Nail holder

Abstract

The utility model discloses a nail holder which comprises a handle, a core shaft, a sleeve and a locking assembly and is characterized in that one end of the core shaft is in driving connection with the handle, the other end of the core shaft is used for clamping a part to be held, the sleeve is sleeved outside the core shaft in an axial sliding and matching mode, and the locking assembly is used for locking the sleeve. The mandrel comprises a body connected with the handle and a fixing portion used for fixing the to-be-held component, one end of the fixing portion is fixedly connected with the body, a plurality of notches are formed in the end, away from the handle, of the mandrel in the radial direction, and the notches extend in the axial direction and cut the fixing portion into a plurality of elastic pieces. The locking assembly is arranged between the sleeve and the core shaft, so that when the sleeve axially moves relative to the core shaft, the fixing part can lock or disassemble the to-be-held component. The nail holder disclosed by the utility model can be used for clamping bone nails with different sizes.

Description

Technical Field

[0001] The utility model belongs to the field of medical instruments, and in particular relates to a nail holder. Background Art

[0002] In clinical surgery, bone screws are a common orthopedic implant, which is used to fix damaged bone tissue or other orthopedic internal fixation structures such as steel plates during surgery. The process of screwing the bone screw into the bone plate requires the use of a screw holder to clamp the bone screw. The screw holder is a very important tool in orthopedic implant surgery. Its main functions are: 1) to stably hold the bone screw so that the surgeon can safely and accurately place the bone screw to the part that needs to be fixed or inserted; 2) to maintain alignment with the axis of the bone screw throughout the operation and control the direction of the bone screw; 3) to effectively drive the bone screw in.

[0003] At present, the most widely used nail holders are clamping type or outer sleeve type. The nail holders used in these two types of holding methods have certain limitations, which brings many inconveniences to the operation. Among them, the clamping type nail holder is difficult to provide the holding force for the bone screw, especially in the axial alignment, and is very unstable during the operation, and the bone screw is easy to fall off during use; the outer sleeve type nail holder involves more parts, which makes the nail holder too cumbersome and bloated, obstructing the operator's field of vision when making a small surgical incision or holding a small bone screw, and inconvenient for the operator to operate. Therefore, in view of the shortcomings of the previous technology, patent CN215192160U proposes a reusable nail holder with stable connection strength, which can be locked and disassembled with one key when used with bone screws, and can automatically align the bone screw with the center of the nail holder, so that there will be no misoperation, easy to operate, and time-saving. However, the nail holder disclosed in the patent also has some problems. For example, since the bone screws have various sizes, it is necessary to match nail holders of different sizes in clinical operations, which increases the instruments and tools and complexity of surgical operations.

[0004] Therefore, proposing a screw holder that can be used with bone screws of different sizes is a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The utility model provides a nail holder which can be suitable for bone nails of different sizes, thus avoiding unnecessary waste of medical resources when bone nails of different sizes need to be matched with nail holders of different specifications.

[0006] In order to solve the above technical problems, the technical solution provided by the utility model is: a nail holder, comprising: a handle, a core shaft, a sleeve and a locking assembly, characterized in that one end of the core shaft is drivingly connected to the handle, and the other end is used to clamp the part to be held, and the sleeve can be axially slidably matched and sleeved on the outside of the core shaft, the core shaft comprises a main body connected to the handle and a fixing part for fixing the part to be held, one end of the fixing part is fixedly connected to the main body, and a plurality of incisions are radially opened at one end of the core shaft away from the handle, the incisions extend axially and cut the fixing part into a plurality of elastic sheets, and the locking assembly is arranged between the sleeve and the core shaft, so that when the sleeve moves axially relative to the core shaft, the fixing part can lock or disassemble the part to be held.

[0007] Furthermore, the core shaft also includes a coaxially arranged frustum of a cone, which is fixedly connected to the fixed portion, and the incision extends radially to cut the frustum of a cone into a plurality of conical slices; the diameter of the frustum of a cone gradually decreases from the frustum of a cone to the handle, and the minimum diameter of the frustum of a cone is the same as the diameter of the fixed portion.

[0008] Furthermore, the locking assembly includes a groove, a baffle and a spring, the groove is coaxially arranged at one end of the sleeve close to the handle, the baffle is arranged outside the core shaft close to one end of the handle, the spring is arranged in the groove, one end is fixedly connected to the baffle, and the other end is against the bottom of the groove, and the spring is in a compressed state.

[0009] Furthermore, the locking assembly includes an external thread arranged in the middle of the outer surface of the core shaft and an internal thread arranged at one end of the sleeve close to the handle, and the external thread matches the internal thread.

[0010] Furthermore, a conical surface adapted to the frustum of the cone is arranged inside the end of the sleeve.

[0011] Furthermore, a clamping claw is provided at one end of the cone piece facing outwards, one end of the clamping claw is fixedly connected to the cone piece, and the other end is bent inwards to form a clamping portion.

[0012] Furthermore, it also includes a countersunk hole, which is coaxially arranged at the end of the core shaft away from the handle, and the countersunk hole extends to below the clamping part.

[0013] Furthermore, the number of the cutouts, the conical pieces and the elastic pieces is four each.

[0014] Furthermore, one end of the component to be held fixed to the clamping portion is provided with a clamping hole matching the clamping portion, and during the axial movement of the sleeve, the clamping portion abuts against the clamping hole.

[0015] Furthermore, the spindle is connected to the handle via a quick-change head; and a force-adding handle is provided outside the sleeve near one end of the handle.

[0016] The beneficial effects of the present invention are as follows: the nail holder provided by the present invention can match bone nails of different sizes, thereby avoiding unnecessary waste of medical resources; in surgeries requiring bone nails of different specifications, the surgery can be performed using a universal nail holder, thereby simplifying surgical instruments and facilitating operation; the elastic sheet is retracted inward to lock the bone nail, and during the locking process the bone nail is automatically adjusted to be coaxial with the sleeve to form automatic correction, thereby saving operation time; the movement of the sleeve continues to retract the elastic sheet, thereby strengthening the fixing effect on the bone nail; the nail holder of the present invention is reusable and has stable connection strength; when used in conjunction with the bone nail, one-touch locking and disassembly can be achieved; the bone nail can be automatically aligned with the center of the nail holder without any misoperation; the structure is simple, the operation is convenient, and it saves time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of the nail holder of the utility model used in conjunction with the component to be held;

[0018] Figure 2 A cross-sectional view of the nail holder of the utility model used in conjunction with a component to be held;

[0019] Figure 3 A top view of the nail holder of the utility model used in conjunction with a component to be held;

[0020] Figure 4 A cross-sectional view of the nail holder of the utility model;

[0021] Figure 5 A schematic diagram of the structure of the mandrel in the nail holder of the utility model;

[0022] Figure 6 The utility model is a cross-sectional view of the core shaft of the nail holder.

[0023] Reference numerals include:

[0024] 100 - mandrel 110 - fixing part 120 - truncated cone

[0025] 130 - clamping part 121 - cone piece 140 - cutout

[0026] 150—Baffle 200—Sleeve 210—Power handle

[0027] 220 - groove 300 - holding component 400 - locking component

[0028] 410—spring 170—counterbore 131—clamping claw

[0029] 500—handle 111—elastic sheet 600—quick-change head

[0030] 160—Ontology DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] like Figure 1 and 2 As shown, the utility model provides a nail holder, including: a handle 500, a sleeve 200, a core shaft 100 and a locking assembly 400, wherein one end of the core shaft 100 is drivingly connected to the handle 500, and the other end is used to clamp the part to be held 300, and the sleeve 200 can be axially slidably matched and sleeved on the outside of the core shaft 100. During installation, the handle 500, the core shaft 100, the sleeve 200 and the part to be held 300 are coaxially arranged. The structure of the core shaft 100 is as shown in FIG. Figure 4 and 5As shown, the mandrel 100 includes a body 160, a fixing portion 110, a truncated cone 120 and a clamping portion 130. The fixing portion 110 and the truncated cone 120 are coaxially arranged in sequence at one end of the body 160 away from the handle 500, and the fixing portion 110 is located between the mandrel 100 body 160 and the truncated cone 120. A plurality of cutouts 140 are radially opened at one end of the mandrel 100 away from the handle 500, and the length direction of the cutout 140 extends along the radial direction of the mandrel 100, and the depth direction of the cutout 140 extends along the axial direction of the mandrel 100. The cutout 140 cuts the truncated cone 120 into a plurality of conical pieces 121 in the depth direction. The cutout 140 divides the fixing part 110 into a plurality of elastic sheets 111 in the length direction. One end of the elastic sheet 111 is fixedly connected to the body 160 of the mandrel 100. The elastic sheet 111 can be freely retracted toward the inner diameter to drive the retraction of the conical sheet 121 to clamp the part to be held 300, thereby enhancing the locking effect of the part to be held 300. The locking assembly 400 is arranged between the sleeve 200 and the mandrel 100. The diameter of the truncated cone 120 gradually decreases from the truncated cone 120 to the handle 500, and the minimum diameter of the truncated cone 120 is the same as the diameter of the fixing part 110 (that is, the diameters of the transitional connection between the two are the same). Therefore, it can be ensured that the sleeve 200 can slide back and forth between the outside of the fixing part 110 and the outside of the truncated cone 120, so that the fixing part 110 and the truncated cone 120 can lock or disassemble the part to be held 300.

[0036] like Figure 4 As shown, the locking assembly 400 includes a groove 220, a baffle 150 and a spring 410. The groove 220 is coaxially arranged at one end of the sleeve 200 close to the handle 500, and the length direction of the groove 220 extends along the axis of the mandrel 100. The baffle 150 is arranged outside the mandrel 100 close to one end of the handle 500. The baffle 150 is annular and fixedly arranged outside the mandrel 100. The length direction of the spring 410 extends along the axis of the mandrel 100. The spring 410 is arranged in the groove 220, one end of the spring 410 is fixedly connected to the baffle 150, and the other end abuts against the bottom of the groove 220 (far away from the handle 500 end). When the nail holder is locking or disassembling the component 300 to be held, the spring 410 is in a compressed state.

[0037] In order to enhance the locking effect of the holding component 300, as Figure 3 As shown, a clamping claw 131 is provided at one end of the cone piece 121 facing outward, one end of the clamping claw 131 is fixedly connected to the cone piece 121, and the other end is bent inwardly to form a clamping portion 130. In order to prevent the clamping claw 131 and the component to be held 300 from slipping, a clamping hole matching the clamping portion 130 is provided at one end of the component to be held 300 fixed to the clamping portion 130, and during the axial movement of the sleeve 200, the clamping portion 130 abuts against the clamping hole to clamp and fix the component to be held 300.

[0038] like Figure 6 As shown, the nail holder further includes a countersunk hole 170, which is coaxially arranged at the end of the mandrel 100 away from the handle 500, and the countersunk hole 170 passes through the clamping portion 130 and the truncated cone 120, and extends to the bottom of the clamping portion 130. The countersunk hole 170 leaves enough shrinkage space for the elastic sheet 111 to be suitable for clamping parts 300 of different sizes.

[0039] Preferably, the number of the cutout 140, the conical sheet 121 and the elastic sheet 111 are all 4. A conical surface adapted to the truncated cone 120 is arranged at the end of the sleeve 200. The mandrel 100 is connected to the handle 500 through the quick-change head 600, and a force-adding handle 210 is arranged outside the sleeve 200 near one end of the handle 500.

[0040] When the parts to be held 300 (bone screws) of different sizes are installed on the frustum 120, the opening angles of the conical pieces 121 of the frustum 120 will be different, and the diameter of the frustum 120 will change. The sleeve 200 of the nail holder of the utility model can move axially outside the frustum 120 and the fixing part 110, and can, under the action of the spring 410 in a compressed state, retract and fix the frustum 120 and the fixing part 110, thereby fixing the part to be held 300.

[0041] The utility model also provides another embodiment, which is substantially the same as the above embodiment, except that the locking assembly 400 of the present embodiment includes an external thread provided in the middle of the outer surface of the mandrel 100 and an internal thread provided at one end of the sleeve 200 close to the handle 500, and the external thread matches the internal thread to prevent the sleeve 200 from further axially moving relative to the mandrel 100 when the fixing portion 110 and the truncated cone 120 lock the component to be held 300. The present embodiment can also achieve the function of locking components 300 of different sizes.

[0042] When in use, the bone screw is first placed in the truncated cone 120 formed by the conical piece 121. Due to the tension of the conical piece 121 and the elastic piece 111, the elastic piece 111 and the conical piece 121 expand radially outward after the bone screw is inserted. Then the sleeve 200 is moved upward or rotated around the axis of the sleeve. At this time, the conical surface and the truncated cone 120 gradually contact and abut against each other, and the elastic piece 111 and the conical piece 121 are retracted inward to lock the bone screw and limit the circumferential direction at the same time until the truncated cone 120 cannot move upward, thereby forming automatic correction and fixation.

[0043] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scopes based on the ideas of the present invention. As long as these changes do not deviate from the concept of the present invention, they all belong to the protection scope of the present invention.

Claims

1. A nail holder, comprising a handle (500), a mandrel (100), a sleeve (200) and a locking assembly (400), characterized in that: One end of the mandrel (100) is drivingly connected to the handle, and the other end is used to clamp the component to be held (300). The sleeve (200) can be axially slidably sleeved on the outside of the mandrel (100). The mandrel (100) includes a body (160) connected to the handle (500) and a fixing part (110) for fixing the component to be held (300). One end of the fixing part (110) is fixedly connected to the body (160). The mandrel (100) is away from the A plurality of cutouts (140) are radially formed at one end of the handle (500), and the cutouts (140) extend axially and divide the fixing portion (110) into a plurality of elastic sheets (111). The locking assembly (400) is arranged between the sleeve (200) and the core shaft (100), so that when the sleeve (200) moves axially relative to the core shaft (100), the fixing portion (110) can lock or disassemble the component to be held (300).

2. The nail holder according to claim 1, characterized in that: The core shaft (100) also includes a coaxially arranged frustum (120), the frustum (120) is fixedly connected to the fixing portion (110), and the cutout (140) extends radially to cut the frustum (120) into a plurality of conical slices (121); the diameter of the frustum (120) gradually decreases from the frustum (120) to the handle (500), and the minimum diameter of the frustum (120) is the same as the diameter of the fixing portion (110).

3. The nail holder according to claim 2, characterized in that: The locking assembly (400) comprises a groove (220), a blocking piece (150) and a spring (410); the groove (220) is coaxially arranged at one end of the sleeve (200) close to the handle (500); the blocking piece (150) is arranged outside the core shaft (100) close to one end of the handle (500); the spring (410) is arranged in the groove (220), one end of which is fixedly connected to the blocking piece (150) and the other end of which is against the bottom of the groove (220); the spring (410) is in a compressed state.

4. The nail holder according to claim 3, characterized in that: The locking assembly (400) comprises an external thread arranged in the middle of the outer surface of the core shaft (100) and an internal thread arranged at one end of the sleeve (200) close to the handle (500), and the external thread matches the internal thread.

5. The nail holder according to claim 3 or 4, characterized in that: A conical surface adapted to the truncated cone (120) is arranged inside the end of the sleeve (200).

6. The nail holder according to claim 5, characterized in that: The outward end of the conical piece (121) is provided with a clamping claw (131), one end of the clamping claw (131) is fixedly connected to the conical piece (121), and the other end is bent inwardly to form a clamping portion (130).

7. The nail holder according to claim 6, characterized in that: It also includes a countersunk hole (170) which is coaxially arranged at one end of the core shaft (100) away from the handle (500), and the countersunk hole (170) extends to below the clamping portion (130).

8. The nail holder according to claim 7, characterized in that: The number of the cutouts (140), the number of the conical pieces (121) and the number of the elastic pieces are all four.

9. The nail holder according to claim 8, characterized in that: One end of the component to be held (300) fixed to the clamping portion (130) is provided with a clamping hole matching the clamping portion (130), and during the axial movement of the sleeve (200), the clamping portion (130) abuts against the clamping hole.

10. The nail holder according to claim 9, characterized in that: The core shaft (100) is connected to the handle (500) via a quick-change head (600); and a force-adding handle (210) is provided outside the sleeve (200) at one end close to the handle (500).

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