CN216090706U - Puncture needle and cannula puncture device - Google Patents

Abstract

The application discloses pjncture needle and sleeve pipe puncture ware, wherein, the pjncture needle includes the needle bar, and the needle bar is used for the one end that the syringe needle cover put to be first end, and first end has side cavity wall and strain port, and the side cavity wall encloses along the circumferencial direction of needle bar to construct hollow structure with first end, and strain port then link up the setting of side cavity wall, strain port can make first end shrink when first end atress and warp. Firstly, when the first end part is stressed due to the influence of processing and production temperature when the needle rod is combined with the needle head structure, the existence of the strain port can provide a structural foundation for the first end part to shrink and deform, so that deformation stress is counteracted or dispersed, and the needle head is ensured to be firmly sleeved on the first end part; secondly, when the puncture needle is actually used, the needle head can be prevented from being expanded due to the contraction and deformation capacity of the first end part, so that the phenomena of cracks, cracking, even separation from the needle rod and the like of the needle head are effectively prevented.

Description

Puncture needle and cannula puncture device

Technical Field

The utility model relates to the field of medical instruments, in particular to a puncture needle and a cannula puncture outfit.

Background

The puncture outfit is used to puncture the abdominal wall and provide passage for other surgical instruments or tools to enter the body cavity. The puncture instrument generally includes a cannula portion for accessing the body cavity as another surgical instrument or tool and a puncture needle portion extending through the cannula portion; when in minimally invasive medical operation of human body, firstly, a scalpel is used for cutting the surface layer of skin, then a puncture needle penetrates the skin and enters a body cavity together with a sleeve, and finally the puncture needle is pulled out, and the sleeve can be used as a channel for introducing various surgical instruments or tools into the body cavity and providing air inflation to enable the abdominal wall to rise above organs. At present, the existing puncture needle has the problems that the components are easy to damage and even separate from each other when in actual use.

SUMMERY OF THE UTILITY MODEL

The utility model mainly solves the technical problem of providing a puncture needle and a cannula puncture outfit adopting the puncture needle, so that the structure of the puncture needle is more stable and reliable.

In one embodiment, the present application provides a puncture needle including a needle shaft, one end of the needle shaft for needle sheathing is a first end portion, and the first end portion has:

a side cavity wall that encloses along a circumferential direction of the needle shaft to configure the first end into a hollow structure; and

and the strain port is arranged by penetrating through the wall of the side cavity, and can enable the first end part to contract and deform when the first end part is stressed.

In one embodiment, the strain gage comprises:

the closed structure is arranged by penetrating through the side cavity wall;

and/or

And the notch structure is arranged by penetrating through the side cavity wall, and a notch of the notch structure is cut through to the end face of the first end part in the axial direction of the needle rod.

In one embodiment, the first end has a plurality of strain ports arranged at intervals along the circumferential direction of the needle shaft.

In one embodiment, at least one of the strain ports includes a notch structure extending along an axial direction of the needle shaft.

In one embodiment, the strain port extends in the axial direction of the needle shaft or obliquely extends in the circumferential direction of the needle shaft.

In one embodiment, the maximum width of the strain relief in the circumferential direction of the needle shaft is smaller than the difference between the diameter of the first end and the thickness of the lateral cavity wall.

In one embodiment, the maximum width of the strain port along the circumferential direction of the needle rod ranges from 0.05mm to 0.20 mm.

In one embodiment, the syringe further comprises a needle, wherein the first end is made of stainless steel materials, and the needle is made of plastic materials.

In one embodiment, the first end further has a fixing port, and the fixing port is disposed through the side cavity wall and is used for embedding a preset portion of the needle so that the needle is firmly sleeved on the first end.

In view of the above, in one embodiment, the present application provides a cannula puncture instrument comprising a puncture needle as described in any one of the above.

According to the puncture needle of the embodiment, the puncture needle comprises a needle rod, one end of the needle rod, used for sleeving the needle head, is a first end part, the first end part is provided with a side cavity wall and a strain port, the side cavity wall is enclosed along the circumferential direction of the needle rod so as to enable the first end part to be constructed into a hollow structure, the strain port is arranged through the side cavity wall, and the strain port can enable the first end part to shrink and deform when the first end part is stressed. Firstly, when the first end part is stressed due to the influence of processing and production temperature when the needle rod is combined with the needle head structure, the existence of the strain port can provide a structural foundation for the first end part to shrink and deform, so that deformation stress is counteracted or dispersed, and the needle head is ensured to be firmly sleeved on the first end part; secondly, when the puncture needle is actually used, the needle head can be prevented from being expanded due to the contraction and deformation capacity of the first end part, so that the phenomena of cracks, cracking, even separation from the needle rod and the like of the needle head are effectively prevented.

Drawings

Fig. 1 is a simplified schematic diagram of a partial structure of a conventional trocar.

Fig. 2 is a simplified schematic structural diagram of a cannula puncture device according to an embodiment of the present application.

Fig. 3 is an exploded view of a puncture needle according to an embodiment of the present invention.

Fig. 4 is an exploded view of a puncture needle according to an embodiment of the present invention (ii).

Fig. 5 is a plan view of the needle shaft of a puncture needle according to an embodiment of the present invention.

Fig. 6 is a plan view schematically showing a needle shaft of a puncture needle according to an embodiment of the present invention (ii).

Fig. 7 is a plan view schematically showing (iii) a needle shaft in a puncture needle according to an embodiment of the present application.

Fig. 8 is a plan view schematically showing a needle shaft in a puncture needle according to an embodiment of the present application (iv).

Fig. 9 is a plan view schematically showing a needle shaft in a puncture needle according to an embodiment of the present application (fig.).

Fig. 10 is a plan view schematically showing (six) the needle shaft in a puncture needle according to an embodiment of the present application.

Fig. 11 is a plan view schematically showing (seven) the needle shaft in a puncture needle according to the embodiment of the present application.

Fig. 12 is a plan view schematically showing (eight) the needle shaft in a puncture needle according to the embodiment of the present application.

FIG. 13 is a dimensional representation of a first end of a needle of the present application in accordance with an embodiment of the present application.

Figure 14 is a plan view of the needle tip of a needle of the present application in accordance with an embodiment.

Figure 15 is a plan view of the needle tip of a needle of the present application in accordance with an embodiment.

Figure 16 is a plan view of the needle tip of a needle of the present application in accordance with an embodiment.

Fig. 17 is a plan view of the needle tip of a lancet according to an embodiment of the present application.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

Referring to fig. 1, a cannula portion of a conventional cannula puncture device generally includes a cannula portion a and a sealing ring portion b disposed inside the cannula portion a, and a puncture needle portion generally includes a needle shaft portion c and a blade portion d disposed at an end side of the needle shaft portion c; when the puncture needle part is actually used, the problems that the knife head part d cracks, cracks and is damaged, even the knife head part d is separated from the needle rod part c and the like often occur; the applicant has found that the reason for the above problems is:

the cutter head part d and the needle rod part c are usually made of different materials and sleeved into a whole, the thermal shrinkage proportion of the cutter head part d and the needle rod part c is different due to the difference of the materials, the cutter head part d and the needle rod part c are affected by factors such as processing production temperature, application environment temperature and the like in the process of combining the cutter head part d and the needle rod part c or in the process of later use of the puncture needle part, unequal deformation quantities are often generated between the cutter head part d and the needle rod part c, and the phenomena of cracking, separation from the needle rod part c and the like are easily caused by deformation stress.

In addition, the applicant researches and discovers that due to the size difference between the needle rod part c and the cutter head part d, the cutter head part d can form a step structure e in a combination area of the needle rod part c and the cutter head part d after being sleeved on the needle rod part c, and because the table top of the step structure e is a plane structure distributed in parallel to the radial direction of the needle rod part c, when the puncture needle part is pulled out from the sleeve part, when the step structure e is contacted and met with the sealing ring part b, the table top of the step structure e can be contacted with the sealing ring part b comprehensively or in the whole area, and the resistance for pulling out the puncture needle part is overlarge due to the fact that the step structure e is hung on the sealing ring part b or is hindered by the sealing ring part b, so that the difficulty for pulling out the puncture needle is increased, and the smoothness for pulling out the puncture needle is seriously influenced. Meanwhile, if the resistance of the puncture needle part in the drawing process is too large, when the puncture needle part is forcibly drawn, the sealing ring part b is easily damaged or the cutter head part d is separated from the needle rod part c, and finally, the whole puncture device or the puncture needle part has a series of problems of structural damage, functional failure and the like.

The embodiment provides a cannula puncture outfit, for example, a cannula puncture outfit with the specification of 5mm or 10 mm; referring to fig. 2-4, the trocar includes an trocar assembly and a cannula assembly; the sleeve assembly comprises a sleeve assembly, a sealing member A and other components, wherein the sealing member A is arranged in the sleeve assembly, and the other components exist according to needs; the puncture needle assembly comprises a puncture needle B and other components which are present according to the needs; puncture needles B are inserted into the cannula member in a detachable manner and are distributed through the sealing opening of the sealing member a.

During operation, firstly, a scalpel is used for cutting the skin epidermis, then the puncture needle B is used for penetrating the skin and entering a body cavity together with the cannula assembly, and finally the puncture needle B is pulled out of the cannula assembly through the sealing port of the sealing element A; the cannula assembly can be used as a passage for introducing various instruments or aids into the abdominal cavity and for providing insufflation to elevate the abdominal wall above the organ.

In one embodiment, referring to fig. 3-13, a needle B includes a shaft 10 and a needle tip 20; wherein, the needle bar 10 has two opposite ends along the axial direction, one end for the needle 20 to be sleeved can be defined as a first end 10a, one end opposite to the first end 10a is defined as a second end 10b, the first end 10a has a side cavity wall and a strain port 11, the side cavity wall is enclosed along the circumferential direction of the needle bar 10, thereby the first end 10a is constructed into a hollow structure, and the strain port 11 is arranged through the side cavity wall (namely, the strain port penetrates from the periphery of the first end 10a to the space enclosed by the side cavity wall), and the strain port 11 is arranged in the sleeved range of the needle 20, which can also be understood as follows: after needle 20 is sleeved on first end 10a, strain relief 11 is located within the coverage of needle 20.

On one hand, when the first end 10a is stressed due to the influence of the processing and production temperature when the needle rod 10 is structurally combined with the needle 20, the existence of the strain port 11 can provide a structural basis for the shrinkage deformation of the first end 10a, so as to counteract or disperse the deformation stress and ensure that the needle 20 is firmly sleeved on the end of the needle rod 10; on the other hand, even in the later use of the puncture needle B, the needle head 20 can be prevented from being expanded due to the contractive deformation ability of the first end portion 10a, and the needle head 20 can be effectively prevented from cracking, splitting, or even being separated from the needle shaft 10.

Referring to fig. 3 to 12, the strain relief 11 may be formed by one or both of a closed structure and a cut structure according to actual conditions; the closed structure is provided to penetrate through the side wall, and is generally understood to mean a closed-loop hole-like or mouth-like structure penetrating from the outer peripheral surface of the first end portion 10a (i.e., the outer surface of the side wall) to the inner space of the first end portion 10 a; the notch structure is provided through the side cavity wall, and the notch of the notch structure is cut through to the end face of the first end portion 10a in the axial direction of the needle bar 10, and in general, the notch structure may be understood as an open-loop type notch structure that is cut from the axial end face of the first end portion 10a and extends toward the second end portion 10b side.

In one embodiment, referring to fig. 8 to 10, the strain relief 11 is a cut structure extending along the axial direction of the needle shaft 10, and the caliber of the cut structure may be a constant caliber structure (as shown in fig. 8), so that the overall contour of the cut structure is approximately a rectangular strip-shaped structure; the notch structure may also be of a variable diameter configuration, for example, referring to fig. 10, the overall profile of the notch structure presents a strip-like configuration that is approximately triangular with the outlet diameter gradually narrowing from the notch end toward the closed end; for another example, referring to fig. 9, the aperture of the notch structure is enlarged or reduced in different regions in the extending direction. In summary, the strain relief 11 itself having the slit structure can provide the first end portion 10a with the ability to contract and deform in the circumferential direction when the first end portion 10a is subjected to a force. In specific implementation, the number of the strain ports 11 can be selected according to actual requirements, for example, only one strain port 11 can be provided at the first end portion 10a, so that the first end portion 10a has the capability of contracting and deforming along the circumferential direction; for another example, referring to fig. 8 and 10, the first end portion 11a has two, three or more strain ports 11, and the strain ports 11 are symmetrically arranged at intervals or uniformly arranged at intervals along the circumferential direction of the needle shaft 10, so that the first end portion 10a can have radial shrinkage deformation capability under the combined action of the strain ports 11.

In one embodiment, referring to fig. 4, 5 and 7, the strain relief 11 is mainly a closed structure extending linearly along the axial direction of the needle shaft 10; referring to fig. 4 and 7, the closed structure may be a strip; referring to fig. 5, the plurality of closed structures are arranged at intervals along the axial direction of the needle bar 10 or along the extending direction of the strain port 11; the strain relief 11 itself can provide the first end portion 10a with the ability to contract and deform in the circumferential direction when the first end portion 10a is subjected to a force. In specific implementation, the number of the strain ports 11 is selected according to actual requirements, for example, the first end portion 10a may have only one strain port 11, so that the first end portion 10a has the capability of contracting and deforming in the circumferential direction; for another example, referring to fig. 4, the first end portion 10a has two strain ports 11, and the two strain ports 11 are symmetrically arranged; for another example, referring to fig. 7, the first end portion 10a has a plurality of strain notches 11 (e.g., three, four or more strain notches 11), and the plurality of strain notches 11 are uniformly and alternately arranged along the circumferential direction; therefore, under the combined action of the uniformly or symmetrically arranged strain ports 11, the first end portion 11a can have the radial contraction deformation capability.

In one embodiment, referring to fig. 3 and 6, the strain relief 11 is formed by combining a notch structure and one or more closed structures, and the notch structure and the closed structure (and between two adjacent closed structures) are arranged at intervals along the axial direction of the needle rod 10; in this case, the first end portion 10a may have only one strain relief 11, or may have a plurality of strain relief 11 (the plurality of strain relief 11 are arranged at intervals along the circumferential direction), so that the first end portion a has good contractive deformability under the combined action of the notch structure and the closed structure.

In one embodiment, referring to fig. 11 and 12, the strain relief 11 extends obliquely along the circumferential direction of the needle shaft 10 (e.g. the inclination may be set at 45 °, 60 °, etc.), and in this case, the strain relief 11 may adopt a closed structure (e.g. one or more spaced closed structures), a notched structure or a combination of a notched structure and a closed structure.

In other embodiments, the incision structure and the closed-end structure may not be limited to a regular linear extension along the circumferential direction or the axial direction, but may also be extended in a spline curve or a broken line (as shown in fig. 12); in the embodiment in which the first end portion 10a has a plurality of strain ports 11, the specific composition, extension form, and the like of each strain port 11 may be the same or different, so as to meet actual manufacturing and use requirements.

In one embodiment, referring to fig. 13, the maximum width L (or the maximum diameter) of the strain port 11 along the circumferential direction of the needle shaft 10 can be flexibly set according to actual requirements, in a preferred embodiment, the maximum width L of the strain port 11 should be smaller than the difference between the diameter D of the first end portion 10a and the thickness H of the side cavity wall, and this limitation on the maximum width L of the strain port 11 can create conditions for the stable combination of the needle shaft 10 and the needle 20 while ensuring the first end portion 10a has the capability of shrinkage and deformation, and avoid the influence on the combination effect of the needle shaft 10 and the needle 20 due to the excessively large diameter of the strain port 11; in specific implementation, based on consideration of manufacturing materials, process flows and other factors of the needle rod 10 and the needle 20, a maximum width of the strain port 11 can be controlled within a range of 0.05mm to 0.20mm, and the value not only can control the size of the needle rod 10 or the second end portion 10a and the like within a reasonable range, but also can ensure the structural property of the first end portion 10a, so that the first end portion can be firmly combined with the needle 20.

In one embodiment, the needle shaft 10 (especially the first end portion 10 a) is made of metal material such as stainless steel, and the needle 20 is made of plastic or resin material such as PC material (i.e. polycarbonate); at this time, the maximum width L of the variable orifice 11 is controlled to be about 0.15mm (e.g., 0.15mm or less); thus, in the production of the needle bar 10 by heating, the strain port 11 can be shrunk and narrowed by about 0.05mm under the action of thermal stress in a normal condition; when the needle head 20 is combined with the needle rod 10 by injection molding, PC material and the like can be prevented from flowing into the strain port 11 due to self fluidity by limiting the width dimension of the strain port 11; after the combination is completed, the existence of the strain port 11 can counteract unequal shrinkage deformation amounts generated by different materials of the needle rod 10 and the needle head 20, so that the problems of cracking, splitting or falling off of the needle head 20 and the like are avoided.

In one embodiment, referring to fig. 8 to 12, the first end portion 10a further has a fixing opening 12, and the size and shape of the fixing opening 12 can be flexibly set according to the requirement, and the fixing opening 12 is mainly used for embedding a preset portion of the needle 20, so as to ensure that the needle 20 can be more firmly sleeved on the first end portion 10a, and further prevent the two from being separated; specifically, when needle 20 is injection molded with plastic material to structurally engage with shaft 10, the partially melted plastic may flow into holding port 12, thereby allowing needle 20 to be securely disposed at first end 10a after solidification.

In one embodiment, referring to fig. 2 to 13, the needle shaft 10 is made of a hollow tube structure, on one hand, the first end 10a can be made of a hollow structure to provide for the arrangement of the strain relief 11 and the nesting combination of the first end 10a and the needle 20; on the other hand, the inner space of the needle shaft 10 can be used as a shaft cavity, so that an auxiliary tool (such as an endoscope) can be inserted into the needle 10 through the shaft cavity to assist an operator in performing a puncturing operation.

In other embodiments, the needle shaft 10 may have a solid cylindrical structure, and the strain port 11 may be formed by providing a through-hole structure or a slit structure in the end portion (corresponding to the first end portion 10 a) in the radial direction, so that the first end portion 10a has a certain ability to contract and deform.

In one embodiment, referring to fig. 2 to 4 and 14 to 17, the needle 20 has a trepan portion 20a for inserting the first end portion 10a into the needle 20, and the trepan portion 20a can be used to enable the needle 20 to be sleeved on the first end portion 10a along the axial direction of the needle shaft 10, so that a combination end surface 21 distributed around the needle shaft 10 can be formed on the periphery of the needle shaft 10, and the combination end surface 21 can also be understood as a port end surface of the trepan portion 20 a; the combination end surface 21 is provided with ridge parts 22 extending along the axial direction of the needle rod 10, and the appearance configuration of the combination end surface 21 can be changed by the ridge parts 22, so that the combination end surface 21 presents a plane configuration with non-radial vertical distribution. When the puncture needle B is matched with the seal a (for example, during the process of pulling the puncture needle B out of the cannula assembly), the ridge portion 22 can be used for guiding, so that the ridge portion 22 is in contact with the seal a in advance and passes through the sealing port of the seal a, namely, the ridge portion 22 can be used for gradually (or partially to completely) contacting and passing through the sealing port of the seal a, so that the resistance encountered when the combination end face 21 is in contact with the seal a can be reduced, and the puncture needle B (particularly, the needle rod 10) can be pulled out smoothly by applying a small pulling action force to the puncture needle B; moreover, under the action of the ridge part 22, the whole combination end surface 21 is in progressive contact with and passes through the sealing member A, so that the sealing member A is not easy to damage (such as the breakage of a sealing port) or the needle 20 is not easy to be separated from the needle rod 10 due to the catching of the sealing member A.

In one embodiment, the combination end surface 21 adopts a structure similar to a sawtooth shape, and a plane in which the radial direction of the needle rod 10 is located is taken as a reference, and the combination end surface 21 is formed by combining at least one concave surface area and one convex surface area; wherein, the convex surface area is equivalent to the ridge part 22 of the present embodiment; specifically, referring to fig. 15 to 17, the ridge 22 includes a first inclined surface and a second inclined surface, the first inclined surface and the second inclined surface are disposed in a separated state at an end facing the first end portion 10a, and the first inclined surface and the second inclined surface are disposed in a crossed state at an end facing the second end portion 10 b; the "crossing state" may be a crossing state in the form of an angular corner (or a sharp corner) along the circumferential direction of the needle shaft 10 so that the tip of the ridge 22 is sharp, or a crossing state in the form of a rounded corner along the circumferential direction of the needle shaft 10 so that one end of the first inclined surface facing the second end 10b is smoothly transitionally connected with one end of the second end facing the second end 10b so as to form the tip of the ridge 22. In specific implementation, as for the first inclined plane and the second inclined plane, the first inclined plane and the second inclined plane can adopt any one of a plane structure, a folded surface structure or an arc surface structure according to actual conditions; referring to fig. 15, the first inclined plane and the second inclined plane are both planar structures; referring to fig. 17, the first inclined surface and the second inclined surface are both arc-shaped structures; referring to fig. 16, the first inclined plane and the second inclined plane are both folded structures; so that the first and second bevels can be used to form a ridge 22 on the coupling end face 21, which ridge extends in the axial direction of the shank 10.

In one embodiment, referring to fig. 15 to 17, the combining end face 21 has a plurality of ridges 22, and the plurality of ridges 22 are uniformly arranged along the circumferential direction of the needle bar 10; depending on the configuration of the first and second slopes of the ridge 22, the extension length of each ridge 22 in the axial direction of the needle shaft 10 may be the same (as shown in fig. 15) or may be different (as shown in fig. 17); meanwhile, in two adjacent ridges 22, the end of the first inclined surface of one ridge 22 facing the first end portion 10a and the end of the first inclined surface (or the second inclined surface) of the other ridge 22 facing the first end portion 10a may be arranged in an intersecting state, so that the entire joint end surface 21 may be constructed using a plurality of ridges 22.

In one embodiment, referring to fig. 3, 4 and 14, the coupling end surface 21 may also be disposed in an inclined distribution around the shank 10, so that it is equivalent to the coupling end surface 21 existing in the form of an inclined cone structure at the periphery of the shank 10; at this time, since the coupling end face 21 has two end points in the axial direction of the shank 10, if there is a difference in height between the two end points with reference to a horizontal plane or a radial plane of the shank 10, one end point is located toward or adjacent to the second end 10b, and the other end point is located toward or adjacent to the first end 10 a; thus, one end toward or adjacent to the second end 10b may be utilized as the ridge 22; the puncture needle B can be gradually brought into contact with the coupling end surface 21 and passed through the seal a when being drawn outward through the seal opening of the seal a.

The present invention has been described in terms of specific examples, which are provided to aid understanding of the utility model and are not intended to be limiting. For a person skilled in the art to which the utility model pertains, several simple deductions, modifications or substitutions may be made according to the idea of the utility model.

Claims (10)

1. A puncture needle comprising a needle shaft, one end of the needle shaft for sheathing a needle is a first end portion, and the first end portion has:

a side cavity wall that encloses along a circumferential direction of the needle shaft to configure the first end into a hollow structure; and

and the strain port is arranged by penetrating through the wall of the side cavity, and can enable the first end part to contract and deform when the first end part is stressed.

2. The needle of claim 1 wherein said strain relief comprises:

the closed structure is arranged by penetrating through the side cavity wall;

and/or

And the notch structure is arranged by penetrating through the side cavity wall, and a notch of the notch structure is cut through to the end face of the first end part in the axial direction of the needle rod.

3. The needle of claim 2 wherein the first end portion has a plurality of strain ports spaced circumferentially about the shaft.

4. A puncture needle according to claim 3, wherein at least one strain relief of the plurality of strain reliefs comprises a notch structure extending in the axial direction of the needle shaft.

5. A puncture needle according to claim 2, wherein the strain relief extends in the axial direction of the needle shaft or obliquely in the circumferential direction of the needle shaft.

6. A puncture needle according to claim 1, wherein the maximum width of the strain relief in the circumferential direction of the needle shaft is smaller than the difference between the diameter of the first end and the thickness of the side chamber wall.

7. A puncture needle according to claim 6, wherein the maximum width of the strain relief in the circumferential direction of the needle shaft ranges from 0.05mm to 0.20 mm.

8. The needle of claim 7 further comprising a tip, said first end portion being formed of a stainless steel material and said tip being formed of a plastic material.

9. A needle in accordance with claim 1, wherein said first end further includes a securement port disposed through said side chamber wall for insertion of a predetermined portion of said needle to securely nest said needle within said first end.

10. A cannula puncture device comprising a puncture needle according to any one of claims 1 to 9.

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