Absorbable metacarpal bone intramedullary needle

Abstract

The utility model relates to the technical field of metacarpal bone medical treatment, and discloses a metacarpal bone absorbable intramedullary needle which comprises a main nail and a matching nail, the interior of the main nail is designed to be of a hollow threaded structure, the main nail and the matching nail are used in a paired and matched mode, and the main nail and the matching nail are both made of PLGA materials. The matching nails comprise the first matching nail, the second matching nail and the third matching nail, and the first matching nail, the second matching nail and the third matching nail can be sequentially and rotationally placed into the main nail. According to the utility model, the main nail and the matching nail are both made of the PLGA material, and the PLGA material has good biocompatibility, no toxicity and good capsulation and film forming performance, so that good stability can be provided, marrow fluid in metacarpal bone can be absorbed, a secondary extraction operation is avoided, the previous two operations are changed into one operation, and the operation efficiency is improved. And meanwhile, the treatment cost can be reduced, and the defects that the metal intramedullary needle needs to be taken out for the second time and the treatment cost is increased in the current domestic and international treatment schemes are overcome.

Description

TECHNICAL FIELD

[0001] The utility model relates to metacarpal medical technology field especially, and it is a kind of metacarpal absorbable intramedullary pin. BACKGROUND

[0002] Metacarpal and metatarsal fracture lifetime incidence rate is 2.5%, after fracture, function and appearance are influenced, which requires treatment, function is considered, and appearance is also considered. Locking plate is commonly used method for treating unstable metacarpal fracture, but there is obvious scar, surrounding soft tissue is greatly stripped, periosteum and tendon are disturbed, and bone nonunion and tendon adhesion are easily caused, and obvious scar in surgical site is one of disadvantages. Metacarpal and metatarsal intramedullary pin technology is developed in recent twenty years, due to minimally invasive, simple operation, periosteum and tendon are hardly disturbed, and scar is small, and it is more and more widely applied.

[0003] And the current domestic and international treatment multiple schemes, for example, kirschner wire operation and micro-steel plate operation all exist the situation of secondary removal of metal intramedullary pin, need to carry out secondary operation, greatly improve treatment cost.

[0004] Therefore, the person skilled in the art provides a metacarpal absorbable intramedullary pin to solve the problems in the background art. UTILITY MODEL CONTENT

[0005] The utility model discloses a metacarpal absorbable intramedullary pin, which is provided to solve the problems in the prior art. The main nail and the cooperating nail are made of PLGA material, which has good biocompatibility, non-toxicity, good capsule-forming and film-forming properties, thereby providing good stability and absorbing bone marrow fluid in the metacarpal bone. This avoids secondary removal surgery, changes the previous two surgeries into one surgery, reduces the pain of secondary invasive treatment, reduces treatment costs, and solves the problem of metal intramedullary needle requiring secondary removal surgery in current domestic and international treatment schemes, and the defect of increased treatment costs.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A metacarpal absorbable intramedullary pin includes a main nail and a cooperating nail. The inside of the main nail is designed as a hollow threaded structure. The main nail and the cooperating nail are used in pairs. Both the main nail and the cooperating nail are made of PLGA material. The cooperating nail includes a first cooperating nail, a second cooperating nail and a third cooperating nail. The first cooperating nail, the second cooperating nail and the third cooperating nail can be sequentially rotated and placed in the inside of the main nail, and can be embedded with the main nail.

[0008] By the above technical scheme, after each matching nail is rotated and installed into the nail body, the position corresponding to the part of the nail body where the matching nail is installed is expanded, so that fixation is achieved. However, the depth of the first matching nail, the second matching nail and the third matching nail in the main nail can be adjusted to adjust the fixation length of the nail body. Since the main nail and the matching nail are both made of PLGA material, the PLGA material has good biocompatibility, non-toxicity, good capsule and film forming performance, so as to provide good stability and absorb the bone marrow liquid in the metacarpal bone, avoiding secondary removal surgery, changing the previous two surgeries into one surgery, thereby reducing the pain of secondary invasive treatment of diseases, and also reducing the treatment cost, solving the defects of the current domestic and international treatment scheme that the metal intramedullary needle needs secondary removal surgery and the treatment cost is increased.

[0009] Further, the main nail comprises a nail body, a large-diameter end and a small-diameter end, the large-diameter end and the small-diameter end are designed at both ends of the nail body, the nail body is designed in a conical shape, and the diameter of the large-diameter end of the nail body is 3mm and the diameter of the small-diameter end is 0.5mm.

[0010] By the above technical scheme, the main nail comprises a nail body, a large-diameter end and a small-diameter end, the large-diameter end and the small-diameter end are designed at both ends of the nail body, and the diameter of the large-diameter end is larger than that of the small-diameter end. By designing the nail body in a conical shape, the insertion of the main nail is facilitated.

[0011] Further, a plurality of mesh holes are formed in the outer end of the nail body to form a mesh structure.

[0012] By the above technical scheme, a plurality of mesh holes are formed in the outer end of the nail body to form a mesh structure, so that the matching nail can expand the nail body to achieve fixation.

[0013] Further, the tip of the small-diameter end is designed with tricalcium phosphate.

[0014] By the above technical scheme, tricalcium phosphate is designed at the tip of the small-diameter end to mark the position of the tip of the main nail.

[0015] Further, the outer end of each of the first matching nail, the second matching nail and the third matching nail is designed with a thread, and each of the three is installed into the nail body by a rotating extrusion method.

[0016] By the above technical scheme, the outer end of each of the first matching nail, the second matching nail and the third matching nail is designed with a thread, and each of the three is installed into the nail body by a rotating extrusion method. The nail body is expanded while being rotated and extruded to fix the position.

[0017] Further, the matching nail can be designed with 3 to 6 according to the taper size.

[0018] Through the technical scheme, the cooperation nails can be designed as 3 to 6 according to the taper size, and expansion fixation of the nail body at multiple positions can be realized.

[0019] The utility model has the advantages of the following:

[0020] 1. The absorbable intramedullary nail for metacarpal bone provided by the utility model can expand the corresponding position of the nail body at the position where the cooperation nail is installed after the cooperation nail is installed in the nail body, so that fixation is realized. The depth of the first cooperation nail, the second cooperation nail and the third cooperation nail in the main nail can be adjusted to adjust the fixation length of the nail body. Since the main nail and the cooperation nail are made of PLGA material, the PLGA material has good biocompatibility, is non-toxic, has good encapsulation and film formation performance, so that good stability can be provided, and the bone marrow fluid in the metacarpal bone can be absorbed, so that secondary surgery is avoided, the previous two surgeries are changed into one surgery, the pain of secondary invasive treatment is reduced, the treatment cost is reduced, and the defect that the metal intramedullary nail needs secondary surgery and the treatment cost is increased in the current domestic and international treatment scheme is solved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The utility model provides an axonometric drawing of the absorbable intramedullary nail for metacarpal bone;

[0022] Figure 2 The utility model provides a sectional view of the absorbable intramedullary nail for metacarpal bone after combination;

[0023] Figure 3 The utility model provides a sectional view of the main nail of the absorbable intramedullary nail for metacarpal bone;

[0024] Figure 4 The utility model provides a front view of the absorbable intramedullary nail for metacarpal bone.

[0025] LEGEND:

[0026] 1. Main nail; 101, nail body; 102, large diameter end; 103, small diameter end; 104, mesh; 2, cooperation nail; 201, first cooperation nail; 202, second cooperation nail; 203, third cooperation nail. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0028] Referring to Figures 1-4 The utility model provides an embodiment: a metacarpal absorbable intramedullary needle, including main nail 1 and cooperation nail 2, the inside design of main nail 1 is hollow with screw thread structure, main nail 1 is used in pairs with cooperation nail 2, and main nail 1 and cooperation nail 2 all adopt PLGA material to make, and cooperation nail includes first cooperation nail 201, second cooperation nail 202 and third cooperation nail 203, first cooperation nail 201, second cooperation nail 202 and third cooperation nail 203 can be rotated and put into the inside of main nail 1 in proper order, and with main nail 1 can be embedded, after every cooperation nail 2 is rotated and loaded into nail body 101, the position of the loaded cooperation nail 2 will prop open the corresponding position of nail body 101 this part, to realize fixed, however through the depth of first cooperation nail 201, second cooperation nail 202 and third cooperation nail 203 in the inside of main nail 1 can adjust the fixed length of nail body 101, since main nail 1 and cooperation nail 2 all adopt PLGA material to make, and PLGA material has good biocompatibility, non-toxic, good performance of forming capsule and film, to provide good stability, and can absorb the bone marrow fluid in metacarpal, avoid secondary surgery, make previous two operations, change into one operation, to reduce the disease secondary invasive treatment pain, can also reduce the treatment cost simultaneously, solved the current domestic and international treatment scheme existence metal intramedullary needle needs secondary surgery, the defect of the treatment cost increase.

[0029] The main nail 1 includes a nail body 101, a large diameter end 102 and a small diameter end 103, the large diameter end 102 and the small diameter end 103 are designed at both ends of the nail body 101, the nail body 101 is designed as a cone, and the diameter of the large diameter end 102 of the nail body 101 is 3mm and the diameter of the small diameter end 103 is 0.5mm, the main nail 1 includes the nail body 101, the large diameter end 102 and the small diameter end 103, and the large diameter end 102 and the small diameter end 103 are designed at both ends of the nail body 101, and the diameter of the large diameter end 102 is larger than that of the small diameter end 103, the nail body 101 is designed as a cone to facilitate the insertion of the main nail 1, a plurality of mesh holes 104 are provided at the outer end of the nail body 101 to form a mesh structure, a plurality of mesh holes 104 are provided at the outer end of the nail body 101 to form a mesh structure to facilitate the expansion of the nail body 101 to achieve fixation, the tip of the small diameter end 103 is designed with tricalcium phosphate, the tip of the small diameter end 103 is designed with tricalcium phosphate to mark the position of the tip of the main nail 1, the outer ends of the first cooperating nail 201, the second cooperating nail 202 and the third cooperating nail 203 are designed with threads, and the three are installed in the nail body 101 by rotating and extruding, the outer ends of the first cooperating nail 201, the second cooperating nail 202 and the third cooperating nail 203 are designed with threads, and the three are installed in the nail body 101 by rotating and extruding, and at the same time, the nail body 101 is expanded to fix the position, the cooperating nail 2 can be customized to design 3 to 6 according to the taper size, the cooperating nail 2 can be customized to design 3 to 6 according to the taper size, and the expansion and fixation of the nail body 101 at multiple positions can be achieved.

[0030] Working principle: after each cooperating nail 2 is rotated and installed in the nail body 101, the position corresponding to the installed cooperating nail will expand the part of the nail body 101, thereby achieving fixation, however, by adjusting the depth of the first cooperating nail 201, the second cooperating nail 202 and the third cooperating nail 203 in the main nail 1, the fixed length of the nail body 101 can be adjusted, since the main nail 1 and the cooperating nail 2 are made of PLGA material, which has good biocompatibility, non-toxicity, good capsule and film forming properties, thereby providing good stability, and can absorb bone marrow fluid in the metacarpal bone, avoiding secondary removal surgery, changing the previous two surgeries into one surgery, thereby reducing the pain of secondary invasive treatment of diseases, and also reducing treatment costs, solving the defects of the current domestic and international treatment scheme that metal intramedullary needles need secondary removal surgery and treatment costs increase.

[0031] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, the made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A metacarpal absorbable intramedullary nail, comprising a main nail and a matching nail, characterized in that: The main nail is designed with a hollow, threaded structure. The main nail and the mating nail are used in pairs. Both the main nail and the mating nail are made of PLGA material. The mating nail includes a first mating nail, a second mating nail, and a third mating nail. The first mating nail, the second mating nail, and the third mating nail can be rotated into the interior of the main nail in sequence and can be fitted with the main nail.

2. The absorbable intramedullary nail for metacarpals according to claim 1, characterized in that: The main nail includes a nail body, a large-diameter end, and a small-diameter end. The large-diameter end and the small-diameter end are respectively designed at both ends of the nail body. The nail body is designed in a conical shape, and the diameter of the large-diameter end of the nail body is 3mm and the diameter of the small-diameter end is 0.5mm.

3. The absorbable intramedullary nail for metacarpal bones according to claim 2, characterized in that: The outer end of the nail body has multiple mesh holes to form a mesh structure.

4. The absorbable intramedullary nail for metacarpal bones according to claim 2, characterized in that: The tip of the small-diameter end is designed with tricalcium phosphate.

5. The absorbable intramedullary nail for metacarpal bones according to claim 2, characterized in that: The outer ends of the first mating pin, the second mating pin, and the third mating pin are all designed with threads, and all three are inserted into the pin body by rotation and compression.

6. The absorbable intramedullary nail for metacarpal bones according to claim 1, characterized in that: The number of mating pins can be customized to 3 to 6 according to the taper size.

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