Microblister skin grafting
The present invention generally relates to devices for harvesting a skin graft(s). The present invention provides a blister raising device integrated with a member for cutting the blister.
1. A device for obtaining a skin graft, the device comprising:
a harvester configured for placement on a target region of a patient's skin, the harvester being configured to form a sealing engagement with a head that provides negative pressure to the target region such that the target region of skin is embraced within an evacuated chamber, the harvester further comprising:
at least one alignment plate having a plurality of holes through which skin blisters can be raised in presence of the negative pressure, the at least one alignment plate comprising a top alignment plate and a bottom alignment plate; and
a cutting plate disposed between the top and bottom alignment plates, the cutting plate having at least one cutting surface configured to cleave the skin blisters after they are formed within the chamber;
wherein the top plate, the bottom plate, and the cutting plate each comprises a plurality of holes that are configured to be concentrically aligned to facilitate formation of the skin blisters.
2. The device according to claim 1 , wherein the top and bottom alignment plates are joined together by a plurality of vertical posts that pass through slots in the cutting plate to maintain fixed position of the top and bottom plates relative to each other while permitting movement of the cutting plate.
3. The device according to claim 1 , wherein the top plate comprises a radiation absorbing material.
4. The device according to claim 1 , wherein the top plate comprises at least one fluoropolymer surface.
5. The device according to claim 1 , wherein the holes of the top plate are larger than the holes of the bottom plate.
6. The device according to claim 1 , wherein the plurality of holes in the cutting plate are suitable for concentric alignment with the plurality of holes in the at least one alignment plate in a first position and wherein the cutting plate further comprises a plurality of cutting surfaces suitable for cleaving blisters in a second position.
7. The device according to claim 6 , wherein the device further comprises an actuator for moving the cutting plate from the first position to the second position.
8. The device according to claim 7 , wherein the actuator is configured to also at least partially retract the cutting plate following cleavage of the skin blisters.
9. The device according to claim 7 , wherein the actuator is configured to move the cutting plate from the second position to the first position following cleavage of the skin blisters.
10. The device according to claim 7 , wherein the cutting plate and the at least one alignment plate are coupled in the first position to prevent relative movement thereof, and wherein actuation of the actuator is configured to decouple the cutting plate and the alignment plate.
11. The device according to claim 10 , wherein the cutting plate and the at least one alignment plate are frangibly coupled via one or more spot welds that are configured to break upon actuation of the actuator.
12. The device according to claim 7 , wherein rotation of the actuator moves the cutting plate laterally from the first position to the second position.
13. The device according to claim 12 , further comprising a sled coupled to the cutting plate, and wherein the actuator comprises a handle and an axle, the axle having a first protrusion extending therefrom for engaging a first mating feature on the sled so as to move the cutting plate from the first position to the second position during a first portion of the rotation of the actuator.
14. The device according to claim 13 , wherein a second protrusion extending from the axle engages a second mating feature on the sled so as to move the cutting plate from the second position to the first position during a second portion of the rotation of the actuator.
15. The device according to claim 12 , wherein a single stroke of the actuator moves the cutting plate from the first position to the second position so as to cleave the skin blisters and from the second position to the first position to at least partially retract the cutting plate.
16. The device according to claim 6 , wherein each of the cutting surfaces is associated with one of the holes of the cutting plate.
17. The device according to claim 1 , wherein the head further comprises a sealing surface configured to engage with a mating surface on the harvester such that, when the head is engaged with the harvester on a patient's skin, the evacuated chamber is formed over the target region of the skin.
18. The device according to claim 1 , wherein the head further comprises at least one temperature measuring element for measuring the temperature of the skin or the evacuated chamber.