally by gravity, or both, such as when it is 1 cm, the dilator is pulled out, and the subsequent insertion of the cannula is the same as the prior art, which will not be repeated.

[0051] The dilator for umbilical vein puncture provided in an embodiment of the present invention has a relatively small end portion of the insertion section for easy insertion into the umbilical vein, and then the structure with gradually increasing radial dimensions stretches the umbilical vein, and then the cannula is inserted into the umbilical vein along the first insertion groove 3, which greatly facilitates the operation of inserting the cannula into the umbilical vein, reduces the difficulty of the operation, and saves time.

[0052] In another embodiment provided by the present invention, preferably, the end of the first insertion section 2.1 away from the handheld portion 1, i.e., the end for insertion, is an arcuate end 2.11, and the arcuate end 2.11 reduces damage to the umbilical vein and reduces the probability of damage to the umbilical vein by the first insertion section 2.1.

[0053] In another embodiment provided by the present invention, further, Figure 2 As shown, the arcuate end 2.11 is inclined toward the central axis of the first insertion section 2.1. Here, the central axis refers to the center line of the cylinder where the arcuate structure is located when the first insertion section 2.1 is an arcuate structure, that is, the outer wall surfaces of the upper and middle parts of the first insertion section 2.1 are on the same cylindrical surface, and the arcuate end 2.11 area of ​​the lower part is located on the inner side of the cylindrical surface. The effect of such a setting is that the first insertion section 2.1 can rely on the arcuate end 2.11 to insert into the central area of ​​the umbilical vein. During the insertion process of the first insertion section 2.1, the arcuate end 2.11 is located in the central area of ​​the umbilical vein without fitting or abutting against the inner wall of the umbilical vein. The arcuate end 2.11 is relatively sharp and is located in the central area of ​​the umbilical vein to reduce the probability of possible damage to the umbilical vein.

[0054] In various embodiments of the present invention, Figure 4-6 As shown, preferably, the radial cross-section of the first insertion segment 2.1 is an arc-shaped structure, the inner side of the arc-shaped structure is the insertion groove, and optionally, the central angle of the arc-shaped structure can be less than, equal to or greater than 180 degrees, that is, it can be less than, equal to or greater than a semicircle.

[0055] In another embodiment provided by the present invention, further, Figure 7 As shown, the second extension piece 4 is also included. One end of the second extension piece 4 is a second insertion section for inserting into the umbilical artery, and the other end is connected to the handheld part 1. The second insertion section is a structure with a gradually increasing radial size from the end away from the handheld part 1 to the direction connected to the handheld part 1. The second insertion groove 5 is provided on the second insertion section, which is used for inserting the cannula of the umbilical artery. The second extension piece 4 and the first extension piece 2 are arranged in two different directions of the handheld part 1. The difference between the two in structure and function is only that the first extension piece 2 is used for inserting and expanding the umbilical vein, and the second extension piece 4 is used for inserting and expanding the umbilical artery. Since the size of the umbilical artery is small, the size of the second extension piece 4 is also relatively small. In addition, the rest of the structures of the two can be directly referenced.

[0056] In the above embodiments, the first extension member 2 is a single structure, such as a plate. Figure 9-11 As shown, another different bending and different structural idea is provided, the expander includes two L-shaped spring pieces, the two spring pieces are connected at the top of the L-shaped vertical section to form the hand-held part 1, the L-shaped horizontal sections of the two spring pieces are the first extension piece 2; the first insertion slot 3 is formed between the two horizontal sections. That is, the two vertical sections form the hand-held part 1, the two horizontal sections form the first extension piece 2, and the first insertion slot 3 is the space formed between the two horizontal sections.

[0057] Specifically, the spring sheet can be a metal sheet or a plastic sheet. The elasticity of the spring sheet refers to the fact that in a natural state without any other external force but only gravity, one end of the two spring sheets is connected and the other end is naturally open, forming the state shown in the figure. When pressure is applied to the other end, the other ends of the two spring sheets can be closed to form Fig.11 When the applied pressure disappears, the spring is Fig.12 The closed state naturally returns to Fig.11 The open state is the so-called elasticity of the shrapnel.

[0058] In this embodiment, the L-shape and the vertical and horizontal segments should be understood in a broad sense, that is, basically L-shaped, vertically positioned and horizontally positioned. More specifically, the angle between the two segments of the L-shape can be between 85-95 degrees, or even between 80-100 degrees. Roughly L-shaped meets the requirements.

[0059] In this embodiment, the vertical section is longer and is the hand-held part 1 for the doctor to hold. The horizontal section is shorter and is the first extension part 2 for inserting into the umbilical vein of the newborn. The resistance part 6 is a structure for increasing friction, such as a corrugated structure, a protrusion structure or a groove structure, etc.

[0060] When the dilator provided in this embodiment is used, the doctor first holds and presses the vertical section to close the two spring pieces, then inserts the horizontal section into the umbilical vein with the help of the hand, and then releases the pressure on the vertical section, so that the two spring pieces open naturally, and the horizontal section also opens to open the umbilical vein. At this time, an open space is formed between the two horizontal sections at the L-shaped bend, which is the first insertion slot 3. The open space is for observation. Fig.11 As shown, it is also the insertion channel of the cannula for inserting the cannula. Moreover, due to the effect of the resistance part 6, there is a certain friction between the horizontal section and the umbilical cord, which can better maintain the open position of the horizontal section in the umbilical vein.

[0061] The dilator for umbilical vein puncture provided in an embodiment of the present invention is such that during surgery, the horizontal section of the L-shaped spring piece is inserted into the umbilical vein, and the umbilical vein is naturally opened by relying on the elastic force and the size change of the horizontal section. The doctor can insert the cannula through the first insertion groove 3 between the two spring pieces. Opening the umbilical vein from the inside is not only convenient to operate, but also safe and reliable, and will not damage the umbilical vein.

[0062] In another embodiment provided by the present invention, preferably, an inner groove is provided on the inner side wall of the left end of the horizontal segment, and the depth direction of the inner groove is consistent with the length direction of the horizontal segment, that is, when the horizontal segment is inserted into the umbilical cord and opened, the two inner grooves form a larger first insertion groove 3 for operation and observation, which facilitates the operation of cannula insertion.

[0063] In this embodiment, the depth of the first insertion groove 3 can be the same or substantially the same as the length of the horizontal section, that is, the first insertion groove 3 completely covers the horizontal section, and the insertion and observation of the cannula are relatively convenient. However, the outer wall of the horizontal section is generally in a raised cylindrical shape, which increases the difficulty of inserting the cannula into the umbilical vein. Therefore, preferably, the depth of the first insertion groove 3 is one-third to two-thirds of the length of the horizontal section, that is, the portion of the horizontal section where the first insertion groove 3 is not provided is relatively flat and narrow, so that it is convenient to insert the cannula into the umbilical vein, and the portion where the first insertion groove 3 is provided is located on the outside of the umbilical cord, which is opened to increase the field of view and operating space.

[0064] More preferably, when the two spring sheets are fitted together, the first insertion groove 3 formed by the two inner grooves connecting with each other is an inverted conical groove, such as an inverted circular cone groove, and the groove body with gradually decreasing size facilitates the spatial arrangement of the horizontal section.

[0065] In another embodiment provided by the present invention, preferably, the vertical section includes a first section 1.1 and a second section 1.2, the width of the first section 1.1 is greater than that of the second section 1.2, a hand-held friction portion is provided on the first section 1.1, and the second section 1.2 is connected to the horizontal section. The first section 1.1 is used for hand-holding, and its larger width improves the hand feel, and the hand-held friction portion improves the hand-holding friction force, making it easier to hold.

[0066] In another embodiment provided by the present invention, preferably, the resistance portion 6 is a wavy outer wall surface, and the wavy outer wall surface is relatively smooth, which is convenient for insertion and can increase a certain resistance.

[0067] In another embodiment provided by the present invention, preferably, the right end of the horizontal segment is arc-shaped, which is also the end of the horizontal segment for inserting into the umbilical vein. The cylindrical structure can reduce the damage of the horizontal segment to the umbilical vein.

[0068] Furthermore, the outer wall surface of the right end of the horizontal section is arc-shaped, and the curvature of the arc is consistent or substantially consistent with the curvature of the inner hole when the umbilical vein is opened, so that the opening of the umbilical vein is more natural and smooth.

[0069] Furthermore, the horizontal section can be divided into four parts from left to right, with inner grooves set in the two left parts, and outer walls of the two right parts being arc-shaped and flat respectively, wherein the arc-shaped part is located between the flat part and the inner groove part, that is, the flat section is located at the rightmost end, so that the flat section can facilitate the insertion of the horizontal section, and the arc-shaped section can naturally open the umbilical vein, killing two birds with one stone.

[0070] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A dilator for umbilical vein puncture, characterized in that: include: Handheld part; A first extension piece, one end of which is a first insertion section for inserting into the umbilical vein, and the other end of which is connected to the handheld part; A first insertion groove, which is provided on the first insertion section and is used for inserting a cannula into the umbilical vein; The expander comprises two L-shaped spring pieces, the two spring pieces are connected at the top of the L-shaped vertical section to form the hand-held part, the L-shaped horizontal sections of the two spring pieces are the first extension pieces; the first insertion slot is formed between the two horizontal sections; One end of the two springs is connected, and the other end is naturally open. When pressure is applied to the other end, the other ends of the two springs close together; An inner groove is provided on the inner side wall of the left end of the horizontal section, the depth direction of the inner groove is consistent with the length direction of the horizontal section, and when the two spring pieces are closed, the first insertion groove formed by the two inner grooves butting against each other is an inverted tapered groove; The right end of the horizontal segment is arc-shaped, and the end is the end of the horizontal segment for inserting into the umbilical vein; the outer wall surface of the right end of the horizontal segment is arc-shaped; The depth of the first insertion groove is one third to two thirds of the length of the horizontal section, and the portion provided with the first insertion groove is located outside the umbilical cord; The first insertion section has a resistance portion for increasing friction.

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