CN216365208U - Hypodermic needle and hypodermic traction assembly - Google Patents

Abstract

The utility model relates to a hypodermic needle having a distal end that is further from the operator in use and a proximal end that is closer to the operator in use, characterized in that it comprises: a connection section via which a hypodermic needle can be connected to a device to be towed; a handle section disposed distally of the connecting section, the handle section being for grasping by an operator and the handle section being arcuately curved over at least a portion of its length; a spike section disposed at a distal end of the hypodermic needle, the spike section having a main body portion and an edge portion, the edge portion facing outward, i.e., away from an operator, when in use. The beneficial effects are that, be difficult to accidentally injure operating personnel and can avoid tissues such as blood vessel when using. The utility model also relates to a subcutaneous traction assembly.

Description

Hypodermic needle and hypodermic traction assembly

Technical Field

The utility model relates to the field of surgical seepage drainage, in particular to a subcutaneous traction needle and a subcutaneous traction assembly.

Background

In departments such as neurosurgery, general surgery, thoracic surgery, bone surgery, cardiovascular surgery, thyroid surgery and the like, a drainage catheter is required to be placed for draining and emptying fluids such as subcutaneous wound exudate, hematocele, cerebrospinal fluid, pus and the like during operation of a patient, so that the infection probability of the patient is reduced, and the rapid healing of an incision is promoted. This requires the use of a hypodermic needle that places the drainage catheter into the subcutaneous tissue.

The currently common hypodermic needle generally has a cutting edge facing the inside, i.e. facing the operator, a straight shank and a small elevation (pinch) angle of the cutting edge compared with the shank. In the using process of the subcutaneous traction needles, the defects that the inner diameter of the skin and the subcutaneous stoma is larger, more bleeding occurs, a gap is formed between the subcutaneous traction needles and a drainage catheter (the gap causes poor sealing and easy infection, and the retention time of the drainage catheter is short), needle supplementing and sewing are needed after the catheter is placed, the running path of the traction needles is not easy to control, and the subcutaneous traction needles are longer and farther are generally existed.

SUMMERY OF THE UTILITY MODEL

The present invention aims to provide a hypodermic needle and a hypodermic traction assembly which solve at least one of the above mentioned problems.

In order to achieve the above object, the present invention proposes a hypodermic needle having a distal end which is further away from the operator in use and a proximal end which is closer to the operator in use, characterized in that it comprises:

a connection section via which a hypodermic needle can be connected to a device to be towed;

a handle section disposed distally of the connecting section, the handle section being for grasping by an operator and the handle section being arcuately curved over at least a portion of its length; and

a spike section disposed at a distal end of the hypodermic needle, the spike section having a main body portion and an edge portion, the edge portion facing outward, i.e., away from an operator, when in use.

The hypodermic needle of the present invention has the beneficial effects that, but not limited to, the blade is designed to face outward, i.e., away from the operator when in use, so that the operator is not easily injured by mistake. Based on the arcuate curvature of the handle section, the operator can control the penetration and stick-out at different locations and different azimuthal paths within the subcutaneous tissue to avoid blood vessels and control optimal path of travel of the drainage catheter.

Advantageously, the hypodermic needle further comprises a transition section disposed between the shank section and the spike section.

Advantageously, the connecting section has a cylindrical proximal section and a distal section, and the cross-sectional dimension of the proximal section is larger than the cross-sectional dimension of the distal section.

Advantageously, the connecting section is provided with a flange in its circumference, or the connecting section tapers from the proximal end to the distal end, or the connecting section has a plurality of successive tapering structures tapering from the distal end to the proximal end.

Advantageously, the shank section is curved in an arc over a substantial part of its length.

Advantageously, the shank section is arcuately curved over its entire length.

Advantageously, the blade is formed by two faces that intersect each other, said faces being directed towards the outside in use, i.e. away from the operator.

Advantageously, the blade portion has a cutting edge, and a portion of the cutting edge adjacent to the main body portion forms a passivation portion.

Advantageously, the blunting is formed by rounding or mechanically smoothing or applying a coating to the portion of the cutting edge.

Advantageously, the transition section is arcuately curved.

Advantageously, the curvature of the transition section is greater than the curvature of the shank section.

Advantageously, a line passing through the proximal end point of the handle section and the distal end point of the transition section forms an angle with the central axis of the line of the spike section of more than 70 °.

Advantageously, the proximal end of the proximal section is chamfered or rounded, and/or the distal end of the proximal section transitions at right angles.

The utility model also provides a subcutaneous traction assembly, characterized in that it comprises a subcutaneous traction needle according to the utility model and comprises a device to be traction, the subcutaneous traction needle being connectable with its connection section to the device to be traction.

Advantageously, the device to be towed is a drainage catheter.

Advantageously, the connecting section of the hypodermic needle is connected with the device to be retracted in an interference fit.

Drawings

The utility model is explained in more detail below with reference to the drawings by means of embodiments, which are not, however, restricted to the embodiments described in the drawings and explained in detail below. The attached drawings are as follows:

FIG. 1 is a schematic perspective view of a hypodermic needle in accordance with one embodiment of the utility model;

FIG. 2 is a schematic side view of the hypodermic needle of FIG. 1;

FIG. 3 is a top view of the hypodermic needle of FIG. 1;

FIG. 4 is an enlarged view of portion I of the hypodermic needle of FIG. 3;

FIG. 5 is a schematic side view of a subcutaneous distraction assembly in accordance with an embodiment of the utility model;

figure 6 is a schematic top view of the subcutaneous distraction assembly of figure 5.

Detailed Description

Illustrative embodiments of hypodermic needle 1 and hypodermic traction assembly 2 of the present invention are described below. In the description, various systems, structures and devices are schematically depicted in the drawings for purposes of explanation only and not all features of an actual system, structure or device, such as a well-known function or structure, are not described in detail to avoid obscuring the present invention in unnecessary detail. It will of course be appreciated that in the development of any such actual implementation, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such implementation decisions, while complex and time consuming, are nevertheless routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.

The terms and phrases used herein should be understood and interpreted to have a meaning consistent with the understanding of those terms and phrases by those skilled in the relevant art. No special definition of a term or phrase, i.e., a definition that is different from the ordinary and customary meaning as understood by those skilled in the art, is intended to be implied by consistent usage of the term or phrase herein. To the extent that a term or phrase is intended to have a special meaning, i.e., a meaning other than that understood by skilled artisans, such a special definition will be expressly set forth in the specification in a definitional manner that directly and unequivocally provides the special definition for the term or phrase.

Throughout the following description, unless the context requires otherwise, the words "comprise", "comprising", and variations thereof, such as "comprises", "comprising", and "having", will be interpreted in an open, inclusive sense, i.e., as "including but not limited to".

A hypodermic needle 1 and a hypodermic pulling assembly 2 according to one embodiment of the utility model will now be exemplified with reference to fig. 1 to 6.

Fig. 1 to 4 show an embodiment of a hypodermic needle 1 of the utility model. The hypodermic needle 1 can be made of a rigid material, such as medical grade stainless steel, and can be constructed solid. The hypodermic needle 1 may have a distal end or distal side that is further from the operator (doctor or assistant) when in use and a proximal end or proximal side that is closer to the operator when in use.

The hypodermic needle 1 can have a proximal connecting section 3, by means of which connecting section 3 the hypodermic needle 1 can be connected to a device to be pulled, for example a drainage catheter 4 (see fig. 5 and 6). The connecting section 3 may have a cylindrical proximal section 5 and a distal section 6. The proximal section 5 may have a larger cross-sectional dimension (or diameter) than the distal section 6, thereby forming a stepped transition surface 7 therebetween. This transition surface 7, which constitutes the distal end surface of the proximal section 5, may face the distal section 6.

The cross-sectional dimension of the proximal section 5 can be greater than the inner diameter of the drainage catheter 4 to be connected, so that an elastic drainage catheter 4, for example made of silicone, can be fitted over the proximal section 5 with an interference fit. The drainage catheter 4 can extend over at least a part of the distal section 6 beyond the proximal section 5, whereby the drainage catheter 4 can rest against the transition surface 7 on account of the smaller inner diameter of the drainage catheter 4 at the distal section 6 compared to the proximal section 5, so that the connection is more secure. The cross-sectional dimension of the distal section 6 can also be larger than the inner diameter of the drainage catheter 4 to be connected, so that the drainage catheter 4 can also be fitted over the proximal section 5 with an interference fit, thereby further increasing the security of the connection.

In some embodiments, the proximal section 5 may have a cross-sectional dimension equal to the cross-sectional dimension of the distal section 6 and greater than the inner diameter of the drainage catheter 4 to be connected, and at least one flange may be provided on the circumference of the connecting section 3, which may increase the security of the connection. In some embodiments, the connecting section 3 may be configured to taper from the proximal end to the distal end, and the thinnest portion of the connecting section 3 is larger than the inner diameter of the drainage catheter 4 to be connected, which tapered reverse taper structure may also further increase the robustness of the connection. In some embodiments, the connecting section 3 may have a plurality of successive tapered structures tapering from the distal end to the proximal end to further increase the robustness of the connection. Suitable combinations of the above embodiments are also conceivable.

Referring to the enlarged detail of the connecting section 3 shown in fig. 4, the transition from the circumference of the proximal section 5 to the distal end surface or transition surface 7 may be a right angle, i.e. not rounded or chamfered, in order to more securely fix the drainage catheter 4.

Referring to fig. 2, the proximal section 5 and the distal section 6 of the connecting section 3 may have a common central axis. The common central axis may be a straight line, which facilitates nesting of the drainage catheter 4 thereon. Curved connecting sections 3 are also conceivable in other embodiments.

The hypodermic needle 1 may have a handle section 8 for gripping by an operator in use, which handle section 8 may be disposed distally of the connecting section 3 and may be adjacent to the distal end of the connecting section 3. The length of the handle section 8 may be much greater than the length of the connection section 3, for example more than 4 times greater. The shank section 8 may have a circular uniform cross section in its longitudinal direction. The cross-sectional dimension of the handle section 8 may be larger than the cross-sectional dimensions of the distal section 6 and the proximal section 5 of the connection section 3. In the case of a drainage catheter 4 fitted on the connecting section 3, the cross-sectional dimension of the shaft section 8 can be smaller than or equal to the outer diameter of the expanded drainage catheter 4 on the connecting section 3. Based on the elasticity of the skin and subcutaneous tissue, the drainage catheter 4 can smoothly pass through the skin and subcutaneous tissue following the handle section 8. In this embodiment, the handle section 8 may have an arcuately curved shape over its entire length in its longitudinal direction. In other embodiments, the shank segment 8 may be arcuately curved in its longitudinal direction only over part of its length, for example over a majority of its length. The longer handle section 8 can thus pass through the subcutaneous tissue of the body smoothly during use and avoid blood vessels and the like.

The hypodermic needle 1 can have a transition section 9, which transition section 9 can adjoin with its proximal end to the distal end of the shank section 8. The transition section 9 may have a circular uniform cross section in its longitudinal direction. The cross-sectional dimension of the transition section 9 may be equal to the cross-sectional dimension of the shank section 8. The length of the transition section 9 may be much smaller than the length of the shank section 8. The transition section 9 may have an arcuately curved shape and may have the same direction of curvature as the shank section 8. The degree of curvature or curvature of the transition section 9 can be different from, in the present exemplary embodiment, greater than, the degree of curvature or curvature of the shank section 8. The arcuate curved configuration of the transition section 9 may allow it to pass smoothly through the subcutaneous tissue of the body in use. The curvature of the transition section 9 can be preset according to specific requirements.

The hypodermic needle 1 may have a piercing section 10, and the piercing section 10 may pierce and pierce human skin and subcutaneous tissue. The spike section 10 may adjoin with its proximal end the distal end of the transition section 9. The spike section 10 may have a straight central axis. Of course curved central axes are also conceivable in other embodiments. The spike section 10 may have a generally cylindrical body portion 11 and a wedge-shaped blade portion 12 distal to the body portion 11. The blade 12 may be used to sever body tissue, such as skin and subcutaneous tissue. The wedge-shaped edge 12 may be formed by two surfaces 13, e.g. flat or curved, which intersect each other. The two faces 13 may be directed outwards, i.e. away from the operator in use. These two faces 13 may be mirror-symmetrical with respect to a plane passing through the entire central axis of the hypodermic needle 1. The wedge-shaped blade 12 may have a cross-sectional dimension that tapers from its proximal end to its distal end, and forms a sharp point at its distal end. The intersection of these two faces 13 may form the cutting edge 14 of the blade 12. When the two faces 13 are planar, the cutting edge 14 may be linear. And when the two faces 13 are curved, the cutting edge 14 may be curved. The cutting edge 14 may extend proximally from the distal tip of the lancing section 10 to the body portion 11 of the lancing section 10. The blade 12 or the cutting edge 14 can also be directed outwards, i.e. away from the operator during use, on the basis of the two outwardly directed faces 13, whereby the operator can be protected against accidental injury.

A portion of the cutting edge 14 adjacent to the body portion 11 may be blunted, for example by rounding or mechanical smoothing or applying a coating or the like, which portion may thus constitute the blunted portion d. The blunt d does not cut body tissue when in use, but only the portion of the cutting edge 14 distal to the blunt d. Thus, the puncture opening and the puncture outlet (i.e., skin laceration) on the human tissue and the subcutaneous tunnel caused by the hypodermic needle 1 can be smaller in size than without the blunted portion d. This is advantageous because a smaller skin breach can wrap the drainage catheter 4 tighter, so that seepage from the human body cannot seep out of the gap between the drainage catheter 4 and the skin breach, and bacteria outside the human body cannot enter the human body from the gap to cause infection. The blood vessel beside the subcutaneous tunnel can be pressed by the drainage catheter 4 to stop bleeding. The bluff portion d may occupy a small proportion of the edge 14, for example, its length may be less than or equal to half the length of the edge 14, 1/3, 1/4, 1/5, or 1/10.

The degree of curvature of the handle section 8 and the transition section 9 may be such that a straight line passing through the proximal end point of the handle section 8 and the distal end point of the transition section 9 may form an angle α of more than 70 ° with the central axis of the spike section 10. Due to the curved curvature of the shank portion 8 and the transition portion 9, the transition of the connecting portion 3 to the shank portion 8 and the transition of the transition portion 9 to the spike portion 10 can be smoother; on the other hand, the angle α larger than 70 ° can make the entire hypodermic needle 1 substantially have an approximate circular arc shape as a whole, such as 1/4 circular arc, so that the entire hypodermic needle 1 can pass through the human tissue more smoothly; in yet another aspect, the operator can easily select the puncture site, and subcutaneous tunnel location, and can selectively avoid blood vessels, etc.

Figures 5 and 6 illustrate one embodiment of a subcutaneous retraction assembly 2. The subcutaneous distraction assembly 2 can include a subcutaneous distraction needle 1 and a drainage catheter 4. The drainage catheter 4 can have an introduction section 15 with drainage holes on its peripheral surface for introducing the exudate into it and an exit section 16 for subsequent connection to a drainage system (not shown) for exiting the exudate. The lead-out section 16 may be cylindrical and the lead-in section 15 may have a flat (in this embodiment), round or cross-shaped cross-section, etc. During cannulation, the drainage catheter 4 can be connected with its outlet section 16 to the connection section 3 of the hypodermic needle 1 by interference fit. The associated drainage catheter 4 can be guided through the subcutaneous tissue of the human body by the subcutaneous needle 1 until a sufficient length of the insertion section 15 and a small portion of the removal section 16 are located in the subcutaneous tissue of the human body. A portion of the exit section 16 of the drainage catheter 4 is removed outside the puncture opening together with the hypodermic traction needle 1 and a portion of the exit section 16 is left for subsequent connection to a drainage system for drainage. The removed hypodermic needle 1 can be discarded for hygienic reasons, i.e., the hypodermic needle 1 is disposable. But does not preclude reuse after proper sterilization.

Therefore, the main technical effects that can be achieved by the hypodermic needle 1 and the hypodermic pulling assembly 2 of the present invention are, for example, that there is little skin incision based on the dulled portion d of the cutting edge 14, and thus there is little damage to human tissues and skin and little postoperative scarring. In addition, the probability that the skin laceration and the subcutaneous tunnel can damage the blood vessel is small, and the human tissue and the subcutaneous indwelling drainage catheter 4 form pressure holding, so that the blood vessel is pressed to stop bleeding, and bleeding is very little. No gap is left between the drainage catheter 4 and the skin laceration, and the laceration is sealed, so that the seepage in the body cannot seep out of the dressing, the bacteria can be prevented from invading subcutaneous tissues, and the infection probability is reduced. After the drainage catheter 4 is pulled out, the human tissue and the skin are lacerated and naturally contracted, bleeding is not easy to occur, and the suture is simple and even does not need to be sutured.

The blade 12 or edge 14 is designed to face outwardly, i.e., away from the operator, when in use, and is therefore less prone to accidental injury to the operator.

Due to the curved curvature of the shank section 8 and the transition section 9, on the one hand, the transition between the sections of the hypodermic needle 1 can be smoother; on the other hand, the angle α larger than 70 ° enables the entire hypodermic needle 1 to have a substantially circular arc shape as a whole, so that the entire hypodermic needle 1 can pass through the subcutaneous tissue of the human body more smoothly; on the other hand, the operator can completely control the puncture and the puncture at different positions and different azimuth paths in the subcutaneous tissue so as to avoid the tissues such as blood vessels and control the optimal path for the drainage catheter 4 to run.

Due to the different cross-sectional dimensions of the proximal section 5 and the distal section 6 of the connecting section 3 and the suitable rounding or chamfering, a secure connection can be ensured while protecting the connected drainage catheter 4.

Finally, it is noted that the above-mentioned embodiments are only for understanding and explaining the present invention, and do not limit the scope of the present invention. It will be apparent to those skilled in the art that modifications may be made in the foregoing embodiments, all without departing from the scope of the utility model.

Claims (16)

1. A hypodermic needle having a distal end that is further from an operator in use and a proximal end that is closer to the operator in use, the hypodermic needle comprising:

a connection section via which a hypodermic needle can be connected to a device to be towed;

a handle section disposed distally of the connecting section, the handle section being for grasping by an operator and the handle section being arcuately curved over at least a portion of its length; and

a spike section disposed at a distal end of the hypodermic needle, the spike section having a main body portion and an edge portion, the edge portion facing outward, i.e., away from an operator, when in use.

2. The hypodermic needle of claim 1, further comprising a transition section disposed between the shank section and the spike section.

3. The hypodermic needle of claim 1 or 2, wherein the connecting section has a cylindrical proximal section and a distal section, and the proximal section has a cross-sectional dimension that is greater than the cross-sectional dimension of the distal section.

4. Hypodermic needle according to claim 1 or 2, wherein the connecting section is provided with a flange in its circumference, or the connecting section tapers from the proximal end to the distal end, or the connecting section has a plurality of successive tapering structures tapering from the distal end to the proximal end.

5. The hypodermic needle of claim 1 or 2, wherein the shank section is arcuately curved over a majority of its length.

6. The hypodermic needle of claim 1 or 2, wherein the shank section is arcuately curved over its entire length.

7. Hypodermic needle according to claim 1 or 2, wherein the blade is formed by two faces that intersect each other, which faces outwards in use, i.e. away from the operator.

8. The hypodermic needle of claim 1 or 2, wherein the blade portion has a cutting edge, and a portion of the cutting edge adjacent to the body portion forms a blunted portion.

9. The hypodermic needle of claim 8, wherein the blunted portion is formed by rounding or mechanically grinding down or applying a coating to the portion of the cutting edge.

10. The hypodermic needle of claim 2, wherein the transition section is arcuately curved.

11. The hypodermic needle of claim 10, wherein the transition section has a curvature greater than a curvature of the shank section.

12. The hypodermic needle of claim 10, wherein a line passing through the proximal end point of the shank section and the distal end point of the transition section forms an angle with a central axis of a line of the spike section of greater than 70 °.

13. The hypodermic needle of claim 3, wherein the proximal end of the proximal section is chamfered or rounded, and/or the distal right angle transition of the proximal section.

14. Subcutaneous pulling assembly, characterized in that it comprises a subcutaneous pulling needle according to any of claims 1 to 13 and a device to be pulled, to which the subcutaneous pulling needle can be connected with its connection section.

15. Subcutaneous traction assembly according to claim 14, characterized in that the device to be towed is a drainage catheter.

16. Subcutaneous distraction assembly according to claim 15, wherein the connection section of the subcutaneous distraction needle is connected with the device to be distracted in an interference fit.

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