CN211484736U - Door type nail - Google Patents

Abstract

The utility model belongs to the field of medical equipment, a door type nail is disclosed, including the crimping arm that is used for to pressing fixed human soft tissue, and connect in two fixed arms that are arranged in inserting human bone at the both ends of crimping arm, two fixed arms are located the homonymy and the non-intersect of crimping arm, and the contained angle of two fixed arms on length direction is the acute angle, and wherein, the length of two fixed arms is inequality. The door-shaped nail of the utility model has better fixing effect with human bones and is easier to fuse with human bones.

Description

a door nail

technical field

The utility model belongs to the field of medical instruments, in particular to a door type nail.

Background technique

Portal nails are instruments used to fix human bones with cracks and surrounding soft tissues (such as ligaments, etc.) when there are cracks in human bones. Existing portal nails usually include two fixation arms for inserting into human bones. and a crimping arm connecting the two fixing arms for pressing and fixing human soft tissue. However, the existing portal nails usually have problems such as easy prolapse of the fixation arm and unsatisfactory fixation effect; in addition, the existing portal nails are usually made of metal materials, and their elastic modulus is much higher than that of bone tissue, which makes the joints After being subjected to a special external force, the surrounding normal organs will be damaged due to the stress shielding effect. In addition, the metal portal nails are prone to release harmful metal ions, causing osteolysis or the formation of allergens and damage to human health. Portal nails are incompatible with commonly used MRI and computed tomography techniques, and are not conducive to monitoring bone growth and medical personnel's monitoring of human bone healing.

Aiming at the defects of the existing portal nails, those skilled in the art hope to propose a portal nail with better fixation effect and easier fusion with human bone.

Utility model content

In order to solve all or part of the above problems, the purpose of the present invention is to provide a portal nail, which includes a crimping arm for pressing and fixing human soft tissue, and two ends connected to the crimping arm for inserting into human bone. There are two fixed arms, the two fixed arms are located on the same side of the crimping arm and do not intersect, and the included angle between the two fixed arms in the length direction is an acute angle, wherein the lengths of the two fixed arms are different.

Further, the two fixing arms extend toward each other; or one of the two fixing arms is vertically connected with the crimping arm, and the other fixing arm extends toward the fixing arm.

Further, barb teeth are formed on the outer side surface and/or the inner side surface of the fixing arm for preventing the fixing arm from coming out.

Preferably, the included angle formed by the transverse edge of the barb tooth and the vertical edge of the barb tooth is an acute angle;

Further preferably, the included angle between the transverse side of the barb tooth and the horizontal line in the horizontal direction, and the included angle between the vertical side of the barb tooth and the vertical line in the vertical direction are all less than 15°.

Further, the outer side surface of the fixing arm is formed as an arc surface, and the inner side surface of the fixing arm is formed with barb teeth.

Further, the end surface of the free end of the fixed arm is formed as a flat surface or a tapered surface.

Further, the cross-sectional shape of the fixing arm in the horizontal direction is a polygon.

Further, the crimping arm has a longitudinal cross-sectional dimension that gradually increases from the middle region of the crimping arm to both ends of the crimping arm.

Further, a pressing convex portion for pressing and fixing the soft tissue of the human body is formed on the side of the pressing arm which is connected to the fixing arm.

Preferably, the pressing protrusion includes a plurality of protrusions.

Further preferably, the plurality of protrusions are evenly distributed.

Also preferably, the pressing convex portion is tapered or arcuate.

Further, the outer surface of the crimping arm is configured as a rough surface.

Further, the gate nail is made of polyether ether ketone material.

Compared with the prior art, the portal nail of the present invention has a simple structure, and the fixed arm is inserted and fixed in the human bone to form a certain clamping effect on the bone, which can effectively prevent the portal nail from coming out; The lengths of the arms are not equal, so that when the fixation arm is pressed into the human bone for fixation, the clamping points of the two fixation arms to the bone are located in different sections of the bone, that is, the clamping points of the two fixation arms to the bone are not exactly aligned, scattered. The clamping force of the two fixation arms on the bone on the same section can effectively avoid the large force or excessive clamping of the bone by the portal nail, so as to ensure the clamping effect of the portal nail and effectively protect the bone of the human body. quality from damage.

Description of drawings

1 is a perspective view of the structure of a gate nail according to an embodiment of the present invention;

2 is a front view of the structure of the gate nail according to the embodiment of the present invention;

3 is a top view of the structure of the gate nail according to the embodiment of the present invention;

4 is a side view of the structure of the gate nail according to the embodiment of the present invention.

Detailed ways

In order to better understand the purpose, structure and function of the present utility model, the door type nail of the present utility model will be described in further detail below with reference to the accompanying drawings.

1-4 show the structure of the gate nail 100 according to the embodiment of the present invention. As shown in FIG. 1 , the portal nail 100 includes a crimping arm 1 for pressing and fixing human soft tissues (such as ligaments), and two fixing arms connected to both ends of the crimping arm 1 for inserting into human bones 2. The two fixing arms 2 are located on the same side of the crimping arm 1 and do not intersect, and the included angle between the two fixing arms 2 in the length direction is an acute angle, wherein the lengths of the two fixing arms 2 are different.

The portal nail 100 of the present invention can be applied to fixation of the bone and its surrounding ligaments when bone fractures occur in the human body. According to the bone fractures in different parts, the portal nail 100 of corresponding size can be selected according to specific conditions.

When the portal nail 100 of the embodiment of the present invention is in use, the two fixation arms 2 are located on both sides of the bone fissure respectively, and the two fixation arms 2 are inserted into the bone. At this time, the crimping arm 1 can simultaneously connect the ligament The pressure is fixed between itself and the bone, or the ligament can be wrapped around the crimp arm 1 for fixation. Since the two fixation arms 2 are located on the same side of the crimping arm 1 and do not intersect, and the included angle between the two fixation arms 2 in the length direction is an acute angle, the fixation arms 2 form an acute formation on the bone after being inserted and fixed in the human bone. Therefore, the gate nail 100 can be effectively prevented from coming out; at the same time, due to the unequal lengths of the two fixing arms 2, when the fixing arms 2 are pressed into the human bone for fixation, the two fixing arms 2. The clamping points of the two pairs of bones are located in different sections of the bone, that is, the clamping points of the two fixation arms 2 to the bones are not aligned. Compared with the two fixed arms 2, the clamping points of the bones are located in the same section of the bone. This arrangement of the present invention can disperse the clamping force of the two fixation arms 2 on the bone on the same section, so it can effectively avoid the large force or excessive clamping of the bone by the portal nail 100, so as to ensure the safety of the portal nail 100. On the basis of the clamping effect of 100, it can effectively protect the bone of the human body from damage.

According to the portal nail 100 of the embodiment of the present invention, the two fixing arms 2 can be arranged in various forms, as long as it is ensured that the two can achieve a good clamping effect.

In a preferred embodiment, as shown in FIG. 1 , the two fixing arms 2 may extend towards each other. In another preferred embodiment, one of the two fixing arms 2 may be vertically connected to the crimping arm 1 , and the other fixing arm 2 may extend toward the fixing arm 2 . In this embodiment, the fixation arm 2 vertically connected to the crimping arm 1 can be inserted into the bone of the human body more easily, thus facilitating the operation of the operator.

According to the portal nail 100 of the embodiment of the present invention, the outer and/or inner surfaces of the fixing arm 2 may be formed with barb teeth 21 for preventing the fixing arm 2 from coming out. This arrangement enables the tooth surface of the barb teeth 21 to be in contact with the bone and tightly hook the bone after the fixation arm 2 enters the human bone under external force. The arrangement of the barb teeth 21 not only makes the fixation arm 2 easy to insert into the bone in the substance and more difficult to dislodge from the bone after insertion.

In the preferred embodiment shown in FIG. 2 , in order to improve the hooking force of the barb teeth, the angle formed by the horizontal side of the barb teeth 21 and the vertical side of the barb teeth 21 can be an acute angle, and further , the angle β between the horizontal side of the barb tooth 21 and the horizontal plane, and the angle α between the vertical side of the barb tooth 21 and the vertical plane are all less than 15°.

In a preferred embodiment, as shown in FIG. 1 or 2 , the outer surface of the fixing arm 2 may be formed as an arc surface, and the inner surface of the fixing arm 2 may be formed with barb teeth 21 . The outer side surface is formed as an arc surface to facilitate the insertion of the fixation arm 2 into the bone.

According to the portal nail 100 according to the embodiment of the present invention, as shown in FIG. 1 , the end surface of the free end of the fixing arm 2 can be formed as a flat surface or a tapered surface. When the end face of the free end of the fixation arm 2 is set as a tapered surface, it is helpful to insert the fixation arm 2 into the human bone quickly and effortlessly; The operator can select fixation arms 2 with different end face shapes according to different bone types to meet different surgical requirements.

Further, the cross-sectional shape of the fixing arm 2 in the horizontal direction may be a polygon. It is preferably a quadrangle, for example, a square, a rectangle, a trapezoid, or the like may be used. The fixation arm 2 with a polygonal cross-sectional shape can avoid the rotation of the fixation arm 2 after the fixation arm 2 is inserted into the bone, thereby playing a good auxiliary role in maintaining the fixation stability of the portal nail 100 . In addition, in the embodiment shown in FIG. 3 , the crimping arm 1 may have a longitudinal cross-sectional dimension that gradually increases from the middle region of the crimping arm 1 to both ends of the crimping arm 1 . Through this setting, the size of the two ends of the crimping arm 1 connected to the two fixing arms 2 is larger, and the two ends with the larger size can provide more stable support for the fixing arms 2, and at the same time when the fixing arm 2 needs to be applied When an external force is used to press the fixation arm 2 into the human bone, a more stable force application platform can also be provided for the operator.

According to the portal nail 100 of the embodiment of the present invention, a pressing protrusion 11 for pressing and fixing human soft tissue may be formed on the side A of the pressing arm 1 connected to the fixing arm 2 . Since the outer side of human bones is generally protected by soft tissues such as ligaments, when a bone fracture occurs in the human body, it is necessary to fix the fractured part, and at the same time, fix or limit the soft tissues such as ligaments. Such soft tissue provides better pressing and fixing, or the pressing protrusions 11 directly abut on the human bone, and soft tissues such as ligaments may be wrapped between adjacent pressing protrusions 11 .

Preferably, the pressing protrusion 11 may include a plurality of protrusions. Further preferably, the plurality of protrusions are evenly distributed. Also preferably, the pressing protrusion 11 may be tapered or arcuate. Furthermore, the outer surface of the crimping arm 1 may be configured as a rough surface. With this arrangement, when the medical staff needs to use the operating tool to fix the portal nail 100 of the embodiment of the present invention to the human bone, the operating tool and the portal nail 100 are not easily slipped.

The door nail 100 according to the embodiment of the present invention can be made of polyether ether ketone material. The polyetheretherketone material has good biocompatibility, wear resistance, rigidity and flexibility, especially the fatigue resistance under alternating stress is very outstanding, so that the door nail 100 made of the polyetheretherketone material has It has a long service life and will not be rejected by human bone, and can be fused with human bone. Compared with the existing portal nails supported by metal materials, especially when used in children's surgery, the existence of metal nails will have a negative impact on bone development. Influence, after the metal portal nail is implanted, the human tissue is more prone to rejection or infection, and a second operation is required to remove the portal nail. On the other hand, the portal nail 100 of the embodiment of the present invention does not require a second operation to be taken out, and the impact on the soft tissue of the human body is also small. In addition, the elastic modulus of polyetheretherketone material is close to that of human bone, especially the elastic modulus of carbon fiber reinforced polyetheretherketone material is more matched with the elastic modulus of human bone. This close or matching elastic modulus weakens or eliminates the stress shielding effect to a certain extent (that is, when two materials with different elastic moduli are stressed together, the one with the larger elastic modulus will bear more stress). It is beneficial to the fusion between the portal nail 100 and the human bone, and ensures the long-term stability of the polyetheretherketone material implant. In addition, the portal nail 100 made of polyetheretherketone material can transmit X-ray, CT (Computed Tomography) or MRI (magnetic resonance imaging, also known as Magnetic Resonance Imaging) scan without generating artifacts, so it can Allows healthcare workers to monitor bone growth and healing processes.

Compared with the prior art, the gate nail 100 of the embodiment of the present invention has the following advantages:

1) By setting the two fixing arms 2 on the same side of the crimping arm 1 and not intersecting, and the included angle between the two fixing arms 2 in the length direction is an acute angle, the fixing arms 2 will face each other after being inserted and fixed in the human bone. The bone forms a certain clamping effect, thereby effectively preventing the portal nail 100 from coming out.

2) By setting the fixing arms 2 of different lengths, when the fixing arms 2 are pressed into the human bone for fixation, the clamping points of the two fixing arms 2 to the bone are located at different sections of the bone, that is, the two fixing arms 2 to the bone. The clamping points are not aligned. Compared with the fact that the clamping points of the two fixation arms 2 to the bone are located on the same section of the bone, this arrangement of the present invention can disperse the clamping of the bone by the two fixation arms 2 on the same section. Therefore, the large force or excessive clamping of the bone by the portal nail 100 can be effectively avoided, thereby effectively protecting the bone of the human body from damage on the basis of ensuring the clamping effect of the portal nail 100 .

3) The portal nail 100 is made of polyether ether ketone material, so that the portal nail 100 is not repelled from human bone, can achieve good fusion with human bone, and does not require secondary surgery to take it out; using polyether ether ketone material The elastic modulus of the fabricated portal nail 100 is similar to or matched with the elastic modulus of human bone, so that the portal nail 100 of the embodiment of the present invention can weaken or eliminate the stress shielding effect to a certain extent, which is beneficial to the human body after surgery. Bone recovery; portal nail 100 made of polyetheretherketone material can pass X-ray, CT (computer tomography) or MRI (magnetic resonance imaging, also known as magnetic resonance imaging) scan without producing artifacts, It is thus convenient for medical staff to monitor the bone growth and healing process.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that : it can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the various embodiments of the present utility model The scope of the technical solution should be covered by the scope of the claims and description of the present invention. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (10)

1. The utility model provides a door type nail, its characterized in that, including the crimping arm that is used for to press fixed human soft tissue, with connect in two fixed arms that are arranged in inserting human bone at the both ends of crimping arm, two the fixed arm is located the homonymy and the non-intersect of crimping arm, and two the contained angle of fixed arm on length direction is the acute angle, wherein, two the length of fixed arm is inequality.

2. A gate nail according to claim 1, wherein two of said fixing arms extend towards each other; or one of the two fixing arms is vertically connected with the crimping arm, and the other fixing arm extends towards the fixing arm.

3. The gate nail according to claim 2, wherein said fixing arm is formed with barb teeth on the outer side and/or inner side for preventing said fixing arm from coming out.

4. A door pin according to claim 3, wherein an outer side surface of said fixing arm is formed as an arc-shaped surface, and said barbed teeth are formed on an inner side surface of said fixing arm.

5. A gate nail according to any one of claims 1 to 3, characterized in that the end face of the free end of the securing arm is formed as a plane or conical surface.

6. A gate nail according to any one of claims 1 to 3, wherein the fixing arm has a polygonal cross-sectional shape in the horizontal direction.

7. A gate nail according to any one of claims 1 to 3, wherein the crimp arm has a longitudinal cross-sectional dimension which increases progressively from a middle region of the crimp arm to both ends of the crimp arm.

8. The gate nail according to any one of claims 1 to 3, wherein a pressing protrusion for pressing and fixing human soft tissue is formed on one surface of the pressing arm connected with the fixing arm.

9. A gate nail according to any one of claims 1 to 3, wherein the outer surface of the crimp arm is configured as a roughened surface.

10. A gate spike according to any one of claims 1 to 3, wherein the gate spike is made of a polyetheretherketone material.

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